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Dong, Po; Feng, Ning-Ning; Feng, Dazeng; Qian, Wei; Liang, Hong; Lee, Daniel C; Luff, B J; Banwell, T; Agarwal, A; Toliver, P; Menendez, R; Woodward, T K; Asghari, Mehdi
Optics express, 11/2010, Letnik: 18, Številka: 23Journal Article
Previously demonstrated high-order silicon ring filters typically have bandwidths larger than 100 GHz. Here we demonstrate 1-2 GHz-bandwidth filters with very high extinction ratios (~50 dB). The silicon waveguides employed to construct these filters have propagation losses of ~0.5 dB/cm. Each ring of a filter is thermally controlled by metal heaters situated on the top of the ring. With a power dissipation of ~72 mW, the ring resonance can be tuned by one free spectral range, resulting in wavelength-tunable optical filters. Both second-order and fifth-order ring resonators are presented, which can find ready application in microwave/radio frequency signal processing.
