Narrowband tunable photonic notch filter

Abstract

We propose a technique for realization of a high-contrast, tunable, low-insertion-loss notch filter using polarization selectivity of whispering-gallery-mode resonators. We demonstrate a $10\mathrm{MHz}$ filter with $5.5\mathrm{dB}$ insertion loss and $45.5\mathrm{dB}$ of in-band rejection. The measured rejection value is limited by the finite $\left(3\mathrm{kHz}\right)$ linewidth of our laser. We show that the filter can potentially have tunable bandwidth without significant rejection modification.

© 2009 Optical Society of America

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