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THz-Range Optical Frequency Shifter for Dual Polarization WDM Signals Using Frequency Conversion in Fiber

: Kato, T.; Watanabe, S.; Tanimura, T.; Richter, T.; Elschner, R.; Schmidt-Langhorst, C.; Schubert, C.; Hoshida, T.


Journal of Lightwave Technology 35 (2017), No.6, pp.1267-1273
ISSN: 0733-8724
Journal Article
Fraunhofer HHI ()

We propose an optical frequency shifter for dualpolarization signals using frequency conversion in fiber. The proposed optical frequency shifter is achieved by transmitting input signal combined with two orthogonally polarized continuous wave pump lights through a nonlinear fiber and a polarizer. In the scheme, a polarization switched and frequency shifted copy of an original signal is generated in the nonlinear fiber and the subsequent polarizer removes the original signal in a wavelength independent fashion. It allows a fractional bandwidth shift, in which the shifted signal is overlapped with the original signal. We achieve THz range frequency shift with original signal suppression without an optical filter by using a polarization diversity loop. A polarization beam splitter is used as a splitter and a combiner of the loop as well as for original signal rejection. A contention resolution of two dual-polarization 400-Gb/s superchannels is demonstrated by applying the optical frequency shifter with acceptable in-band crosstalk. For any-to-any optical frequency shift, wavelength arrangement for pumps and required zero dispersion and dispersion slope of nonlinear fibers are numerically simulated.