All-optical regeneration of polarization of a 40 Gbit/s return-to-zero telecommunication signal [Invited]

Fatome, J., Sugny, D., Pitois, S., Morin, P., Guasoni, M., Picozzi, A., Jauslin, H.R., Finot, C., Millot, G. and Wabnitz, S. (2013) All-optical regeneration of polarization of a 40 Gbit/s return-to-zero telecommunication signal [Invited]. Photonics Research, 1 (3), 115-123. (doi:10.1364/PRJ.1.000115).

Abstract

We report all-optical regeneration of the state of polarization of a 40 Gbit/s return-to-zero telecommunication signal. The device discussed here consists of a 6.2-km-long nonzero dispersion-shifted fiber, with low polarization mode dispersion, pumped from the output end by a backward propagating wave coming from either an external continuous source or a reflection of the signal. An initially scrambled signal acquires a degree of polarization close to 100% toward the polarization generator output. All-optical regeneration is confirmed by means of polarization and bit-error-rate measurements as well as real-time observation of the eye diagrams. We show that the physical mechanism underlying the observed four-wave-mixing-based polarization attraction phenomenon can be described in terms of the geometric approach developed for the study of Hamiltonian singularities.

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