ALL-OPTICAL 1.5 MU-M TO 1.3 MU-M WAVELENGTH CONVERSION IN A WALK-OFF COMPENSATING NONLINEAR-OPTICAL LOOP MIRROR

We demonstrate highly efficient all-optical conversion from 1.5 mu m to 1.3 mu m using a novel nonlinear optical loop mirror that compensates for walk-off. We make the fiber loop by splicing alternating segments of standard single-mode and dispersion-shifted fibers and choose their lengths such that the walk-off of the 1.3 mu m and 1.5 mu m pulses in one segment is completely reversed in the adjacent segment, We also show that the width of the converted pulses can be tailored by this scheme.