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Opt Lett. 2009 Nov 1;34(21):3292-4. doi: 10.1364/OL.34.003292.

Optical filter with very large stopband (approximately 300 nm) based on a photonic-crystal vertical-directional coupler.

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School of Physics and Astronomy, University of St Andrews, St Andrews, Fife, KY169SS, UK.


We have designed, fabricated, and demonstrated a vertical directional coupler based on the coupling between a polymer waveguide and a W1 photonic crystal waveguide. The filters have a bandwidth of approximately 2 nm within a stopband of Delta lambda approximately 300 nm and an on-chip insertion loss of 1 dB. This is the first (to our knowledge) demonstration of a filter with such a large stopband that overcomes the bandwidth limitation of existing filters.

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