We demonstrate a novel tunable optical filter using cascaded Mach-Zehnder interferometers with apodized sampled gratings (ASGs). The ASGs are fabricated using an InGaAsP-InP deep-ridge waveguide with vertical-groove surface grating to obtain a high extinction ratio by sidelobe suppression. The proposed filter exhibits the total free-spectral range of 16 nm, an extinction ratio of 20 dB, and a 3-dB transmission bandwidth of 32 GHz.
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Segawa et al. (2004) studied this question.
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