1. Introduction

1. Introduction EE466 Fall 2007

Communication Links EE466 Fall 2007

Undersea Optical Fiber Backbones EE466 Fall 2007

Fiber Data Rate EE466 Fall 2007

Fiber Capacity http://www.laserfocusworld.com/articles/article_display.html?id=277158 EE466 Fall 2007

Multiplexing EE466 Fall 2007

TDM Standards • Standards developed for optical fiber communications rates • Synchronous Optical NETwork (SONET) • Synchronous Digital Hierarchy (SDH) EE466 Fall 2007

Optical Signal • Optical signals are typically sent using on-off keying (OOK) • Power received: 1 • No power: 0 • Two primary formats • Nonreturn to zero (NRZ) • Return to zero (RZ) EE466 Fall 2007

Basic Optical Communication Link • Electrical signal transferred to another location • Electrical-to-Optical (E-O) conversion • Modulated laser • Signal transmission • Optical fiber • Optical-to-Electrical (O-E) conversion • Detector EE466 Fall 2007

Signal Transmission • Signal is attenuated as it propagates through the fiber • Decrease in signal amplitude • Reduction in signal-to-noise ratio (SNR) • Pulse is spread in time • Called signal dispersion • Causes inter-symbol interference (ISI) EE466 Fall 2007

Additional Components • External modulator • Better signal—lower signal dispersion • Optical amplifier • Amplifies signal to overcome attenuation EE466 Fall 2007

Topics to be Covered • Fibers • Attenuation • Dispersion • Sources • Detectors • System performance EE466 Fall 2007

1. Introduction

1. Introduction

Presentation Transcript

1. Introduction

1. INTRODUCTION

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CH.1 Introduction 1-1 Introduction

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1. INTRODUCTION

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1 INTRODUCTION