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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 22,
  • Issue 7,
  • pp. 1828-
  • (2004)

Mirror Quality and the Performance of Reflective Arrayed-Waveguide Grating Multiplexers

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Abstract

This paper discusses an investigation of the effects of mirror quality on the performance of reflecting arrayed-waveguide-grating multiplexers. Using specially designed external mirrors as external reflectors, the optimum flatness and microroughness of the reflecting surface are determined. The experiments discussed in the paper indicate that a reflecting-surface flatness of lambda/4 is sufficient to obtain high-performance reflective multiplexers. Extrinsic mirror-related phase and intensity errors were found to be negligible for surfaces polished with diamond lapping films with a grain size smaller than 1 µm. These experimental results were found to be in excellent agreement with simulations based on mirror-related changes in the waveguide-grating-length increment.

© 2004 IEEE

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