Abstract
In long-haul frequency-division-multiplexing (FDM) lightwave transmission
systems, transmission characteristics are degraded by four-wave mixing (FWM)
in optical fibers. To date, equally spaced (ES), unequally spaced (US), and
repeated unequally spaced (RUS) allocations have been demonstrated in FDM
lightwave transmission systems. It has been already revealed theoretically
and experimentally that optical power of FWM light with ƒ<sub>FWM</sub> = ƒ<sub><i>i</i></sub> for RUS is lower than that for ES,
and a total bandwidth of signal light for RUS is comparable to that for US,
where ƒ<sub>FWM</sub> is
a frequency of FWM light and ƒ<sub><i>i</i></sub> is a frequency of signal light with a channel index <i>i</i>. Moreover, it has been shown that equally spaced
RUS (ERUS), unequally spaced RUS (URUS), and paired RUS with combined base
units have lower FWM noises than RUS with a single base unit. In this paper,
paired URUS is proposed as modified URUS and theoretically analyzed. Efficiency
of FWM light and a total bandwidth of signal light for paired URUS are compared
with those for URUS. As a result, it is found that the efficiency of FWM light
with ƒ<sub>FWM</sub> = ƒ<sub><i>i</i></sub> for
paired URUS is lower than that for URUS, and the total bandwidth of signal
light for paired URUS is slightly narrower than that for URUS. Bit error rate
and power penalty for paired URUS are also lower than those for URUS at a
modulation speed of 10 Gb/s. Therefore, it is concluded that paired URUS is
superior to URUS in FDM lightwave transmission systems.
© 2008 IEEE
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