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Proceedings Paper

Insertion loss reduction in high-speed polymer electro-optic modulators using tapered waveguide, fiber tip lenses, and modification of waveguide structures
Author(s): De Yu Zang; Golden Shu; Travis Downing; Weiping Lin; Choon Oh; James H. Bechtel
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Paper Abstract

Optical insertion loss improvement is needed for high-speed, electrooptic polymer waveguide modulators. The insertion loss is mainly attributed to fiber end-coupling loss caused by mode mismatch between the fiber and the polymer waveguide. Three approaches of reducing end-coupling loss have been pursued: tapered waveguides, fiber tip lenses and modification of the waveguide structure. Tapered waveguides can be accomplished using Reactive Ion Etching (RIE) and shadow or gray-scale mask techniques. Experimental results have shown that the best coupling loss improvement up to 3 dB per end-coupling can be achieved by tapered waveguide. Fiber tip lens technique has been currently investigated for improving end-coupling loss. Preliminary testing results using fiber tip lenses have been encouraging showing a 1.5 - 3.5 dB improvement per end-coupling. The fiber tip lens technique provides a reliable and repeatable approach for loss reduction for high-speed polymer modulators. Modifying a highly asymmetric rib waveguide to a symmetric buried channel waveguide will greatly improve coupling efficiency.

Paper Details

Date Published: 14 July 2003
PDF: 9 pages
Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); doi: 10.1117/12.475446
Show Author Affiliations
De Yu Zang, IPITEK, Inc. (United States)
Golden Shu, Teledyne Electronic Technologies (United States)
Travis Downing, IPITEK, Inc. (United States)
Weiping Lin, IPITEK, Inc. (United States)
Choon Oh, IPITEK, Inc. (United States)
James H. Bechtel, IPITEK, Inc. (United States)

Published in SPIE Proceedings Vol. 4991:
Organic Photonic Materials and Devices V
James G. Grote; Toshikuni Kaino, Editor(s)

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