140 Mbit/s DPSK transmission using an all-optical frequency convertor with a 4000 GHz conversion range

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Abstract
A new method of optical frequency conversion is described and demonstrated by a 140 Mbit/s DPSK optical transmission experiment. A modulated optical input signal is converted by 1500 GHz in a modulated optical output signal with a fibre-to-fibre efficiency of −10dB.