Abstract
In long-haul frequency-division-multiplexing (FDM) lightwave transmission systems, transmission
characteristics are degraded by four-wave mixing (FWM) generated in optical fibers. To date, equally spaced (ES),
unequally spaced (US), and repeated US (RUS) allocations have been demonstrated in FDM lightwave transmission
systems. It has already been theoretically and experimentally revealed that intensities of generated FWM lights with
$f_{\rm FWM} = f_{i}$ for RUS are lower than those for ES, and a
total bandwidth of signal lights for RUS is narrower than that for US, where $f_{
\rm FWM}$ is a frequency of an FWM light, and $f_{i}$ is a frequency of a signal light with a channel index $i$. Moreover, to overcome RUS, ES RUS (ERUS) and US RUS (URUS) have been proposed as modified RUSs and
theoretically analyzed. In this paper, ES, RUS, ERUS, and URUS allocations are studied from the viewpoint of a
transmission bandwidth of an optical filter. It is revealed that FWM noises are reduced in URUS more than in ES,
RUS, and ERUS with a decrease in a transmission bandwidth of an optical filter. The upper limit of a filter
transmission bandwidth to achieve a bit error rate of $10^{-9}$
is also obtained.
© 2007 IEEE
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