Title :
Short-cavity distributed Bragg reflector laser with an integrated tapered output waveguide
Author :
Chien, M. ; Koren, U. ; Koch, T.L. ; Miller, B.I. ; Oron, M. ; Young, M.G. ; deMiguel, J.L.
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
fDate :
5/1/1991 12:00:00 AM
Abstract :
A distributed Bragg reflector strained-layer multiple-quantum-well laser at 1.5- mu m wavelength with an integrated tapered waveguide beam expander is discussed. The far-field FWHMs in the lateral and vertical directions are 10 and 15 degrees , respectively. A quantum efficiency of 17% out the tapered facet was measured with a corresponding threshold current of 28 mA. The alignment tolerances for coupling into a cleaved single-mode fiber are 9.5 and 7.5 mu m FWHM in the lateral and vertical directions, respectively. A 3-dB improvement for single-mode fiber coupling using a SELFOC lens was obtained.<>
Keywords :
distributed Bragg reflector lasers; integrated optics; integrated optoelectronics; laser transitions; optical waveguides; semiconductor junction lasers; semiconductor quantum wells; 1.5 micron; SELFOC lens; alignment tolerances; cleaved single-mode fiber; distributed Bragg reflector strained-layer multiple-quantum-well laser; far field full width haft maximums; integrated tapered output waveguide; integrated tapered waveguide beam expander; lateral directions; quantum efficiency; short cavity distributed Bragg reflector laser; single-mode fiber coupling; tapered facet; threshold current; vertical directions; Distributed Bragg reflectors; Etching; Fiber lasers; Gratings; Indium phosphide; Laser beams; Laser modes; Quantum well lasers; Semiconductor lasers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
