We propose and demonstrate a simple and cost-effective technique to detect and localize the fiber failures in WDM PON. By reusing the downstream lasers as WDM light sources for the optical time-domain reflectometry, the proposed technique can localize the failures in both feeder and drop fibers without using the expensive tunable laser.
The scalability of multi-purpose fiber-optic access network (MFAN) has been improved significantly by using active components at the remote nodes. Unlike the passive MFAN, this network could now support more than 64 optical network units (ONU's).
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