Abstract
The crosstalk between individual wavelength channels caused by stimulated Raman scattering in a single-mode fibre is calculated for uni- and bi-directional transmission in wavelength multiplex systems for the case of both steady and modulated light. The modulated-light description shows that — in addition to a negligible in-phase attenuation of the pump light and amplification of the signal light — there is a disturbing out-of-phase transfer of information between the wavelength channels which decreases strongly as the modulation frequency of the light increases. This crosstalk attenuation for uni- and bi-directional transmission with modulated light can be described by simple formulae for the case (which is of great interest in practice) of route lengths exceeding 25 km into which mean light-powers below 15 mW are coupled. For a route length of 30 km with a mean light-power of 2.5 mW coupled into a single-mode fibre, crosstalk attenuation increases from 30 dB in the case of steady light to 53 dB for uni-directional and 88 dB for bi-directional transmission of light modulated at a frequency of 1 GHz. To reduce the crosstalk caused by stimulated Raman scattering, high bit rates and codes having small low frequency components should be selected.
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