For the FTTx market, the GEPON, GPON, 10GEPON seems the roadmap for coming five (5) years.What will happend after that? WDM-PON seemed the only available solution. But, someone is aksing "How about 40gPON?"
The CWDM transportation is widely deployed for the Radio back-haul and other access application. For different application scenarios, customers prefer different topology to optimize the network for their priorities.