Polarization insensitive wavelength conversion techniques for 100Gb/s polarization-diversity signal

Wavelength conversion (WC) of high-speed polarization diversity phase modulated signals based on four-wave mixing (FWM) in high-nonlinear dispersion fiber (HNLF) with a polarization diversity and digital coherent detection is experimentally demonstrated. Different schemes to realize polarization insensitive WC are investigated. By using co-polarized dual-pump scheme, the in-band WC of sixteen channels of 112Gb/s polarization diversity-return to zero quadriphase shift keying (PD-RZ-QPSK) has been realized. Another scheme of dual-pump technique to use orthogonal-polarized pumps is also been investigated. By using this scheme, four converted 112-Gb/s PD-RZ-QPSK with BER≪ 1×10
⁻⁴
has also been demonstrated. The third scheme is to use single pump polarize diversity scheme. By using this scheme, we have realized WC for the signals from C-band to L-band.