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An allowable transmission-line loss as high as 65.6 dB has been experimentally obtained by using a newly developed high-power 1.32 ?m Nd-y.a.g. laser with an average fibre input power of +22.0 dBm at 32 Mbit/s in return-to-zero pulses, which ensures 100 km repeater-spacing transmission with presently available low-loss optical fibres