Optimisation of Physical Layer Parameters for an All-Optical Network Testbed

H. Zeng, A. Vukovic, H. Hua, M.J. Savoie, C. Huang, and T. Nguyen (Canada)


Wavelength division multiplexing (WDM), physical layer, end-to-end lightpath, numerical simulation, signal impairments, bit-error rate.


The capacity and high flexibility potentials of all-optical networks (AONs) have already been realized. While keeping the signal in the optical domain, an AON is limited by performance degrading effects. Therefore, the link budget has to take into account both noise and distortion related impairments. In this paper a simulation environment is used to analyse wavelength division multiplexing (WDM) transmission links at the physical layer of an AON testbed. The primary focus of the numerical modelling was the characterisation of signal degradation levels, link power budget and end-to-end physical connection for a typical metro environment. For the required end-to-end performance ( dBQ 5.7 ), the reachable transmission distance at both 2.5 Gbps and 10 Gbps data rate is investigated. The simulation results show that it is feasible to implement an AON connecting several research facilities in the same city. The outcome was applied to provide technical options for those facilities to connect together. The users can choose from two options: using directly a modulated laser at 2.5 Gbps or an external modulator at 10 Gbps, based on their bandwidth demands, cost constraints, and the distance to the access point. The results presented in this paper are also applicable for more general cases.

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