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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 23,
  • Issue 12,
  • pp. 4207-
  • (2005)

Spotsize Converter With Improved Design for InP-Based Deep-Ridge Waveguide Structure

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Abstract

An efficient spotsize converter (SSC) is necessary for directly coupling an InP-based deep-ridge waveguide structure to a fiber. We have already proposed an SSC that uses a laterally buried taper, selectively grown over a thick cladding layer and an optimized deep-ridge-buried waveguide junction. The experimentally obtained converter loss was less than 2 dB, which is still large. Further optimization is possible by introducing a short taper waveguide for the deep-ridge-buried waveguide junctions and improving the taper shape by using a two-step linear taper with a short narrow waveguide. A simulation result shows that we can achieve a converter loss of less than 1 dB with a converter length of only 200µm.

© 2005 IEEE

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