TECHNICAL
200Gbits and 400Gbits is a straightforward path thanks to Coherent and PAM4 technologies. The 100G is already a combination of 4x25Gbits (IM-DD) with direct detection. To keep a 25/28G baud rate, extra modulations
are required combined with other components such as DSP.
Next step is to move with a laser and DSP running at 50/56Gbaud but this technology is not available in volume yet.
IM-DD Technology IM-DD 100Gbits (regular 100G transceivers, max 25km without FEC, 40km with FEC).
Coherent technology Coherent 100G DP-QSPK
Coherent 200G 16QAM
PAM4 Technology PAM4 100G (28Gbaud)
PAM4 200G (28Gbaud)
PAM4 400G (28Gbaud)
PAM4 400G (56Gbaud)
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Volume 47 No.1 MARCH 2025
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