Non-reciprocal transmission via phase conjugation in multimode optical fibres

Summary form only given. Correction of modal dispersion of light transmitted through multimode optical fibres has been the subject of extensive research to date. At low optical powers photorefractive crystals are typically used to produce phase conjugate correction at the output end of the fibre in double-pass schemes or as mutually pumped phase conjugators in more recently reported single pass geometries. Double-pass correction schemes vary in their approach to overcome the apparent problem that only one (the e-polarised) polarisation state of the scrambled output from the fibre, can undergo phase conjugate correction. We report the results of our study on the implementation of phase conjugate correction of modal distortion in highly multimode, (300 /spl mu/m diameter), short (/spl sim/1 m) passive optical fibres using a non-polarisation preserving phase conjugation scheme and its application to a non-reciprocal transmission element.