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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 16, Iss. 9 — Sep. 1, 1998
  • pp: 1680–

A Very Short Planar Silica Spot-Size Converter Using a Nonperiodic Segmented Waveguide

Michael M. hler, Bert J. Offrein, Gian-Luca Bona, Roland Germann, Ilana Massarek, and Daniel Erni

Journal of Lightwave Technology, Vol. 16, Issue 9, pp. 1680- (1998)

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To reduce the coupling loss of a fiber-to-ridge waveguide connection, a planar silica spot-size converter for a wavelength of 1.55 \mum is implemented in the form of a nonperiodic segmented waveguide structure with irregular tapering. A simple single-step lithography process is sufficient for the fabrication of the planar structures. An evolutionary algorithm has been successfully applied for the optimization. The simulated results obtained with a three-dimensional (3-D) finite difference beam propagation method (FD-BPM) program are compared with measurements of implemented couplers, showing very good agreement. A waveguide-to-fiber coupling efficiency improvement exceeding 2 dB per converter is shown. Structures obtained with this approach are very short ({\sim}140\;\mum) and simple to integrate on the same wafer with other planar structures such as phased arrays or ring resonator structures.


Michael M. hler, Bert J. Offrein, Gian-Luca Bona, Roland Germann, Ilana Massarek, and Daniel Erni, "A Very Short Planar Silica Spot-Size Converter Using a Nonperiodic Segmented Waveguide," J. Lightwave Technol. 16, 1680- (1998)

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  1. G. Wenger, L. Stoll, B. Weiss, M. Schienle, R. Muller-Nawrath, S. Eichinger, J. Muller, B. Acklin, and G. Muller, "Design and fabrication of monolithic optical spot size transformers (MOST's) for highly efficient fiber-chip coupling," J. Lightwave Technol., vol. 12, pp. 1782-1790, Oct. 1994.
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