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There is no such thing, strictly speaking, as negative resistance. That is to say, one cannot have anything better than a perfect conductor. In some cases, a supply of direct current, such as a battery, can be treated as a negative resistance; in other cases, you can have a device that acts as if its resistance were negative under certain changing conditions. But generally, in the RX (resistance-reactance) plane, the resistance value is always positive. This means that you can remove the negative axis, along with the upper-left and lower-left quadrants, of the complex-number plane, obtaining a half plane as shown in Fig. 15-5.

Virtually all P-N junctions exhibit conductivity that varies with exposure to radiant electromagnetic energy such as IR, visible light, and UV. The reason that conventional diodes are not affected by these rays is that they are enclosed in opaque packages. Some photosensitive diodes have variable dc resistance that depends on the intensity of the electromagnetic rays. Other types of diodes produce their own dc in the presence of radiant energy.

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Scattering within the silica matrix causes the second major impairment phenomenon. Two significant nonlinearities result: Stimulated Brillouin Scattering (SBS) and Stimulated Raman Scattering (SRS). Stimulated Brillouin Scattering (SBS) SBS is a power-related phenomenon. As long as the power level of a transmitted optical signal remains below a certain threshold, usually on the order of three milliwatts, SBS is not a problem. The threshold is directly proportional to the fiber s effective area, and because DSF typically have smaller effective areas, they have lower thresholds. The threshold is also proportional to the width of the originating laser pulse; as the pulse gets wider, the threshold goes up. Thus, steps are often taken through a variety of techniques to artificially broaden the laser pulse. This can raise the threshold significantly, to as high as 40 milliwatts.

Now you should get a better idea of why capacitive reactance, XC, is considered negative. In a sense, it is an extension of inductive reactance, XL , into the realm of negatives, in a

Silicon Photodiodes A silicon diode, housed in a transparent case and constructed in such a way that visible light can strike the barrier between the P-type and N-type materials, forms a silicon photodiode. A reverse-bias voltage is applied to the device. When radiant energy strikes the junction, current flows. The current is proportional to the intensity of the radiant energy, within certain limits. Silicon photodiodes are more sensitive at some wavelengths than at others. The greatest sensitivity is in the near infrared part of the spectrum, at wavelengths just a little bit longer than the wavelength of visible red light. When radiant energy of variable intensity strikes the P-N junction of a reverse-biased silicon photodiode, the output current follows the light-intensity variations. This makes silicon photodiodes useful for receiving modulated-light signals of the kind used in fiber-optic communications systems. The Optoisolator An LED or IRED and a photodiode can be combined in a single package to get a component called an optoisolator. This device, the schematic symbol for which is shown in Fig. 20-10, creates a modulated-light signal and sends it over a small, clear gap to a receptor. An LED or IRED converts an electrical signal to visible light or IR; a photodiode changes the visible light or infrared back into an electrical signal. When a signal is electrically coupled from one circuit to another, the two stages interact. The input impedance of a given stage, such as an amplifier, can affect the behavior of the circuits that feed power to it. This can lead to various sorts of trouble. Optoisolators overcome this effect, because the coupling is not done electrically. If the input impedance of the second circuit changes, the impedance that the first circuit sees is not affected, because it is simply the impedance of the LED

way that cannot generally occur with resistance. Capacitors act like negative inductors. Interesting things happen when capacitors and inductors are combined, which is discussed in the next couple of chapters. Reactance can vary from extremely large negative values, through zero, to extremely large positive values. Engineers and physicists always consider reactance to be imaginary. In the mathematical model of impedance, capacitances and inductances manifest themselves perpendicularly to resistance. The general symbol for reactance is X; this encompasses both inductive reactance (XL) and capacitive reactance (XC).

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