Discussion of 400ZR and 400ZR+ including, how they are defined, used, their impact, deployment in the field, and challenges. There is a bonus tutorial in the last half of the podcast, which caters to listeners who are new to optical networking. NeoPhotonics guests are Winston Way, Ph.D, and Chief Technology Officer, Ferris Lipscomp, Ph.D, and VP of Marketing, Marc Stiller, M.S. and VP of of Coherent Modules. Hosted by John Houghton.