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Quantifying the benefit of wavelength add-drop in WDM rings with distance-independent and dependent traffic

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3 Author(s)
Simmons, Jane M. ; AT&T Bell Labs., Rad Bank, NJ, USA ; Goldstein, E.L. ; Saleh, A.A.M.

One drawback to deploying wavelength division multiplexed (WDM) synchronous optical network (SONET) rings is the potentially large amount of equipment necessary for their deployment. Wavelength add-drop multiplexers potentially reduce the amount of required SONET terminal equipment by allowing individual wavelengths to optically bypass a node rather than being electronically terminated. We have quantified the maximum terminal-equipment savings attainable using wavelength add-drop for rings carrying uniform traffic and rings carrying distance-dependent traffic. The analysis makes use of both an enumerative methodology, and a “super-node” approximation technique that is applicable to arbitrary ring size and internode demand. In both the uniform and distance-dependent traffic scenarios, maximum terminal-equipment savings are shown to rapidly increase, over the region of interest, with both network size and internode demand. The value of wavelength add-drop is accordingly expected to grow rapidly in rings interconnecting numerous high-capacity nodes

Published in:

Lightwave Technology, Journal of  (Volume:17 ,  Issue: 1 )

Date of Publication:

Jan 1999

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