Abstract
We compare techniques using two fibers connected either in series or in parallel for cancelling cross talk that is due to stimulated Raman scattering in wavelength-division-multiplexed systems. Theory shows that such cross talk can be completely eliminated by a series arrangement in lossy dispersionless fibers by means of midway amplification and spectral inversion. In dispersive fibers, cross-talk reduction of the order of the Raman gain G can be obtained by adding dispersion compensation and alternating dispersion. Alternatively, a similar cross-talk reduction can be obtained by use of parallel transmission of signals on different sets of wavelengths and differential detection; in the presence of dispersion, the dispersion for the different sets of wavelengths must be opposite. The parallel approach appears to be more practical.
Published Version
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