J.P. Hamaide

Demonstration of adaptive PMD compensation at 40 Gb/s

We report for the first time the full experimental assessment of an adaptive PMD compensator at 40 Gb/s over realistic PMD statistics. Results, consolidated by numerical simulations, show that the PMD limit is raised from 4 to 8 ps with the compensator.

Enhanced PSBT: demonstration of dispersion tolerance and noise resistance over 300 km terrestrial link

We study the dispersion management of enhanced phase-shaped binary transmission (EPSBT) at 10 Gb/s over a typical 300 km-long terrestrial link of SMF, varying the pre- and post-compensating DCF fiber. We compare the chromatic dispersion maps for span powers of 1 dBm and 6 dBm, where nonlinear effects influence the propagation, and show that the tolerance characteristics of EPSBT are maintained even at a span power of +6 dBm, typical for field applications.

Solitons in long-haul communications systems

Summary form only given. A promising technology for long-haul optical fiber transmission is provided by soliton systems. Soliton transmission controlled by sliding frequency guiding filtering enables higher line bit-rates (10-20 Gbit/s), longer amplifier spans (i.e., 63 km), and substantially longer transmission distances (10-20 mm). The performance of such passively controlled soliton systems is limited by timing jitter (Gordon-Haus effect and interactions). Such a limit can be overcome by in-line optical regeneration, as based on synchronous modulation. In this paper the current state-of-the-art in transmission capacity, concerning both passive and active soliton systems, is described.

Novel polarization-insensitive synchronous modulator for 20 Gbit/s all-optical regeneration

We propose the use of a saturable absorber as all-optical synchronous modulator for performing 3R regeneration in long haul transmissions. This novel regenerator is based on a fully passive component, which does not require any electric driving nor temperature control, thus significantly reducing power consumption. Moreover, it is shown to be polarization-insensitive and to exhibit a large operating wavelength bandwidth, thus making it compatible with WDM systems. Implementation of this novel regenerator in a recirculating loop made it possible to demonstrate a 20 Gbit/s error free transmission over 10,000 km with 2/sup 31/-1 PRBS coding pattern. This result clearly validates the regenerative properties of this novel 3R regenerator and makes it very attractive for cost-effective implementation of optical regeneration in high bit-rate long-haul transmission systems.

BER validation of ring-doping cladding pumped EDFAs for dense WDM applications

By means of back to back BER analysis, we have compared 2 amplifiers (using ring doping and conventional core doping) having similar performance in terms of gain, output power and noise figure. Amplification of the signal out of the fiber core like in the ring-doping technique does not impair the BER measurement nor add penalty to the analysis. We can conclude that this type of fiber can be used in amplifiers for the future high-bit rate WDM systems.