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LEDs and IREDs Depending on the exact mixture of semiconductors used in manufacture, visible light of almost any color can be produced by diodes when bias is applied to them in the forward direction. Infraredemitting devices also exist. The most common color for a light-emitting diode (LED) is bright red. An infrared-emitting diode (IRED) produces energy at wavelengths slightly longer than those of visible red light. The intensity of the radiant energy from an LED or IRED depends to some extent on the forward current. As the current rises, the brightness increases, but only up to a certain point. If the current continues to rise, no further increase in brilliance takes place. The LED or IRED is then said to be in a state of saturation. Digital Displays Because LEDs can be made in various different shapes and sizes, they are ideal for use in digital displays. You ve seen digital clock radios that use them. They are common in car radios. They make good indicators for on/off, a.m./p.m., battery low, and other conditions. In recent years, LED displays have been largely replaced by liquid crystal displays (LCDs). The LCD technology has advantages over LED technology, including lower power consumption and better visibility in direct sunlight. However, LCDs require backlighting when the ambient illumination is low.

It wasn t too long ago that vacuum tubes were the backbone of electronic equipment. Even in radio receivers and portable television sets, all of the amplifiers, oscillators, detectors, and other circuits required these devices. A typical vacuum tube ranged from the size of your thumb to the size of your fist. A radio might sit on a table in the living room; if you wanted to listen to it, you would turn it on and wait for the tube filaments to warm up. I can remember this. It makes me feel like an old man to think about it. Vacuum tubes, sometimes called tubes or valves (in England), are still used in some power amplifiers, microwave oscillators, and video display units. There are a few places where tubes work better than semiconductor devices. Tubes tolerate momentary voltage and current surges better than semiconductors. They are discussed in chapter 29. Tubes need rather high voltages to work. Even in radio receivers, turntables, and other consumer devices, 100 V to 200 V dc was required when tubes were employed. This mandated bulky power supplies and created an electrical shock hazard.

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at the zero-dispersion point. Thus, the intentional inclusion of a small amount of chromatic dispersion actually helps to reduce the effects of FWM. For this reason, fiber manufacturers sell NZDSF, which moves the dispersion point to a point near the zero point, thus ensuring that a small amount of dispersion creeps in to protect against FWM problems. Another factor that can minimize the impact of FWM is to widen the spacing between DWDM channels. This, of course, reduces the efficiency of the fiber by reducing the total number of available channels and is therefore not a popular solution, particularly because the trend in the industry is to move toward narrower channel spacing as a way to increase the total number of available channels. Already several vendors have announced spacing as narrow as 5 GHz. Finally, large effective area fibers tend to suffer less from the effects of FWM.

Recall the planes for resistance (R) and inductive reactance (XL) from chapter 13. This is the same as the upper-right quadrant of the complex-number plane shown in Fig. 15-2. Similarly, the plane for resistance and capacitive reactance (XC) is the same as the lower-right quadrant of the complex number plane. Resistances are represented by nonnegative real numbers. Reactances, whether they are inductive (positive) or capacitive (negative), correspond to imaginary numbers.

Communications Both LEDs and IREDs are useful in communications because their intensity can be modulated to carry information. When the current through the device is sufficient to produce output, but not enough to cause saturation, the LED or IRED output follows along with rapid current changes. Analog and digital signals can be conveyed over light beams in this way. Some modern telephone systems make use of modulated light, transmitted through clear fibers. This is known as fiber-optic technology. Special LEDs and IREDs produce coherent radiation. These are called laser diodes. The rays from these diodes aren t the intense, parallel beams that most people imagine when they think about lasers. A laser LED or IRED generates a cone-shaped beam of low intensity. But it can be focused into a parallel beam, and the resulting rays have some of the same advantages found in larger lasers, including the ability to travel long distances with little decrease in their intensity.

In the same way that cross-phase modulation results from interference between multiple simultaneous signals, intermodulation causes secondary frequencies to be created that are cross-products of the original signals being transmitted. Large effective area fibers can alleviate the symptoms of intermodulation.

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