We have generated a frequency-modulated laser beam by use of cross-phase modulation between orthogonally polarized beams in a polarization-preserving optical fiber. This frequency modulation is based on the temporal intensity beating of the drive beam that is caused by another beam that has a slightly different wavelength. Moreover, we have demonstrated generation of a special frequency-modulated laser beam with temporally changing modulation frequency by use of cross-phase modulation in conjugation with self-phase modulation.
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Matsuoka et al. (1997) studied this question.
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