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Fast tunable optical filter using cascaded Mach-Zehnder Interferometers with apodized sampled gratings

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6 Author(s)
Segawa, T. ; NTT Photonics Labs., NTT Corp., Kanagawa, Japan ; Matsuo, S. ; Ohiso, Y. ; Ishii, T.
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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.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 1 )