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Understanding Light
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In 2 we focus, no pun intended, on developing an appreciation for a phenomenon that we take for granted and of which we see only a portion That phenomenon is light In 2 we will examine the frequency spectrum, noting the different bands in the spectrum such as visible light, ultraviolet light, gamma rays, and other bands that students usually first became acquainted with during high school or college physics We will also review a variety of terms associated with light and will discuss power measurements that are important for determining the performance level of an optical transmission system
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Understanding Fiber
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For light to act as an optical transmission system, it must flow on a medium That medium is fiber which is the topic of 3 In that chapter ,
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we will discuss the different types of fiber that can be used in an optical transmission system, how light flows down and through each type of fiber and the advantages and disadvantages associated with the use of each , type of fiber Because it is important to understand the transmission characteristics of light as it flows into and through a fiber we will also exam, ine many terms associated with light distribution in a fiber Other topics covered in 3 include a brief introduction to the increased transmission capacity of a fiber through wavelength division multiplexing (WDM) and dense wavelength division multiplexing (DWDM)
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Like any type of transmission system, an optical transmission system requires a transmitter and a receiver The transmitter is the light source; the receiver is an optical detector also referred to as a photodetector Thus, , in 4 we will describe the operation of light-emitting diodes (LEDs) and lasers as well as different types of optical detectors
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Beginning in 5, we discuss applications that use optical transmission systems In that chapter we will examine the use of optical transmission in the local area network, investigating how one version of Fast Ethernet and several versions of Gigabit Ethernet are dependent on the use of fiber In addition, we will also summarize the functions of the fiber channel, which enables high-speed access between computers and data storage and represents the cornerstone of storage area network communications
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Fiber in the W AN
Once we discuss the practical use of fiber in the local area network, we will focus on the wide area network In 6 we will discuss and describe the Synchronous Optical Network (SONET) and its European counterpart, the Synchronous Digital Hierarchy (SDH) We will also examine WDM and DWDM in more detail and an evolving technology referred to as the Internet Protocol (IP) over SONET
Introduction
Fiber in the Neighborhood
The growth in the use of digital subscriber line (DSL) and cable modems requires telephone companies and cable operators to route fiber into neighborhoods to satisfy the increased transmission requirements of subscribers Thus, in 7 we will examine the technology that we can collectively refer to as fiber to the neighborhood
Fiber in the Building
No book covering optical transmission components would be complete without discussing the use of fiber within a building In 8, our concluding chapter, we will examine the use of fiber modems, fiber multiplexers, and even WDM within a building
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Team-Fly
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CHAPTER
Understanding Light
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Two
Information is transmitted over different types of fiber by means of light If we compare fiber to a copper conductor, we can note several similarities between the two In a fiber environment, a light source replaces the electronic transmitter that generates pulses and is used by a copper-based digital transmission system, while the conductor is a glass or plastic fiber in place of a twisted-pair wire or coaxial-cable conductor Because of the central role of light in a fiber-optic transmission system, it is important to inquire into what we normally take for granted In this chapter we will literally focus our eyes and attention on light In so doing, we will discuss how light can be described in terms of particles and waves, and where different colors are located in the frequency spectrum As we discuss light we will introduce several terms that may appear new to many readers while serving as a refresher for others Because this book is oriented toward communications applications, we will also discuss such terms as bandwidth, signaling rates, power measurements, and channel capacity One or more topics covered in this chapter may leave you scratching our head in an attempt to determine how the topic relates to communications over a fiber To paraphrase Indiana Jones, this author will say Trust me ,
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