Vincent Letellier

Margins through pre-emphasis adjustment in WDM systems

A method to evaluate the transmission performance margins of WDM systems, based on multiplex pre-emphasis optimisation, has been experimentally validated. We propose a method of pre-emphasis adjustment based on transmission performance measurement through foward error correction that allows the transmission performance margin of amplified systems to be determined even if the transmission is error-free.

Robustness of WDM submarine transmission to degraded conditions

In conclusion, after optimization of the repeater output power, no degradation in case of channel failure was observed in a 6000-km 8 X 2.5 Gbit/s WDM transmission. The SNR degradation induced by cable loss increase and pump failures on a 4 X 2.5 Gbit/s 4600-km transmission nas only 1 dB higher for the upper wavelengths compared to the lower wavelengths.

124 × 10 Gbit/s RZ-DPSK Transmission over 12380 km without Channelized Chromatic Dispersion Management

We report transmission results of 124 RZ-DPSK channels modulated at 10.709 Gbit/s over 12380 km without channel chromatic dispersion management and we demonstrate industrial performance margins for Terabit/s systems over transpacific distances.

Life of a submarine cable from laboratory to seabed

This paper summarizes the three years life time of a long-haul submarine system, starting from the laboratory investigation and ending up with the on-site commissioning transmission tests.