Bob Chomycz - Planning Fiber Optics Networks  

Planning Fiber Optic Networks

About the Author

Bob Chomycz is the founder and president of Telecom Engineering, Inc.; a company specializing in fiber optic telecommunications systems engineering and construction. He is the author of McGraw-Hills Fiber Optic Installers Field Manual.

Bob Chomycz

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The purpose of this book is to help the reader understand the details in planning and implementing fiber optic networks. Both short-reach and long-haul transmission links are discussed. All major fiber planning parameters are reviewed with appropriate background theory and practical design calculations. Guidelines are provided for planning both SONET/SDH and Ethernet networks. Practical examples are given to help the reader with theory application. The book is also easy to follow and concise. This helps the reader to quickly understand the technology without having to spend excessive time reading through copious text.

Planning Fiber Optic Networks can benefit the following professionals: engineers, network managers, planners, technicians, technologists students, and others interested in learning about this technology.

Suggestions and comments are always welcome. Please feel free to contact me at my email address shown below. I will do my best to try to respond to you in a timely fashion.

Bob Chomycz, P.Eng.

Telecom Engineering, Inc.

Telecom Engineering USA, Inc.

bchomycz@telecomengineering.com

www.TelecomEngineering.com

It is important to understand the basics of optical fiber signal propagation to be able to better apply fiber design principles. This chapter introduces the theory behind signal propagation in a single-mode fiber. Multimode fiber is not discussed in this book.

A single-mode fiber signal can be separated into two basic waveforms: the optical carrier and the information signal. The optical carrier is generated by a laser or LED in the transceiver and ideally has constant power (intensity), wavelength, and phase. The information signal is a waveform that contains serially encoded information that is transmitted in the fiber. Lets first consider the case of an optical carrier propagating in free space. It can be considered as a plane transverse electromagnetic (TEM) wave with the electric and magnetic field components represented by Eqs. (1.1) and (1.2),. The electric field exists in the x-z plane and the magnetic field exists in the y-z plane both propagating along the fibers z axis. Both electric and magnetic fields are perpendicular to the direction of propagation of the z axis and hence transverse. The components of these fields can be written as Eqs. (1.3), (1.4), and (1.5). Assume for now that the optical wave is monochromatic, consisting of just one wavelength. In reality this is not possible but is used here to help simplify the theory.