Abstract
Phase sensitive amplifiers (PSA) in fibers have been the basis of a number of diverse demonstrations in optical regeneration experiments for advanced coherent modulation formats such as BPSK, QPSK, QAM [1-3]. The most recent demonstrations propose solutions which are compatible with polarization multiplexing. The unique property of phase sensitive processes that differentiate them from other regeneration techniques is the perfect phase quantization they offer in two discrete phase states differing by π. When higher order modulation formats are targeted, for instance QPSK, either two typical PSAs should be incorporated, each for each quadrature, or a multi-format PSA, which however is not capable of providing ideal quantization [2]. It is obvious that for polarization multiplexed M-PSK signals, the former solution is not scalable. Therefore, a multi-format processor with potential for ideal multi-level phase quantization is of high significance in order to attain efficient optical regenerators of advanced modulation formats.
© 2015 IEEE
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