Optical Power Control in Translucent Flexible Optical Networks With GMPLS Control Plane

Abstract

Abstract-The continuously increasing traffic of Internet services (cloud services, video streaming, social networks and recently Internet of things services) is leading to a huge traffic growth in the core optical networks. This traffic evolution is pushing network operators to exploit efficiently their infrastructures in order to postpone, as much as possible, the expensive deployment of new infrastructures. In this respect, the migration from fixed to flex-grid optical networks was triggered in order to efficiently use optical network capacity taking benefits from the improved spectral efficiency of flexible transponders. In our previous work [1], we demonstrated that migrating towards flexible networks while keeping in use existing optical amplifiers will cause power saturation problem over highly loaded links due to the increase in the number of optical channels. To overcome this problem, we proposed in [1] a power adaptation process that consists on converting transmission performance margins into optical power attenuation over optical links. However, the realized work considered only transparent optical network controlled by GMPLS protocol suite. In this paper, we consider the case of translucent optical network where optical regeneration is required and thus the power adaptation process is adapted to such kind of network. New routing algorithm and protocol extensions are proposed to take into account power and regeneration information in the GMPLS control plane of translucent networks.

Heuristic Chaotic Hurricane-Aided Efficient Power Assignment for Elastic Optical Network

“…T is the optical power vector and p i the transmitted optical power for the ith lightpath, subject to the constraints related to power budget and SNR required to achieve QoT [3]; moreover, ξ min i is the requirement minimum bit-rate, p min and p max is the minimum and maximum value considered as allowable transmitted power, respectively.…”

“…In the EONs, the lightpaths with adjustable bandwidth, modulation level and spectrum assignment can be established according to actual traffic demands and quality of service (QoS) requirements [1], [2]. In addition, the quality of transmission (QoT) of each lightpath is evaluated previously to resources allocation purpose, as well as to obtain reliable optical connectivity [2], [3]. The best knowledge of the QoT is needed in the design and operation phases, owing to the margin has to be added in the network when the QoT is not well established [4].…”

“…approximated formulas and optical performance monitors (OPMs) [4], [5]. The QoT estimation with OPMs distributed in the route or in the coherent receiver can be appropriated in term of precision and computational complexity (CC) when integrated in to the active control plane to provide the link conditions in real time [1], [3]. However, it is important to consider the limited accuracy of the OPMs that increase the measurements uncertainty considering the channel impairments (including linear and nonlinear effects), receiver architecture and noise, which decrease the performance of the channel state estimation [5], [6].…”

Heuristic Chaotic Hurricane-aided Efficient Power Assignment for Elastic Optical Networks

“…T is the optical power vector and p i the transmitted power for the ith lightpath, subject to the constraints related to power budget and SNR required to achieve QoT [3]; moreover, ξ min i is the SNR rate supported transmission, p min and p max is the minimum and maximum value considered as allowable transmitted power, respectively.…”

“…The QoT estimation with OPMs distributed in the route or in the coherent receiver can be appropriated in term of precision and computational complexity when integrated in Taufik Abrão is with the Department of Electrical Engineering, Londrina State University, Parana, Brazil e-mail: taufik@uel.br. Layhon R. R. dos Santos are with the Department of Electrical Engineering, Technological Federal University, Cornélio Procópio, Parana, to the active control plane to provide the link conditions in real time [1] [3]. However, it is important to consider the limited accuracy of the OPMs that increase the measurements uncertainty considering the channel impairments (including linear and nonlinear effects), receiver architecture and noise, which decrease the performance of the channel state estimation [5] [6].…”