Abstract
Currently installed submarine systems are based on NZDSF and CRZ format. Increasing the capacity above the one it has been designed for raises a key issue on the spectral efficiency. The transmission loop experiments reported with spectral efficiency of 0.4(bit/s)/Hz or better1–5 exhibited however a minimum Q factor which is not sufficient to account for system margin required in an industrial submarine system. Indeed, time varying system performance impairment (1.2 dB), manufacturing impairment (0.5 dB), allowance for repair and aging (0.7 dB), represent at least 2.4 dB impairment which should be taken into account in the transmission feasibility. In this experiment, we demonstrate for the first time that the NRZ format at 10 Gbit/s over a deployed line of NZDSF combined with a true 25 GHz spacing can be employed in a 1.5 Tbit/s 4000 km industrial transmission system since all the 150 transmitted channels exhibit a 3.1 dB margin above the Q factor required to get 10–13 BER with a concatenated Reed-Solomon FEC with 7% redundancy.6,7 The average system margin is 4.8 dB.
© 2002 Optical Society of America
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