Polarization-independent, wavelength-shift-free optical phase conjugator using a nonlinear fiber Sagnac interferometer

We propose and experiment with a novel configuration of a wavelength-shift-free optical phase conjugator using a nonlinear fiber Sagnac interferometer. In the proposed configuration, two orthogonally polarized pump waves are fed into different ports of the Sagnac interferometer, and we can achieve polarization-independent as well as wavelength-shift-free operation.