Abstract
The flexible optical networks are the promising solution to the exponential increase of traffic generated by telecommunications networks. They combine flexibility with the finest granularity of optical resources. Therefore, the flexible optical networks position themselves as a better solution than conventional WDM network. In the operational phase, traffic of connections fluctuates. In fact, the user’s need is not the same during day periods. Such traffic may experiment evidence of rising working hours, end of months or years and decreases during the night or on holidays. This variation requires the expansion or contraction of the number of frequency slots allocated to a connection to match the exact needs of the moment. The expansion of the traffic around the reference frequency of connection may lead to blockage because it must share frequency slots with neighboring connections in compliance with the constraints of continuity, contiguity, and non-overlapping. In this study, we offer a technique for allocating frequency slots for time-varying traffic connections. We share out the additional traffic load on different spectrum paths by respecting the constraint of time synchronization related to the differential delay to reduce the blocking rate due to traffic fluctuation.
Highlights
The flexible optical network constitutes an efficient alternative facing the exponential rise of traffic
We propose an optimization model with the objective of minimization blocking rate. We introduce in this model the concept of multi-spectrum bands and constraint of différential delay, due to: Group Velocity Delay (GVD), propagation delay and node latency
We address the problem of spectrum allocation to timevarying traffic connections with the distribution of traffic load during a specific time slot on multiple paths
Summary
The flexible optical network constitutes an efficient alternative facing the exponential rise of traffic. It includes two aspects that are the determination of physical path from the source to the destination of the connection and the determination of the frequency slots on that physical path which respects the constraints of flexible optical networks This problem known as Routing and Spectrum Allocation (RSA) is reckoned as np-hard [2]. This paper aims to contribute at solving that problem by developing a spectrum allocation mechanism which takes into account the possibility of sharing out traffic over different optical paths to reduce the blocking rate when the traffic of a connection undergoes a fluctuation. This mechanism is the multispectrum bands allocation; the frequency slots allocated to the connection are on different spectrum bands. We shall finish with a conclusion and provide perspectives for future works
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Advanced Computer Science and Applications
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
