Research : DFB laser with wirelike active regions

Although DFB lasers with partially etched quantum wells have been reported from several reseach groups, excellent characteristics of DFB lasers with completely etched wirelike active regions are experimentally shown. Threshold current dependence on the laser with wirelike active regions is investigated. And also, superior lasing properties of this type of BH-DFB LD, such as submilliampere and stable single-mode operations will be given.

List of reports

Journal Papers

• (1) N. Nunoya, M. Nakamura, H. Yasumoto, S. Tamura and S. Arai, “Low Threshold GaInAsP/InP Distributed Feedback Lasers with Periodic Wire Active Regions Fabricated by CH4/H2 Reactive Ion Etching,” Jpn. J. Appl. Phys., vol. 38, part 2, no. 11B, pp. L1323-L1326, Nov. 1999.
• (2) M. Nakamura, N. Nunoya, H. Yasumoto, M. Morshed, K. Fukuda, S. Tamura and S. Arai, “Very low threshold current density operation of 1.5 µm DFB lasers with wire-like active regions,” Electron. Lett., vol. 36, no. 7, pp. 639-640, Mar. 2000.
• (3) N. Nunoya, M. Nakamura, H. Yasumoto, M. Morshed, K. Fukuda, S. Tamura and S. Arai, “Sub-milliampere operation of 1.55 µm wavelength high index-coupled buried heterostructure distributed feedback lasers,” Electron. Lett., vol. 36, no. 14, pp. 1213-1214, July 2000.
• (4) N. Nunoya, M. Nakamura, M. Morshed, S. Tamura and S. Arai, “High-Performance 1.55 µm Wavelength GaInAsP-InP Distributed-Feedback Lasers with Wirelike Active Regions,” IEEE J. Sel. Top. Quantum Electron., vol. 7, no. 2, pp. 249-258, Mar./Apr. 2001.
• (5) K. Ohira, N. Nunoya, S. Tamura and S. Arai, “Distributed Reflector Laser with Wirelike Active Regions for Asymmetric Output Property,” Jpn. J. Appl. Phys., vol. 41, part. 1, no. 3A, pp. 1417-1418, Mar. 2002.
• (6) K. Ohira, N. Nunoya, H. Yagi, K. Muranushi, A. Onomura, S. Tamura and S. Arai, “Reliable Operation of GaInAsP/InP Distributed Feedback Laser with Wirelike Active Regions,” Jpn. J. Appl. Phys., vol. 42, part. 1, no. 2A, pp. 475-476, Feb. 2003.
• (7) K. Ohira, N. Nunoya and S. Arai, “Stable Single-Mode Operation of Distributed Feedback Lasers with Wirelike Active Regions,” IEEE J. Sel. Top. in Quantum Electron., vol. 9, no. 5, pp. 1166-1171, Sep./Oct. 2003.

International Conferences

• (1) N. Nunoya, M. Nakamura, T. Kojima, S. Tanaka, H. Yasumoto, S. Tamura and S. Arai, “GaInAsP/InP Distributed Feedback Lasers with Periodic Wire-like Active Region Fabricated by CH4/H2 Reactive-Ion-Etching,” The 3rd Pacific Rim Conf. on Lasers and Electro-Optics (CLEO/PR’99), FU3, Seoul (Korea), pp. 1291-1292, Sep. 1999.
• (2) M. Nakamura, N. Nunoya, H. Yasumoto, S Tamura and S. Arai, “GaInAsP/InP High Index Coupled (κi=290 cm-1) DFB Laser with Periodic Wire-like Active Regions,” The 4th Optoelectronics and Communications Conf. (OECC’99), C6S5-4, pp. 1454-1455. Beijing (China), Oct. 1999.
• (3) N. Nunoya, M. Nakamura, H. Yasumoto, M. Morshed, K. Fukuda, S. Tamura and S. Arai, “1.5 µm GaInAsP/InP Double-Quantum-Well DFB Lasers with Deeply Etched Active Regions,” The 12th International Conf. on Indium Phosphide and Related Materials (IPRM2000), TuA2.3, pp. 270-273, Williamsburg (Virginia, USA), May 2000.
• (4) N. Nunoya, M. Nakamura, H. Yasumoto, M. Morshed, K. Fukuda, S. Tamura and S. Arai, “Submilliampere Operation of 1.55 µm GaInAsP/InP DFB Lasers with Deeply Etched Active Regions,” The 5th Optoelectronics and Communications Conf. (OECC2000), 11C1-2, pp. 46-47, Chiba (Japan), July 2000.
• (5) N. Nunoya, M. Morshed, M. Nakamura, S. Tamura and S. Arai, “High Single-mode Yield 1.55 µm GaInAsP/InP BH-DFB Lasers with Periodic Wirelike Active Regions,” The 17th IEEE International Semiconductor Laser Conf. (ISLC2000), TuB1, pp. 45-46, Monterey (USA), Sep. 2000.
• (6) N. Nunoya, M. Morshed, K. Ohira, S. Tamura and S. Arai, “Distributed Reflector Lasers with Wirelike Active Regions Having Asymmetric Output Property,” The 4th Pacific Rim Conf. on Lasers and Electro-Optics (CLEO/PR2001), WC2-2, pp. II-44-45, Makuhari (Chiba, Japan), July 2001.
• (7) N. Nunoya, K. Ohira, H. Midorikawa, K. Muranushi and S. Arai, “CW Life Test of Gain-Matched DFB Laser with Wire-Like Active Regions,” Fifth International Symposium on Contemporary Photonics Technology (CPT2002), E-12, pp. 83-84, Tokyo (Japan), Jan. 2002.
• (8) N. Nunoya, K. Ohira, H. Yagi, K. Muranushi, A. Onomura, T. Sano and S. Arai, “Reliable Operation of Sub-mA Threshold DFB Lasers with Wirelike Active Regions,” The 7th OptoElectronics and Communications Conf. (OECC2002), 10P-60, pp. 306-307, Yokohama (Japan), July 2002.

Meeting Reports

• (1) N. Nunoya, K. Ohira, H. Midorikawa, K. Muranushi, S. Tamura and S. Arai, “Design and Fabrication of Distributed Reflector Lasers for Low Threshold Current and High Efficiency Operation,” ｢低しきい値・高効率動作のための活性層分離型分布反射型レーザの設計と試作｣ Technical Report of IEICE, OPE2001-2 (2001-05), pp.7-12, Tokyo (Japan), May 2001.

Domestic Conferences

• (1) N. Nunoya, M. Nakamura, S. Tanaka, H. Yasumoto, S. Tamura and S. Arai, “GaInAsP/InP DFB Lasers Fabricated by CH4/H2-RIE and OMVPE Regrowth,” 「CH4/H2-RIEとOMVPE 埋め込み再成長によるGaInAsP/InP DFBレーザの作製」 The 46th Spring Meeting, 1999; The Japan Society of Applied Physics and Related Societies, 28p-B-10, Digest III -p. 1189, Noda, Mar. 1999.
• (2) M. Nakamura, N. Nunoya, H. Yasumoto, S. Tamura and S. Arai, “Characteristics of High Index Coupled DFB Laser with Periodic Wire-like Active Region,” 「強屈折率結合を有する活性層分離型DFBレーザの特性」The 60th Autumn Meeting, 1999; The Japan Society of Applied Physics, 3a-ZE-42, Digest III -p. 980, Kobe, Sep. 1999.
• (3) M. Nakamura, N. Nunoya, M. Morshed, H. Yasumoto, S. Tamura and S. Arai, “Wire Width Dependences of Threshold Current for 2QW DFB Lasers with Wirelike Active Region,” 「活性層分離型2層DFBレーザのしきい値電流の細線幅依存性」 The 47th Spring Meeting, 2000; The Japan Society of Applied Physics and Related Societies, 30p-N-1, Digest III -p. 1159, Tokyo, Mar. 2000.
• (4) N. Nunoya, M. Nakamura, K. Fukuda, M. Morshed, S. Tamura and S. Arai, “Submilliampere Operation of BH-DFB Laser with Wirelike Active Region,” 「活性層分離型DFBレーザのサブミリアンペア動作」 The 47th Spring Meeting, 2000; The Japan Society of Applied Physics and Related Societies, 30p-N-2, Digest III -p. 1159, Tokyo, Mar. 2000.
• (5) M. Morshed, N. Nunoya and S. Arai, “Investigation of Single-mode Characteristics of DFB Lasers with Wirelike Active Regions,” 「活性層分離型2層DFBレーザの単一モード特性に関する検討」 The 61st Autumn Meeting, 2000; The Japan Society of Applied Physics, 6p-R-6, Digest III -p. 994, Sapporo, Sep. 2000.
• (6) N. Nunoya, M. Morshed, S. Tamura and S. Arai, “Single-mode Characteristics of GaInAsP/InP DQW BH-DFB Laser with Wirelike Active Regions,” 「GaInAsP/InP活性層分離型2層BH-DFBレーザの単一モード特性」 The 61st Autumn Meeting, 2000; The Japan Society of Applied Physics, 6p-R-7, Digest III -p. 994, Sapporo, Sep. 2000.
• (7) M. Morshed, N. Nunoya, K. Ohira, J. Wiedmann and S. Arai, “Improvement of single-mode characteristics of DFB lasers with gain-matching effect,” ｢活性層分離型DFBレーザの利得整合効果による単一モード性向上｣ The 48th Spring Meeting, 2001; The Japan Society of Applied Physics and Related Societies, 30a-ZS-5, Digest III -p. 1151, Tokyo, Mar. 2001.
• (8) N. Nunoya, M. Morshed, K. Ohira, S. Tamura, B. Chen and S. Arai, “Fabrication of GaInAsP/InP phase shift DFB laser with wirelike active regions,” ｢GaInAsP/InP位相シフト活性層分離型DFBレーザの試作｣The 48th Spring Meeting, 2001; The Japan Society of Applied Physics and Related Societies, 30a-ZS-6, Digest III -p. 1152 Tokyo, Mar. 2001.
• (9) N. Nunoya, K. Ohira, H. Midorikawa, K. Muranushi and S. Arai, “Reliability Test of DFB Laser with Wirelike Active Regions Fabricated by CH4/H2-RIE,” 「CH4/H2-RIEによる活性層分離型DFBレーザの初期信頼性」 The 62nd Autumn Meeting, 2001; The Japan Society of Applied Physics, 13p-B-13 Digest III -p. 868, Aichi, Sep. 2001.
• (10) K. Ohira, N. Nunoya, A. Onomura and S. Arai, “Influence of a Phase Shift on DFB Laser with Wirelike Active Regions,”「 活性層分離型DFBレーザにおける位相シフトの効果」 The 49th Spring Meeting, 2002; The Japan Society of Applied Physics and Related Societies, 29a-YS-7 Digest III -pp. 1143, Kanagawa, Mar. 2002.
• (11) N. Nunoya, K. Ohira, A. Onomura and S. Arai, “Sub-mode suppression ratio (SMSR) of DFB lasers with wirelike active regions,” 「活性層分離型DFBレーザの副モード抑圧比（SMSR）」 The 49th Spring Meeting, 2002; The Japan Society of Applied Physics and Related Societies, 29a-YS-8 Digest III -pp. 1144, Kanagawa, Mar. 2002.