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With optical technology evolution, it becomes possible to perform all optical traffic grooming (AOTG) with a very fine granularity. In the context of flexible optical networking, AOTG paves the way to new possibilities in future transport networks. Finding the best trade-off between electrical and optical aggregation in intrinsically multi-layer transport networks is a complex challenge for operators. This paper compares CAPEX results and resource fill-in performances of electrical and optical aggregation solutions, through a real multilayer transport network case study.

New time-slotted subwavelength switching paradigms have been proposed as promising solutions to exploit the subwavelength bandwidth overcoming many limitations of traditional optical burst switching (OBS) schemes. Since these new paradigms are based on fix-sized bursts transmitted during time slots, the efficient assembly of IP packets into optical bursts is the first mile stone to reach in the way of the real deployment of all-optical transport networks based on them. Then, in this paper, we propose alternate architectures for implementing such networks and we assess them by studying the efficiency of several burst assembly policies. The study is performed by analyzing real internet traffic extracted from the national transport network of Orange. This is the first time to our knowledge that such study is performed. In this paper we identify the architectures that are viable, in terms of assembly process, for the deployment of such new paradigms in an all-optical core network.

The design and operation of optical transparent networks requires some physical layer awareness that is obtained through physical modelling. We show in this paper that the operator context adds some constraints for the design and use of these models.

We present two 8/spl times/170 Gbit/s DWDM/OTDM (1.28 Tbit/s) field transmission experiment both over more than 400 km in commercially operated legacy networks of France Telecom (FT) and Deutsche Telekom (DT), respectively. Conventional EDFA based amplification schemes as well as distributed Raman amplified systems are tested. For different levels of polarization mode dispersion due to different quality of the installed fibre infrastructure adaptive PMD compensation and polarization de-multiplexing is tested.

We report on the impact of PMD in a 8/spl times/170 Gbit/s DWDM transmission experiment over 430 km field installed SSMF with and without PMD compensation. Stable performance is only achieved when using PMDC.

The paper studies the impact of ultra long haul WDM transmission systems and traffic volume on the cost of translucent (or hybrid) optical transport networks. The cost of translucent networks is evaluated as a function of the reach of WDM systems using the prices of commercially available network elements and is compared with the cost of the corresponding opaque networks. The results show that a translucent network is approximately 50% cheaper than the opaque counterpart and a further cost reduction can be expected by extending the reach of WDM systems from 1150 km to 2500 km.