Abstract
In long-haul frequency-division-multiplexing lightwave transmission systems, transmission characteristics are
degraded by four-wave mixing (FWM) generated in optical fibers. To overcome this problem, modified repeated
unequally spaced (RUS) allocations such as equally spaced RUS (ERUS) and unequally spaced RUS (URUS) allocations
have already been examined. In addition, it has been shown that FWM noises decrease by separating signal frequencies
and a zero-dispersion frequency in equally spaced (ES) allocations. In this paper, ES, ERUS, and URUS allocations
are studied from the viewpoint of the position of the zero-dispersion frequency relative to the signal frequencies.
It is revealed that FWM noises are reduced in ES, ERUS, and URUS, with an increase in the separation between the
signal frequencies and the zero-dispersion frequency, and FWM noises in ERUS and URUS are much lower than FWM noises
in ES.
© 2007 IEEE
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