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List of Papers
Kiichi Hamamoto Last modified date：2024.02.27

Professor / Electrical engineering sciences / Department of Advanced Energy Science and Engineering / Faculty of Engineering Sciences


Papers
1. Keiichiro Shoda, He Xiao, Keiichirou Koudu,Haisong Jiang, Kiichi Hamamoto, Equal input, compact optical power coupler based on a nano-pixel structure designed with machine learning, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.35848/1347-4065/ac678d, 61, SK1017, 2022.06.
2. Zhiyuan Fan, Yasuhiro Hinokuma, Haisong Jiang, Kiichi Hamamoto, Active multi-mode interferometer semiconductor optical amplifier on quantum dots toward high saturated output power under high temperature, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.35848/1347-4065/ac6a3e, 61, SK1019, 2022.06.
3. Yunjie Wang, Haisong Jiang, Kiichi Hamamoto, Space-mode compressor by using nano-pixel, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.35848/1347-4065/ac7b0e, 61, SK1022, 2022.07.
4. Shun Matsubara, Tomoya Zennouji, Haisong Jiang,Kiichi Hamamoto, Rapid automatic waveguide recognition using YOLO and OpenCV for 3D waveguide fabrication, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.35848/1347-4065/ac6e57, 61, SK1023, 2022.08.
5. Haisong Jiang, Mahmoud Nasef and Kiichi Hamamoto, Spatial single dimensional mode based de-multiplexer using slab waveguide, IEICE TRANSACTIONS on Electronics, Vol. E104-C, No. 5, pp. 164-167, May 2021, E104-C, 5, 164-167, 2021.05.
6. Yu Han, Zanhui Chen, Leiyun Wang, Wenying Li, Haisong Jiang, and Kiichi Hamamoto, Asymmetric-ration optical power couplers based on nano-pixel structure, OSA Continum, Vol. 4, No. 2, pp. 556-568, Feb. 2021, 4, 2, 556-568, 2021.02.
7. Zan Hui Chen, Wenying Li, Yu Han, Leiyun Wang, Haisong Jiang, and Kiichi Hamamoto, Vertical field enhancement of spot size converter with nano-pixels waveguide and window structure, Optics Express, Vol. 29, Issue 2, pp. 2757-2768, Jan. 2021　, 29, 2, 2757-2768, 2021.01.
8. Haisong Jiang, Yasuhiro Hinokuma, Sampad Ghosh, Ryota Kuwahata, and Kiichi Hamamoto, Concept demonstration of 3D waveguides shuffle converter for multi-core fiber/single-mode fiber fan-in fan-out configuration toward over 1,000 port count, IEICE TRANSACTIONS on Electronics, Vol. E104-C, No.1, pp. 34-36, January 2021　, E104-C, 1, 34-36, 2021.01.
9. Haisong Jiang, Mahmoud Nasef and Kiichi Hamamoto, Spatial single dimensional mode based de-multiplexer using slab waveguide, IEICE TRANSACTIONS on Electronics, E104-C, 5, 164-167, 2021.05.
10. Yu Han, Zanhui Chen, Leiyun Wang, Wenying Li, Haisong Jiang, and Kiichi Hamamoto, Asymmetric-ration optical power couplers based on nano-pixel structure, OSA Continuum, Vol. 4, No. 2, pp. 556-568, February 2021, https://doi.org/10.1364/OSAC.412933, 4, 2, 556-568, 2021.02.
11. Zan Hui Chen, Wenying Li, Yu Han, Leiyun Wang, Haisong Jiang and Kiichi Hamamoto, Vertical field enhancement of spot size converter with nano-pixels waveguide and window structure, Optics Express, 29, 2, 2757-2768, 2021.01.
12. Haisong Jiang, Yasuhiro Hinokuma, Sampad Ghosh, Ryota Kuwahata, and Kiichi Hamamoto, Concept demonstration of 3D waveguides shuffle converter for multi-core fiber/single-mode fiber fan-in fan-out configuration toward over 1,000 port count, IEICE TRANSACTIONS on Electronics, E104-C, 1, 2021.01.
13. Wenying Li, Yu Han, Zanhui Chen, Leiyun Wang, Haisong Jiang, and Kiichi Hamamoto, Amplifier-assisted waveguide sensing toward breath-gas analysis, Engineering Sciences Reports, Kyushu University, 42, 1, 2020.09, 光導波路ガスセンサの性能向上を目的として光アンプを適用した実験および解析結果。.
14. Satoshi Ogawa, Ahmad Syahrin Idris, Yu Han, Haisong Jiang, Kiichi Hamamoto, Surface improvement investigation of sol-gel SiO2 cladding for waveguide device passivation, Japanese Journal of Applied Physics, 10.7567/1347-4065/ab27b2, 58, SJ, 2019.01, The sol-gel method is a well-known process for SiO2 formation on top of a semiconductor-based waveguide. This method does not require expensive equipment or SiH4 gas. However, it may result in difficulty with wet-etching, which prevents proper current injection into the semiconductor layer. We have investigated the surface condition of sol-gel SiO2 on top of Si, and have confirmed that the main causes of the anti-etching property might be due to the formation of a polymer layer after the curing process. To improve the surface condition, plasma ashing, in addition to 700 °C curing, is proposed. Regular wet etching of SiO2 layer on Si with a ratio of 1800 nm min-1 has been successfully confirmed..
15. Zan Hui Chen, Wenying Li, Yu Han, Haisong Jiang, Kiichi Hamamoto, Proposal of two tangent air hole structure for higher sensitivity gas sensor, Japanese Journal of Applied Physics, 10.7567/1347-4065/ab26ab, 58, SJ, 2019.01, One-dimensional photonic crystal (1D PhC) cavities are used as ultrasensitive gas sensors due to their high sensitivity to changes in the surrounding environment. One of the issues for typical 1D PhC-based sensors is that the confined optical field does not fully overlap with analytes, which therefore leads to low sensitivity. Herein, we propose and numerically investigate a photonic crystal cavity by introducing a two tangent air hole array to improve the gas refractive index sensitivity. We also investigate the spectral feature of the proposed photonic crystal cavity for varying structure parameters and methane gas concentration. In addition, the coupling efficiency of the waveguide and the influence of the temperature on the proposed structure for sensing applications are analyzed. Theoretical analysis reveals that the proposed two tangent hole structure simultaneously achieves a high sensitivity (353 nm/RIU) and figure of merit (FOM = 1.2 × 104) compared to those observed in previous studies..
16. Wenying Li, Yu Han, Zanhui Chen, Haisong Jiang, Kiichi Hamamoto, Amplifier-assisted CRDS (cavity ring-down spectroscopy) toward compact breath sensing, Japanese Journal of Applied Physics, 10.7567/1347-4065/ab1e3d, 58, SJ, 2019.01, A cavity-ring-down spectroscopy (CRDS) system utilizing waveguide for breath sensing realizes several meter optical path integration that has possibility for ppm-order gas sensing within a compact area. We have proposed an optical amplifier assisted gas sensing system scheme to compensate waveguide propagation loss that may prevent ppm-order gas detection. The amplifier in a CRDS system, however, may result in self-lasing at specific wavelength in case of high pumping condition. Once self-lasing happens, signal light loose its gain from amplifier. The amplifier spontaneous emission that generated by an erbium-doped fiber amplifier affects the background noise level of cavity ring-down waveforms. In this work, we propose the scheme of polarization direction control so as to suspend the self-lasing, and the scheme of additional loss as to suppress ASE power. As a result, we confirmed the suppression of light intensity at a self-lasing wavelength below -50 dBm and the gain improvement of 24 dB at signal..
17. Bingzhou Hong, Tomotaka Mori, Shingo Murakami, Haisong Jiang, Kiichi Hamamoto, A space mode selective light source with over 40 GHz direct modulation bandwidth, Japanese Journal of Applied Physics, 10.7567/1347-4065/ab1fd7, 58, SJ, 2019.01, A high-speed mode selective light source with over 40 GHz direct modulation bandwidth on both 0th and 1st order modes was demonstrated on an active multimode interferometer laser diode (active-MMI LD). By introducing multiple photon-photon resonances (PPR), the bandwidth of small signal frequency response is extremely extended. As the advantage of the active-MMI, the designed PPR frequencies are stable and do not change as the cleaving condition changes. In this work, 1 × 3 asymmetric active-MMI LD was fabricated to introduce multiple PPRs. Over 40 GHz direct modulation bandwidth has been confirmed experimentally on both 0th and 1st order modes..
18. Kiichi Hamamoto, Haisong Jiang, Mode selective active multimode interferometer laser diode - Mode selection principle, and high speed modulation, IEICE Transactions on Electronics, 10.1587/transele.2018ODI0003, E102C, 4, 364-370, 2019.04, We have proposed and demonstrated a mode selective active-MMI (multimode interferometer) laser diode as a mode selective light source so far. This laser diode features; 1) lasing at a selected space mode, and 2) high modulation bandwidth. Based on these, it is expected to enable high speed interconnection into future personal and mobile devices. In this paper, we explain the mode selection, and the high speed modulation principles. Then, we present our recent results concerning high speed frequency response of the fundamental and first order space modes..
19. Ahmad Syahrin Idris, Haisong Jiang, and Kiichi Hamamoto, Multi-layer stacking scheme of sol-gel based SiO2 towards thicker (>0.8 µm) cladding layers for optical waveguides, IEICE Electronics Express, Vol. 15, No. 19, DOI: 10.1587/elex.15.20180783, September 2018, 2018.09.
20. Bingzhou Hong, Kitano Takuya, Haisong Jiang, and Kiichi Hamamoto, Bandwidth enhancement scheme demonstration on direct modulation active-MMI laser diode using multiple photon photon resonance,, Applied Physics Letters, Vol. 111, pp. 221105, Nov. 2017, 査読有, 111, 2017.11.
21. Haisong Jiang, Ryan Imansyah, Luke Himbele, Shota Oe, and Kiichi Hamamoto, Fast mode-switching (60 ns) by using 2 x 2 silicon optical mode switch, IEICE Transaction on Electronics, Vol.E100-C, No.10, pp. 782-788, Oct. 2017, 査読有, E100-C, 2018.06.
22. Bingzhou Hong, Kitano Takuya, Haisong Jiang, Akio Tajima, and Kiichi Hamamoto, First demonstration of mode selective active multimode interferometer laser diode, IEICE Transaction on Electronics, Vol.E100-C, No.10, pp. 775-781, Oct. 2017, 査読有, E100-C, 2017.10.
23. Ahmad Syahrin Idris, Haisong Jiang, and Kiichi Hamamoto, Accurate dry etching technique for germanium waveguide by using CHF3 based inductively coupled plasma, Electronics Letters, Vol. 52, No. 22, pp. 1868-1869, October 2016, 52, 2018.06.
24. Takuya Kitano, Mohammad Nasir Uddin, Bingzhou Hong, Akio Tajima, Haisong Jiang, and Kiichi Hamamoto, Demonstration of photon–photon resonance peak enhancement by waveguide configuration modification on active multimode interferometer laser diode, Japanese Journal of Applied Physics, Vol. 55, 08RD04, July 2016, 55, 2018.06.
25. Ryan Imansyah, Tatsushi Tanaka, Luke Himbele, Haisong Jiang and Kiichi Hamamoto, Electrically Controlled Optical Mode Switch, Japanese Journal of Applied Physics, Vol. 55, 08RB06, July 2016, 55, 2016.07.
26. Ryan Imansyah, Tatsushi Tanaka, Luke Himbele, Haisong Jiang, and Kiichi Hamamoto, Mode Crosstalk Evaluation on Optical Mode Switch by Using MMI Mode Filter, IEICE Transaction on Electonics, Vol. E99-C, No. 7, pp. 825-829, July 2016, E99-C, 7, 2016.07.
27. Yutaka Chaen, Kazuhiro Tanabe, Kiichi Hamamoto, Haisong Jiang, Low Wavelength Dependency Design for MMI (Multi-Mode Interference) Mode Converter, IEICE Electronics Express (ELEX), Vol.12, No. 20, 20150727, Oct. 2015, 20150727, Vol.12, No. 20, 20150727, Oct. 2015, 2015.10.
28. Hirohito Hokazono, Wenying Li, Syota Enami, Kiichi Hamamoto, Haisong Jiang, Gas sensing demonstration by using silica high-mesa waveguide with amplified cavity ring down spectroscopy technique, IEICE Electronics Express (ELEX), Vol.12, No.15, 20150574, Jul. 2015, 53, 20150574, Vol.12, No.15, 20150574, Jul. 2015, 2015.07.
29. Kiichi Hamamoto, Haisong Jiang, Active-MMI devices: concept, proof, and recent progress, Journal of Physics D: Applied Physics, Vol. 48, No. 38, 383001, Sep. 2015, 53, 383001, Vol. 48, No. 38, 383001, Sep. 2015, 2015.09.
30. Ryuta Takakura, Makoto Jizodo, Asuka Fujino, Kiichi Hamamoto, Proposal of Optical Mode Switch
, Japanese Journal of Applied Physics, Vol. 53, 08MB10, July 2014 , 53, 08MB09, 2014.07.
31. Mohamad Nasir Uddin, Takaaki Kizu, Yasuhiro Hinokuma, Kazuhiro Tanabe, Akio Tajima, Kazutoshi Kato, Kiichi Hamamoto, High intrinsic modulation bandwidth InGaAsP/InGaAsP 1.55μm asymmetric active multimode interferometer laser diode by using split pump configuration, Japanese Journal of Applied Physics, Vol. 53, 08MB09, July 2014, 53, 08MB09, 2014.07.
32. Mohamad Nasir Uddin, Takaaki Kizu, Yasuhiro Hinokuma, Kazuhiro Tanabe, Akio Tajima, Kazutoshi Kato, Kiichi Hamamoto, Split pump region in 1.55m InGaAsP/InP asymmetric active multi-mode interferometer laser diode for improved modulation bandwidth, IEICE Transactions on Electronics, Vol. E97-C, No. 7, pp. 781-786, July 2014, E97-C, 7, 781-786, 2014.07.
33. Jiao Chen, Hirohito Hokazono, Daisuke Nakashima, Miki Tsujino, Kiichi Hamamoto, Proposal of multiple-slot silica high-mesa waveguide for infrared sensing, Electronics Express (ELEX), 10, 23, 1-7, 2013.12.
34. 大郷　毅, 浅野　英樹, 浜本 貴一, Reliability Improvement of Superluminescent Diodes Emitting at 1.0m Band by Using InGaAsP Barrier Structure, Electronics Letters, 49, 6, EL20130080, 2013.01.
35. Daisuke Nakashima, Kiichi Hamamoto, Proposal of Novel Strip High-Mesa Waveguide for Infrared Absorption Sensing, Applied Physics Express (APEX), Vol. 5, pp. 062202-1 - 062202-3, Jun. 2012, Applied Physics Express (APEX), Vol. 5, pp. 062202-1 - 062202-3, Jun. 2012, 2012.06.
36. Yasuhiro Hinokuma, Yutaka Chaen, Haisong Jiang, Takuma Hagio, Seiki Nakamura, Akio Tajima, Kiichi Hamamoto, Single Wavelength Emission by Using Novel Asymmetric Configuration for Active Multi-mode interferometer Laser Diodes, IEICE Electronics Express (ELEX), Vol. 9, No. 18, pp. 1448-1453, Sep. 2012, IEICE Electronics Express (ELEX), Vol. 9, No. 18, pp. 1448-1453, Sep. 2012, 2012.09.
37. Zhigang Zang*, Keisuke Mukai*, Paolo Navaretti**, Marcus Duelk**, Christian Velez**, and Kiichi Hamamoto*, Thermal Resistance Reduction in High Power Superluminescent Diodes by Using Active Multi-Mode Interferometer, Applied Physics Letters, Vol. 100, No. 31, pp. 10801-10804, Jan. 2012, Applied Physics Letters, Vol. 100, No. 31, pp. 10801-10804, Jan. 2012, 2012.01.
38. Haisong Jiang*, Yutaka Chaen*, Takuma Hagio*, Kazuisao Tsuruda*, Makoto Jizodo*, Shinji Matsuo**, Jing Xu***, Christophe Peucheret***, and Kiichi Hamamoto*, All Optical Fillip-Flop Operation Based on Asymmetric Active-Multimode Interferometer Bi-stable Laser Diodes, Optics Express, Vol. 19, No. 26, pp. B119-B124, Nov. 2011, Vol. 19, No. 26, pp. B119-B124, Nov. 2011, 2011.11.
39. Haisong Jiang*, Hany Ayad Bastawrous*, Takuma Hagio*, Shinji Matsuo**, and Kiichi Hamamoto*, Low Hysteresis Threshold Current (39mA) Active Multi-Mode-Interferometer (MMI) Bi-stable Laser Diodes Using　Lateral-Modes Bi-stability, IEEE Journal of Selected Topics in Quantum Electronics, Vol. 17, No. 5, pp. 1258-1263, Sep. 2011, IEEE Journal of Selected Topics in Quantum Electronics, Vol. 17, No. 5, pp. 1258-1263, Sep. 2011, 2011.09.
40. Takaaki Kakitsuka* **, Shinji Matsuo**, Kiichi Hamamoto*, Toru Segawa**, Hiroyuki Suzuki**, and Ryo Takahashi**, Injection-Locked Flip-Flop Operation of a DBR Laser, IEEE Photonics Technology Letters, Vol. 23, No. 17, pp. 1261-1263, Sep. 2011, IEEE Photonics Technology Letters, Vol. 23, No. 17, pp. 1261-1263, Sep. 2011, 2011.09.
41. Zhigang Zang*, Keisuke Mukai*, Paolo Navaretti**, Marcus Duelk**, Christian Velez**, and Kiichi Hamamoto, High Power and Stable High Coupling Efficiency (66%) Superluminescent Light Emitting Diodes by using Active Multi-mode Interferometer, IEICE Transactions on Electronics, Vol. E94-C, No. 5, pp. 862-864, May 2011, IEICE Transactions on Electronics, Vol. E94-C, No. 5, pp. 862-864, May 2011, 2011.05.
42. Intekhab Alam, and Kiichi Hamamoto, Slot waveguide by using double high-mesa structure for optical absorption sensing, JJAP, Vol. 49, No. 12, pp. 122503-1-9, Dec. 2010, 2010.12.
43. Zhigang Zang*, Takahiro Minato*, Paolo Navaretti**, Yasuhiro Hinokuma*, Marcus Duelk**, Christian Velez**, and Kiichi Hamamoto*, High power(>110mW) superluminescent diodes using active multi-mode interferometer, IEEE Photonics Technology Letters, Vol. 22, No. 10, pp. 721-723, May 2010, 2010.05.
44. Haisong Jiang, Hany Ayad Bastawrous, Hirotaka Saikaku, Yuichiro Tahara, Shinji Matsuo and Kiichi Hamamoto , Optical Bit-Memory Element Based on Bi-Stability between Different Lateral Modes Using Novel Active Multi-Mode-Interferometer (MMI) for Random Access Memory (RAM) Application, Engineering Science Reports, Kyushu University, 31, 1, 1-6, Vol. 31, No1, pp. 1-6,　June 2009, 2009.06.
45. Teppei Fukuda, Kazunori Okamoto, Yasuhiro Hinokuma, and Kiichi Hamamoto, Phase-locked array laser diodes (LDs) by using 1xN active multi-mode-interferometer (MMI), IEEE Photonics Technology Letters, Volume 21, Issue 3, pp. 176-178, February 2009, 2009.02.
46. Yasunari Matsunaga*, Kosuke Kameyama*, Hiroyuki Wado**, Yasuyuki Takeuchi**, and Kiichi Hamamoto*, SOI-based Si/SiO2 high-mesa waveguides for a compact infrared sensing system, Engineering Science Reports, Kyushu University, Vol. 30, No1, pp. 1-7, June 2008, 2008.06.
47. Kiichi Hamamoto, "Recent Progress of Opto-Electronic Devices by Using Multi-Mode Interference (MMI)", The IEICE Transacctions on Electronics, Vol. J89-C, No.6, pp. 365-371, June 2006.
48. Syogo Shimizu, Mohd Dannial Bin Razali, Kenichi Kasahara, Kiichi Hamamoto, Masaki Ohya, Koichi Naniwae, Jan De Merlier, Kazuhiro Shiba, Shinya Sudo, and Tatsuya Sasaki, First deirect observation of self-imaging effect in activve multimode-interference semiconductor laser diodes, Applied Physics Letters, Vol. 89, 011106-1〜01106-3, 2006.07.
49. Kiichi Hamamoto, Jan De Merlier, Masaki Ohya, Kazuhiro Shiba, Koichi Naniwae, Shinya Sudo, and Tatsuya Sasaki, First demonstration of novel active multi-mode interferometer (MMI) LDs integrated with 1st order-mode permitted waveguides, IEICE Electronics Express, 第2巻第13号399〜403頁, 2005.07.
50. Masaki Ohya, Koichi Naniwae, Shinya Sudo, Tatsuya Sasaki and Kiichi Hamamoto, Over 1-Watt Output Power with Low Driving Voltage 14xx-nm Pump Laser Diodes Using Active Multi-Mode-Interferometer, Electronics Letters誌, 第40巻第17号1063〜1064頁, 2004.08.
51. Kiichi Hamamoto, Koichi Naniwae, and Masaki Ohya, High Power with Low Electric Power Consumption Active Multi-Mode-Interferometer (MMI) Laser Diode for Fiber-Amplifier, Electronics Letters誌, 第38巻第11号517〜519頁, 2002.05.
52. Kiichi Hamamoto, Emilio Gini, Christoph Holtmann and Hans Melchior, Single-Transverse-Mode Active Multi-Mode-Interferometer 1.45um High Power Laser Diode, Applied Physics B誌, 第B73巻pp. 571〜574頁, 2001.05.
53. Kiichi Hamamoto, Emilio Gini, Christoph Holtmann, Hans Melchior, Shinya Sudo, Kazuo Mori, Tatsuya Sasaki, and Masayuki Yamaguchi, Active Multimode Interferometer Semiconductor Optical Amplifier, Electronics Letters誌, 第36巻第14号1218〜1220頁, 2000.07.
54. Koji Kudo, Takao Morimoto, Keiichiro Yashiki, Yoshitaka Yokoyama, Kiichi Hamamoto and Masayuki Yamaguchi, Wavelength-Selectbable Microarray Light Sources of Multiple Ranges Simultaneously Fabricated on Single Wafer, Electronics Letters誌, 第36巻第8号745〜747頁, 2000.04.
55. Koji Kudo, Kenichiro Yashiki, Tatsuya Sasaki, Yoshitaka Yokoyama, Kiichi Hamamoto, Takao Morimoto, and Masayuki Yamaguchi, 1.55-um Wavelength-Selectable Microarray DFB-LD’s with Monolithically Integrated MMI Combiner, SOA, and EA-Modulator, IEEE Photonics Technology Letters誌, 第12巻第3号242〜244頁, 2000.03.
56. Kiichi Hamamoto, Emilio Gini, Christoph Holtmann, Hans Melchior and Tatsuya Sasaki, Single Transverse Mode Active Multimode Interferometer Laser Diode Demonstrated via 1.48um High Power Application, Electronics Letters誌, 第36巻第2号138〜139頁, 2000.01.
57. Kiichi Hamamoto, Emilio Gini, Christoph Holtmann and Hans Melchior, Single Transverse Mode Active MMI InGaAsP/InP Laser Diode, Electronics Letters誌, 第34巻第5号462〜464頁, 1998.03.
58. Takeshi Takeuchi, Tatsuya Sasaki, Kiichi Hamamoto, Masako Hayashi, Kikuo Makita, Kenko Taguchi, and Keiro Komatsu, A Transceiver PIC for Bidirectional Optical Communication Fabricated by Bandgap Energy Controlled Selective MOVPE, IEICE Trans. Electron.誌, 第E80-C巻第1号54〜61頁, 1997.01.
59. Kiichi Hamamoto, Tatsuya Sasaki, Takashi Matsumoto and Keiro Komatsu, Insertion-Loss-Free 1x4 Optical Switch Fabricated Using Band-Gap Energy Controlled Selective MOVPE, Electronics Letters誌, 第32巻第24号2265〜2266頁, 1996.11.
60. Takeshi Takeuchi, Tatsuya Sasaki, Masako Hayashi, Kiichi Hamamoto, Kikuo Makita, Kenko Taguchi, and Keiro Komatasu, A transceiver PIC for bi-directional optical communication fabricated by bandgap energy controlled selective MOVPE, IEEE Photonics Technology Letters誌, 第8巻第3号361〜363頁, 1996.03.
61. Kiichi Hamamoto and Keiro Komatsu, Insertion-Loss-Free 2x2 InGaAsP/InP Optical Switch Fabricated Using Band-Gap Energy Controlled Selective MOVPE, Electronics Letters誌, 第31巻第20号1779〜1781頁, 1995.09.
62. Kiichi Hamamoto, Takayoshi Anan, Keiro Komatsu and Ikuo Mito, Preliminary Reliability Evaluations of GaAs/AlGaAs Electro-Optic Directional Coupler Switches, Japanese Journal of Applied Physics誌, 第32巻第3B号L390〜L391頁, 1993.03.
63. Kiichi Hamamoto, Shigeo Sugou, Keiro Komatsu, and Mitsuhiro Kitamura, Extremely Low Loss 4x4 GaAs/AlGaAs Optical Matrix Switch, Electronics Letters誌, 第29号第17巻1580〜1581頁, 1993.08.
64. Kiichi Hamamoto, Hiroaki Chida, Takashi Miyazaki, and Shin Ishikawa, High-Power 0.98um Strained Quantum-Well Lasers Fabricated Using In Situ Monitored Reactive Ion Beam Etching, IEEE Photonics Technology Letters誌, 第7巻第6号602〜604頁, 1995.06.
65. Kiichi Hamamoto, Takayoshi Anan, Keiro Komatsu, and Mitsunori Sugimoto, First 8x8 Semiconductor Optical Matrix Switch Using GaAs/AlGaAs Electro-Optic Guided-Wave Directional Couplers, Electronics Letters誌, 第28巻第5号441〜443頁, 1992.02.
66. Keiro Komatsu, Kiichi Hamamoto, Mitsunori Sugimoto, Akira Ajisawa, and Akira Suzuki, 4x4 GaAs/AlGaAs Optical Matrix Switches with Uniform Device Characteristics Using Alternating dB Electrooptic Guided-Wave Directional Couplers, Journal of Lightwave Technology誌, 第9巻第7号871〜878頁, 1991.07.
67. Kiichi Hamamoto, Hajime Ozaki, Kazutomi Suzuki, Mitsuru Yano, Kenji Nakatani, and Hiroshi Okaniwa, The Influence of Unsteady State Plasma on The Properties of a-Si:H Films Formed by Glow Discharge Chemical Vapour Deposition, Thin Solid Films誌, 第177巻161〜170頁, 1988.10.


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