A Survey on OFDM-Based Elastic Core Optical Networking

Abstract

Abstract-Orthogonalfrequency-division multiplexing (OFDM) is a modulation technology that has been widely adopted in many new and emerging broadband wireless and wireline communication systems. Due to its capability to transmit a high-speed data stream using multiple spectral-overlapped lower-speed subcarriers, OFDM technology offers superior advantages of high spectrum efficiency, robustness against inter-carrier and inter-symbol interference, adaptability to server channel conditions, etc. In recent years, there have been intensive studies on optical OFDM (O-OFDM) transmission technologies, and it is considered a promising technology for future ultra-high-speed optical transmission. Based on O-OFDM technology, a novel elastic optical network architecture with immense flexibility and scalability in spectrum allocation and data rate accommodation could be built to support diverse services and the rapid growth of Internet traffic in the future. In this paper, we present a comprehensive survey on OFDM-based elastic optical network technologies, including basic principles of OFDM, O-OFDM technologies, the architectures of OFDMbased elastic core optical networks, and related key enabling technologies. The main advantages and issues of OFDM-based elastic core optical networks that are under research are also discussed.

Recent Advances in Elastic Optical Networking

“…If network topology, number of optical path demands, and available spectrum resource are small compared to computing resources, the problem can be solved optimally in reasonable time; otherwise the approach becomes impractical. One way to resolve this issue is to divide the problem into smaller sub-problems and solve them sequentially, such as determining route first and then assigning spectra to the routes [5], [10]. Another way is to adopt LP-relaxation, which solves ILP without demanding integer variables [8].…”

“…Some situations assume the removal of optical paths because of service termination or link/node failure, which forces the online RSA to be even more dynamic. ILP may be not suitable for the on-line RSA, because ILP does not guarantee optimum solutions [10].…”

Spectrum Continuity and Contiguity based Dedicated Protection for Flexible Optical Networks

“…In such new architectures, the management layer and network elements support flexible bandwidth for the channels, which are adjusted according to the characteristics of the network requests. Elastic optical networks (EONs) have been proposed as a promising candidate for high transmission rates in adaptive optical transport networks [3]. Some recently…”

Bufferless Bidirectional Multi-Ring Networks with Sharing an Optical Burst Mode Transceiver for Any Route

“…Moreover, it is predicted that optical networks will be required to support Tbps class transmission in the near future [4]. In response to this, research and development are also progressing [5] according to these requirements. On the other hand, the requirements for the future internet will severely affect the access network and the aggregation network.…”