DocumentCode
1032655
Title
Properties of quarter-wave-shifted DFB lasers in the presence of a taper
Author
Westbrook, L.D.
Author_Institution
British Telecom Research Laboratories, Ipswich, UK
Volume
23
Issue
10
fYear
1987
Firstpage
518
Lastpage
520
Abstract
The deleterious effect of a taper on the properties of quarterwave-shifted DFB lasers is analysed to assess the tolerance of these potentially useful single-frequency lasers to variations in epitaxial layer thickness, composition or in the DFB grating period. The maximum tolerable variation in any of these parameters is shown to be relatively insensitive to the grating coupling strength. The maximum tolerable thickness variation depends principally on the derivative of the laser waveguide effective index with respect to epilayer thickness and, for typical diode parameters, lies in the range 150¿1500 Å.
Keywords
diffraction gratings; distributed feedback lasers; laser modes; laser theory; optical waveguides; semiconductor junction lasers; 150 to 1500 Ã\x85; DFB grating period; DFB lasers; diode parameters; distributed feedback type; epilayer thickness; epitaxial layer taper; grating coupling strength; layer composition; maximum tolerable variation; quarter-wave-shifted; semiconductor lasers; single mode type; single-frequency lasers; waveguide effective index;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19870374
Filename
4257705
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