Title :
A GaInAsP/InP tapered-waveguide semiconductor laser amplifier integrated with a 1.5 mu m distributed feedback laser
Author :
Yazaki, Paulo A. ; Komori, Kazuhiro ; Bendelli, Giampaolo ; Arai, Shigehisa ; Suematsu, Yasuharu
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan
Abstract :
A GaInAsP/InP index-guided type tapered-waveguide traveling-wave semiconductor laser amplifier (TTW-SLA) with exponential taper structure was realized for the first time and its integration with a 1.5 mu m wavelength phase adjusted DFB laser was demonstrated. A reasonable amount of the single-pass gain, which was limited by the residual reflectivity at the output end of the amplifier region, was obtained with no serious problem with the lasing spectrum. A narrow beam divergence of FWHM=5.5 degrees and stable longitudinal mode operation were obtained with the output waveguide width of 20 mu m by adopting both a window structure and 7 degrees angled facets. This value agrees well with the theoretically calculated one and proves that single transverse-mode propagation can be attained by an exponentially tapered TTW-SLA with a very wide output end.<>
Keywords :
III-V semiconductors; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; integrated optoelectronics; laser modes; optical waveguides; semiconductor junction lasers; 1.5 micron; 20 micron; GaInAsP-InP; angled facets; distributed feedback laser; exponential taper structure; integrated optics; lasing spectrum; narrow beam divergence; output end; residual reflectivity; single transverse-mode propagation; single-pass gain; stable longitudinal mode operation; tapered-waveguide semiconductor laser amplifier; traveling-wave; waveguide width; wavelength phase adjusted DFB laser; window structure; Distributed amplifiers; Distributed feedback devices; Indium phosphide; Laser feedback; Optical amplifiers; Optical waveguides; Reflectivity; Semiconductor lasers; Semiconductor optical amplifiers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
