A novel modulation format, the duobinary carrier-suppressed return-to-zero format, is proposed; its bandwidth is less than 100 GHz at 43 Gbit/s. 100 GHz-spaced DWDM unrepeatered transmission is demonstrated over 163 km at +10 dBm/channel with a crosstalk penalty under 1 dB.
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Miyamoto et al. (2001) studied this question.
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