Abstract
We present the two-stage optical phase conjugation (OPC) to compensate both dispersion and Kerr nonlinearities in a long-haul 4×56 Gbit/s RZ-DQPSK DWDM transmission system. The two-stage OPC is realized to reduce the amount of unwanted products that are produced through nonlinear mixing processes in third-order nonlinear media. We have investigated the benefit of the two-stage OPC using highly nonlinear fiber (HNLF) and chalcogenide As 2 S 3 waveguide for comparison. We have shown that the performance of the two-stage OPC is significantly improved only in HNLF.
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