Architecture Design And Performance Evaluation Of SD-EON System

With the exponentially growing of information speed, modern society has stepped into the age of big data. Requests of users are becoming more random, sudden and various. To compete with the fast growing bandwidth requirement and high flexibility of novel kinds of business, the next generation optical network will evolve into the version of extremely high speed, high spectrum efficiency, multi-scenario suitable, energy-efficiency and high scalability. Elastic optical network is becoming one of the most promising candidates of next generation optical network due to its high spectrum granularity and flexible bandwidth allocation. At the same time, the spring up of software-defined networking break up the stereotype of traditional networks. Its centralized controlling and management and open-styled networking function design have provided feasible scheme for the development of elastic optical networks.So based on the developing trend of future optical networks, this article proposed a novel architecture of software-defined elastic optical network applied for the scenario of metro/access network system. In this network, centralized controlling and management mode of SDN system is adopted. Meanwhile, higher granularity of spectrum resources and multi-layer resource allocation forms from wavelengths to sub-wavelengths has been achieved with the aid of OFDM technology and reconfigurable optical switches like ROADM.Addressing the resource distribution feature under EON system structure, a novel kind of 3D global resource management model is proposed based on time domain, wavelength domain, and OFDM subcarrier domain respectively. Based on the established 3D-model, the fragmentation definition and theoretical analysis is given. With the function of global spectrum efficiency, an improved dynamic bandwidth allocation algorithm--the LFF algorithm has been proposed. The algorithm proves a notable decrease in spectrum fragmentation and system blocking rate through matlab simulation, thus helping improve the spectrum efficiency and compatibility for elastic bandwidth requests.This article has also provided the transmission performance of designed system—the WDM-OFDM-PON based EON system and the VCSEL optical injection locking based RoF system with improved optical heterodyne scheme. The results of BER and eye diagram prove good transmission performance of proposed system within access network distance.In summary, the design and evaluation of proposed SD-EON system has reference value for the developing mode of next generation optical network.