Silicon-photonic PTAT temperature sensor for micro-ring resonator thermal stabilization.We present a scheme for thermal stabilization of micro-ring resonator modulators through direct measurement of ring temperature using a monolithic PTAT temperature sensor.  The measured temperature is used in a feedback loop to adjust the thermal tuner of the ring.  The closed-loop feedback system is demonstrated to operate in presence of thermal perturbations at 20Gb/s.
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