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Proceedings Paper

Design of a single mesa vertical coupler
Author(s): Chee-Wei Lee; Shuh-Ying Lee; Mee-Koy Chin
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Paper Abstract

A new design of vertical coupler (VC) based on only a single mesa is presented. The newly proposed vertical coupler has the potential of improving the fabrication yield, as it requires much simpler fabrication process. The vertical coupler comprises a large underlying rib waveguide to which light is coupled. The lower waveguide is formed by the loading effect provided by the smaller upper ridge waveguide. The upper ridge waveguide contains the actual device (e.g. modulator or photodetector) and is tapered in a way to maximize the vertical transfer of light from the lower waveguide, and thus the vertical coupler can be used as a spot-size converter (SSC) between a single-mode fiber and the actual device. We investigate the transfer efficiency of the single-mesa vertical coupler with different configurations. The single-mesa design is found to give a lower total loss (i.e., fiber coupling loss plus transfer loss) compared with direct coupling to the actual device. The transfer efficiencies obtained are more than 90% for both TE and TM polarizations, and are polarization independent.

Paper Details

Date Published: 8 September 2006
PDF: 5 pages
Proc. SPIE 6343, Photonics North 2006, 63431B (8 September 2006); doi: 10.1117/12.707718
Show Author Affiliations
Chee-Wei Lee, Nanyang Technological Univ. (Singapore)
Shuh-Ying Lee, Nanyang Technological Univ. (Singapore)
Mee-Koy Chin, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 6343:
Photonics North 2006
Pierre Mathieu, Editor(s)

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