481 km, 2.5 Gbit/s and 501 km, 622 Mbit/s unrepeatered transmission using forward error correction and remotely pumped postamplifiers and preamplifiers

1995 
Using forward error correction, a remotely pumped postamplifier and a remotely pumped preamplifier error-free unrepeatered transmission on nondispersion shifted fibre is demonstrated over record distances of 481 km at 2.5 Gbit/s and 501 km at 622 Mbit/s.
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