Eric Brandon

Network application and system demonstration of WDM systems with very large spans (error-free 32/spl times/10 Gbit/s 750 km transmission over 3 amplified spans of 250 km)

We present the network applications of WDM systems with very large spans. Enabling technologies are low loss fiber, large launch powers, Raman preamplification and forward error correction. An experiment using all these technologies is presented.

461-km WDM 8 x 2.5 Gb/s repeaterless transmission using launch signal power in excess of 1 W

Using a powerful postamplifier, a remotely pumped preamplifier, chromatic dispersion compensation and forward error correction, a repeaterless transmission distance of 461 km has been achieved at 8/spl times/2.5 Gb/s. This experiment demonstrates the possibility of using launch signal powers in excess of 1 W when the chromatic dispersion compensation is optimized to minimize nonlinear impairments. In addition, 377 km has been achieved by replacing the remotely pumped preamplifier with a distributed Raman preamplifier.

Analysis of coating temperature increase in fibers under high power and tight bending

We demonstrate the relationship between coating temperature and fiber lifetime when high power is launched in lightly bent fibers. Coating temperature at the bend can thus be used as a relevant indicator for fiber reliability

4.16 Tbit/s (104 /spl times/ 40 Gbit/s) unrepeatered transmission over 135 km in S+C+L bands with 104 nm total bandwidth

104 /spl times/ 40 Gbit/s unrepeatered transmission over 135.9 km is demonstrated on S+C+L bands (1492-1596 nm) using S-band lumped Raman amplifiers. The system implements distributed Raman pre-amplification over continuous bandwidth of 104 nm.

Cayman-Jamaica fiber system: the longest 2.5 Gbit/s repeaterless submarine link installed

Recent laboratory repeaterless experiments have been demonstrated at 2.5 Gbit/s over distances of up to 511 km and 529 km using advanced techniques such as forward error correction (FEC) and remotely pumped amplification. In this paper, we describe the utilization of these techniques, in the longest repeaterless 2.5 GBit/s link actually installed for commercial service. The Cayman-Jamaica fiber system is a repeaterless optical submarine cable system that has been laid between the Cayman islands and Jamaica.

Raman limited, truly unrepeatered transmission at 2.5 Gbit/s over 453 km with +30 dBm launch signal power

Unrepeatered transmission of a single-channel, 2.5 Gbit/s signal is demonstrated over 453 km without using remote optically pumped amplifiers. An efficient SBS suppression scheme and chromatic dispersion compensation enable the launch of a+30 dBm signal into the fibre while Raman distributed preamplification is used at the receive side. Raman limitation induced by signal and pump depletion is pointed out.

407-km, 2.5-Gbit/s repeaterless transmission using an electroabsorption modulator and remotely pumped erbium-doped fiber post- and pre-amplifiers

Using an integrated laser/electroabsorption modulator transmitter, a remotely pumped postamplifier and a remotely, pumped preamplifier, a repeaterless transmission distance of 407 km over nondispersion shifted fiber is achieved at 2.5 Gbit/s. This experiment takes full advantage of high power 1480 nm pump laser diode modules through optimized remote pumping configurations and benefits from the good behavior of the electroabsorption modulator transmitted waveform in presence of fiber nonlinearity and chromatic dispersion.<<ETX>>

25 GHz spaced DWDM 160/spl times/10.66 Gbit/s (1.6 Tbit/s) unrepeatered transmission over 380 km

Unrepeatered transmission of 160 25 GHz spaced channels at 10 Gbit/s over 380 km is demonstrated. The combination of recent advanced technologies, such as DWDM multiplexing/demultiplexing, large pump power, remote amplification, in-line filtering and FEC, allow this record transmission to be achieved.

Raman amplification in unrepeatered submarine systems pushes the limits of distance and bandwidth

Raman amplification is a key technology for unrepeatered transmissions as it allows to widely increase both span length and optical bandwidth in a very simple manner. We review in this paper recent record demonstrations and installed systems where Raman amplification fulfills its role as a mean to reach very long repeaterless distances and to expand into new spectral areas.