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Proceedings Paper

Low-loss alignment-tolerant coupling from a GaAs/AlGaAs QW laser to a single-mode fiber
Author(s): Vijayanand Vusirikala; Badri Prasad Gopalan; Suryaprasad Kareenahalli; Mario Dagenais; Colin E. C. Wood; Dennis Stone; Yung Jui Chen
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Paper Abstract

We report on low-loss, alignment-tolerant coupling between a single quantum well GaAs/AlGaAs laser and a cleaved single mode fiber. The laser has been fabricated using conventional growth and processing techniques. The mode size in the transverse direction is expanded by using a diluted waveguide structure to better match the fiber mode size. The diluted waveguide was realized by reducing the Al mole fraction between the core and the cladding, thus providing weak confinement. Very small far field divergence angles (15 degree(s) (transverse) and 4.5 degree(s) (lateral)) were measured from this device, indicative of the expanded mode. A butt coupling efficiency of 70% was achieved against a theoretically possible 78%. In addition, large misalignment tolerances for a 1 dB excess loss of +/- 2 micrometers in the lateral and +/- 1.5 micrometers in the transverse directions, were measured. The To of the device was found to be 112 K, showing that the carrier leakage is not significant despite the diluted nature of the waveguide.

Paper Details

Date Published: 1 May 1996
PDF: 7 pages
Proc. SPIE 2690, Wavelength Division Multiplexing Components, (1 May 1996); doi: 10.1117/12.238909
Show Author Affiliations
Vijayanand Vusirikala, Univ. of Maryland/College Park (United States)
Badri Prasad Gopalan, Univ. of Maryland/College Park (United States)
Suryaprasad Kareenahalli, Univ. of Maryland/College Park (United States)
Mario Dagenais, Univ. of Maryland/College Park (United States)
Colin E. C. Wood, Univ. of Maryland/College Park (United States)
Dennis Stone, Univ. of Maryland/College Park (United States)
Yung Jui Chen, Univ. of Maryland/Baltimore (United States)

Published in SPIE Proceedings Vol. 2690:
Wavelength Division Multiplexing Components
Louis S. Lome, Editor(s)

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