Title :
Variation of coupling coefficients by sampled gratings in complex coupled distributed-feedback lasers
Author :
Hansmann, S. ; Hillmer, H. ; Walter, H. ; Burkhard, H. ; Hübner, B. ; Kuphal, E.
Author_Institution :
Forschungs- und Technologiezentrum, Deutsche Bundespost Telekom, Darmstadt, Germany
fDate :
6/1/1995 12:00:00 AM
Abstract :
We present an efficient method for an almost arbitrary variation of the complex coupling coefficient of distributed feedback lasers by using superstructure gratings, As shown by detailed transfer matrix model calculations the coupling coefficient can be reduced locally according to the duty cycle of a sampled grating. The additional supermodes caused by the superstructure can be strongly suppressed by choosing a small superperiod so that the supermodes are shifted apart from the gain curve. This novel approach for the realization of nonuniform coupling coefficients is applied to analyze experimentally the influence of the complex coupling strength on the performance of loss coupled InGaAs-InGaAlAs-InP-DFB lasers
Keywords :
III-V semiconductors; aluminium compounds; diffraction gratings; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser accessories; laser feedback; optical couplers; optical losses; semiconductor lasers; DFB lasers; InGaAs-InGaAlAs-InP; InGaAs-InGaAlAs-InP laser; arbitrary variation; complex coupled distributed-feedback lasers; coupling coefficients; duty cycle; gain curve; loss coupled laser; nonuniform coupling coefficients; sampled grating; sampled gratings; supermodes; superstructure; superstructure gratings; transfer matrix model; Bragg gratings; Distributed feedback devices; Etching; Fiber lasers; Laser feedback; Laser modes; Optical coupling; Performance analysis; Performance loss; Semiconductor lasers;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.401213
