Title :
Above-threshold analysis of three-section DFB/DBR lasers with second-order gratings
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong
fDate :
6/1/1995 12:00:00 AM
Abstract :
An above-threshold static analysis has been performed on a three-section DFB/DBR laser with a continuous second-order grating. The laser has a center pumped section that is terminated by two unpumped grating sections. The results confirm earlier experimental observation that the laser operates with a peaked nearfield intensity distribution along the laser cavity. The values of the grating parameters and the active-section-to-total-cavity-length ratio associated with this mode of operation are obtained. They indicate good tolerance in these design parameters. The DFB/DBR laser is also found to have reduced longitudinal spatial hole burning and a smaller effective linewidth enhancement factor compared with a uniformly pumped single-section, second-order DFB laser. The introduction of asymmetry in the DFB/DBR laser results in poorer side-mode suppression compared with the symmetric DFB/DBR laser
Keywords :
diffraction gratings; distributed Bragg reflector lasers; distributed feedback lasers; laser accessories; laser cavity resonators; laser feedback; optical hole burning; optical pumping; semiconductor lasers; DFB/DBR lasers; above-threshold static analysis; active-section-to-total-cavity-length ratio; design parameters; distributed feedback/distributed Bragg reflector laser; grating parameters; laser cavity; longitudinal spatial hole burning; nearfield intensity distribution; operation mode; second-order DFB laser; second-order gratings; side-mode suppression; Distributed Bragg reflectors; Gratings; Laser excitation; Laser modes; Laser stability; Optical coupling; Optical surface waves; Optical waveguides; Pump lasers; Waveguide lasers;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.401216
