Experimental and theoretical evaluation of the CW suppression of TE side modes in conventional 1.55 μm InP-InGaAsP distributed feedback lasers

Author

Ketelsen, Leonard J P ; Hoshino, Isako ; Ackerman, David A.

Author_Institution

AT&T Bell Lab., Murray Hill, NJ, USA

Volume

27

Issue

4

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

965

Lastpage

975

Abstract

A study is made of the factors that influence the suppression of the second TE Bragg mode in conventional 1.55 μm capped-mesa-buried-heterostructure distributed-feedback (CMBH-DFB) lasers. It is shown that the TE side-mode suppression becomes increasingly worse as the coupling of the optical mode to the grating ( kL) becomes larger, as expected from theoretical predictions. This degradation is not correlated to changes in the measured threshold gain margin, as obtained from spectral resonances. To explain the results, the authors introduce a new parameter-the threshold bias margin-which is a measure of the threshold difference between the lasing mode and the most prominent side mode

Keywords

III-V semiconductors; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser modes; laser transitions; semiconductor junction lasers; 1.55 micron; III-V semiconductors; InP-InGaAsP; capped mesa buried heterostructure distributed feedback lasers; continuous wave suppression; coupling; grating; lasing mode; optical mode; second TE Bragg mode; spectral resonances; theoretical evaluation; theoretical predictions; threshold bias margin; threshold gain margin; transverse electric side mode suppression; Distributed feedback devices; Gain measurement; Laser modes; Laser theory; Optical coupling; Optical distortion; Optical feedback; Optical fiber communication; Resonance; Tellurium;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.83331

Filename

83331