Spectral Linewidth Reduction in Widely Wavelength Tunable DFB Laser Array

Author

Ishii, Hiroyuki ; Kasaya, Kazuo ; Oohashi, Hiromi

Author_Institution

Photonics Labs., Nippon Telegraph & Telephone Corp., Atsugi

Volume

15

Issue

3

fYear

2009

Firstpage

514

Lastpage

520

Abstract

We have developed an L-band tunable distributed feedback laser array (TLA) with a new design to reduce the spectral linewidth. A wide wavelength tuning range of ~ 40 nm is obtained with a high fiber output power of 20 mW and a high side-mode suppression ratio of >50 dB in the TLA module. A narrow linewidth of less than 580 kHz is achieved over the entire tuning range. Furthermore, we investigated the causes of linewidth variation. We found that a TLA with a longer cavity is more tolerant to external feedback, which reduces the variation in linewidth.

Keywords

distributed feedback lasers; laser arrays; laser beams; laser cavity resonators; laser feedback; laser modes; laser tuning; optical design techniques; optical fibres; semiconductor optical amplifiers; spectral line breadth; L-band tunable distributed feedback laser array; TLA module; external cavity laser; external feedback; high side-mode suppression ratio; narrow linewidth reduction; power 20 mW; semiconductor optical amplifier; spectral linewidth reduction; wide wavelength tuning; Distributed feedback devices; Fiber lasers; L-band; Laser feedback; Laser modes; Laser tuning; Optical arrays; Optical fiber communication; Power generation; Tunable circuits and devices; Distributed feedback (DFB) lasers; optical fiber communications; optical transmitters; tunable lasers;

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/JSTQE.2008.2010237

Filename

5068476