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In the diode as shown in Figure 19-3, electrons can move easily in the direction opposite the arrow, and holes can move easily in the direction in which the arrow points. But current cannot, under most conditions, flow the other way. Electrons normally do not move with the arrow, and holes normally do not move against the arrow. If you connect a battery and a resistor in series with the diode, you ll get a current to flow if the negative terminal of the battery is connected to the cathode and the positive terminal is connected to the anode, as shown in Fig. 19-4A. No current will flow if the battery is reversed, as shown in Fig. 19-4B. (The resistor is included in the circuit to prevent destruction of the diode by excessive current.) It takes a specific, well-defined minimum applied voltage for conduction to occur through a semiconductor diode. This is called the forward breakover voltage. Depending on the type of material, the forward breakover voltage varies from about 0.3 V to 1 V. If the voltage across the junction is not at least as great as the forward breakover voltage, the diode will not conduct, even when it is connected as shown in Fig. 19-4A. This effect, known as the forward breakover effect or the P-N junction threshold effect, can be of use in circuits designed to limit the positive and/or negative peak voltages that signals can attain. The effect can also be used in a device called a threshold detector, in which a signal must be stronger than a certain amplitude in order to pass through.

Look again at the diagram of Fig. 2-4. There is a certain voltage across the resistor, not specifically given in the diagram. There s also a current flowing through the resistance, not quantified in the diagram, either. Suppose we call the voltage E and the current I, in volts and amperes, respectively. Then the power in watts dissipated by the resistance, call it P, is the product E I. That is: P EI. This power might all be heat. Or it might exist in several forms, such as heat, light and infrared. This would be the state of affairs if the resistor were an incandescent light bulb, for example. If it were a motor, some of the power would exist in the form of mechanical work. If the voltage across the resistance is caused by two flashlight cells in series, giving 3 V, and if the current through the resistance (a light bulb, perhaps) is 0.1 A, then E 3 and I 0.1, and we can calculate the power P, in watts, as: (watts) EI 3 0.1 0.3 W

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As mentioned earlier, dispersion is the optical term for the spreading of the transmitted light pulse as it transits the fiber. It is a bandwidthlimiting phenomenon and comes in two forms: multimode dispersion and chromatic dispersion. Chromatic dispersion is further subdivided into material dispersion and waveguide dispersion. Multimode Dispersion To understand multimode dispersion, it is first important to understand the concept of a mode. Figure 6-18 shows a fiber with a relatively wide core. Because of the width of the core, it enables light rays arriving from the source at a variety of angles (three in this case) to enter the fiber and be transmitted to the receiver. Because of the different paths that each ray, or mode, will take, they will arrive at the receiver at different times, resulting in a dispersed signal. Now consider the system shown in Figure 6-19. The core is much narrower and only enables a single ray, or mode, to be sent down the fiber.

Suppose the voltage is 117 V, and the current is 855 mA. To calculate the power, we must convert the current into amperes; 855 mA 855/1000 0.855 A. Then P (watts) 117 0.855 100 W

battery, a resistor, a current meter, and a diode. At A, forward bias results in a flow of current. At B, reverse bias results in no current.

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Energy and the watt hour 31 You will often hear about milliwatts (mW), microwatts ( W), kilowatts (kW) and megawatts (MW). You should, by now, be able to tell from the prefixes what these units represent. But in case you haven t gotten the idea yet, you can refer to Table 2- 2. This table gives the most commonly used prefix multipliers in electricity and electronics, and the fractions that they represent. Thus, 1 mW 0.001 W; 1 W 0.001 mW 0.000001 W; 1 kW 1,000 W; and 1 MW 1,000 kW 1,000, 000 W.

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