{"id":257,"date":"2025-04-02T08:42:50","date_gmt":"2025-04-02T08:42:50","guid":{"rendered":"https:\/\/photonics.ws.hosei.ac.jp\/wp\/?page_id=257"},"modified":"2026-04-13T02:15:41","modified_gmt":"2026-04-13T02:15:41","slug":"%e7%a0%94%e7%a9%b6%e6%a5%ad%e7%b8%be-%e5%9b%bd%e9%9a%9b%e4%bc%9a%e8%ad%b0","status":"publish","type":"page","link":"https:\/\/photonics.ws.hosei.ac.jp\/wp\/?page_id=257","title":{"rendered":"\u7814\u7a76\u696d\u7e3e \u56fd\u969b\u4f1a\u8b70"},"content":{"rendered":"\n
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  1. T. Fujisawa<\/strong>, T. Mitarai, Y. Sawada, T. Okimoto, T. Hiratani, K. Komatsu, H. Yagi, and N. Fujiwara, \u201cUltrasmall SCL-band Wavelength Multiplexers Using Mosaic-Based Digital Metamaterial,\u201d Optical Fiber Communication Conference (OFC), Paper Tu2J.4, Los Angeles, USA, 2025.<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n\n\n
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    1. H. Nakano, T. Yanagimoto, K. Kunitake, R. Takashima, T. Fujisawa<\/u><\/strong>, K. Maeda, and M. Arai, \u201cBroadband Luminescence from InGaAs\/GaAsSb type-II quantum well on GaAs substrate for optical sensing applications,\u201d Compound Semiconductor Week (CSW2025), B3-5, Banff, Canada, May 26 to 30, 2025.<\/li>\n\n\n\n
    2. T. Fujisawa<\/u><\/strong>, and Y. Tsuji, \u201cBroadband asymmetric directional coupler based on SiN waveguide designed by adjoint method,\u201d Optoelectronics and Communications Conference (OECC 2025), Paper TuH3-2, Sapporo, Japan, June 29 to July 3, 2025.<\/li>\n\n\n\n
    3. M. Taniguchi, T. Matsuzaki, A. Iguchi, T. Tsuji, and T. Fujisawa<\/u><\/strong>, \u201cStudy on efficient propagation analysis for photonic device optimization utilizing structural symmetry,\u201d Optoelectronics and Communications Conference (OECC 2025), Paper TuH3-3, Sapporo, Japan, June 29 to July 3, 2025.<\/li>\n\n\n\n
    4. T. Mitarai, T. Fujisawa<\/u><\/strong>, Y. Sawada, T. Okimoto, Y. Koyama, H. Yagi, and N. Fujiwara \u201cPolarization beam splitters with compact mode demultiplexer using mosaic-based structure,\u201d Optoelectronics and Communications Conference (OECC 2025), Paper WE1-1, Sapporo, Japan, June 29 to July 3, 2025.<\/li>\n\n\n\n
    5. T. Fujisawa<\/u><\/strong>, Y. Tsuji, T. Mitarai, Y. Sawada, T. Okimoto, T. Hiratani, K. Komatsu, H. Yagi, and N. Fujiwara, \u201cUltrasmall mode exchangers based on mosaic structure designed by gradient direct binary search method,\u201d 51th European Conference and Exhibition on Optical Communication (ECOC 2025), Paper W.02.01.28, Kopenhagen, Denmark, Sept. 2025.<\/li>\n\n\n\n
    6. T. Hiratani, K. Komatsu, H. Fujikata, N. Fujiwara, N. Inoue, T. Kikuchi, T. Mitarai, S. Kimura, T. Okimoto, Y. Sawada, E. Bannno, T. Matsui, T. Fujisawa<\/u><\/strong>, N. Nishiyama, and H. Yagi, \u201cScalable multi-band narrow linewidth operation by a single-chip tunable laser with InP\/Si heterogeneous integration,\u201d 51th European Conference and Exhibition on Optical Communication (ECOC 2025), Paper W.03.02.2, Kopenhagen, Denmark, Sept. 2025.<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n\n\n

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      2024<\/span>
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      1. K. Maeda, T. Fujisawa<\/u><\/strong>, and M. Arai, \u201cExcitation intensity dependence of photoluminescence in mid-infrared region for lattice-matched InAs\/GaAsSb superlattice grown by MOVPE method,\u201d 10th international conference on optical, optoelectronic and photonic materials and applications (ICOOPMA2024), P18, Czech Republic, June 2024.<\/li>\n\n\n\n
      2. Y. Sawada, T. Fujisawa<\/u><\/strong>, T. Mitarai, T. Okimoto, H. Yagi, and N. Fujiwara \u201cCompact four-channel wavelength multiplexer with two-stage mosaic-based waveguides designed by Bayesian direct binary search,\u201d Optoelectronics and Communications Conference (OECC 2024), Paper TB4.1, Melbourne, Australia, June 30 to July 4, 2024.<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n\n\n

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        2023\u4ee5\u524d<\/span>
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        1. T. Fujisawa<\/u><\/strong> and M. Koshiba, \u201cFull-vector finite-element beam propagation method for three-dimensional nonlinear optical waveguides,\u201d Topical Meeting on Integrated Photonics Research, IThH2, Vancouver, Canada, 2002.<\/li>\n\n\n\n
        2. T. Fujisawa<\/u><\/strong> and M. Koshiba, \u201cTime-domain beam propagation method for nonlinear optical propagation analysis and its application to photonic crystal circuits,\u201d Topical Meeting on Integrated Photonics Research, IME5, Washington, USA, 2003.<\/li>\n\n\n\n
        3. T. Fujisawa<\/u><\/strong> and M. Koshiba, \u201cFinite-element method for nonlinear periodic optical waveguides and its application to photonic crystal circuits,\u201d Topical Meeting on Integrated Photonics Research, IFE3, Sanfrancisco, USA, 2004.<\/li>\n\n\n\n
        4. T. Fujisawa<\/u><\/strong> and M. Koshiba, \u201cFinite-element characterization of nonlinear modal properties of photonic crystal waveguides,\u201d 9th OptoElectronics and Communications Conference and 3th International Conference on Optical Internet (OECC\/COIN 2004), 14F4-3, Yokohama, Japan, 2004.<\/li>\n\n\n\n
        5. T. Fujisawa<\/u><\/strong> and M. Koshiba, \u201cAn analysis of photonic crystal waveguide gratings using coupled-mode theory and finite-element method,\u201d Topical Meeting on Integrated Photonics Research, ITuB4, San Diego,\u3000USA, 2005.<\/li>\n\n\n\n
        6. T Fujisawa<\/u><\/strong> and M. Koshiba, \u201cAn analysis of air-hole type photonic crystal waveguide gratings using coupled-mode theory and finite-element method,\u201d International Conference on Quantum Electronics 2005 and the Pacific Rim Conference on Lasers and Electro-Optics 2005 (IQEC\/CLEO-PR 2005), CTuE3-3, Tokyo, Japan, July 2005.<\/li>\n\n\n\n
        7. S.K. Varshney, K. Saitoh, T. Fujisawa<\/u><\/strong>, and M. Koshiba, \u201cDesign of gain-flattened highly nonlinear photonic crystal fiber Raman amplifier using a single pump: a leakage loss approach,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), OWD4, Anaheim, USA, Mar. 2006.<\/li>\n\n\n\n
        8. T. Fujisawa<\/u><\/strong>, M. Arai, T. Yamanaka, Y. Kondo, and H. Yasaka, \u201cThe Impact of InAlGaAs barriers on material and differential gain of quantum wells on low indium content InGaAs ternary substrates,\u201d Twelfth Optoelectronics and Communications Conference\/16th International Conference on Integrated Optics and Optical Fiber Communication (OECC\/IOOC2007), 13D1-4, Yokohama, Japan, July 2007.<\/li>\n\n\n\n
        9. M. Arai, T. Fujisawa<\/u><\/strong>, W. Kobayashi, Y. Kawaguchi, M. Yuda, T. Tadokoro, K. Kinoshita, T. Ueda, S. Yoda, and Y. Kondo, “A 1.31 mm ridge waveguide laser for 10 Gbps direct modulation on an InGaAs ternary substrate,” 20th Indium Phosphide and Related Materials Conference (IPRM 2008), ThA2.3, Versailles, France, 2008.<\/li>\n\n\n\n
        10. T. Fujisawa<\/u><\/strong>, T. Sato, M. Mitsuhara, T. Kakitsuka, T. Yamanaka, Y. Kondo, and F. Kano, “Successful application of the 8-band k\u2219p<\/em><\/strong> framework to optical properties of highly strained In(Ga)As\/InGaAs quantum wells with strong conduction-valence band coupling,” 8th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD ’08), ThA5, Nottingham, United Kingdom, Sep. 2008.<\/li>\n\n\n\n
        11. M. Arai, T. Fujisawa<\/u><\/strong>, W. Kobayashi, K. Nakashima, M. Yuda, and Y. Kondo, ” High temperature operation of 1.26 mm ridge waveguide laser with InGaAs metamorphic buffer on GaAs substrate,” 2008 International Semiconductor Laser Conference (ISLC 2008), TuB4, Sorrento, Italy, 2008.<\/li>\n\n\n\n
        12. W. Kobayashi, M. Arai, T. Yamanaka, N. Fujiwara, T. Fujisawa<\/u><\/strong>, M. Ishikawa, K. Tsuzuki, Y. Shibata, Y. Kondo, and F. Kano, \u201cExtended operating temperature range of 125\u00b0C (-25\u00b0C to 100\u00b0C) of 10-Gbit\/s, 1.55-mm electroabsorption modulator integrated DFB laser for 80-km SMF transmission,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), OThT4, San Diego, USA, 2009.<\/li>\n\n\n\n
        13. M. Arai, T. Tadokoro, W. Kobayashi, T. Fujisawa<\/u><\/strong>, K. Nakashima, M. Yuda, and Y. Kondo, “Uncooled (25-85\u00b0C) operation of 1.3-mm-range metamorphic InGaAs laser on GaAs substrates,” 21th Indium Phosphide and Related Materials Conference (IPRM 2009), WB1.5, Newport Beach, USA, 2009.<\/li>\n\n\n\n
        14. W. Kobayashi, M. Arai, N. Fujiwara, T. Fujisawa<\/u><\/strong>, K. Tsuzuki, T. Ito, Y. Kondo, and F. Kano, \u201c40 Gbit\/s uncooled (-15\u00b0C to 80\u00b0C) operation of a 1.55-mm, InGaAlAs, electroabsorption modulated laser for very short reach applications,\u201d 21th Indium Phosphide and Related Materials Conference (IPRM 2009), ThB1.2, Newport Beach, USA, 2009.<\/li>\n\n\n\n
        15. T. Fujisawa<\/u><\/strong>, M. Arai, N. Fujiwara, W. Kobayashi, T. Tadokoro, K. Tsuzuki, Y. Akage, R. Iga, T. Yamanaka, and F. Kano, \u201cFirst 40-km SMF transmission for 100-Gbit\/s Ethernet system based on 25-Gbit\/s 1.3-mm electroabsorption modulator integrated with a DFB laser module,\u201d 35th European Conference and Exhibition on Optical Communication (ECOC 2009), 8.6.4, Vienna, Austria, 2009.<\/li>\n\n\n\n
        16. T. Fujisawa<\/u><\/strong>, T. Yamanaka, T. Tadokoro, N. Fujiwara, M. Arai, W. Kobayashi, Y. Kawaguchi, K. Tsuzuki, and F. Kano, \u201cIncident-power-dependent extinction ratio of electroabsorption modulator integrated with DFB lasers: Theory and experiment,\u201d 2010 Conference on Lasers and Electro-Optics\/Quantum Electronics and Laser Science Conference (CLEO\/QELS 2010), CWG1, San Jose, USA, 2010.<\/li>\n\n\n\n
        17. (Invited talk) W. Kobayashi, M. Arai, N. Fujiwara, T. Fujisawa<\/u><\/strong>, T. Tadokoro, K. Tsuzuki, T. Yamanaka, and F. Kano, \u201cWide temperature range operation of 10-\/40-Gbps 1.55-mm electroabsorption modulator integrated with DFB laser,\u201d 15th Optoelectronics and Communications Conference (OECC2010), 9D3-1, Sapporo, Japan, 2010.<\/li>\n\n\n\n
        18. T. Fujisawa<\/u><\/strong>, S. Kanazawa, K. Takahata, Y. Kawaguchi, W. Kobayashi, N. Fujiwara, T. Tadokoro, T. Yamanaka, and F. Kano, \u201c4\u00d725-Gbit\/s, 40-km SMF transmission based on 1.3-mm electroabsorption modulators integrated with DFB lasers for 100-Gbit\/s Ethernet,\u201d 15th Optoelectronics and Communications Conference (OECC2010), 6D1-2, Sapporo, Japan, 2010.<\/li>\n\n\n\n
        19. (Invited talk) T. Fujisawa<\/u><\/strong>, S. Kanazawa, N. Nunoya, H. Ishii, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, and H. Oohashi, \u201c4\u00d725-Gbit\/s, 1.3-mm, monolithically integrated light source for 100-Gbit\/s Ethernet,\u201d 36th European Conference and Exhibition on Optical Communication (ECOC 2010), Th.9.D.1, Turin, Italy, 2010.<\/li>\n\n\n\n
        20. W. Kobayashi, K. Tsuzuki, T. Tadokoro, T. Fujisawa<\/u><\/strong>, N. Fujiwara, T. Yamanaka, and F. Kano, \u201cLarge bandwidth TO-CAN module with LCP based transmission line as serial 40 Gb\/s 1.3\/1.55-mm light source,\u201d 2010 International Semiconductor Laser Conference (ISLC 2010), WA4, Kyoto, Japan, 2010.<\/li>\n\n\n\n
        21. S. Kanazawa, T. Fujisawa<\/u><\/strong>, A. Ohki, H. Ishii, N. Nunoya, Y. Kawaguchi, N. Fujiwara, K. Takahata, R. Iga, F. Kano, and H. Oohashi, \u201cLow-voltage operation of 100-Gbit\/s EADFB laser array module,\u201d 2010 International Semiconductor Laser Conference (ISLC 2010), TuC2, Kyoto, Japan, 2010.<\/li>\n\n\n\n
        22. (Invited talk) T. Tadokoro, W. Kobayashi, T. Fujisawa<\/u><\/strong>, T. Yamanaka, and F. Kano, \u201cHigh-speed modulation lasers for 100GbE applications,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), OWD1, Los Angeles, USA, 2011.<\/li>\n\n\n\n
        23. W. Kobayashi, T. Tadokoro, T. Fujisawa<\/u><\/strong>, N. Fujiwara, T. Yamanaka, and F. Kano, \u201c40-Gbps Direct Modulation of 1.3-\u03bcm InGaAlAs DFB Laser in Compact TO-CAN Package,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), OWD2, Los Angeles, USA, 2011.
          <\/li>\n\n\n\n
        24. T. Fujisawa<\/u><\/strong>, K. Takahata, W. Kobayashi, T. Tadokoro, N. Fujiwara, S. Kanazawa, and F. Kano, \u201c1.3-mm, 50-Gbit\/s EADFB lasers for 400GbE,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), OWD4, Los Angeles, USA, 2011.<\/li>\n\n\n\n
        25. (Invited talk) T. Fujisawa<\/u><\/strong>, S. Kanazawa, H. Ishii, N. Nunoya, Y. Kawaguchi, A. Ohki, N. Fujiwara, K. Takahata, R. Iga, F. Kano, and H. Oohashi, \u201cMonolithically integrated transmitter for 100GbE,\u201d 16th Optoelectronics and Communications Conference (OECC2011), 7D1-1, Kaohsiung, Taiwan, 2011.<\/li>\n\n\n\n
        26. T. Fujisawa<\/u><\/strong>, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, H. Ishii, and F. Kano, \u201cLarge-output-power, ultralow-driving-voltage (0.5 Vpp<\/sub>) operation of 1.3-mm, 4\u00d725G, EADFB laser array for driverless 100GbE transmitter,\u201d 37th European Conference and Exhibition on Optical Communication (ECOC 2011), Mo.1.LeSaleve.1, Geneve, Switzerland, 2011.<\/li>\n\n\n\n
        27. K. Takahata, T. Fujisawa<\/u><\/strong>, S. Kanazawa, and F. Kano, \u201c1.3-mm, 4\u00d725G, EADFB laser array module for compact 100GbE transceivers,\u201d IEEE Photonics 2011 Conference (IPC11), TuD2, Arlington, USA, 2011.<\/li>\n\n\n\n
        28. S. Kanazawa, T. Fujisawa<\/u><\/strong>, N. Nunoya, A. Ohki, K. Takahata, H. Sanjoh, R. Iga, and H. Ishii, \u201cExtremely small-form 100GbE transmitter optical sub-assembly for future inter data center cloud networks,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), PDP5B.8, Los Angeles, USA, 2012.<\/li>\n\n\n\n
        29. T. Fujisawa<\/u><\/strong>, K. Takahata, W. Kobayashi, R. Iga, and H. Ishii, \u201cTheoretical and experimental investigations of laser characteristics of novel rear-grating structure and its application to uncooled light source,\u201d 2012 Conference on Lasers and Electro-Optics\/Quantum Electronics and Laser Science Conference (CLEO\/QELS 2012), CM1A.4, San Jose, USA, 2012.<\/li>\n\n\n\n
        30. (Invited talk) T. Fujisawa<\/u><\/strong>, S. Kanazawa, K. Takahata, W. Kobayashi, T. Tadokoro, R. Iga, and H. Ishii, \u201cUltra-high-speed electroabsorption modulator integrated lasers for 100GbE and beyond,\u201d 17th Optoelectronics and Communications Conference (OECC2012), SC4_1011, Busan, Korea, 2012.<\/li>\n\n\n\n
        31. W. Kobayashi, T. Tadokoro, <\/em>T. Ito, <\/em>T. Fujisawa<\/u><\/strong>, <\/em>T. Yamanaka, Y. Shibata and M. Kohtoku,<\/em> \u201cHigh-Speed Operation at 50 Gb\/s and 60-km SMF Transmission with 1.3-\u03bcm InGaAlAs-based DML,\u201d 2012 International Semiconductor Laser Conference (ISLC 2012), TuB1, Santa Barbara
          , USA, 2012.<\/li>\n\n\n\n
        32. K. Takahata, <\/em>T. Fujisawa<\/u><\/strong>, <\/em>A. Ohki, S. Kanazawa, T. Yamanaka, <\/em>H. Sanjoh, <\/em>R. Iga and H. Ishii,<\/em> \u201cExtremely Compact Transmitter Optical Sub-assembly for Next-generation 10-km 100GbE Transceivers,\u201d 2012 International Semiconductor Laser Conference (ISLC 2012), TuB4, Santa Barbara, USA, 2012.<\/li>\n\n\n\n
        33. T. Fujisawa<\/u><\/strong>, <\/em>S. Kanazawa, K. Takahata, <\/em>A. Ohki, Y. Ueda, R. Iga, H. Sanjoh, T. Yamanaka, <\/em>M. Kohtoku, and H. Ishii,<\/em> \u201cUltracompact, 160-Gbit\/s transmitter optical subassembly based on 40-Gbit\/s\u00d74 monolithically integrated light source,\u201d 38th European Conference and Exhibition on Optical Communication (ECOC 2012), We.1.E.1, Amsterdam, The Netherlands, 2012.<\/li>\n\n\n\n
        34. (Invited talk) W. Kobayashi, T. Fujisawa<\/u><\/strong>, <\/em>T. Itoh, T. Yamanaka, Y. Shibata, T. Tadokoro, and H. Sanjoh,<\/em> \u201cHigh-Speed directly modulated laser for applications of beyond 100GbE,\u201d 25th Indium Phosphide and Related Materials Conference (IPRM 2013), TuD2-1, Kobe, Japan, 2013.
          <\/li>\n\n\n\n
        35. Y Ueda, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, M. Kohtoku, H. Takahashi, and H. Ishii,<\/em> \u201cInP-based compact reflection-type transversal filter,\u201d 25th Indium Phosphide and Related Materials Conference (IPRM 2013), TuD4-3, Kobe, Japan, 2013.<\/li>\n\n\n\n
        36. S. Kanazawa, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, A. Ohki, R. Iga, and H. Ishii,<\/em> \u201cLow crosstalk and high modulation bandwidth 100GbE optical transmitter using flip-chip interconnects,\u201d 25th Indium Phosphide and Related Materials Conference (IPRM 2013), TuD3-2, Kobe, Japan, 2013.<\/li>\n\n\n\n
        37. W. Kobayashi, K. Tsuzuki, T. Fujisawa<\/u><\/strong>, <\/em>Y. Ohiso, Y. Ogiso, T. Itoh, S. Kanazawa, T. Yamanaka, M. Kohtoku, and H. Sanjoh,<\/em> \u201cChallenge in extending operating wavelength range of 30 nm of 25.8-Gb\/s, 1.3-mm, DML,\u201d 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th Optoelectronics and Communications Conference\/Photonics Switching (CLEO-PR&OECC\/PS2013), MK1-1, Kyoto, Japan, 2012.<\/li>\n\n\n\n
        38. T. Fujisawa<\/u><\/strong>, S. Kanazawa, Y. Ueda, W. Kobayashi, K. Takahata, A. Ohki, T. Itoh, M. Kotoku, and H. Ishii, \u201c4\u00d725-Gbit\/s EADFB laser array monolithically integrated with cascaded Mach-Zhender multiplexer,\u201d 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th Optoelectronics and Communications Conference\/Photonics Switching (CLEO-PR&OECC\/PS2013), MK1-3, Kyoto, Japan, 2012.
          <\/li>\n\n\n\n
        39. T. Ohyama, A. Ohki, K. Takahata, T. Itoh, N. Nunoya, T. Fujisawa<\/u><\/strong>, R. Iga, and H. Sanjo, \u201cCompact 100GbE transmitter optical sub-assembly using polarization beam combiner,\u201d 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th Optoelectronics and Communications Conference\/Photonics Switching (CLEO-PR&OECC\/PS2013), MK1-4, Kyoto, Japan, 2012.
          <\/li>\n\n\n\n
        40. Y. Ueda, T. Fujisawa<\/u><\/strong>, S. Kanazawa, W. Kobayashi, K. Takahata, and H. Ishii, \u201cVery-low-voltage operation of Mach-Zhender interferometer-type electroabsorption modulator,\u201d 39th European Conference and Exhibition on Optical Communication (ECOC 2013), We.1.B.2, London, United Kingdom, 2013.
          <\/li>\n\n\n\n
        41. W. Kobayashi, M. Arai, T. Fujisawa<\/u><\/strong>, Y. Shibata, T. Sato, T. Itoh, K. Hasebe, T. Yamanaka, and H. Sanjoh, \u201cChirp and intensity compensation using a 40-Gb\/s short cavity SOA integrated EADFB laser with low power consumption,\u201d 40th European Conference and Exhibition on Optical Communication (ECOC 2014), Mo.4.4.5, Cannes, France, 2014.
          <\/li>\n\n\n\n
        42. Y. Ueda, T. Fujisawa<\/u><\/strong>, S. Kanazawa, W. Kobayashi, K. Takahata, H. Sanjoh, and H. Ishii, \u201cSuccessful demonstration of low-voltage (1 Vpp<\/sub>) MZI-type EAM-integrated DFB laser for 25.8-Gbit\/s 40-km transmission,\u201d 2014 International Semiconductor Laser Conference (ISLC 2014), MD.03, Palma de Mallorca, Spain, 2014.
          <\/li>\n\n\n\n
        43. S. Kanazawa, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, H. Sanjoh, R. Iga, and H. Ishii,<\/em> \u201c8\u00d750-Gb\/s simultaneous operation of EADFB laser array using flip-chip interconnection technique,\u201d 2014 International Semiconductor Laser Conference (ISLC 2014), MD.06, Palma de Mallorca, Spain, 2014.
          <\/li>\n\n\n\n
        44. (Invited talk) S. Kanazawa, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, H. Sanjoh, R. Iga, Y. Ueda, W. Kobayashi, and H. Ishii,<\/em> \u201c400-Gb\/s operation of flip-chip interconnection EADFB laser array module,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), Tu3l.1, Los Angeles, USA, 2015.
          <\/li>\n\n\n\n
        45. T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cMicroscopic analysis of quantum-confined Stark effect of group IV quantum wells for mid-infrared Si-based electroabsorption modulators,\u201d 2015 Conference on Lasers and Electro-Optics\/Quantum Electronics and Laser Science Conference (CLEO\/QELS 2015), Stu4l.6, San Jose, USA, 2015.
          <\/li>\n\n\n\n
        46. S. Makino, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cA high-performance polarization converter based on Silicon modulated taper waveguide for polarization multiplexing designed by wavefront matching method,\u201d 2015 Conference on Lasers and Electro-Optics \u2013 European Quantum Electronics Conference (CLEO-Europe 2015), CK-P.7, Munich, Germany, 2015.
          <\/li>\n\n\n\n
        47. (Invited talk) N. Hanzawa, T. Sakamoto, K. Saitoh, T. Matsui, K. Tsujikawa, T. Fujisawa<\/u><\/strong>, and F. Yamamoto, \u201cMode multi\/demultiplexing with parallel waveguide for mode division multiplexing transmission,\u201d International Symposium on Ultrafast Photonic Technologies\/International Symposium on extremely advanced transmission technology (ISUPT\/EXAT 2015), W2.3, Kyoto, Japan, July 13-15, 2015.
          <\/li>\n\n\n\n
        48. S. Kanazawa, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, R. Iga, H. Ishii and H. Sanjoh,<\/em> \u201cLow-crosstalk operation of 400-Gbit\/s flip-chip interconnection EADFB laser array module,\u201d International Nano-Optoelectronics Workshop (iNow2015), ThP15, Tokyo, 2015.
          <\/li>\n\n\n\n
        49. T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cA principal mode analysis of strongly-coupled 3-core fibres,\u201d 41th European Conference and Exhibition on Optical Communication (ECOC 2015), We.1.4.6, Valencia, Spain, 2015.
          <\/li>\n\n\n\n
        50. N. Hanzawa, K. Saitoh, T. Sakamoto, T. Matsui, K. Tsujikawa, T. Fujisawa<\/u><\/strong>,, Y. Ishizaka, and F. Yamamoto, \u201cDemonstration of PLC-based six-mode multiplexer for mode division multiplexing transmission,\u201d 41th European Conference and Exhibition on Optical Communication (ECOC 2015), P.2.6, Valencia, Spain, 2015.
          <\/li>\n\n\n\n
        51. Y. Tobita, T. Fujisawa<\/u><\/strong>, K. Saitoh, S. Matsuo, and K. Takenaga, \u201cComparison of homogeneous and heterogeneous 2LP-mode multicore fibers for high spatial multiplicity,\u201d Frontiers in Optics\/Laser Science Conference (FiO\/LS 2015), FM1E.2, San Jose, USA, 2015.
          <\/li>\n\n\n\n
        52. T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cImpulse response analysis of strongly-coupled three-core fibers,\u201d Frontiers in Optics\/Laser Science Conference (FiO\/LS 2015), FM1E.3, San Jose, USA, 2015.
          <\/li>\n\n\n\n
        53. S. Makino, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cA high-performance polarization splitter-rotator designed by wavefront matching method,\u201d Frontiers in Optics\/Laser Science Conference (FiO\/LS 2015), FM1F.4, San Jose, USA, 2015.
          <\/li>\n\n\n\n
        54. Y. Yamashita, S. Makino, T. Fujisawa<\/u><\/strong>, K. Saitoh, N. Hanzawa, T. Sakamoto, T. Matsui, K. Tsujikawa, and F. Yamamoto, \u201cBroadband LP01<\/sub>\/LP11<\/sub> PLC-based mode multi\/demultiplexer designed by wavefront matching method,\u201d Frontiers in Optics\/Laser Science Conference (FiO\/LS 2015), FM1F.5, San Jose, USA, 2015.
          <\/li>\n\n\n\n
        55. T. Fujisawa<\/u><\/strong>, R. Tojo, S. Saitoh, S. Matsuo, and K. Saitoh, \u201cExtremely small group delay spread six-core fiber with air-holes for mode-division-multiplexing: A principal mode analysis,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), W2A.30, Anaheim, USA, 2016.
          <\/li>\n\n\n\n
        56. S. Kanazawa, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, Y. Nakanishi, H. Yamazaki, Y. Ueda, W. Kobayashi, Y. Muramoto, H. Ishii, and H. Sanjoh,<\/em> \u201c56-Gbaud 4-PAM (112-Gbit\/s) operation of flip-chip interconnection lumped-electrode EADFB laser module for equalizer-free transmission,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), W4J.1, Anaheim, USA, 2016.
          <\/li>\n\n\n\n
        57. S. Kanazawa, H. Yamazaki, Y. Nakanishi, T. Fujisawa<\/u><\/strong>, <\/em>K. Takahata, Y. Ueda, W. Kobayashi, Y. Muramoto, H. Ishii, and H. Sanjoh,<\/em> \u201cTransmission of 214-Gbit\/s 4-PAM signal using an ultra-broadband lumped-electrode EADFB laser module,\u201d Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC\/NFOEC), Th5B.3, Anaheim, USA, 2016.
          <\/li>\n\n\n\n
        58. Y. Yamashita, Y. Ishizaka, N. Hanzawa, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, F. Yamamoto, K. Nakajima, and K. Saitoh, \u201cExcitation of LP 21b and LP02 modes with PLC-based tapered waveguide for mode-division multiplexing,\u201d 21th Optoelectronics and Communications Conference\/Photonics Switching (OECC\/PS2016), TuE3, Niigata, Japan, 2016.
          <\/li>\n\n\n\n
        59. Y. Chida, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cImpulse response analysis of air-hole added coupled six-core fibers,\u201d 21th Optoelectronics and Communications Conference\/Photonics Switching (OECC\/PS2016), MC2, Niigata, Japan, 2016.
          <\/li>\n\n\n\n
        60. T. Fujisawa<\/u><\/strong>, Y. Amma, S. Matsuo, K. Aikawa, K. Saitoh and M. Koshiba, \u201cA crosstalk analysis of heterogeneous 30-core fibre,\u201d 42th European Conference and Exhibition on Optical Communication (ECOC 2016), Th.2.P2.SC1.7, D\u00fcsseldorf, Germany, 2016.
          <\/li>\n\n\n\n
        61. T. Sato, S. Makino, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cA simple design method of reflection-suppressed photonic crystal cavity with asymmetric waveguides,\u201d 2016 IEEE Photonics Conference (IPC2016), MD1.1, Hawaii, USA, Oct. 2-6, 2016.
          <\/li>\n\n\n\n
        62. S. Makino, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cUltrasmall silicon mode converters designed by wavefront matching method developed for waveguide discontinuity problem,\u201d 2016 IEEE Photonics Conference (IPC2016), TuG3.5, Hawaii, USA, Oct. 2-6, 2016.
          <\/li>\n\n\n\n
        63. Y. Tobita, T. Sakamoto, T. Matsui, S. Saitoh, K. Takenaga, K. Aikawa, T. Fujisawa<\/u><\/strong>, S. Aozasa, K. Nakajima, and K. Saitoh, \u201cOptimum design of 4LP-mode multicore fibers with low differential mode delay for high spatial multiplicity,\u201d 2016 IEEE Photonics Conference (IPC2016), WF2.3, Hawaii, USA, Oct. 2-6, 2016.
          <\/li>\n\n\n\n
        64. Y. Yamashita, S. Makino, T. Fujisawa<\/u><\/strong>, K. Saitoh, N. Hanzawa, T. Sakamoto, T. Matsui, K. Tsujikawa, F. Yamamoto, and K. Nakajima, \u201cA compact and low-loss PLC-based LP11a\/LP11b mode rotator with curved trench structure,\u201d 2016 IEEE Photonics Conference (IPC2016), ThA1.2, Hawaii, USA, Oct. 2-6, 2016.
          <\/li>\n\n\n\n
        65. H. Ishihara, H. Uemura, Y. Sasaki, K. Omichi, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cGrating inscription to few-mode multi-core fiber,\u201d Asia Pacific Optical Sensors Conference, Th4A.13, Shanghai, China, Oct. 11-14, 2016.
          <\/li>\n\n\n\n
        66. T. Fujisawa<\/u><\/strong>, Y. Yamashita, T. Sakamoto, T. Matsui, S. Makino, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cScrambling-type three-mode multiplexer based on cascaded Y-branch waveguide with integrated mode rotator on PLC platform,\u201d Optical Fiber Communication Conference (OFC 2017), Paper W1B.1, Los Angeles, USA, Mar. 19-23, 2017.
          <\/li>\n\n\n\n
        67. T. Fujisawa<\/u><\/strong>, E. Taguchi, T. Sakamoto, T. Matsui, Y. Yamashita, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cOne chip, PLC three-mode exchanger based on symmetric and asymmetric directional couplers with integrated mode rotator,\u201d Optical Fiber Communication Conference (OFC 2017), Paper W1B.2, Los Angeles, USA, Mar. 19-23, 2017.
          <\/li>\n\n\n\n
        68. S. Makino, M. Suga, T. Sato, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cUltimately low-loss and compact Si wire 90\u00b0 waveguide bend composed of clothoid and normal curves for dense optical interconnect PICs,\u201d Optical Fiber Communication Conference (OFC 2017), Paper Th3E.2, Los Angeles, USA, Mar. 19-23, 2017.
          <\/li>\n\n\n\n
        69. T. Sato, M. Akie, M. Arai, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cHighly efficient GeSn electroabsorprtion modulator using higher-order-mode for mid-infrared Ge-on-Si platform,\u201d 2017 Conference on Lasers and Electro-Optics\/Quantum Electronics and Laser Science Conference (CLEO\/QELS 2017), JW2A.110, San Jose, USA, 2017.
          <\/li>\n\n\n\n
        70. (Invited talk) T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cMaterial analysis of GeSn\/SiGeSn quantum wells based on many-body theory,\u201d 2017 IEEE Photonics Society Summer Topicals Meeting Series, TuA1.1, Puerto Rico, USA, 2017.
          <\/li>\n\n\n\n
        71. (Invited talk) K. Saitoh, T. Fujisawa<\/u><\/strong>, and T. Sato, \u201cDesign and analysis of weakly- and strongly-coupled multicore fibers,\u201d Advanced Photonics Congress, NeTu2B.5, New Orleans, USA, 2017.
          <\/li>\n\n\n\n
        72. M. Akie, T. Sato, M. Arai, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cA compact and low-loss GeSn electroabsorprtion modulator using vertical multimode interference for mid-infrared Ge-on-Si platform,\u201d OptoElectronics and Communications Conference (OECC), P3-107, Singapore, July 31-August 4, 2017.
          <\/li>\n\n\n\n
        73. S. Ohta, S. Makino, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cA proposal of Mach-Zehnder mode multi\/demultiplexer for WDM\/MDM optical transmission system,\u201d OptoElectronics and Communications Conference (OECC), P3-131, Singapore, July 31-August 4, 2017.
          <\/li>\n\n\n\n
        74. Y. Sasaki, H. Uemura, S. Nishimoto, K. Takenaga, K. Aikawa, S. Matsuo, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cMulticore fiber-based 5-mode multiplexer\/demultiplexer,\u201d OptoElectronics and Communications Conference (OECC), Paper 1-4B-2, Singapore, July 31-August 4, 2017.
          <\/li>\n\n\n\n
        75. (Invited talk) K. Saitoh, T. Fujisawa<\/u><\/strong>, and T. Sato, \u201cWeakly-coupled and strongly-coupled multicore fibers,\u201d OptoElectronics and Communications Conference (OECC), Paper 2-3B-2, Singapore, July 31-August 4, 2017.
          <\/li>\n\n\n\n
        76. T. Sato, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cHigh-forward-transmission all-optical diode based on cascaded L3 photonic crystal cavities,\u201d The 24th Congress of the International Commission for Optics (ICO-24), Th3E-03, Tokyo, Japan, Aug. 21-25, 2017.
          <\/li>\n\n\n\n
        77. S. Ohta, T. Fujisawa<\/u><\/strong>, S. Makino, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cMach-Zehnder mode\/wavelength (de)multiplexer for WDM\/MDM optical transmission,\u201d 43th European Conference and Exhibition on Optical Communication (ECOC 2017), W.2.C.4, Gothenburg, Sweden, 2017.
          <\/li>\n\n\n\n
        78. K. Yoshida, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cGroup delay spread analysis of few-mode, coupled 3-core fibres: Optimum index profile and maximum transmission distance for strong coupling regime,\u201d 43th European Conference and Exhibition on Optical Communication (ECOC 2017), P1.SC1.8, Gothenburg, Sweden, 2017.
          <\/li>\n\n\n\n
        79. Y. Sawada, S. Makino, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cDevelopment of fully three-dimensional wavefront matching method and its application to the design of ultrasmall Si mode converters,\u201d IEEE Photonics Conference (IPC 2017), Paper WG1.1, Lake Buena Vista, USA, Oct. 1-5, 2017.
          <\/li>\n\n\n\n
        80. M. Kudo, S. Ohta, E. Taguchi, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cA Mach-Zehnder mode multi\/demultiplexer based on Si\/Silica hybrid PLC platform for WDM\/MDM transmission,\u201d IEEE Photonics Conference (IPC 2017), Paper ThF1.3, Lake Buena Vista, USA, Oct. 1-5, 2017.
          <\/li>\n\n\n\n
        81. T. Fujisawa<\/u><\/strong>, E. Taguchi, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cProposal of compact three-mode exchanger based on symmetric and asymmetric directional couplers with integrated mode rotator,\u201d The 22nd Microoptics Conference (MOC 2017), Paper B-4, Tokyo, Japan, Nov. 19-22, 2017.
          <\/li>\n\n\n\n
        82. S. Nakano, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cBeam propagation analysis of optical activity and circular dichroism in helically twisted photonic crystal fiber,\u201d The 22nd Microoptics Conference (MOC 2017), Paper P-16, Tokyo, Japan, Nov. 19-22, 2017.
          <\/li>\n\n\n\n
        83. Y. Fujiwara, K. Takahashi, T. Fujisawa<\/u><\/strong>, K. Maeda, and M. Arai, \u201cSn Concentration and Surface Morphology of GeSn Layer on GaAs (311)B Substrate grown by MOVPE,\u201d 19th <\/sup>International Conference on Metalorganic Vapor Phase Epitaxy, P1-39, Nara, Japan, June 2018.
          <\/li>\n\n\n\n
        84. Y. Amma, K. Takenaga, T. Fujisawa<\/u><\/strong>, K. Saitoh, M. Koshiba, and K. Aikawa, \u201cDependence of Cladding Diameter on Inter-Core Crosstalk in Heterogeneous Multi-Core Fibers,\u201d OptoElectronics and Communications Conference (OECC), Paper 3C2-2, Jeju, Korea, July 2-6, 2018.
          <\/li>\n\n\n\n
        85. T. Sato, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cNovel All-Optical Diode based on Single-Port and Four-Port Photonic Crystal Cavities,\u201d OptoElectronics and Communications Conference (OECC), Paper 4D2-2, Jeju, Korea, July 2-6, 2018.
          <\/li>\n\n\n\n
        86. J. Takano, T. Sato, Y. Sawada, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cProposal of Si Four-Wavelength Multiplexer using Higher-Order Mode for 100GbE,\u201d OptoElectronics and Communications Conference (OECC), Paper 4E2-4, Jeju, Korea, July 2-6, 2018.
          <\/li>\n\n\n\n
        87. Y. Sawada, T. Sato, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cA Broadband Silicon Two-Mode Multiplexer Designed by Wavefront Matching Method,\u201d OptoElectronics and Communications Conference (OECC), Paper 5E4-4, Jeju, Korea, July 2-6, 2018.
          <\/li>\n\n\n\n
        88. (Invited talk) T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cPLC-based Mode Controlling Devices for Mode-Division-Multiplexing,\u201d OptoElectronics and Communications Conference (OECC), Paper 6E1-2, Jeju, Korea, July 2-6, 2018.
          <\/li>\n\n\n\n
        89. T. Fujisawa<\/u><\/strong>, M. Arai, and K. Saitoh, \u201cMicroscopic Gain Analysis of Modulation-Doped GeSn Quantum Well: Epitaxial Design toward High-Temperature Lasing,\u201d 15th<\/sup> International Conference on Group IV Photonics (GFP), Paper WA3, Cancun, Mexico, Aug. 29-31, 2018.
          <\/li>\n\n\n\n
        90. T. Sato, K. Yoshida, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cSuppression of Group-Delay Spread in Coupled Two-LP-Mode Four-Core Fiber,\u201d IEEE Photonics Conference (IPC 2018), Paper MA4.2, Reston, USA, Sept. 30-Oct. 4, 2018.
          <\/li>\n\n\n\n
        91. J. Takano, T. Fujisawa<\/u><\/strong>, T. Sato, Y. Sawada, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cLow-loss and Fabrication-tolerant Si Four-wavelength Multiplexer Using Higher-order Mode for 100\/400GbE,\u201d Optical Fiber Communication Conference (OFC), Paper Tu2J.2, San Diego, USA, Mar. 3-7, 2019.<\/a>
          <\/li>\n\n\n\n
        92. Y. Sawada, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cFirst Experimental Demonstration of Wavefront-matching-method-designed Silicon Mode Converters,\u201d Optical Fiber Communication Conference (OFC), Paper W3B.4, San Diego, USA, Mar. 3-7, 2019.
          <\/li>\n\n\n\n
        93. M. Kudo, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cA Broadband Mode Divider with Arbitrary Branching Ratio Based on Wavelength-insensitive Coupler,\u201d Optical Fiber Communication Conference (OFC), Paper Th2A.4, San Diego, USA, Mar. 3-7, 2019.
          <\/li>\n\n\n\n
        94. Y. Yasui, K. Yoshida, T. Sato, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cSimple GDS Estimation Method for Coupled Multicore Fibers with Various Core Layouts,\u201d International Symposium on Extremely Advanced Transmission Technologies (EXAT2019), Paper P-19, Ise, Japan, May 29-31, 2019.
          <\/li>\n\n\n\n
        95. Y. Amma, K. Takenaga, T. Fujisawa<\/u><\/strong>, K. Saitoh, M. Koshiba, and K. Aikawa, \u201cBehavior of inter-core crosstalk against disturbance in heterogeneous multi-core fibers,\u201d International Symposium on Extremely Advanced Transmission Technologies (EXAT2019), Paper P-, Ise, Japan, May 29-31, 2019.
          <\/li>\n\n\n\n
        96. (Invited talk) T. Fujisawa<\/u><\/strong>, M. Arai, and K. Saitoh, \u201cEpitaxial design of GeSn quantum wells for optoelectronic applications,\u201d 2019 IEEE Photonics Society Summer Topicals Meeting Series, MA4.1, Miami, USA, 2019.
          <\/li>\n\n\n\n
        97. M. Shirata, M. Kudo, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201cA Design of Low MDL Scrambling-type PLC 6-mode Multiplexer,\u201d Optoelectronics and Communications Conference (OECC 2019), Paper TuE2-1, Fukuoka, Japan, July 7-11, 2019.
          <\/li>\n\n\n\n
        98. N. Sugawara, M. Kudo, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Tsujikawa, K. Nakajima, and K. Saitoh, \u201c3-Mode PLC-Based Mode Dependent Loss Equalizer in MDM Transmission,\u201d Optoelectronics and Communications Conference (OECC 2019), Paper TuE2-2, Fukuoka, Japan, July 7-11, 2019.
          <\/li>\n\n\n\n
        99. T. Sato, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cUltra-Robust Design of Mode (De)Multiplexer Based on Asymmetrical Directional Coupler Using Wire and One-Side Rib Waveguides,\u201d Optoelectronics and Communications Conference (OECC 2019), Paper TuE2-3, Fukuoka, Japan, July 7-11, 2019.
          <\/li>\n\n\n\n
        100. K. Nishimura, T. Sato, T. Fujisawa<\/u><\/strong>, Y. Amma, K. Takenaga, K. Aikawa, and K. Saitoh, \u201cCladding Diameter Dependence of Inter-Core Crosstalk in Heterogeneous Multicore Fibers,\u201d Optoelectronics and Communications Conference (OECC 2019), Paper ThG3-2, Fukuoka, Japan, July 7-11, 2019.
          <\/li>\n\n\n\n
        101. Y. Sawada, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cFabrication of Ultrasmall Silicon Waveguide Lenses Designed by Wavefront-Matching Method,\u201d 16th<\/sup> International Conference on Group IV Photonics (GFP), Paper WP5, Singapore, Aug. 28-30, 2019.
          <\/li>\n\n\n\n
        102. (Invited talk) M. Arai, Y. Imamura, T. Fujisawa<\/u><\/strong>, and K. Maeda, \u201cMOVPE growth and evaluation of mid-infrared range superlattice,\u201d 2019 Asia Pacific Society for Materials Research (APSMR2019), Hokkaido, Japan, 2019.
          <\/li>\n\n\n\n
        103. M. Shirata, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cA design of PLC-based 6-mode exchanger in mode division multiplexed transmission,\u201d IEEE Photonics Conference (IPC 2019), Paper TuH1.4, San Antonio, USA, Sept. 30-Oct. 3, 2019.
          <\/li>\n\n\n\n
        104. M. Shirata, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cA Broadband PLC-type Mode Converter Designed by Wavefront Matching Method,\u201d The 24th Microoptics Conference (MOC2019), Paper P-35, Toyama, Japan, Nov. 17-20, 2019.
          <\/li>\n\n\n\n
        105. K. Nakamura, T. Sato, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cNonreciprocity Enhancement of Graphene-on-Si Waveguide using One-Dimensional Photonic Crystal,\u201d The 24th Microoptics Conference (MOC2019), Paper P-48, Toyama, Japan, Nov. 17-20, 2019.
          <\/li>\n\n\n\n
        106. J. Takano, T. Fujisawa<\/u><\/strong>, Y. Sawada, and K. Saitoh, \u201cLow-loss silicon 2\u00d74\u03bb multiplexers composed of on-chip polarization-splitter-rotator and 2\u00d72 and 2\u00d71 Mach-Zehnder filters for 400GbE,\u201d Optical Fiber Communication Conference (OFC), Paper M3F.4, San Diego, USA, Mar. 8-12, 2020.
          <\/li>\n\n\n\n
        107. T. Fujisawa<\/u><\/strong>, T. Sakamoto, M. Miyata, T. Matsui, T. Hashimoto, R. Kasahara, K. Nakajima, and K. Saitoh, \u201cWavefront-matching-method-designed six-mode-exchanger based on grating-like waveguide on silica-PLC platform,\u201d Optical Fiber Communication Conference (OFC), Paper Th1A.5, San Diego, USA, Mar. 8-12, 2020.
          <\/li>\n\n\n\n
        108. K. Nakamura, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cA tunable mode divider based on wavelength insensitive coupler using thermo-optic effect for gain-equalization in MDM network,\u201d Optical Fiber Communication Conference (OFC), Paper Th2A.6, San Diego, USA, Mar. 8-12, 2020.
          <\/li>\n\n\n\n
        109. Y. Sawada, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cExperimental Demonstration of Broadband Silicon Mode Converter Designed by Wavefront-Matching Method,\u201d 2020 Conference on Lasers and Electro-Optics\/Quantum Electronics and Laser Science Conference (CLEO\/QELS 2020), SM4J.6, San Jose, USA, 2020.
          <\/li>\n\n\n\n
        110. Y. Sawada, T. Fujisawa<\/u><\/strong>, and K. Saitoh, \u201cBroadband Design of Silicon Photonics Four-Mode (de)Multiplexer by Wavefront Matching Method,\u201d 2020 Advanced Photonics Congress, Paper ITh3A.6, July 13-16, 2020.
          <\/li>\n\n\n\n
        111. (Invited talk) K. Saitoh, T. Fujisawa<\/u><\/strong>, and T. Sato, \u201cControl of group delay spread in randomly-coupled multicore fibers,\u201d OptoElectronics and Communications Conference (OECC), T3-1-2, Taipei, Taiwan, Oct. 4-8 2020.
          <\/li>\n\n\n\n
        112. N. Sugawara, T. Fujisawa<\/u><\/strong>, K. Nakamura, Y. Sawada, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cMode Amplitude and Phase Estimation using Multimode NFP by ANN,\u201d Optoelectronics and Communications Conference (OECC 2020), Paper T5-2-5, Taipei, Taiwan, Oct. 4-8, 2020.
          <\/li>\n\n\n\n
        113. Y. Wang, T. Fujisawa<\/u><\/strong>, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cStep index 8-core fiber with 125-um cladding diameter for O-band use,\u201d Optoelectronics and Communications Conference (OECC 2020), Paper T3-2-4, Taipei, Taiwan, Oct. 4-8, 2020.
          <\/li>\n\n\n\n
        114. T. Fujisawa<\/u><\/strong> and K. Saitoh, \u201cUltrasmall two-mode dividers based on mosaic structure designed by direct-binary-search algorithm aided by artificial neural network,\u201d Optoelectronics and Communications Conference (OECC 2020), Paper T5-1-3, Taipei, Taiwan, Oct. 4-8, 2020.
          <\/li>\n\n\n\n
        115. N. Sugawara, T. Fujisawa<\/u><\/strong>, K. Nakamura, Y. Sawada, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cMode amplitude and phase estimation of NFP of six-mode FMF based on artificial neural network with the help of grey-wolf-optimizer,\u201d <\/a>46th European Conference and Exhibition on Optical Communication (ECOC 2020), Tu2A-6, online, 2020.
          <\/li>\n\n\n\n
        116. K. Nakamura, T. Fujisawa<\/u><\/strong>, Y. Sawada, T. Sato, and K. Saitoh, \u201cUltrasmall O-band CWDM 4\u03bb<\/em> MUX based on Mosaic Structure for Dense Optical Interconnects,\u201d 2021 Conference on Lasers and Electro-Optics\/Quantum Electronics and Laser Science Conference (CLEO\/QELS 2021), JW1A.105, San Jose, USA, 2021.
          <\/li>\n\n\n\n
        117. Y. Sawada, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cExperimental demonstration of broadband silicon 4-mode (de)multiplexer designed by wavefront-matching method,\u201d Optical Fiber Communication Conference (OFC), Paper F2B.4, online, June. 6-10, 2021.
          <\/li>\n\n\n\n
        118. T. Muratsubaki, T. Fujisawa<\/u><\/strong>, Y. Sawada, T. Sato, and K. Saitoh, \u201cFabrication-Tolerant Four-Mode Waveguide Crossing Based on PhC-like Subwavelength Structures at 2 \u03bcm,\u201d Advanced Photonics Congress (APC), Paper IM2A.3, Virtual Conference, July 26-30, 2021.<\/a>
          <\/li>\n\n\n\n
        119. Y. Sawada, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cSwitchable Mode Converter for Four-Mode MDM System Assisted by Passive Mode Controlling Device Designed by Wavefront Matching Method,\u201d Microoptics Conference (MOC), PO-13, online, Sept, 2021.
          <\/li>\n\n\n\n
        120. Y. Wang, T. Fujisawa<\/u><\/strong>, Y. Sagae, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201c125-\u03bcm Cladding Heterogeneous Step-Index Multi-core Fibers for Datacenter Networks,\u201d The 6th International Symposium on Extremely Advanced Transmission Technologies (EXAT), Paper P-06, Virtual Conference, November 3-5, 2021.
          <\/li>\n\n\n\n
        121. T. Sato, T. Fujisawa<\/u><\/strong>, T. Mitarai, T. Hiratani, T. Okimoto, T. Ishikawa, N. Kono, N. Fujiwara, H. Yagi, and K. Saitoh, \u201cDesign of Resonant-Characteristics-Monitorable Si Wavelength Filter Using Face-To-Face Loop Mirrors for Heterogeneous Integrated Tunable Lasers,\u201d International Conference on Group IV Photonics (GFP), Paper ThB2.3, online, Dec. 8-10, 2021.
          <\/li>\n\n\n\n
        122. T. Fujisawa<\/u><\/strong>, T. Mori, J. Sakamoto, Y. Yamashita, T. Sakamoto, R. Imada, R. Ima, T. Sato, K. Watanabe, R. Kasahara, T. Hashimoto, K. Nakajima, and K. Saitoh, \u201cSilica-PLC based mode-dependent-loss equalizer for two LP mode transmission,\u201d Optical Fiber Communication Conference (OFC), Paper M4J.4, San Diego, USA, Mar. 6-10, 2021.
          <\/li>\n\n\n\n
        123. T. Mitarai, T. Fujisawa<\/u><\/strong>, T. Okimoto, N. Kono, N. Fujiwara, Y. Sawada, T. Muratsubaki, T. Sato, K. Saitoh, and H. Yagi, \u201c<\/a>Compact power splitters with mosaic-based structure designed by Bayesian direct-binary-search method,\u201d Optoelectronics and Communications Conference (OECC 2022), Paper TuE2-4, Toyama, Japan, July 3-6, 2022.
          <\/li>\n\n\n\n
        124. G. Ocampo, T. Sato, T. Fujisawa<\/u><\/strong>, Y. Amma, and K. Saitoh, \u201cAnalysis of crosstalk dependence of cladding diameter in heterogeneous multi-core fibers by considering polarization-mode coupling effects,\u201d Optoelectronics and Communications Conference (OECC 2022), Paper TuC2-4, Toyama, Japan, July 3-6, 2022.
          <\/li>\n\n\n\n
        125. M. Arai, K. Maeda, Y. Iwakiri, and T. Fujisawa,<\/u><\/strong> \u201cTemperature Dependence of Mid-infrared Emission Process of InAs\/GaSb Superlattices Grown by MOVPE,\u201d Conference on Lasers and Electro-Optics Pacific-Rim 2022 (CLEO-PR2022), Paper CMP11A-03, Sapporo, Japan, Aug. 2022.
          <\/li>\n\n\n\n
        126. Y. Asama, T. Fujisawa<\/u><\/strong>, T. Sato, T. Mori, T. Sakamoto, R. Imada, Y. Yamashita, K. Nakajima, and K. Saitoh, \u201cCascaded Wavefront-Matching-Method Designed 6-Mode-Exchangers for MDL Management in MDM Transmission,\u201d Conference on Lasers and Electro-Optics Pacific-Rim 2022 (CLEO-PR2022), Paper CWP10B-05, Sapporo, Japan, Aug. 2022.
          <\/li>\n\n\n\n
        127. T. Mori, T. Fujisawa<\/u><\/strong>, J. Sakamoto, Y. Yamashita, T. Sakamoto, R. Imada, R. Ima, T. Sato, K. Watanabe, R. Kasahara, T. Hashimoto, K. Saitoh, and K. Nakajima, \u201cVariable mode-dependent-loss equalizer based on silica-PLC for two-LP-mode transmission,\u201d 48th European Conference and Exhibition on Optical Communication (ECOC 2022), Paper Tu5.11, Sept. 2022.
          <\/li>\n\n\n\n
        128. M. Arai, Y. Iwakiri, T. Fujisawa,<\/u><\/strong> and K. Maeda, \u201cWide wavelength range emission from InAs\/GaSb type-II superlattices grown by MOVPE,\u201d 28-th International Semiconductor Laser Conference (ISLC2022), Paper TuP-28-01, Matsue, Japan, Oct. 2022.
          <\/li>\n\n\n\n
        129. T. Fujisawa<\/u><\/strong><\/a>, and K. Saitoh, \u201cFabrication-tolerant, 2-mode, 4\u03bb multiplexer based on Si waveguides for beyond Tbit\/s optical Ethernet,\u201d Optical Fiber Communication Conference (OFC), Paper M1C.4, San Diego, USA, 2022.
          <\/li>\n\n\n\n
        130. G. Ocampo, T. Sato, T. Fujisawa<\/u><\/strong>, M. Nakagawa, and K. Saitoh, \u201cRelationship between Polarization Mode Dispersion and Crosstalk in Heterogeneous Multi-core Fibers with Different Cladding Diameters,\u201d Optical Fiber Communication Conference (OFC), Paper M3B.4, San Diego, USA, 2022.
          <\/li>\n\n\n\n
        131. T. Muratsubaki, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cCompact Mode-evolution-based 2-mode 3-dB Coupler in the 2-\u00b5m Waveband Using Shortcuts to Adiabaticity,\u201d The 7th International Symposium on Extremely Advanced Transmission Technologies (EXAT), Paper P-04, Matsue, Japan, May 17-19, 2023.
          <\/li>\n\n\n\n
        132. H. Wang, T. Fujisawa<\/u><\/strong>, T. Sato, T. Mori, T. Sakamoto, Y. Yamashita, R. Imada, K. Nakajima, and K. Saitoh, \u201cOptimization of PLC 10-mode Photonic Lantern Mode Multiplexer,\u201d The 7th International Symposium on Extremely Advanced Transmission Technologies (EXAT), Paper P-06, Matsue, Japan, May 17-19, 2023.
          <\/li>\n\n\n\n
        133. H. Wang, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, “Proposal of an ultra-compact mode multiplexer using air-hole type photonic crystal waveguides,\u201d The 28th OptoElectronics and Communications Conference (OECC), Paper OECC2023-0317-5, Shanghai, China, July 2-6, 2023.
          <\/li>\n\n\n\n
        134. Z. Zhao, T. Sato, T. Fujisawa<\/u><\/strong>, T. Iwaya, Y. Sagae, T. Sakamoto, T. Matsui, K. Nakajima, and K. Saitoh, \u201cDesign of Double-Cladding Heterogeneous 2LP-Mode 6-Core Fiber with Two-Ring Layout,\u201d The 28th OptoElectronics and Communications Conference (OECC), Paper OECC2023-0317-7, Shanghai, China, July 2-6, 2023.
          <\/li>\n\n\n\n
        135. T. Mitarai, T. Fujisawa<\/u><\/strong>, Y. Sawada, T. Okimoto, N. Kono, N. Fujiwara, T. Muratsubaki, T. Sato, K. Saitoh, and H. Yagi, \u201cCompact passive waveguides using mosaic-based device with triangular lattice photonic crystal-like structure<\/a>,\u201d Solid State Materials and Devices (SSDM2023), Paper H-7-02, Nagoya, Japan, Sep. 5-8, 2023.
          <\/li>\n\n\n\n
        136. H. Wang, T. Fujisawa<\/u><\/strong>, T. Sato, and K. Saitoh, \u201cProposal of 5-mode multiplexer using pillar type photonic crystal waveguides,\u201d Microoptics Conference (MOC), Paper PO-3, Miyazaki, Japan, Sep. 24-27, 2023.
          <\/li>\n\n\n\n
        137. K. Maeda, T. Sato, T. Fujisawa<\/u><\/strong>, T. Mitarai, T. Hiratani, T. Okimoto, T. Ishikawa, N. Kono, N. Fujiwara, H. Yagi, and K. Saitoh, \u201cHigh Tolerant Design of Peltier-Free Si Wavelength Filter Using Mach-Zehnder Interferometer for DWDM Application,\u201d Microoptics Conference (MOC), Paper PO-4, Miyazaki, Japan, Sep. 24-27, 2023.
          <\/li>\n\n\n\n
        138. R. Ima, T. Fujisawa<\/u><\/strong>, M. Wada, T. Mori, T. Sakamoto, R. Imada, T. Sato, T. Matsui, K. Nakajima, and K. Saitoh, \u201cWavelength insensitive three-mode directional coupler designed by wavefront matching method for broadband mode- dependent-loss equalizer,\u201d Microoptics Conference (MOC), Paper PO-44, Miyazaki, Japan, Sep. 24-27, 2023.
          <\/li>\n\n\n\n
        139. S. Ochiai, T. Fujisawa<\/u><\/strong>, K. Nakamura, T. Sato, M. Okano, and K. Saitoh, \u201cS+C+L Band Tapered Asymmetric Directional Coupler for Broadband Polarization Splitter-Rotator,\u201d Microoptics Conference (MOC), Paper H-4, Miyazaki, Japan, Sep. 24-27, 2023.<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n\n\n

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