Abstract

We propose and demonstrate a multistage design for microphotonic add–drop filters that provides reduced drop-port loss and relaxed tolerances for achieving high in-band extinction. As a result, the first microring-resonator filters with a rectangular notch stopband in the through port (to our knowledge) are shown, with extinctions exceeding 50dB. Reaching 30dB beyond previous results, without postfabrication trimming, such extinction levels open the door to microphotonic notch circuits for spectroscopy, wavelength conversion, and quantum cryptography applications. Combined with a low-loss, high-index-contrast electromagnetic design in SiN and frequency-matched microring resonators, this approach led to the first demonstration of flattop microphotonic filters meeting the stringent criteria for high-spectral-efficiency integrated add–drop multiplexers. The 40GHz wide filters show a 20nm free spectral range, 2dB drop loss, and suppression of adjacent channels by over 30dB.

© 2006 Optical Society of America

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