Pluggable coherent optics are now being developed for 400G applications with two distinct streams emerging. One is high performance CFP2 based for 1000+km reach and multi-service applications and the other is QSFP-DD ZR (and perhaps OSFP) for DCI and metro Ethernet applications. Both streams present new challenges for test and measurement, not just to meet the demanding technical specifications but also to ensure pain-free integration and deployment in an open ecosystem.
Wavefront shaping has revolutionized the spatial control of coherent light beams thanks to the use of spatial light modulators (SLM) in disordered systems such as biological tissue, white paint or multimode fibers. Different approaches have been developed to control the propagation of coherent light that has experienced scattering, such as iterative optimization, optical phase conjugation, and the measurement of the optical transmission matrix.
As coherent optics development moves away from a one-size-fits-all approach, the market dynamics will continue to favor suppliers that are vertically integrated around coherent DSP technology. This will undoubtedly disrupt the traditional competitive ecosystem between optical components, modules and system suppliers.
Inphi’s new Canopus signaling chips will triple throughput while reducing power draw for transmissions up to 100 kilometers by up to 75%. Coherent optical transmission uses modulation and phases of light to amplify transmission. The Canopus coherent digital signal processor (DSP) manages and cleans up the optics.
