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فیبر فیدر
Both methods are able to localize failures in feeder fiber and drop fibers without e.g. using expensive tunable OTDRs.
In the case of WDM-PON system where a feeder fiber carries more than 1000 wavelength channels, each working at 1 Gb/s or even higher [14], a single failure can lead to a loss of huge amount of data.
Downstream signals are sent by the OLT through the feeder fiber and then broadcasted by the power splitter to multiple ONUs, which are located at the user ends.
In order to deploy high-capacity fiber networks, network reliability is an issue of deep concern to the operators, since a single failure in network may interrupt a huge amount of services and result in significant losses of revenue [24].According to the structure of a WDM-PON system, if a fault occurs in the feeder fiber, signals for all the connected users are affected.
When there is no fault in the drop fiber, the filtered monitoring signal will be reflected and get back to the monitoring device by passing through the filter, splitter and feeder fiber successively.
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