Transmission Surveillance and In-Service Troubleshooting in FTTH Access Network

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Executive Summary

This paper proposed an approach for transmission surveillance and in-service troubleshooting for Fiber-To-The-Home (FTTH) access network with the combination of Optical Time Domain Reflectometer (OTDR) and Passive In-line Monitoring (PIM) devices. PIM device is a fully passive device that used to tap out a small ratio of triple-play signals for monitoring purpose without affecting the transmission in FTTH. The OTDR will be installed with Optical Line Terminal (OLT) at Central Office (CO) for in-service monitoring and failure identifying against fiber fault in feeder region, while the PIM devices will be permanently installed with drop fibers to allow the technicians to simply connect them to a portable tester unit for transmission surveillance and failure detection in multi-line drop region.

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