FREQUENCY-MODULATION CONTROLLED BY CROSS-PHASE MODULATION IN OPTICAL-FIBER

We have generated a frequency-modulated laser beam by use of cross-pha se modulation between orthogonally polarized beams in a polarization-p reserving optical fiber. This frequency modulation is based on the tem poral intensity beating of the drive beam that is caused by another be am that has a slightly different wavelength. Moreover, we have demonst rated generation of a special frequency-modulated laser beam with temp orally changing modulation frequency by use of cross-phase modulation in conjugation with self-phase modulation. (C) 1997 Optical Society of America