Sharing of functionalities and sharing of network
resources are effective solutions for improving the
cost-effectiveness of wavelength-switched optical networks
(WSONs). Such cost-effectiveness should be pursued together
with the objective of ensuring the requested level of performance
at the physical layer (i.e., quality of transmission,
QoT) and at the upper layer also in the case of a failure
(i.e., survivability). This paper aims to apply the sharing
concept to a WSON with QoT and survivability requirements
(against single-link failures). QoT is guaranteed by resorting
to regeneration of the optical signal in intermediate nodes.
Survivability is guaranteed by resorting to path protection.
To exploit the sharing benefits, the scarce regenerators are
used for both regeneration and wavelength conversion (WC)
leading to a sharing of functionalities. Also, the shared path
protection mechanism is exploited to ensure survivability
against single-link failures and make the sharing of network
resources (regenerators and wavelengths) possible. The paper
presents a novel distributed scheme (DISTR) for reservation
of regenerators and wavelengths in generalized multi-protocol
label switching controlled WSONs, in order to ensure the
required level of QoT and survivability. Novel objects and
selection strategies for the resource reservation protocol with
traffic engineering extensions are proposed and evaluated.
The DISTR scheme effectively combines regeneration and WC
points, leading to a noticeable reduction of the regeneration
usage with respect to the existing schemes. Moreover, a
significant reduction of the blocking probability is achieved,
independently of the wavelength selection strategy used.
This paper was published in Journal of Optical Communications and Networking and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jocn-4-3-219. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.