Dephased index and gain coupling in distributed feedback lasers

Author

Cardimona, D.A. ; Sharma, M.P. ; Kovanis, V. ; Gavrielides, A.

Author_Institution

Passive Sensors Branch, Air Force Phillips Lab., Kirtland AFB, NM, USA

Volume

31

Issue

1

fYear

1995

fDate

1/1/1995 12:00:00 AM

Firstpage

60

Lastpage

66

Abstract

In this paper, we study the reflection coefficient of a periodic Bragg reflecting structure in which there exists both an index-of-refraction grating as well as a gain grating. Most past studies have assumed that these two gratings were in phase with each other. In the present work we investigate the effects that arise when a phase shift is purposely introduced between the two gratings. We use a normal coupled-wave analysis to calculate the reflection coefficient as a function of the detuning away from the Bragg frequency when this grating phase difference is varied from 0 to 2π. We find particular phase difference values for which essentially a single-line reflection coefficient results, which in turn should produce narrow-band, single-mode operation of any device utilizing this Bragg structure for distributed feedback purposes

Keywords

coupled mode analysis; diffraction gratings; distributed feedback lasers; laser feedback; laser modes; laser theory; refractive index; semiconductor lasers; Bragg frequency; Bragg structure; coupled-wave analysis; dephased index coupling; detuning; distributed feedback; distributed feedback lasers; gain coupling; gain grating; grating phase difference; index-of-refraction grating; narrow-band single-mode operation; periodic Bragg reflecting structure; phase shift; reflection coefficient; single-line reflection coefficient; Distributed feedback devices; Frequency; Gratings; High speed optical techniques; Laser feedback; Laser modes; Optical coupling; Optical feedback; Optical reflection; Semiconductor lasers;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.341708

Filename

341708