Everyone is getting aboard the PAM-4 train.
Active Insight
MultiPhy’s efforts with non-coherent 100G 4×28 solutions for metro interconnect met with limited success. Finisar was first to market with this approach, and their largest customer ADVA sold it with great success. But the volumes for this approach so far are dwarfed by shipments of coherent solutions.
Like InPhi, which has already invested heavily, MultiPhy will target the much larger volumes of the 2km datacenter market first then look to stretch the capabilities of PAM-4 to attack the 100G metro access market.