Title :
Stability of the longitudinal mode in λ/4-shifted InGaAsP/InP DFB lasers
Author :
Okai, Makoto ; Tsuji, Shinji ; Chinone, Naoki
Author_Institution :
Hitachi Ltd., Tokyo, Japan
fDate :
6/1/1989 12:00:00 AM
Abstract :
Factors causing the mode stability of λ/4-shifted distributed-feedback (DFB) lasers, spatial hole burning along the laser axis and residual reflectivity of the facets of laser cavity, are studied. It is experimentally and theoretically confirmed that the spatial hole burning increases the corrugation phase shift from λ/4 (π) to 3λ/8 (1.5 π) as the driving current increases in lasers whose coupling constant and cavity-length product kL is 2.0. This hole-burning effect requires the reflectivity of facets to be reduced below 0.2% to get a high reproducibility of lasers oscillating at a stable single mode up to high output powers
Keywords :
III-V semiconductors; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser modes; optical hole burning; reflectivity; semiconductor junction lasers; InGaAsP-InP; corrugation phase shift; coupling constant; driving current; lambda/4 shifted DFB laser; laser cavity facets; longitudinal mode stability; residual reflectivity; spatial hole burning; Corrugated surfaces; Distributed feedback devices; Indium phosphide; Laser feedback; Laser modes; Laser stability; Laser theory; Optical coupling; Power generation; Power lasers; Reflectivity; Reproducibility of results; Substrates;
Journal_Title :
Quantum Electronics, IEEE Journal of
