Complex-coupled λ/4-shifted DFB lasers with a flat FM response

Author

Okai, Makoto ; Suzuki, M. ; Aoki, M.

Author_Institution

Central Res. Labs., Hitachi Ltd., Tokyo, Japan

Volume

1

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

461

Lastpage

465

Abstract

Theoretical analysis of the wavelength tuning characteristics shows that the carrier effect in λ/4-shifted DFB lasers with in-phase complex grating can produce a large red shift by a self-suppressing mechanism of the spatial hole-burning effect while maintaining stable single-mode operation. The FM response of these lasers can thus avoid having a dip at lower modulation frequencies, where the thermal red shift opposes the carrier blue shift of conventional lasers. An in-phase complex-coupled λ/4-shifted DFB laser with a ridge structure is described that gives a flat FM response from 10 kHz to over 20 GHz (3-dB bandwidth) achieved by using the self-suppressing mechanism of the spatial hole-burning effect. This bandwidth is the widest ever achieved for frequency modulation

Keywords

diffraction gratings; distributed feedback lasers; frequency modulation; laser accessories; laser cavity resonators; laser feedback; laser tuning; optical fabrication; optical hole burning; optical modulation; red shift; semiconductor lasers; 10 kHz to 20 GHz; bandwidth; carrier effect; complex-coupled λ/4-shifted DFB lasers; flat FM response; frequency modulation; in-phase complex grating; red shift; ridge structure; self-suppressing mechanism; single-mode operation; spatial hole-burning effect; wavelength tuning characteristics; Bandwidth; Frequency modulation; Frequency shift keying; Gratings; Laser stability; Laser theory; Laser tuning; Optical coupling; Refractive index; Semiconductor lasers;

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/2944.401229

Filename

401229