Title :
GaAs-AlGaAs QW diluted waveguide laser with low-loss, alignment-tolerant coupling to a single-mode fiber
Author :
Vusirikala, V. ; Gopalan, B.P. ; Kareenahalli, S. ; Merritt, S.A. ; Dagenais, M. ; Wood, C.E.C. ; Stone, D.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
We report on low-loss, alignment-tolerant coupling between a single-quantum-well (SQW) GaAs-AlGaAs laser and a cleaved single-mode fiber. The laser was fabricated using conventional growth and processing techniques, and did not involve any regrowth. The mode size in the transverse direction was expanded by using a diluted waveguide structure. A butt-coupling efficiency of 66% was achieved against a theoretically possible 78% (which does not correct for Fresnel losses). In addition, large alignment tolerances for a 1-dB excess loss of /spl plusmn/2.0 pm and /spl plusmn/1.0 μm were measured in the lateral and the transverse directions, respectively.
Keywords :
III-V semiconductors; aluminium compounds; gallium arsenide; laser modes; optical communication equipment; optical fabrication; optical fibre couplers; optical losses; quantum well lasers; waveguide lasers; 1 dB; 66 percent; 78 percent; Fresnel losses; GaAs-AlGaAs; GaAs-AlGaAs QW diluted waveguide laser; GaAs-AlGaAs laser; alignment-tolerant coupling; butt-coupling efficiency; cleaved single-mode fiber; diluted waveguide structure; excess loss; large alignment tolerances; lateral directions; low-loss; mode size; single-mode fiber coupling; single-quantum-well; transverse direction; transverse directions; Fiber lasers; Integrated circuit technology; Laser beams; Laser modes; Laser theory; Optical coupling; Optical fiber devices; Optical waveguides; Pump lasers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
