Jean-Christophe Antona

On nonlinear distortions of highly dispersive optical coherent systems

We investigate via experiments and simulations the statistical properties and the accumulation of nonlinear transmission impairments in coherent systems without optical dispersion compensation. We experimentally show that signal distortion due to Kerr nonlinearity can be modeled as additive Gaussian noise, and we demonstrate that its variance has a supra-linear dependence on propagation distance for 100 Gb/s transmissions over both low dispersion and standard single mode fiber. We propose a simple empirical model to account for linear and nonlinear noise accumulation, and to predict system performance for a wide range of distances, signal powers and optical noise levels.

Demonstration of the interconnection of two optical packet rings with a hybrid optoelectronic packet router

We demonstrate the interconnection of two optical packet switching systems: a hybrid optoelectronic packet router and two optical packet rings. Error-free inter-ring and intra-ring optical packet transmission and unicast and multicast transport of encapsulated 10 GbE are achieved.

Nonlinear cumulated phase as a criterion to assess performance of terrestrial WDM systems

Through extensive numerical studies, we showed that the cumulated nonlinear phase can be considered as a relevant parameter to assess the performance of N /spl times/ 40 Gbit/s terrestrial systems, after calibration. This can be of high interest for constraint based-routing algorithms in Ultra-Long haul transparent networks: indeed, a node could decide, with the knowledge of the nonlinear phase and OSNR evolution, whether a path should be regenerated or not.

Cost-optimized 6.3 Tbit/s-capacity terrestrial link over 17 /spl times/ 100 km using phase-shaped binary transmission in a conventional all-EDFA SMF-based system

We demonstrate the feasibility of 6.3 Tbit/s capacity over 17 /spl times/ 100 km using well-proven all-erbium-doped fiber amplifier technology over a typical ultra-long haul link based on standard fiber. This experiment emphasizes the advantages of our modulation format, namely phase-shaped binary transmission.

Numerical optimization of pre- and in-line dispersion compensation in dispersion-managed systems at 40 Gbit/s

In the context of 40 Gbit/s terrestrial networks, we have exhibited a simple design rule to help perform dispersion management of single-channel links. The optimal pre-compensation has been shown to vary linearly with the in-line residual dispersion. Moreover, the dependence of these parameters on span length and fiber type has been assessed. Preliminary results have also shown the relevance of this rule in WDM configurations.

Elastic optical networks: The global evolution to software configurable optical networks

Worldwide operator deployment of high-speed 100G coherent optical networks is currently underway. To ensure a competitive solution offering significant performance improvements to cope with the ever-increasing traffic demand, a novel network concept has been proposed for improved resource utilization based on “elasticity”; specifically, the ability to make a number of previously fixed transmission parameters tunable, for example optical data rate or channel spacing. The benefits are numerous, including increased network capacity, lower cost per bit, and improved energy efficiency and scalability. In this paper, we review the work carried out within the Cooperation for a Sustained European Leadership in Telecommunications (CELTIC) Elastic-Optical NETwork (EO-Net) project towards advancing the state of software-configurable optical networking. We identify the key building blocks for enabling elastic optical networks to provide desired performance improvements over static optical networks. We examine the design of elastic transponders capable of data rate adaptation, interfaces between client packet devices and transponders supporting flexible traffic aggregation, and associated algorithms for traffic grooming and routing. We also perform network cost/energy analyses. Finally, we review the experimental demonstration of such elastic functionalities.

Directly modulated and fully tunable hybrid silicon lasers for future generation of coherent colorless ONU

We propose and demonstrate asymmetric 10 Gbit/s upstream--100 Gbit/s downstream per wavelength colorless WDM/TDM PON using a novel hybrid-silicon chip integrating two tunable lasers. The first laser is directly modulated in burst mode for upstream transmission over up to 25 km of standard single mode fiber and error free transmission over 4 channels across the C-band is demonstrated. The second tunable laser is successfully used as local oscillator in a coherent receiver across the C-band simultaneously operating with the presence of 80 downstream co-channels.

Dimensioning and Energy Efficiency of Multi-Rate Metro Rings

Due to the ever-growing network capacity demand, energy-efficient and scalable networking solutions are needed in all networking segments. This paper focuses on the metro segment and compares the power consumption for four different technologies: Ethernet, Reconfigurable Optical Add-Drop Multiplexers (ROADM), Optical Transport Networks (OTN), and an optical packet switching (OPS) solution called Packet Optical Add-Drop Multiplexers (“POADM”), which was recently proposed. A novel resource allocation strategy for POADM-based OPS multi-rate rings is proposed for the first time. The multi-rate POADM ring network resource allocation problem is shown to be NP-hard and solved using both an MILP formulation and a heuristic. The MILP formulation and the heuristic are compared, along with dimensioning results for Ethernet and ROADM/OTN ring networks. Results show that multi-rate POADM rings achieve savings up to 10% with respect to single-rate design and can be enabled by assigning a different rate to each wavelength. Furthermore, POADM rings can be up to 5 times more energy-efficient than Ethernet rings and 30% than ROADM rings, assuming similar network efficiencies.

Parametric gain in the strongly nonlinear regime and its impact on 10-Gb/s NRZ systems with forward-error correction

In this paper, we show that the nonlinear parametric gain (PG) interaction between signal and noise is a nonnegligible factor in the design and analysis of long-haul dispersion-managed optical 10-Gb/s on-off keying nonreturn to zero transmission systems operated at small signal-to-noise ratios (OSNRs) such as those employing forward-error correction (FEC) coding. In such a regime, we show that the in-phase noise spectrum exhibits a large gain close to the carrier frequency, which is due to the higher order noise terms accounting for the noise-noise beating during propagation that is usually neglected in the nonlinear Schro/spl uml/dinger equation. With a novel stochastic analysis that keeps such higher order terms, we are able to analytically quantify the maximum tolerable signal power after which PG unacceptably degrades system performance. We verify such an analytical power threshold by both simulation and experiment. We finally quantify the needed extra OSNR, or equivalently FEC coding gain, required when taking PG into account.

System impairment of double-Rayleigh scattering and dependence on modulation format

The penalty induced by double-Rayleigh scattering is quantified by back-to-back BER measurement with independent generation of Rayleigh-type and ASE noises. We determine the weighting coefficient of the DRS noise contribution of four modulation formats.