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GaAs-AlGaAs QW diluted waveguide laser with low-loss, alignment-tolerant coupling to a single-mode fiber

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7 Author(s)
Vusirikala, V. ; Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA ; Gopalan, B.P. ; Kareenahalli, S. ; Merritt, S.A.
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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 /spl mu/m were measured in the lateral and the transverse directions, respectively.

Published in:

Photonics Technology Letters, IEEE  (Volume:8 ,  Issue: 9 )

Date of Publication:

Sept. 1996

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