Title :
InP-based multiple quantum well lasers with an integrated tapered beam expander waveguide
Author :
Ben-Michael, R. ; Koren, U. ; Muller, B.I. ; Young, G. ; Chien, M. ; Raybon, G.
Author_Institution :
AT&T Bell Labs., Holmdel, NJ, USA
Abstract :
We demonstrate the integration of a laterally tapered adiabatic mode expander waveguide inside the cavity of diode lasers operating at 1.3 and 1.55 μm wavelengths. This integration results in narrow output beam divergence with FWHM of 70 and 50 vertically and laterally respectively. The loss caused by the passive waveguide is minor and for devices operating at 1.55 (1.3) μm threshold currents as low as 12 (22) mA and quantum efficiencies as high as 52% (51%) are obtained. Coupling to a cleaved optical fiber yields broad alignment tolerance with 1 dB excess loss for misalignment of /spl plusmn/2.6 μm vertically and /spl plusmn/3.1 μm laterally, with a minimum coupling loss of -3.5 dB.
Keywords :
III-V semiconductors; indium compounds; laser cavity resonators; laser modes; optical fibre couplers; optical losses; quantum well lasers; waveguide lasers; 1.3 mum; 1.55 mum; 12 mA; 22 mA; 3.5 dB; 51 percent; 52 percent; InP; InP-based multiple quantum well lasers; broad alignment tolerance; cleaved optical fiber coupling; diode laser cavity; excess loss; integrated tapered beam expander waveguide; laterally tapered adiabatic mode expander waveguide; minimum coupling loss; misalignment; narrow output beam divergence; passive waveguide; quantum efficiencies; threshold currents; Diode lasers; Laser beams; Laser modes; Optical coupling; Optical fiber losses; Optical losses; Optical waveguides; Quantum well lasers; Threshold current; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
