INTRODUCTION TO DWDM TECHNOLOGY DATA IN A RAINBOW PDF

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About the Author Preface Thousands of years ago someone tried to answer the question: Does light travel always in a straight line, even if in a transparent medium, or can it follow its curvature? Using a bucket of water with a hole at the bottom, he discovered the latter how simple!

Sunlight rays crossing the morning dew droplets formed a rainbow of colors. Thus the sun rays, composed of many colors, were demystified what a simple observation! Sun rays, when reflected with shining bronze shields, were redirected to selected points called estiai or foci. Furthermore, concentrated rays had so much energy that they could warm up things or burn them.

Soon thereafter, the glassy optical lens was produced. It was found that rays passing through a spherical lens did not create the best focal point; today, this imperfection is known as lens sphericity. It was also discovered that shapes based on hyperbolas or parabolas were better suited to optical applications than those based on circles or spheres. Simple experiments and observations of the past have helped our understanding about the nature of things.

The electronic properties of conductors and semiconductors help to create or detect light. Three crystals, each with different impurities and fused together, created a transistor, which within a few years revolutionized the way we live. The wrist-size communicator is no longer just fantasy in comic books.

Pocket-size powerful computers and credit-card-size communication devices are a reality. Low earth orbit satellite LEOS communication networks are not "pic in the sky," but they are roaming the silent skies. At the click of a button, one can access virtually any part of the globe and hear and see events as they happen. Optical fiber has wrapped around the globe like a ball of yarn connecting all continents and transporting data at the speed of light.

Direct-to-satellite communication enables anytime-wireless connectivity between any two places in the world, as well as providing global positioning services with accuracy of a few feet or inches! A single optical fiber can transport the information of hundreds of thousands of volumes within a second. My interest in optics continued during my graduate work when I combined electronics, materials, and interferometric techniques.

Subsequently, I had the opportunity to expand my understanding of multiwavelength transmission in optical media, now known as wavelength division multiplexing WDM , mainly through my active interest in this subject during my undergraduate and graduate studies.

Recently, I discovered that the notes I had been compiling over the years had current educational value, particularly in the area of DWDM. The intention of this book is to explain in simple language the properties of light, its interaction with matter, and how it is used to develop optical components such as filters, multiplexers, and others that are used in optical communications.

This book is not meant to replace related standards or to provide a complete mathematical analysis of each optical device, although mathematical relationships support some device functionality. DWDM is still evolving, and it is strongly recommended that the reader interested in the details of DWDM consult the most current updated standards.

I wish you happy and easy reading. Stamatios V.

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