Title :
Chirp and stability of mode-locked semiconductor lasers
Author :
Schell, M. ; Tsuchiya, M. ; Kamiya, T.
Author_Institution :
Dept. of Electron. Eng., Tokyo Univ., Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
A numerical study of mode-locked semiconductor lasers is presented with special attention to the chirp characteristics and to dispersion-related criteria for stable pulse-train emission. The dependence of the pulse chirp upon the refractive-index change, both with carrier density and carrier temperature changes, is discussed. The experimental observation of blue-chirped pulses for passive mode-locking in contrast to red-chirped pulses for active mode-locking is found to be due to the different contributions of gain and absorber media to the refractive-index change. In addition, it is revealed that the boundary of the stable operation regime is critically influenced by the spectral characteristics of laser and external cavity. Design considerations toward the achievement of high pulse energy, narrow spectral bandwidth, and linear chirp are given
Keywords :
carrier density; chirp modulation; laser cavity resonators; laser mode locking; laser stability; laser theory; optical modulation; refractive index; semiconductor lasers; spectral line breadth; absorber media; active mode-locking; blue-chirped pulses; carrier density; carrier temperature changes; chirp; chirp characteristics; design considerations; dispersion-related criteria; external cavity; high pulse energy; linear chirp; mode-locked semiconductor laser stability; narrow spectral bandwidth; numerical study; passive mode-locking; pulse chirp; red-chirped pulses; refractive-index change; spectral characteristics; stable operation regime; stable pulse-train emission; Chirp; Laser mode locking; Laser stability; Laser theory; Optical pulse generation; Optical pulses; Optical refraction; Pulse compression methods; Pulse measurements; Semiconductor lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
