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Proceedings Paper

Constraint-based routing in path-protected translucent optical networks considering fiber nonlinearities and polarization mode dispersion
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Paper Abstract

In this paper we present a novel physical layer impairment (PLI) aware routing and wavelength assignment (RWA) approach combined with PLI-aware regenerator placement. We consider the dominant linear and nonlinear signal quality degrading effects in 10 Gb/s non-return to zero (NRZ) on-off keying (OOK) systems by analytical models for amplified spontaneous emission noise (ASE), filter crosstalk, group-velocity dispersion (GVD) and polarization mode dispersion (PMD) as well as cross-phase modulation (XPM) and four wave mixing (FWM). As a topology for our study we have chosen the COST266 reference network, which is a pan-European meshed network with a total of 28 nodes and 41 (bidirectional) edges. For this network demands have been defined based on a population-based model. To facilitate transmission over very long path lengths regenerator pools have been placed sparsely at certain nodes due to cost considerations. The regenerator sites are selected based on a heuristic algorithm taking into account the physical effects resulting in signal quality degradation. Due to the high cost of optical-electrical-optical (OEO) conversion as few regenerators as possible are deployed. In our investigations we assumed a 1+1 path protection scheme in the optical layer. The exact assessment of the signal quality based on the current traffic situation using our methods permits a network performance (wavelength blocking probability) comparable to an opaque network with only a small number of regenerators.

Paper Details

Date Published: 11 November 2008
PDF: 10 pages
Proc. SPIE 7136, Optical Transmission, Switching, and Subsystems VI, 71364M (11 November 2008);
Show Author Affiliations
Stephan Pachnicke, Dortmund Univ. of Technology (Germany)
Peter M. Krummrich, Dortmund Univ. of Technology (Germany)

Published in SPIE Proceedings Vol. 7136:
Optical Transmission, Switching, and Subsystems VI
Ken-ichi Kitayama; Pierpaolo C. Ghiggino; Kim Roberts; Yikai Su, Editor(s)

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