Title :
Effect of cross saturation on frequency fluctuations in a nearly single-mode semiconductor laser
Author :
Gray, George R. ; Agrawal, Govind P.
Author_Institution :
Inst. of Opt., Rochester Univ., NY, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
The effect of side-mode cross-saturation on the frequency noise of the main mode of a nearly-single-mode laser is investigated by considering the Langevin rate equations which contain the nonlinear gain with both the self-saturation and cross-saturation terms. When cross-saturation is stronger than self-saturation, the frequency noise of the main mode is found to be significantly enhanced in the low-frequency regime (<1 GHz). An increase of more than 20 dB is predicted due to a side mode suppressed by 15-20 dB. The enhanced frequency noise results in broadening of the laser linewidth and may affect the performance of coherent optical communication systems.<>
Keywords :
electron device noise; fluctuations; laser modes; laser theory; optical saturation; semiconductor junction lasers; 1 GHz; DFB diode lasers; Langevin rate equations; coherent optical communication systems; frequency fluctuations; frequency noise; laser linewidth broadening; laser modes; low-frequency regime; main mode; nearly single-mode semiconductor laser; nonlinear gain; self-saturation; side-mode cross-saturation; Fluctuations; Frequency; Laser modes; Laser noise; Low-frequency noise; Nonlinear equations; Optical fiber communication; Optical noise; Semiconductor device noise; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
