Title :
Integration of semiconductor laser amplifiers with sampled grating tunable lasers for WDM applications
Author :
Lee, San-Liang ; Heimbuch, Mark E. ; Cohen, Daniel A. ; Coldren, Larry A. ; DenBaars, Steven P.
Author_Institution :
Dept. of Electron. Eng., Nat. Taiwan Inst. of Technol., Taipei, Taiwan
fDate :
4/1/1997 12:00:00 AM
Abstract :
A semiconductor laser amplifier is integrated with a sample grating distributed Bragg reflector (SGDBR) laser to act as an external modulator. The fabrication, characterization, and device characteristics of this integrated tunable transmitter are reported. The integrated tunable laser can have up to 75 nm of tuning range and more than 30 dB of side-mode suppression ratio (SMSR). The integrated amplifier can provide at most 8 dB of gain and more than 25 dB of contrast ratio for all the channels. Its RF modulation bandwidth can achieve 1.5 GHz, and the dynamic chirp is as good as a directly modulated laser. A simple model is proposed to explain the measured modulation responses and gain saturation is found to be the main cause of the resonant peaks in the dynamics
Keywords :
chirp modulation; diffraction gratings; distributed Bragg reflector lasers; electro-optical modulation; integrated optics; laser modes; laser theory; laser tuning; optical transmitters; quantum well lasers; semiconductor device models; wavelength division multiplexing; 1.5 GHz; RF modulation bandwidth; WDM; WDM applications; contrast ratio; device characteristics; directly modulated laser; dynamic chirp; external modulator; gain saturation; integrated tunable laser; integrated tunable transmitter; modulation responses; optical transmitters; resonant peaks; sample grating distributed Bragg reflector; sampled grating tunable lasers; semiconductor laser amplifiers; side-mode suppression ratio; strained MQW lasers; tuning range; Bragg gratings; Chirp modulation; Distributed Bragg reflectors; Distributed amplifiers; Laser tuning; Optical device fabrication; Semiconductor lasers; Semiconductor optical amplifiers; Transmitters; Tunable circuits and devices;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.605713
