4×40 Gb/s 2 pJ/bit Optical RX with 8ns Power-on and CDR-Lock Time in 14nm CMOS

We report a low-power 4-channel NRZ optical RX including a digital burst-mode CDR measured up to 40Gb/s/lane in 14nm CMOS. The RX, designed for 850nm VCSEL based optical links, can wake-up and achieve phase-lock in 8ns at BER −12