Title :
Dynamic mode stability in gain-switched quarter wave shifted distributed feedback lasers
Author :
Tsuji, Shinji ; Okai, Makoto ; Nakano, Hiroyuki ; Chinone, Naoki ; Choy, Michael M.
Author_Institution :
Hitachi Ltd., Tokyo, Japan
fDate :
6/1/1989 12:00:00 AM
Abstract :
The dynamic single-mode stability of 1.5-μm quarter-wave-shifted distributed-feedback lasers is compared to that of conventional distributed feedback lasers by measuring the time-averaged spectra under gain switching. The experimentally observed relation between the threshold gain difference and the peak intensity ratio in the spectra is well explained by the analysis based on rate equations. The measurements show that quarter-wave-shifted lasers exhibit superior single-mode stability, and their threshold (field) gain difference between main modes and submodes is estimated to exceed 8 cm-1
Keywords :
III-V semiconductors; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser modes; semiconductor junction lasers; 1.5 micron; InGaAsP-InP; dynamic single-mode stability; gain switching; gain-switched quarter wave shifted distributed feedback lasers; peak intensity ratio; rate equations; threshold gain difference; time-averaged spectra; Communication switching; Difference equations; Distributed feedback devices; Gain measurement; Laser feedback; Laser modes; Laser stability; Optical pulses; Optical waveguides; Semiconductor lasers; Springs; Waveguide lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
