Title :
Distributed feedback lasers with an S-bent waveguide for high-power single-mode operation
Author :
Salzman, Joseph ; Olesen, Henning ; Moller-Larsen, Anders ; Albrektsen, Ole ; Hanberg, Jesper ; Norregaard, Jesper ; Jonsson, Bjorn ; Tromborg, Bjarne
Author_Institution :
Tele Danmark Res., Horsholm, Denmark
fDate :
6/1/1995 12:00:00 AM
Abstract :
DFB lasers with variations in the Bragg wavenumber along the cavity (corrugation-pitch modulation) can be designed to operate in a single mode up to high output powers. Practical implementation of various pitch-modulated DFB cavities is facilitated by bending the laser waveguide over a uniform grating, so that the Bragg wavenumber is varied along the cavity. In this paper, above-threshold behavior of such lasers is studied, and design rules for high power single-mode operation are developed. S-bent waveguide DFB lasers, fabricated according to our design criteria, exhibit single-mode operation with 40 dB side mode suppression ratio from threshold to 10×Ith
Keywords :
diffraction gratings; distributed feedback lasers; laser accessories; laser beams; laser cavity resonators; laser feedback; laser modes; optical design techniques; optical modulation; quantum well lasers; waveguide lasers; Bragg wavenumber; DFB cavities; S-bent waveguide; above-threshold behavior; cavity; corrugation-pitch modulation; design criteria; design rules; distributed feedback lasers; high output powers; high power single-mode operation; high-power single-mode operation; laser waveguide; side mode suppression ratio; uniform grating; Bragg gratings; Degradation; Distributed feedback devices; Laser feedback; Laser modes; Manufacturing; Optical design; Power generation; Power lasers; Waveguide lasers;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.401214
