Title :
Tunable stabilized single-frequency GRINROD external coupled cavity semiconductor lasers
Author :
Zhang, Jianping ; Ye, Peida ; Xie, Yi ; Tao, Shangping
Author_Institution :
Dept. of Electron. Eng., Southeast Univ., Nanjing, China
fDate :
10/1/1990 12:00:00 AM
Abstract :
A computer simulation based on the modified mode-selection theory of the semiconductor laser with graded index-rod external coupled cavity (GRECC) is presented. It is found that the graded-index-rod (GRINROD) external coupled cavity improves the side-mode suppression greatly, and any displacement of the GRINROD with respect to the laser chip degrades optical coupling, thus reducing side-mode suppression. The tunable GRECC laser diode is presented. A tuning range of over 11 nm and side-mode suppression better than 35 dB have been obtained. Long-term center frequency fluctuations and drift of less than 2 MHz are achieved by frequency locking the GRECC laser diode to NH3 absorption lines. A demonstration of its use in a frequency shift keying heterodyne experimental transmission system indicates that the tunable GRECC laser diode is a promising light source for coherent optical-fiber communication
Keywords :
gradient index optics; laser cavity resonators; laser frequency stability; laser modes; laser theory; laser tuning; semiconductor junction lasers; NH3 absorption lines; center frequency fluctuations; coherent optical-fiber communication; computer simulation; coupled cavity semiconductor lasers; frequency locking; frequency shift keying heterodyne experimental transmission system; graded index-rod external coupled cavity; laser chip; light source; modified mode-selection theory; semiconductor laser; side-mode suppression; tunable GRECC laser diode; tuning range; Computer simulation; Diode lasers; Frequency; Laser mode locking; Laser modes; Laser theory; Laser tuning; Optical coupling; Semiconductor lasers; Tunable circuits and devices;
Journal_Title :
Lightwave Technology, Journal of
