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17 January 2011 SOI ring resonators with controllable MMI coupler sections
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Proceedings Volume 7943, Silicon Photonics VI; 794311 (2011) https://doi.org/10.1117/12.887692
Event: SPIE OPTO, 2011, San Francisco, California, United States
Abstract
A ring resonator using a single 2×2 MMI as the coupler section has the distinct advantages of low sensitivity to fabrication error, temperature, wavelength and polarisation. However, the coupling coefficient of the 2×2 MMI coupler is fixed; hence, the performance of this type of device is limited, e.g. transmission spectrum with high extinction ratio is difficult to achieve. We have designed and simulated ring resonators with coupler sections consisting of two 2×2 MMIs and phase shifters, so that the coupling efficiency can be varied from 0% to 100% with relative ease. For a single ring resonator, the transmission spectrum can be controlled to achieve an extinction ratio of >20dB and a spectral bandwidth of <1nm. For a multiple ring filter, the transmission spectrum can be controlled to achieve an extinction ratio of >30dB and a bandwidth of <1nm; in addition, a flat-top transmission spectrum is also achievable. The whole device has a footprint of approximately 200μm by 100μm.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Youfang Hu, Frédéric Y. Gardes, Goran Z. Mashanovich, and Graham T. Reed "SOI ring resonators with controllable MMI coupler sections", Proc. SPIE 7943, Silicon Photonics VI, 794311 (17 January 2011); https://doi.org/10.1117/12.887692
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