Title :
Mechanism for high singlemode stability of gain-coupled DFB lasers with periodically etched quantum wells
Author_Institution :
Bell-Northern Res., Ottawa, Ont.
fDate :
8/31/1995 12:00:00 AM
Abstract :
The sidemode suppression ratio of gain-coupled DFB lasers with periodically etched quantum wells is analysed by a more accurate model for amplified spontaneous emission. It is shown that the periodic etching of quantum wells is very effective for providing a high side-mode suppression. The mechanism for the high singlemode stability is explained by the effective modal gain. which has an enhancement at the longer wavelength side of the Bragg stopband
Keywords :
distributed feedback lasers; etching; laser modes; laser stability; quantum well lasers; superradiance; Bragg stopband; amplified spontaneous emission; gain-coupled DFB lasers; modal gain; periodic etching; quantum wells; sidemode suppression ratio; singlemode stability;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19951088
