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Chapter 21:
Single-Channel System Design
Abstract
Now that you have learned the ideas behind fiber-optic communication systems, it’s time to look at how they are designed. Design is a big topic, so it is split into two chapters. This chapter covers design of single-channel systems to meet loss and bandwidt requirements. Chapter 22 covers design considerations for wavelength-division multiplexing and optical networking. Loss budgets and transmission capacity, or bandwidth, are crucial in both single- and multichannel systems, but the basic principles are the same for both. You calculate loss budget to be sure that enough signal reaches the receiver to give adequate performance. Likewise, you must calculate pulse dispersion, or bandwidth, to be sure the system can transmit signals at the proper speed. Some simple guidelines will give you rough assessments. In the real world, you also must consider cost-effectiveness and make trade-offs among various approaches to find the best performance at the most reasonable cost. Single-channel design techniques can be applied to each channel in a multiwavelength system. These two chapters will not prepare you for heavy-duty system design. However, they will give you the basic understanding of design concepts and technical trade-offs you need to assess fiber-optic systems.
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CHAPTER 21
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