A 10Gb/s, 342fJ/bit micro-ring modulator transmitter with switched-capacitor pre-emphasis and monolithic temperature sensor in 65nm CMOS

Abstract

In this work, a CMOS-SiPh optical transmitter based on carrier-injection ring modulators is presented. It features a novel low-power switched-capacitor-based pre-emphasis that effectively compensates the modulator bandwidth limitation. A wavelength stabilization technique via direct measurement of ring temperature using a monolithic PTAT sensor is also presented. The optical transmitter achieves energy efficiency of 342fJ/bit at 10Gb/s and the wavelength stabilization circuit consumes 0.29mW.