Nice summary info, thanks Photonics Guy, notice for PAM4 there is >>
increased bit error rate or BER
So this is a reason the costs go much higher for EC
Remember Slide 17
• Advanced modulation requires a lot of additional electronics for digital signal processing (DSP) • Dramatic increase in transceiver electronic content for PAM4 • Coherent requires even more DSP • Pushback on number of lanes • 4 is preferred over 8 for single-mode, 16 considered only for multi-mode