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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Equation (2-22) also defines the numerical aperture (NA) of a step-index fiber for
meridional rays: NA = « sin 0o,max = (n\ - /i^)1/2 % «, V2A (2-23) The
approximation on the right-hand side is valid for the typical case where A, as
defined by Eq.
Geometrical optics considerations show that light incident on the fiber core at
position r will propagate as a guided mode only if it is within the local numerical
aperture NA(r) at that point. The local numerical aperture is defined as44 NA(r) ...
These include variations in core diameter, core-area ellipticity, numerical
aperture, refractive-index profile, and core-cladding concentricity of each fiber.
Since these are manufacturer-related variations, the user generally has little
control over ...
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Overview of Optical Fiber Communications
Structures Waveguiding and Fabrication
Signal Degradation in Optical Fibers
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