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 mean-square thermal noise current for the receiver is found from Eq. (6-17)
as (J?) = = 4(1.38* 10-^(293 K)2Q x Hz = 323 x 10"18A2 or (4) 1/2 = 18 nA Thus,
for this receiver the rms thermal noise current is about 14 times greater than the ...
signal-to-noise ratio degradation caused by thermal noise in the receiver
electronics can be suppressed. Compared with other front-end devices, such as
avalanche photodiodes or optical heterodyne detectors, an optical preamplifier
where *+^ + ff)'2 + ^W (7-46) is a dimensionless parameter characterizing the
thermal noise of the receiver. We shall call this parameter the thermal noise
characteristic of the receiver amplifier. Since the signal and noise voltages in Eq.
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Overview of Optical Fiber Communications
Structures Waveguiding and Fabrication
Signal Degradation in Optical Fibers
12 other sections not shown