Title :
Limit of optical pulsewidth in the gain-switched DFB semiconductor laser
Author :
Cho, Seong-Dae ; Lee, Chang-Hee ; Shin, Sang-Yung
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
fDate :
7/1/1999 12:00:00 AM
Abstract :
We investigate the minimum optical pulsewidth that is obtainable in the gain-switched distributed-feedback semiconductor laser. The minimum obtainable optical pulsewidth is determined by either the period doubling or the saturation of modulation efficiency. The shift of the resonance frequency to the lower frequency side with increase of the modulation current brings about these phenomena. It is predicted theoretically that the minimum obtainable pulsewidth is about 0.2 times the period of the small-signal resonance. The minimum pulsewidth after compression with a dispersion compensating fiber is also discussed. Experimental measurements are in good agreement with the theory.
Keywords :
Q-switching; distributed feedback lasers; laser beams; laser feedback; optical pulse compression; optical pulse generation; optical saturation; semiconductor lasers; 15 C; 1553.5 nm; 5 GHz; 9 mA; compression; dispersion compensating fiber; gain-switched DFB semiconductor laser; gain-switched distributed-feedback semiconductor laser; minimum obtainable pulsewidth; minimum optical pulsewidth; minimum pulsewidth; modulation current; modulation efficiency; optical pulsewidth; period doubling; resonance frequency; saturation; small-signal resonance; Laser theory; Optical modulation; Optical pulses; Optical saturation; Pulse compression methods; Pulse modulation; Resonance; Resonant frequency; Semiconductor lasers; Space vector pulse width modulation;
Journal_Title :
Photonics Technology Letters, IEEE
