Wavelength tuning in self-seeded gain switched Fabry-Perot laser diode with moire grating

Author

Li, Shenping ; Chiang, K.S. ; Gambling, W.A.

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong

Volume

35

Issue

25

fYear

1999

fDate

12/9/1999 12:00:00 AM

Firstpage

2209

Lastpage

2210

Abstract

The authors propose a simple method for generating wavelength tunable singlemode picosecond pulses at a fixed repetition rate. This method is based on self-seeding a Fabry-Perot (FP) laser diode having a fibre external cavity formed by a moire grating with a proper channel spacing. Stepwise wavelength tuning over a large range can be achieved by changing the FP cavity roundtrip phase shift, and fast electrical tuning is possible by incorporating a phase-control section into the FP cavity. By using a two-channel moire grating and a temperature-controlled FP laser diode, tuning of picosecond pulses at a repetition rate of ~2 GHz between two wavelengths ~11 nm apart is demonstrated. A sidemode suppression ratio of >25 dB has been achieved

Keywords

diffraction gratings; laser cavity resonators; laser modes; laser tuning; moire fringes; optical fibres; optical pulse generation; semiconductor lasers; FP cavity roundtrip phase shift; channel spacing; fast electrical tuning; fibre external cavity; fixed repetition rate; moire grating; phase-control section; self-seeded gain switched Fabry-Perot laser diode; self-seeding; sidemode suppression ratio; stepwise wavelength tuning; temperature-controlled FP laser diode; two-channel moire grating; wavelength tunable singlemode picosecond pulse generation; wavelength tuning;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19991479

Filename

820304