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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1 Laser Diode Modes and Threshold Conditions For optical fiber communication
systems requiring bandwidths greater than approximately 200 MHz , the
semiconductor injection laser diode is preferred over the LED . Laser diodes
This value sets the upper limit to the direct modulation capability of the laser
diode . A laser diode can readily be pulse - modulated since the photon lifetime is
much smaller than the carrier lifetime . If the laser is completely turned off after
Relaxation - oscillation peak Relative intensity 3 GHz Modulation frequency
FIGURE 4 - 30 Example of the relaxation - oscillation peak of a laser diode .
diodes makes the implementation of analog intensity modulation susceptible to
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Overview of Optical Fiber Communications
Structures Waveguiding and Fabrication
Signal Degradation in Optical Fibers
14 other sections not shown