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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The maximum tuning range depends on the optical output power, with a larger
output level resulting in a narrower tuning range. Figure 10-20 illustrates the
tuning range of an injection- tunable three-section DBR laser. 1562 10 20 30 40
50 60 ...
The tuning range AAtune can be estimated by AA.tune AĞefT (10-61) where AĞ
efr is the change in the effective refractive index. Practically, the maximum index
change is around 1 percent, resulting in a tuning range of 10-15 nm. Figure 10-
Two important performance parameters of an OTDR are dynamic range and
measurement range.47 Dynamic range is defined as the difference between the
initial backscatter power level and the noise level after 3 minutes of measurement
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Overview of Optical Fiber Communications
Structures Waveguiding and Fabrication
Signal Degradation in Optical Fibers
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