Analysis of a second-order polarization-independent filter made of a single ring resonator and a Sagnac interferometer |
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| Authors: | Fufei Pang Feng Liu Xiuyou Han Haiwen Cai Ronghui Qu Zujie Fang |
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| Affiliation: | Laboratory of Information Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, PR China |
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| Abstract: | A novel second-order polarization-independent filter made of a single ring resonator and a Sagnac interferometer (SRRSI) is proposed, and its filtering characteristics are investigated. By using birefringence in waveguide, a single ring resonator can be used to synthesize a filter with second-order response. Analytical formulas are derived for characteristics of the SRRSI varied with waveguide parameters, such as the coupling coefficient; and the critical condition of a second-order Butterworth filter is given. The influence of loss in the ring resonator is also analyzed. |
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| Keywords: | Integrated optics Optical ring resonator Optical waveguide |
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