光情報通信基盤構築へ向けた極限性能半導体レーザの開発

1996 Fiscal Year Annual Research Report

• Project/Area Number: 08555011
• Section: 試験
• Research Institution: The University of Tokyo
• Principal Investigator: 多田 邦雄 東京大学, 工学系研究科, 教授 (00010710)
• Co-Investigator(Kenkyū-buntansha): 平田 隆昭 横河電機光エレクトロニクス研究所, 主任研究員 ; 霜垣 幸浩 東京大学, 工学系研究科, 講師 (60192613) ; 中野 義昭 東京大学, 工学系研究科, 助教授 (50183885)
• Keywords: 利得結合 / 分布帰還型レーザ / 半導体レーザ / DFBレーザ / 波長トリミング / 吸収性回折格子 / InGaAsP / InP / 歪み量子井戸

Research Abstract

1.1.55μm帯吸収性回折格子利得結合(GC)分布帰還型(DFB)レーザの開発:長距離光ファイバ通信で重要な,波長1.55μm帯のGCDFBレーザを,吸収性回折格子構造に基づいて,試作・開発した.活性層には,圧縮歪みInGaAsP多重量子井戸を,また吸収性回折格子層としては,厚さ10nmまたは30nmのInGaAsを用いた.素子は,闘値20〜30mAで室温連続動作し,端面に無反射処理を施すことなく,副モード抑圧比40〜55dBの良好な単一モード発振を,高歩留まりで得ることができた.利得結合係数は,10nm厚で8cm^<-1>,30nm厚で15cm^<-1>程度であった.2.発振波長トリミング:波長多重(WDM)光通信システムに向けた新たな概念「波長トリミング」を提唱し,その実現方法を研究した.まず,カルコゲナイドガラスの光誘起屈折率変化を利用した波長トリミングを試み,レーザ活性層直近に同ガラスを装荷する新しい構造を開発して,He-Neレーザ照射により1.55μm帯で0.14nmの波長トリミングを実現した.次に,波長可変幅をさらに拡大するために,量子井戸の光吸収誘起無秩序化を利用した波長トリミングを試み,YAGレーザ照射によって0.36nmの可変幅を得た.現在,これらの技術を適用した多波長GCDFBレーザアレイの試作を行っている.3.その他の成果:上記以外に,GCDFBレーザに関し,利得結合係数の測定抽出方法の確立,小信号直接変調特性の測定評価,アナログ変調歪み解析,反射戻り光誘起雑音の解析および測定,波長可変DFBC構造の検討,GCDFBレーザトライオードの試作,などを行った.

Research Products

• [Publications] Yoshiaki Nakano: "(Inuited Paper)Recent progress in Semiconductor gain-coupled DFB laser research" Tech.Digest,Conference on Lasers and Electro-Optics(CLEO′96). CTuCl. 76-77 (1996)
• [Publications] Shinya Sudo: "In-Situ monitoring of InGaAs/InGaAsP/InP organometallic Vapor phase epifaxy by spectvoscopic and kinetic ellipsometry" Proc.of the 15th Electronic Materials Symposium. G-13. 201-202 (1996)
• [Publications] Seok Lee: "Effects of gain and index nonlinearities on modulation characteistics of a three section DFB laser" Tech Digest,First Optoelectronics and Communications Conference(OECC′96). 16D2-4. 76-77 (1996)
• [Publications] Tomoaki Toda: "Anomalous Small signal modulation response in gain-coupled DFB lasers with absorptive gratings" Tech,Digest,First Optoelectronics and Communications Conference(OECC'96). 16D2-3. 74-75 (1996)
• [Publications] Geert Morthier: "Enhauced per for mance of DFB lasers for analog communication systems by the introduction of gain coupling" Tech,Digest,First Optoelectronics and Communications Conference(OECC′96). 18P-32. 484-485 (1996)
• [Publications] Tsuragi K,Sudoh: "Wavelength tvimming technology for wultiple-wavelongth distributed-feedback laser attays by photo-absorption induce disordering" Tech,Digest,First Optoelectronics and Communications Conference(OECC′96)(Post-Deadline Papers). PD2-2. 18-19 (1996)
• [Publications] Yi Luo: "Fabrication of gain-coupled DFB semiconductor laser and its integration with electroabsorption modulator" Tech,Digest,25th General Assembly of the lnternational Union of Radio Science. D7.7. 192 (1996)
• [Publications] 須藤 剣: "分布帰還型半導体レーザの波長トリミング技術" 電子情報通信学会論文誌. J79-C-1・10. 400-401 (1996)
• [Publications] Tsurugi K.Sudoh: "Wavelength trimming technology for multiple-wavelength distributed-feedback laser arrays" Conf,Digest,15th IEEE lnternational Semiconductor Laser Couference. W1・5. 133-134 (1996)
• [Publications] Masakazu Sugiyama: "Kinetic studies of the thermal decomposition of MOVPE sources Using Fourier transforminfrared spectroscopy" Second lnternatinal Symposium on Control of Semiconductor lnterfaces. P6-14. (1996)
• [Publications] Tsurugi K.Sudoh: "Wavelength trimming of distributed-feedback lasers by photo-absorption-induced disordering" Conf,proc.,IEEE Lasers and Electro-Optics Society Annual Meeting(LEOS′96). ThU4. 419-420 (1996)
• [Publications] Tsurugi K.Sudoh: "Wavelength trimming technology for multiple-wavelength distributed-feedback laser arrays by photo-induced refractive index change" to be published in Electronics Letters. (1997)
• [Publications] Tsurugi K.Sudoh: "Wavelength trimming by photo-absorption induced disordering for multiple-wavelength distributed-feedback laser arrays" to be published in IEEE photonics Technology Letters. (1997)
• [Publications] Masaki Funabashi: "Comparison of In GaAs absorptive grating structures in 1.55μm InGaAsP/InP stramed MQW gain-coupled DFB lasers" to be published in Conf,Proc.,Ninth lnternational Conf.on Indium Phosphide and Related Materials(IPRM′97). TuP6. (1997)
• [Publications] Shinya Sudo: "In-situ monitoring of arsenic-phosphorus exchange in MOVPE growth of InGaAs/InP quantam wells by Kinetic ellipsometry" to be published in Conf.proc.,Ninth International Conf.on Indium Phosphide and Related Materials(IPRM′97). TuB2. (1997)
• [Publications] Toru Nakura: "First observation of changing coupling coefficients in a gain-coupled DFB laser with absorptive grating by automatic parameter extraction-from sub-threshold spectra" to be published in tech Digest.Conf.on Lasers and Electro-Optics(CLEO′97). CThM1. (1997)