Abstract
With the adoption of differential phase encoding for optical fiber transmission systems a new generation of all-optical regenerators is required. They should provide not only amplitude regeneration, but must additionally preserve the phase relation between adjacent optical pulses. This condition is not satisfied for most of the contemporary all-optical regenerator concepts. A promising candidate for a phase-preserving regenerator is the Nonlinear Amplifying Loop Mirror (NALM) with a strongly asymmetrical splitting ratio. Its performance was approved in simulations [1] and in experiments [2] on suppression of amplitude fluctuations in a 10-Gbit/s differential phase-shift-keying transmission. This work presents the numerical investigations on the physical limitations and optimization of the NALM as a regenerator of phase-shift-keyed signals.
© 2007 IEEE
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