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Opt Lett. 2010 Sep 1;35(17):2940-2. doi: 10.1364/OL.35.002940.

Electro-optical tunable time delay and advance in silicon microring resonators.

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Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.


We demonstrate electro-optical tunable time delay and advance in a silicon-microring-resonator-based notch filter integrated with a lateral p-i-n diode. We tune the time delay and advance by controlling the coupling regimes from over- to under-coupling through carrier-injection-based free-carrier dispersion effect. We measure maximum time delay and advance of approximately -95 and approximately 96 ps near critical coupling, with bandwidths of approximately 3.5 and approximately 3 GHz, upon dc power consumption in the range of 1 mW. We model the transmission spectra and time delay/advance using the transfer-matrix method and analyze the time-intensity and time-bandwidth products, which show good agreement with our measurements.

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