Title :
Effect of linear gain saturation on small-signal dynamics of MQW DFB lasers
Author :
Hong, J. ; Huang, W.P. ; Makino, T.
Author_Institution :
Adv. Technol. Lab., Bell-Northern Res., Ottawa, Ont., Canada
Abstract :
The linear gain saturation effect is shown to be important in determining the dynamics of multiple-quantum-well (MQW) distributed-feedback (DFB) lasers. A more realistic logarithmic dependence of material gain on carrier density is assumed in a comprehensive MQW DFB laser model. It is found through simulation that because of the linear gain saturation, the interplay between modal gain and differential gain leads to an optimal kappa L for maximum small-signal modulation bandwidth in lambda /4-shifted MQW DFB lasers.<>
Keywords :
carrier density; distributed feedback lasers; laser theory; optical modulation; optical saturation; semiconductor lasers; MQW DFB laser model; carrier density; differential gain; linear gain saturation; modal gain; multiple-quantum-well distributed-feedback lasers; simulation; small-signal dynamics; small-signal modulation bandwidth; Distributed feedback devices; Electrons; Frequency modulation; Gain; Laser feedback; Laser modes; Laser theory; Optical materials; Quantum well devices; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
