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An experimental technique was developed for measuring bit error rates in multi-thousand kilometre fibre amplifier systems using a circulating loop. A transmission distance of 14300 km at 5 Gbit/s and 21000 km at 2.4 Gbit/s was achieved using a nonreturn-to-zero pseudorandom data pattern. The bit rate distance product of the 5 Gbit/s result was 71 Tbit km/s.<<ETX>>