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We demonstrate the transmission of 4 channels at 43Gb/s over a record 525km unrepeatered distance using PMD-tolerant and spectrally efficient PDM-RZ-BPSK modulation combined with a coherent receiver, advanced third order Raman and remote amplification technologies and large effective area fibre.
We perform ultra-long unrepeatered transmission at 10 Gb/s, applying the most advanced technology: RZ-DPSK, third-order Raman pumping and ultra-low loss fiber. We transmit four channels over 574 km and one channel over 601 km.
Optical power of one surviving channel among 32 has been measured at the output of three hybrid Raman/Erbium amplified spans. Raman pump tuning and constant gain EDFA allows to reduce power variation to 0.2dB.
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