A simple all-optical wavelength converter based on cascaded highly nonlinear fibers with high conversion-efficiency

In all-optical wavelength converters based on highly nonlinear fiber (HNLF), the longer fibers always have lower Stimulated Brillouin Scattering (SBS) threshold power. In the paper, we proposed an all-optical wavelength converter with increasing SBS threshold by cascading two different HNLFs. We experimentally achieved -8-dB conversion efficiency and good converted signals with negligible power penalties.