Optical Switching

16Protection, Restoration, and Improvement

Arighna Basak¹ and Angsuman Sarkar²

¹ Department of Electronics and Communication Engineering, Brainware University, Kolkata, West Bengal, India

² Department of Electronics and Communication Engineering, Kalyani Government Engineering College, Kalyani, West Bengal, India

16.1 Introduction

Thanks to the convergence of information and communications technology and the rapid growth of fiber‐optic communication systems, today's telecommunications systems can provide end users with fast, high‐quality services. The type of service has expanded from voice‐only to include a extensive range of multimedia options. As the quantity of corporate customers involved continues to grow, even a minor interruption in service can have a serious impact. Therefore, how to avoid service interruption and keep service loss low becomes an important issue when it is unavoidable; in other words, survivability must be built into the architecture of the telecommunications network. The capability of the network to deliver uninterrupted services in the event of failure is called survivability. Due to its benefits in ability, dependability, cost, and scalability, optical fiber has become the main means of transmission in telecommunications networks. The incredible high capacity of optical fiber (several megabits per second) is one of its most attractive features. The only medium that can provide high‐bandwidth services at a reasonable cost is optical fiber. Optical ...