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An all-active 2R regenerator using POLIS

We hereby present a new concept for the use of polarization dependent gain in highly strained quantum well waveguides (the POLIS concept) to create a 2R regenerator. Advantage is taken of the different material properties for the two polarization states to overcome the obstacles caused by the conflicting requirements that active and passive components would impose on the materials used. The regenerator consists of a series of polarization converters and SOAs. Non-linear interactions in the SOA will influence the interference between the two polarization states. This results in a S-shaped transfer function, a property that could be used to achieve mode-locking.