Optical fiber communications
The third edition of this popular text and reference book presents the fundamental principles for understanding and applying optical fiber technology to sophisticated modern telecommunication systems.
Optical-fiber-based telecommunication networks have become a major information-transmission-system, with high capacity links encircling the globe in both terrestrial and undersea installations. Numerous passive and active optical devices within these links perform complex transmission and networking functions in the optical domain, such as signal amplification, restoration, routing, and switching. Along with the need to understand the functions of these devices comes the necessity to measure both component and network performance, and to model and stimulate the complex behavior of reliable high-capacity networks.
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However, it has generally been observed that the loss increases with increasing
mode number.25 33 3.2 SIGNAL DISTORTION IN OPTICAL WAVEGUIDES An
optical signal becomes increasingly distorted as it travels along a fiber.
3.2.7 Intermodal Distortion The final factor giving rise to signal degradation is
intermodal distortion, which is a result of different values of the group delay for
each individual mode at a single frequency. To see this pictorially, consider the ...
This effect is known as harmonic distortion. The amount of wth-order distortion in
decibels is given by ęth-order harmonic distortion = 20 log— (4-56) A\ To
determine intermodulation distortion, the modulating signal of a nonlinear device
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Overview of Optical Fiber Communications
Structures Waveguiding and Fabrication
Signal Degradation in Optical Fibers
12 other sections not shown