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Proceedings Paper

1.55-μm mode expander using single epitaxial growth
Author(s): Mario Dagenais; Simarjeet S. Saini; Vijayanand Vusirikala; Robert E. Bartolo; Ralph D. Whaley; F. G. Johnson; Dennis Stone
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Paper Abstract

We report on two techniques developed at the University of Maryland, College Park for fabricating expanded mode laser arrays. Both of these techniques use single epitaxial growth and conventional fabrication techniques. The first of these techniques is based on adiabatic mode transformation from a tightly confined active waveguide to a loosely confined large underlying passive waveguide over a mode transmission region 500 micrometers long. The devices butt couple to a standard single mode fiber with a coupling loss of 3.6 dB and reduced farfield divergence angles of 22 degree(s) and 9 degree(s) in the transverse and lateral directions respectively. The excess mode transformation loss is 1.3 dB. The second device is based on a novel resonant coupling scheme between two waveguides of different dimensions and refractive indices. The mode is transformed over a taper length of 200 micrometers with excess mode transformation loss of 0.6 dB. Butt coupling efficiencies of 41% (3.8 dB coupling loss) is achieved to a standard single mode fiber. The farfield divergence angles achieved are 24 degree(s) and 13 degree(s) in the transverse and lateral directions respectively.

Paper Details

Date Published: 4 December 1998
PDF: 10 pages
Proc. SPIE 3491, 1998 International Conference on Applications of Photonic Technology III: Closing the Gap between Theory, Development, and Applications, (4 December 1998); doi: 10.1117/12.328754
Show Author Affiliations
Mario Dagenais, Univ. of Maryland/College Park (United States)
Simarjeet S. Saini, Univ. of Maryland/College Park (United States)
Vijayanand Vusirikala, Univ. of Maryland/College Park (United States)
Robert E. Bartolo, Univ. of Maryland/College Park (United States)
Ralph D. Whaley, Univ. of Maryland/College Park (United States)
F. G. Johnson, Univ. of Maryland/College Park (United States)
Dennis Stone, Univ. of Maryland/College Park (United States)


Published in SPIE Proceedings Vol. 3491:
1998 International Conference on Applications of Photonic Technology III: Closing the Gap between Theory, Development, and Applications
George A. Lampropoulos; Roger A. Lessard, Editor(s)

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