Abstract
We propose a method for monitoring branched sections in passive optical networks (PONs), where identification
fibers are used to distinguish each branched section. We clarify the required characteristics for the separation of
the Brillouin frequency shifts of each identification fiber. We design and fabricate identification fibers with
well-controlled ν<sub>B</sub> values for PON monitoring based on
the required characteristics. The realized Brillouin frequency shift difference is less than 40 MHz from the target,
and we achieve a 1-GHz Brillouin frequency shift separation and a 0.06-dB splice loss for standard single-mode
fiber. We also demonstrate fault location in a PON using identification fibers connected to a 4-branched splitter.
The bending loss in the branched section is successfully located by using the designed identification fibers and a
Brillouin optical time domain reflectometer.
© 2007 IEEE
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