MIGRATION TO NEXT GENERATION OPTICAL NETWORK OFDM based ElASTIC OPTICAL NETWORK Varsha Lohani Ph.D Scholar Electrical Engineering Indian Institute of Technology Kanpur, Uttar Pradesh-208016 Email: lohani@iitk.ac.in Y.N.Singh Professor Electrical Engineering Indian Institute of Technology Kanpur, Uttar Pradesh-208016 Email: ynsingh@iitk.ac.in Abstract—The rapid growth in the data traffic lead to the need of optical network that operates beyond 100 Gbps and one of the network that we are going to discuss in this paper is Elastic Optical Network (EON). The multiplexing technique efficient for EON is Optical Orthogonal Frequency Division Multiplexing because of its high spectral efficiency, robustness against inter- carrier and inter-symbol interference. In this paper, we are going to present a survey on O-OFDM based EON, Routing and spectrum assignment and Survivability in EON. I. I NTRODUCTION The data traffic growth in worldwide is increasing day by day so there is a requirement of optical network which can support high bandwidth, high speed data transmission, and is cost effective. To accommodate high capacity demand i.e., beyond 400 Gbps, elastic optical networks can be used. OFDM based EON is very efficient technology as it focuses on OFDM technology, and its flexible properties. OFDM based EON has various advantages as compared to previous optical networks vig., segmentation of Bandwidth, aggregation of Bandwidth, accommodation of multiple data rates, energy efficiency and virtualization. Fig.1 shows comparison between conventional and elastic optical paths [1, 2]. II. ELASTIC OPTICAL NETWORK (EON) ARCHITECTURE The elastic optical network is very useful in order to fulfill the need of increasing bandwidth demands because of its flexible data rate and spectrum allocation, low signal attenuation, low signal distortion, low power requirement as some subcarriers can be switched off when not required, low use of material, small space requirement and low cost. In this section we are going to discuss about architecture of elastic optical network as shown in Fig.2 [3] and its various components (sliceable bandwidth variable transponder and bandwidth variable wavelength cross-connect). Fig. 1. Comparison between conventional and elastic optical paths reproduce from [1, 2]. Fig. 2. Architecture of Elastic Optical network. A. Components of EON The two main components of EON are (i) Sliceable Band- width Variable Transponder (ii) Bandwidth Variable- Cross Connects. 1) Sliceable Bandwidth Variable Transponder(S-BVT): SBVT can tune optical bandwidth and transmission reach by