Abstract
The theory of two counter-propagating polarized beams interacting in a randomly
birefringent fiber via the Kerr and Raman effects is developed and applied to the
quantitative description of Raman polarizers in the undepleted regime. Here Raman
polarizers, first reported by Martinelli [6], are understood as Raman amplifiers
operating in the regime in which an initially weak unpolarized beam is converted into an
amplified fully polarized beam towards the fiber output. Three parameters are selected
for the characterization of a Raman polarizer: the degree of polarization of the
outcoming beam, its state of polarization, and its gain. All of these parameters
represent quantities that are averaged over all random polarization states of the
initially unpolarized signal beam. The presented theory is computer friendly and
applicable to virtually all practically relevant situations, including the case of
co-propagating beams, and in particular to the undepleted as well as the depleted
regimes of the Raman polarizer.
© 2010 IEEE
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