Tunable optical filter with variable bandwidth based on Vernier-cascade second-order microring resonators

Haoyan Wang; Lei Zhang; Jincheng Dai; Xin Fu; Lin Yang

doi:10.1117/12.2518284

14 February 2019 Tunable optical filter with variable bandwidth based on Vernier-cascade second-order microring resonators

Haoyan Wang, Lei Zhang, Jincheng Dai, Xin Fu, Lin Yang

Author Affiliations +

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 110482L (2019) https://doi.org/10.1117/12.2518284
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

We propose and demonstrate an integrated optical filter with variable bandwidth and tunable central wavelength. It consists of two stages of second-order microring resonators with different radiuses. The two stages are serially cascaded, with each stage having a flat-top spectrum. The free spectral range (FSR) of the cascaded structure is expanded via the Vernier effect. The central wavelength of the proposed optical filter is tuned by synchronous tuning of the two stages. The 3dB bandwidth is adjusted via intentional misalignment of the passbands of the two stages. We demonstrate a prototype of such an optical filter on the silicon-on-insulator platform. The radiuses of ring cavities in the two stages are 7 μm and 10 μm, respectively. All the four ring cavities can be thermally tuned independently. The FSR of the fabricated device is around 90 nm. We show the tuning of the central wavelength from 1460 nm to 1550 nm. We adjust the 3dB bandwidth from 37.5 GHz to 100 GHz with a step of 12.5 GHz, with the insertion loss varying from -5.4 dB to -7.9 dB. Keywords: Integrated optics devices, wavelength filtering devices, coupled resonators

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Haoyan Wang, Lei Zhang, Jincheng Dai, Xin Fu, and Lin Yang "Tunable optical filter with variable bandwidth based on Vernier-cascade second-order microring resonators", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110482L (14 February 2019); https://doi.org/10.1117/12.2518284

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KEYWORDS

Optical filters

Resonators

Microrings

Waveguides

Silicon

Integrated optics

Wavelength division multiplexing

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