Abstract
Physical impairments originating from optical fiber components and intermediate
switching nodes can be the dominant reason calls are blocked in wide-area all-optical
wavelength division multiplexing (WDM) networks. When a centralized network controller
is used, estimating the impact of the physical impairments on the quality of a lightpath
before provisioning it can cause a significant delay. In this paper, quality of service
aware wavelength assignment algorithms are proposed that consider both bit-error rate
(BER) and latency constraints. A novel wavelength assignment technique called wavelength
ordering is shown via simulation to reduce the call blocking probability resulting from
both physical impairments and excessive processing delay caused by channel BER
estimation.
© 2009 IEEE
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