Title :
Single-mode operation of a surface grating distributed feedback GaAs-AlGaAs laser with variable-width waveguide
Author :
Abe, H. ; Ayling, S.G. ; Marsh, J.H. ; RUE, R. M DE LA ; Roberts, J.S.
Author_Institution :
Dept. of Electron. & Electr. Eng., Glasgow Univ., UK
fDate :
5/1/1995 12:00:00 AM
Abstract :
Single-mode distributed feedback laser operation can be achieved by introducing an appropriate phase jump within the feedback grating, causing lasing to occur within the stop-band. One possible approach involves variation of the waveguide stripe width in an index-guided structure, in conjunction with a grating of uniform periodicity. If the phase change is allowed to accumulate over a sufficient length of the width perturbed stripe waveguide, a /spl lambda//4 shift can be realized. We report the first laser of this type using a surface grating structure with only postgrowth processing.<>
Keywords :
III-V semiconductors; aluminium compounds; diffraction gratings; distributed feedback lasers; gallium arsenide; laser modes; refractive index; semiconductor lasers; waveguide lasers; /spl lambda//4 shift; GaAs-AlGaAs; GaAs-AlGaAs laser; feedback grating; index-guided structure; phase change; phase jump; postgrowth processing; single-mode distributed feedback laser operation; single-mode operation; stop-band lasing; surface grating distributed feedback; surface grating structure; uniform periodicity; variable-width waveguide; waveguide stripe width; width perturbed stripe waveguide; Bragg gratings; Distributed feedback devices; Holography; Laser feedback; Laser modes; Optical surface waves; Optical waveguides; Surface emitting lasers; Waveguide lasers; Waveguide transitions;
Journal_Title :
Photonics Technology Letters, IEEE
