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For TWDM-PON systems we report measurements of and mitigation methods for the unwanted wavelength drift of directly modulated burst-mode lasers due to self-heating of the laser junction.
After extensive comparison of candidate technologies, the Full Service Access Network (FSAN) Group in early 2012 made the decision to define Time/Wavelength Division Multiplexing (TWDM) as the primary solution for the next‐generation passive optical network (NG‐PON2). A minimum of four wavelengths are foreseen as providing a total capacity per feeder line of 40 Gbit/s downstream and 10 Gbit/s or more...
We present a full system implementation of TWSDM-PON based on a low cost tunable laser in the ONU and featuring automated wavelength initialization and tracking processes that are seamlessly added to the existing XGP0N1 ONU activation protocol.
WSDM is an attractive scheme to implement low cost PONs because of the simple, tunable upstream laser. The impact of the WS filter loss on the receiver sensitivity at the OLT side is investigated and found to be recoverable by a SOA. Without SOA the budget fulfills the basic requirements for NGPON2 and with SOA even an extended budget is supported.
A periodic wavelength plan allows for a cost-effective WDM solution in PON. Using simple DFB lasers with integrated heaters we demonstrated an 8∗10 Gbit/s upstream capacity with 512 ONTs in a hybrid TDM/WDM configuration.
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