Polarisation independent all-fibre phase conjugator incorporating inline fibre DFB lasers

We propose and demonstrate a novel technique for optical wavelength conversion and phase conjugation by fibre four-wave mixing (FWM) using inline fibre distributed-feedback (DFB) lasers as orthogonally polarized pump sources. This technique features polarisation independent operation without the need for externally injected pump light. Polarisation dependency as low as 0.5dB has been achieved using this technique