Theoretical analysis of polarisation-insensitive wavelength conversion by four-wave mixing in photonic crystal fibre

Polarisation-insensitive wavelength conversion by four-wave mixing (FWM) has been demonstrated in a 20 m short nonlinear photonics crystal fibre. Theoretical analysis confirms that the combination of a 45deg pump launch and a minimum pump-probe detuning is required to reduce the polarisation sensitivity of FWM to ~1 dB.