High-speed and ultralow-chirp 11.55 μm multiquantum well λ/4-shifted DFB lasers

Author

Uomi, Kazuhisa ; Tsuchiya, Tomonobu ; Nakano, Hiroyuki ; Aoki, Masahiro ; Suzuki, Makoto ; Chinone, Naoki

Author_Institution

Hitachi Ltd., Tokyo, Japan

Volume

27

Issue

6

fYear

1991

fDate

6/1/1991 12:00:00 AM

Firstpage

1705

Lastpage

1713

Abstract

A high-speed ultralow-chirp 1.55 μm multiple-quantum-well (MQW) λ/4-shifted distributed feedback (DFB) laser is demonstrated by using low capacitance structure and by the optimization of an NQW structure in an active layer. A 3-dB bandwidth of 14 GHz as an NQW-DFB laser was achieved, and a chirp width of 3.4 Å (20 dB down full width) was also achieved at 10 Gb/s direct modulation. In addition, kL dependence of chirp width is identified by the adiabatic chirping width is identified by the adiabatic chirping due to the spatial hole burning along a laser axis. From the systematic investigation of the nonlinear gain coefficient of NQW lasers as well as bulk lasers, it is suggested that the physical origin of nonlinear damping can be explained by the spectral hole burning theory

Keywords

distributed feedback lasers; laser transitions; optical hole burning; semiconductor junction lasers; semiconductor quantum wells; 1.55 micron; active layer; adiabatic chirping width; bandwidth; chirp width; direct modulation; high speed ultralow-chirp multiquantum well shifted distributed feedback laser; laser axis; low capacitance structure; nonlinear damping; nonlinear gain coefficient; optimization; spatial hole burning; Chirp modulation; Damping; Fiber lasers; Frequency; High speed optical techniques; Laser modes; Laser theory; Quantum well devices; Quantum well lasers; Semiconductor lasers;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.89996

Filename

89996