An 800 Gb/s, 16 channel, VCSEL-based, co-packaged transceiver with fast laser sparing

We report on high speed, low power, and sparing characteristics of the transmitter portion of an 800 Gb/s co-packaged transceiver using VCSELs and 2:1 sparing for improved reliability. The transmitter consumes 2.7 pJ/bit including the laser. The spare VCSEL can be enabled in < 100ns.