High-capacity S+C+L-multiband dual-polarization transmission based on C/S-interband all-optical wavelength conversion in low-GVM PPLN waveguides

High-capacity S + C + L-multiband dual-polarization optical fiber transmission is proposed and experimentally demonstrated using C/S-interband broadband all-optical wavelength conversion (AOWC) based on low group velocity mismatch (GVM) periodically poled lithium niobate (PPLN) waveguides. The interband AOWC is realized through difference-frequency generation (DFG) in a low-GVM PPLN waveguide pumped by the 764 nm second-harmonic generation (SHG) of a 1528 nm fundamental wave in another PPLN waveguide. A maximum conversion efficiency of −13.2dB and a conversion bandwidth of 146 nm are achieved. By polarization splitting, the dual-polarization AOWC is realized by using two DFG PPLN waveguides in parallel, and the average conversion efficiency is measured to be −16.2dB with a noise figure of about 9.4 dB. Based on the C/S-interband AOWCs, S + C + L-multiband dual-polarization transmission is performed over 125 km, where 128 wavelength channels are uploaded with a single-channel 200 Gb/s DP-QPSK signal. The OSNR difference introduced by S-band transmission is only about 0.5 dB in comparison to the C-band transmission.