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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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
The amount of nth - order distortion in decibels is given by An nth - order
harmonic distortion = 20 log ( 4-56 ) Ai To determine intermodulation distortion ,
the modulating signal of a nonlinear device is taken to be the sum of two cosine
waves X ...
0 10 - Second harmonic distortion Imod = 150 mA 20 Prz / Pn ( dB ) 30 40 6 MHz
8 MHz 4 MHz 1 MHz 0.5 MHz 50 60 ... and third - order harmonic distortions as a
function of bias current in a GaAlas LED for several modulation frequencies .
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Overview of Optical Fiber Communications
Structures Waveguiding and Fabrication
Signal Degradation in Optical Fibers
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