Abstract
We provide the theoretical framework for a new method of distributed
measurement of cumulative PMD along single-mode optical fiber links. Independent
pairs of optical pulses are launched into the fiber, where each pair consists
of two pulses having the same state of polarization (SOP) but two different,
closely spaced wavelengths. The key aspect is that both the SOP and center
wavelength of a given pair need not be correlated with those of any other
pair. This random-scrambling approach is well suited for an economically designed
instrument that is more robust for field applications than previously reported
approaches. Since no assumed model of the distributed birefringence behavior
is required, the method is suitable for any actual single-mode telecom fiber
span encompassing many fiber sections of different types and origins.
© 2009 IEEE
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