A survey on Light-Path Elastic Optical Networks

High-bandwidth applications such as high-resolution television (HDTV), video conferencing, the Internet of things, and cloud computing are rapidly expanding, demands an increase in bandwidth demand in core optical networks. The existing dense wavelength-division multiplexing (DWDM) network works at a 50 GHz static grid channel frequency, resulting in spectrum waste at low bit rates. With 50 GHz channel spacing, it has a capacity of 0.8 Tb/s and can be increased twice with 25 GHz channel spacing. Considering that bit rates of 100Gb/s and greater must be handled by the same network in the future, it makes sense to “appropriately scale” the spectrum for each demand based on its bit rate and transmission distance (instead of forcing all demands to use more spectrum). Light routes, channels dynamically assigned frequency resources based on global telecommunication and traffic demands, are used to carry data in elastic optical networks. This study explains how the EON network emerged from the DWDM network, as well as the major characteristics and functionalities of the EON network. Examples include super channels and variable bandwidth transponders with sliceable bandwidth. Keeping the significance of an elastic optical network in mind, this paper investigates various encoding and communication methods of EONs. The lightpath algorithm's capabilities are described in detail in this review study. Further, it explore how elastic optical networking was used to address the acquisition and recovery of broken lightpaths in a post-disaster scenario's, minimizing optical amplifier power consumption while retaining frequency resources.