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Proceedings Paper

Reliability of an unprotected optical-ring network
Author(s): Torbjorn K. Svensson; Bjorn Hermansson
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Paper Abstract

In this paper the reliability is calculated of an all- optical C-band, 45-carrier WDM ring network comprising a large number of gain-flattened EDFA amplifiers and 10 add/drop nodes with full connectivity. A ring of the assumed type and size would cover a region surrounding the Baltic Sea, forming the top layer of a hierarchical network. Protection switching is technically uncomplicated but expensive, and may cause transmission problems due to the long distances involved. In order to estimate the reliability of the ring, the FIT number for longest optical paths is calculated and compared with requirements according to ETSI standard, a priori assuming that neither diversity, nor protection switching is available. This is obviously true for a single fiber ring in which all aggregated traffic is unidirectionally routed. From the architecture chosen follows that certain components will be crucial for the network's performance. In this context, pairs of co-working pump lasers may provide a sort of redundancy which would be a useful means to improve the reliability of the network. With this in mind, the network's resilience to non- catastrophic component failures has been simulated, with a focus on pump- and signal lasers. The global effects on optical SNR and power due to single- and multiple failures of these components are studied for arbitrary local combinations. The study enlightens a network mechanism for spectral distortion caused by pump failure, and an efficient remedy to significantly restore the signal quality.

Paper Details

Date Published: 13 December 1999
PDF: 12 pages
Proc. SPIE 3861, Gigahertz Devices and Systems, (13 December 1999); doi: 10.1117/12.373009
Show Author Affiliations
Torbjorn K. Svensson, Telia Research AB (Sweden)
Bjorn Hermansson, Telia Research AB (Sweden)

Published in SPIE Proceedings Vol. 3861:
Gigahertz Devices and Systems
Dwight C. Streit, Editor(s)

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