BEC701 - FIBRE OPTIC COMMUNICATION

BEC701 - FIBRE OPTIC COMMUNICATION

UNIT-I INTRODUCTION TO OPTICAL FIBER

? Evolution of fiber Optic system ? Element of an Optical Fiber Transmission link ? Ray Optics ? Optical Fiber Modes and Configurations ? Mode theory of Circular Wave guides ? Overview of Modes ? Key Modal concepts ? Linearly Polarized Modes ? Single Mode Fibers ? Graded Index fiber structure

Introduction

? An optical Fiber is a thin, flexible, transparent Fiber that acts as a waveguide, or "light pipe", to transmit light between the two ends of the Fiber.

? Optical fibers are widely used in Fiber-optic communications, which permits transmission over longer distances and at higher bandwidths (data rates) than other forms of communication.

? Fibers are used instead of metal wires because signals travel along them with less loss and are also immune to electromagnetic interference.

Evolution of fiber Optic system

First generation ? The first generation of light wave systems uses GaAs

semiconductor laser and operating region was near 0.8 m. Other specifications of this generation are as under: ? i) Bit rate : 45 Mb/s ? ii) Repeater spacing : 10 km

Second generation i) Bit rate: 100 Mb/s to 1.7 Gb/s ii) Repeater spacing: 50 km iii) Operation wavelength: 1.3 m iv) Semiconductor: In GaAsP Third generation i) Bit rate : 10 Gb/s ii) Repeater spacing: 100 km iii) Operating wavelength: 1.55 m

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