Transmission with cascaded all-optical 3R regeneration is reported using a reconfigurable fibre loop to investigate, for the first time, the impact of varying the inter-regenerator spacing on long distance transmission. Error-free transmission at 10Gb/s over 20000km of standard single-mode fibre was achieved with inter-regenerator spacing range of 150-600km, corresponding to an OSNR range of 30-23 dB/0.1nm at the regenerator input.

© 2005 Optical Society of America

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