Abstract
In this paper, we propose a new function for construction work undertaken
to install optical fiber lines for services in a passive optical network
(PON). This paper describes a novel measurement technique designed to check
for optical filters located in front of an optical network unit in branched
optical fiber regions in PONs with outside optical splitters. The purpose is
to determine whether an optical fiber is “live” or
“unused.” The features of our proposed technique are the
use of test lights operating at two different wavelengths and a
nondestructive macrobending technique. By comparing the difference between
the reflected powers of the two wavelengths, we can determine the presence
of a filter at the end of a fiber line. Furthermore, we describe an enhanced
estimation analysis method that uses two photodetectors installed
symmetrically in the detection part and an analysis procedure for
detecting only a test light
reflected from the fiber end. We also demonstrate the performance of the
enhanced analysis method experimentally and confirm that it can be employed
to detect an optical filter installed at the end of an optical fiber
line.
© 2009 IEEE
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