Title :
Effective-index matrix analysis of distributed feedback semiconductor lasers
Author :
Makino, Toshihiko
Author_Institution :
Bell-Northern Research Ltd., Ottawa, Ont., Canada
fDate :
2/1/1992 12:00:00 AM
Abstract :
A method is developed for calculating the threshold gain in distributed feedback (DFB) semiconductor lasers consisting of a four-layer waveguide. Each corrugation region is expressed by a transfer matrix comprising the complex effective index, and the threshold calculation is reduced to the matrix multiplication. It is found that a periodic variation of the effective gain and loss induced by the modulation of the optical confinement factors gives rise to the threshold gain difference between the two adjacent modes on both sides of the Bragg frequency in standard DFB lasers without facet reflections. The absorption loss in the guiding layer increases the amplitude of the gain modulation, resulting in the increase of the threshold gain difference
Keywords :
distributed feedback lasers; laser modes; laser theory; optical losses; optical modulation; optical waveguides; refractive index; semiconductor junction lasers; AM; Bragg frequency; DFB; absorption loss; adjacent modes; amplitude modulation; complex effective index; corrugation region; distributed feedback semiconductor lasers; effective gain; effective index matrix analysis; four-layer waveguide; gain modulation; guiding layer; laser gain; light absorption; matrix multiplication; optical confinement factors; optical loss; optical modulation; periodic variation; threshold gain; threshold gain difference; transfer matrix; Distributed feedback devices; Laser feedback; Optical feedback; Optical losses; Optical modulation; Optical waveguides; Semiconductor lasers; Semiconductor waveguides; Transmission line matrix methods; Waveguide lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
