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Proceedings Paper

SOI ring resonators with controllable MMI coupler sections
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Paper 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.

Paper Details

Date Published: 17 January 2011
PDF: 10 pages
Proc. SPIE 7943, Silicon Photonics VI, 794311 (17 January 2011); doi: 10.1117/12.887692
Show Author Affiliations
Youfang Hu, Univ. of Surrey (United Kingdom)
Frédéric Y. Gardes, Univ. of Surrey (United Kingdom)
Goran Z. Mashanovich, Univ. of Surrey (United Kingdom)
Graham T. Reed, Univ. of Surrey (United Kingdom)


Published in SPIE Proceedings Vol. 7943:
Silicon Photonics VI
Joel A. Kubby; Graham T. Reed, Editor(s)

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