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The first field demonstration of 320 Gbit/s WDM transmission based on an electrically multiplexed 40 Gbit/s channel with a word length of 223 – 1 over a 176 km dispersion-shifted fibre is presented. The high fibre input power of +10 dBm/ch, which allows a large span loss, is achieved by using the carrier-suppressed return-to-zero signal format and L-band WDM amplification.
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Yonenaga et al. (2000) studied this question.
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