Abstract
The next generation network (NGN) and the speed-up of access lines will
sharply increase the demand for one-way applications such as internet protocol
television (IP TV) and video on demand (VOD). One-way applications make the
downlink bandwidth much larger than the uplink bandwidth. Asymmetric traffic
is best supported by using different numbers of wavelengths in the uplink
and downlink, which presumes the use of a wavelength division multiplexing
(WDM) network. Unfortunately, the existing 2- or 4-fiber ring network architecture
is symmetric, and so it cannot efficiently accommodate asymmetric paths. This
paper proposes a novel 1-fiber WDM protection ring that offers a cost-effective
optical network architecture for asymmetric traffic as well as symmetric traffic.
It also proposes a new 1:1 protection switching scheme and automatic protection
switching (APS) control protocol that can reduce capital expenditures for
optical-electro-optical termination cards and provide nonrevertive protection
switching with extra traffic and APS with end-to-end supervision including
optical switching fabrics. Moreover, this paper shows that the proposed wavelength
switching scheme offers much better network survivability after multiple wavelength
failures than the existing bidirectional switching scheme can offer.
© 2009 IEEE
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