Origin of low dynamic wavelength chirp in short optical pulses from absorptive-grating gain-coupled distributed feedback semiconductor lasers

Author

Sudoh, T.K. ; Funabashi, M. ; Nakano, Y. ; Tada, K. ; Hirata, T.

Author_Institution

Dept. of Electron. Eng., Tokyo Univ., Japan

Volume

31

Issue

2

fYear

1995

fDate

1/19/1995 12:00:00 AM

Firstpage

108

Lastpage

109

Abstract

The instantaneous wavelength shift in gain-switched short optical pulses from absorptive-grating gain-coupled distributed feedback semiconductor lasers showed unusual behaviour which resulted in much smaller chirping than that in conventional lasers. Measurements of spontaneous emission from the absorptive grating layer indicate carrier accumulation in that layer. The origin of the low chirping has been attributed to the fact that the index increase due to carrier depletion in the active layer is compensated for by an index decrease due to carrier accumulation in the grating layer

Keywords

chirp modulation; diffraction gratings; distributed feedback lasers; optical modulation; refractive index; semiconductor lasers; absorptive-grating; active layer; carrier accumulation; carrier depletion; distributed feedback semiconductor lasers; gain-coupled DFB lasers; gain-switched optical pulses; instantaneous wavelength shift; low dynamic wavelength chirp; refractive index decrease; short optical pulses; spontaneous emission measurements;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

Conference_Location

1/19/1995 12:00:00 AM

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19950067

Filename

364364