Dominique Chiaroni

The European IST project DAVID: a viable approach toward optical packet switching

In this paper, promising technologies and a network architecture are presented for future optical packet switched networks. The overall network concept is presented and the major choices are highlighted and compared with alternative solutions. Both long and shorter term approaches are considered, as well as both the wide-area network and multiple-area networks parts of the network. The results presented in this paper were developed in the frame of the research project DAVID (Data And Voice Integration over DWDM) project, funded by the European Commission through the IST-framework.

A highly integrated 32-SOA gates optoelectronic module suitable for IP multi-terabit optical packet routers

For the first time, the realization and the performance of a compact optoelectronic 32-SOA module including their drivers is reported. Preliminary experiments in an optical packet switching matrix for IP multi-terabit router is also reported.

First demonstration of an asynchronous optical packet switching matrix prototype for multi-terabit-class routers/switches

An optical packet switching matrix for multi-terabit-class routers/switches has been prototyped. It is based on novel integrated optical gate arrays and asynchronous packet-mode receivers. Full asynchronous operation with 10 Gbit/s RZ optical packets is demonstrated for the first time.

Fiber delay lines optical buffer for ATM photonic switching applications

An optical buffer shift register based on a set of fiber delay lines is presented, with the goal of providing cell storage and queuing in asynchronous transfer mode (ATM) photonic switches. The concept of multiwavelength cell buffering is adopted, to realize a shared buffer with a storage capacity equivalent to a set of shift registers. Since only one wavelength-encoded cell must enter one delay line at each time slot, contention resolution is necessary to determine the queuing order between the incoming cells. The use of optical fibers as delay lines and semiconductor optical amplifiers as gates associated with passive splitters to realize buffering and time-switching has been demonstrated. An experimental setup has been implemented at 600 Mb/s and operates without guard bands between packets. The low penalty observed shows that system synchronization and reliability are good.<<ETX>>

Design and implementation of a multi-terabit optical burst/packet router prototype

This paper reports the first demonstration of a multi-terabit IP optical router. A sub-equipped rack-mounted prototype has been designed and assembled, demonstrating all key functions of large, scalable packet router. The design exploits burst switching techniques through to an integrated optical packet switching fabric.

Physical and logical validation of a network based on all-optical packet switching systems

The large growth of telecommunication traffic demand generated by multiple new applications and expected to last at least for the next decade will force telecom operators to consider offering more flexible transport services. All-optical packet switching is a powerful technique to provide this flexibility and to support in a cost-efficient way a wide range of bandwidth consuming applications. After a very brief introduction about the packet-switched network architecture studied in the framework of the ACTS KEOPS project, we describe the structure of the packet-switching node we have defined. We then move into physical and logical analysis of the network including more than 40 network sections based on 160 Gb/s throughput optical packet switching nodes could operate error free. In addition, logical simulations have proved that such networks could provide a quality of service (packet loss rate and packet transfer delay per node) compatible with a large variety of service classes. Both results validate the feasibility of the network concept and pace the way toward a flexible network based on all-optical switching techniques.

Multiservice optical network: main concepts and first achievements of the ROM program

With the tremendous introduction of internet protocol (IP) applications, the quality-of-service (QoS) becomes more and more an emergent issue. Concrete solutions can be adopted (IP/ATM/SONET/WDM) opening the way to new types of applications (interactive applications through the exploitation of voice and video) in a short-term approach. However, all the telecommunication community tries to provide new solutions offering capacity and flexibility in a simpler manner. In this paper, we present the concepts of a multiservice optical network studied in the framework of a French Research Program. The QoS could be offered through the combined exploitation of electronic memories in the edges and optical resources in the core of the optical network and through the coexistence of different types of connections. In particular, the traffic shaping in the edges is highlighted through simulation and demonstrates the real impact of this function to maintain the logical performance at its highest level. To propose concrete solutions for its implementation, two network scenarios are proposed. The first one, for the backbone, exhibits a novel optical packet switching architecture taking benefit of the massive presence of wavelengths to solve the contention. The second one, for the metro, shows a second optical packet switching architecture really adapted to the cost constraints (upgradability, compactness, granularity).

Packet switching matrix: a key element for the backbone and the metro

The evolution of the traffic in terms of volume and profile creates a need for multi-Terabit network elements providing the required flexibility to support a bit rate more and more variable than fix. In this paper, we describe an optical matrix that can be used in different network applications. After a description of an optical matrix capable to handle Terabit capacities, we will then describe two important applications. The first one is for the backbone, in the core a multi-Terabit class routers. The objective is to simplify the architecture and to provide better performance. Some extension will be given to project this view at a network scale, envisaging a new multiprotocol packet format. The second one is for the metro, for the HUB. This last concept is studied in the frame of the IST DAVID project. The required optical technology will be described highlighted with some key realizations and validation results. Finally, a conclusion will draw the perspectives for the next steps.

Improvement of regeneration capabilities in semiconductor optical amplifier-based 3R regenerator

A 4-dB reduction of the optical signal-to-noise ratio admissible by an all-optical regenerator is demonstrated. Applied to long-haul transmission, an error-free 10-Gbit/s NRZ transmission over 170,000 is performed with 170-km repeater spacing.

Experimental validation of an all-optical network based on 160 Gbit/s throughput packet switching nodes

We present for the first time a physical validation of an all-optical packet-switched network. More than 40 network sections, including 100 km of fibre and one optical packet switching node, have been cascaded with negligible sensitivity penalty at 10 Gbit/s.