Optical communications solution provider, Oclaro, has announced the CR5100 series of 100 Gbps coherent receivers. As noted by the company in this MarketWatch news release, these new receivers provide customers with a compact and cost-effective solution to implement coherent communication using the polarization multiplexed quadrature phase shift keying (PM-QPSK, DP-QPSK) format, which is the modulation scheme of choice for metro and long-haul optical transmission.