Project Description and Objectives

WARP-5 addresses challenges of next-generation optical access networks by applying new and innovative concepts of coherent optical communications to the metro-access segment, in order to achieve ultimate performance merits for the guaranteed throughput, the optical loss budget and the per-network user density. The specific scientific and technological objectives are:

Objective 1: To break the Tb/s barrier for the capacity of fully passive optical networks
WARP-5 will exploit a novel modulation scheme to extend the network capacity beyond 1 Tb/s. Spectrally efficient optical QAM with up to 16 levels will be applied for down- and upstream. A low-cost InP modulator with small form-factor allows thereby a high guaranteed per-user data rate of up to 10 Gb/s while retaining a high spectral occupancy. A high per-PON user count of 1000 and more will be allocated within the optical operation bandwidth of a commercial off-the-shelf tunable laser diode.

Objective 2: To extend current loss budgets of passive optical networks by one order of magnitude
WARP-5 will exploit coherent detection and a novel amplification scheme in order to achieve a considerable loss budget extension in a long >100 km reach and >1:1000 split PON. A massive compatible loss budget of 60 dB will be supported without field-deployed active extender boxes or any other electrically supplied equipment.

Objective 3: To provide a flexible and smoothly scalable ultra-dense WDM metro-access network architecture
WARP-5 will investigate novel and robust multipoint-to-multipoint architectures for economically and ecologically feasible coherent ultra-dense WDM-PONs. Migration aspects such as multi- and interoperability will be taken into account, as well as important forward-looking aspects such as elastic networking for optimised utilisation of network capacity. An intra-network communication scheme will be developed in order to allow higher user densities and a “greener” communication within and between local network segments of the metro-access PON. Convergence of wireline and wireless communications through elaborated multiplexing techniques and reception schemes is envisaged.

Objective 4: To demonstrate guaranteed 10-Gb/s per-user connectivity for a passive optical 10-Tb/s metro-access network
WARP-5 will experimentally demonstrate the potential of the developed concepts and subsystems in a future network environment, including field-deployed fibre. All the functionalities required to validate end-to-end upstream and downstream multi-gigabit delivery at the physical layer will be implemented.

The adjacent figure (by B. Schrenk et al.) shows experimental demonstrations of optical broadband network configurations published in scientific literature. In case that coherent techniques are applied to the metro-access segment, a high guaranteed throughput comes together with a high compatible reach and loss budget. The vertical lines for the delivered data rate of TDM-, OFDM- and WDM/TDM-networks in the top-right sub-plot indicates the varying throughput (high peak rate but rather low guaranteed rate) for the user.