GigPeak, Inc. announced a 64 GBd quad-channel linear optical modulator driver for 400G/600G coherent optical networks. The GX66471 will support 16- and 64-QAM, addressing the needs of both 400G and 600G systems. It has a differential input and single-end output, with a 4.5 Vpp output swing for driving lithium niobate Mach-Zehnder modulators.