An apodized sampled grating using a vertical-groove high-mesa waveguide structure

説明

We propose a fast tunable optical filter using an apodized sampled grating (ASG). A sampled grating (SG) structure that exhibits a comb-like filter response is introduced to obtain both a wide tuning range and easy control of transmission bandwidth. In addition, we apply apodization to the SG to achieve a high extinction ratio by suppressing the sidelobe of filter spectra. We fabricated an ASG using an InGaAsP/InP vertical-groove high-mesa waveguide structure for use in a tunable optical filter. The fabricated grating exhibited a comb-like filter response with a relatively wide transmission bandwidth of 52 GHz and a high extinction ratio of 15 dB.

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