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weakened optical signal is pumped into the ingress edge of a semiconductor optical amplifier. The active layer of the semiconductor substrate amplifies the signal and regenerates it on the other side. The primary downside to these devices is their size. They are small, and their light-collecting capabilities are therefore somewhat limited. A typical single-mode fiber generates an intense spot of light that is roughly 10 microns in diameter. The point upon which that light impinges upon the semiconductor amplifier is less than a micron in diameter, meaning that a lot of the light is lost. Other problems also crop up, including polarization issues, reflection, and variable gain. As a result, these devices are not in widespread use; EDFAs and Raman amplification techniques are far more common.
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So far, we have discussed the sources of light, including LEDs and laser diodes. We have briefly described the various flavors of optical fiber and the problems they encounter as transmission media. Now we turn our attention to the devices that receive the transmitted signal. The receive devices used in optical networks have a single responsibility: to capture the transmitted optical signal and convert it into an electrical signal that can then be processed by the end equipment. Various stages of amplification may be used to ensure that the signal is strong enough to be acted upon, and demodulation circuitry may be used to recreate the originally transmitted electronic signal.
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Although many different types of photosensitive devices exist, two are used most commonly as photodetectors in modern networks: positiveintrinsic-negative (PIN) photodiodes and avalanche photodiodes (APDs). Positive-Intrinsic-Negative (PIN) Photodiodes PIN photodiodes are similar to the device described previously in the general discussion of photosensitive semiconductors. Reverse biasing the junction region of the device prevents a current flow until light at a specific wavelength strikes the substance, creating electron-hole pairs and enabling the current to flow across the three-layer interface in proportion to the intensity
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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of the incident light. Although they are not the most sensitive devices available for the purpose of photodetection, they are perfectly adequate for the requirements of most optical systems. In cases where they are not considered sensitive enough for high-performance systems, they can be coupled with a preamplifier to increase the overall sensitivity. Avalanche Photodiodes (APDs) APDs work as optical signal amplifiers. They use a strong electric field to perform what is known as avalanche multiplication. In an APD, the electric field causes current accelerations such that the atoms in the semiconductor matrix get excited and create, in effect, an avalanche of current to occur. The good news is that the amplification effect can be as much as 30 to 100 times the original signal; the bad news is that the effect is not altogether linear and can create noise. APDs are sensitive to temperature and require a significant voltage to operate them, 30 to 300 volts depending on the device. However, they are popular for broadband systems and work well in the gigabit range. We have now discussed transmitters, fiber media, and receivers. In the next section, we examine the fibers themselves and how they have been carefully designed to serve as solutions for a wide variety of networking challenges and to forestall the impact of the nonlinearities described in this section.
Optical Fiber
As mentioned briefly in a prior section, fiber has evolved over the years in a variety of ways to accommodate both the changing requirements of the customer community and the technological challenges that emerged as the demand for bandwidth climbed precipitously. These changes came in various forms of fiber that presented different behavior characteristics to the market.
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