Abstract
This paper introduces an in-service line monitoring technique that can
locate a fault in branched optical fibers in passive optical networks (PONs)
from a central office. This technique can upgrade the conventional optical
fiber line testing and monitoring system. To distinguish a backscattered signal
from each branched PON fiber, we employ the fibers with individually assigned
Brillouin frequency shifts (BFSs) fibers as drop cables and a 1650-nm Brillouin
optical time-domain reflectometer (B-OTDR) instead of the OTDR used in the
conventional testing system. This paper describes the design of the BFS taking
the outside plant environment into consideration, and discusses the performance
of the proposed testing system. We also demonstrate an experimental measurement
that locates a fault in a branching fiber after a 1 $\times$ 8 optical splitter, and in-service
line monitoring for gigabit Ethernet PON (GE-PON) transmission systems.
© 2009 IEEE
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