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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 25, Iss. 5 — May. 1, 2007
  • pp: 1276–1283

Design and Application of Compact and Highly Tolerant Polarization-Independent Waveguides

Kerstin Wörhoff, Chris G. H. Roeloffzen, René M. de Ridder, Alfred Driessen, and Paul V. Lambeck

Journal of Lightwave Technology, Vol. 25, Issue 5, pp. 1276-1283 (2007)


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Abstract

In this paper, the design, fabrication, and application of a highly tolerant polarization-independent optical-waveguide structure suited for operation in the third communication window is presented. The waveguide structure has been optimized toward minimized sensitivity to technological tolerances and low fabrication complexity. The tolerance analysis has been based on the typical processing tolerances of the widely applied silicon-oxynitride technology, being ±3× 10-4 in refractive index, ±1% in thickness, and ±0.1μm in channel width. The optimized waveguide design fulfills the criterion of a channel birefringence within 5× 10-5, including processing tolerance. It also enables a fiber-to-chip coupling loss below 1 dB/facet and is suited for the realization of low-loss bends with a radius down to 600 µm. Based on this waveguide design, a passband-flattened optical wavelength filter with 50-GHz free spectral range has been realized and tested. The measured TE–TM shift of 0.03 nm confirms the polarization dependence of the optical waveguides being as low as 3 x 10-5.

© 2007 IEEE

Citation
Kerstin Wörhoff, Chris G. H. Roeloffzen, René M. de Ridder, Alfred Driessen, and Paul V. Lambeck, "Design and Application of Compact and Highly Tolerant Polarization-Independent Waveguides," J. Lightwave Technol. 25, 1276-1283 (2007)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-25-5-1276

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