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As a modulation-format transparent nonlinear process, FWM is capable of generating complex optical signal constellations. In experiments and simulations, optical ASK-DPSK and 8-QAM signals are generated with one-step or two cascaded FWM processes, respectively.
All-optical wavelength interchange for differential phase-shift-keying signal is proposed and demonstrated using an optical parametric loop mirror with a phase-controlled optical pump. The performance of wavelength interchange is experimentally evaluated at 10 Gb/s. Successful swapping of phase information is achieved with error-free performance for 231-1 pseudorandom binary sequence encoded signals.
A novel wavelength multicasting is presented by using cascaded four-wave-mixing. Multiple wavelength multicast channels are experimentally achieved and the NRZ data format is converted to RZ format simultaneously.
An optical frequency down-converter based on four-wave mixing in highly nonlinear fibers is proposed and experimentally realized for radio-over-fiber systems. A down-converted 1.5 GHz intermediate-frequency signal is obtained from a received 11.1 GHz millimeter-wave signal.
A multi-wavelength erbium-doped fiber laser with a simple line-structure is achieved by employing a Sagnac interferometer. It is demonstrated to be quite stable at room temperature due to the four-wave mixing effect in the dispersion-shifted fiber inserted in the laser cavity.
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