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Modes: An Analogy
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The concept of modes is sometimes difficult to understand, so let me pass along an analogy that will help. Imagine a shopping mall that has a wide, open central area that all the shops open onto. An announcement comes over the PA system informing people that the mall is now closed;
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please make your way to the exit. Shoppers begin to make their way to the doors, but some wander from store to store, window-shopping along the way, whereas others take a relatively straight route to the exit. The result is that some shoppers take longer than others to exit the mall because there are different modes. Now consider a mall that has a single, very narrow corridor that is only as wide as a person s shoulders. Now when the announcement comes, everyone heads for the exit, but they must form a single-file line and head out in an orderly fashion. If you understand the difference between these two examples, you understand single- versus multimode fiber. The first example represents multimode; the second represents single mode.
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The first of these is multimode fiber, which arrived in a variety of different forms. Multimode fiber bears that name because it enables more than a single mode or ray of light to be carried through the fiber simultaneously because of the relatively wide core diameter that characterizes the fiber. Although the dispersion that potentially results from this phenomenon can be a problem, multimode fiber has its advantages. For one thing, it is far easier to couple the relatively wide and forgiving end of a multimode fiber to a light source than that of the much narrower single-mode fiber. It is also significantly less expensive to manufacture (and purchase) and relies on LEDs and inexpensive receivers rather than the more expensive laser diodes and ultra-sensitive receiver devices. However, advancements in technology have caused the use of multimode fiber to fall out of favor; single-mode is far more commonly used today. Multimode fiber is manufactured in two forms: step-index fiber and graded-index fiber. We will examine each in turn. Multimode Step-Index Fiber In step-index fiber, the index of refraction of the core is slightly higher than the index of refraction of the cladding. Remember that the higher the refractive index, the slower the signal travels through the medium. Thus, in step-index fiber, any light that escapes into the cladding because it enters the core at too oblique an angle will actually travel slightly faster in the cladding (assuming it does not escape altogether) than it would if it traveled in the core. Of course, any rays that are reflected repeatedly as they traverse the core
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also take longer to reach the receiver, resulting in a dispersed signal that causes problems for the receiver at the other end. Clearly, this phenomenon is undesirable; for that reason, graded-index fiber was developed. Multimode Graded-Index Fiber Because of the dispersion that is inherent in the use of step-index fiber, optical engineers created graded index fiber as a way to overcome the signal degradation that occurred. In graded-index fiber, the refractive index of the core actually decreases from the center of the fiber outward. In other words, the refractive index at the center of the core is higher than the refractive index at the edge of the core. The result of this rather clever design is that as light enters the core at multiple angles and travels from the center of the core outward, it is actually accelerated at the edge and slowed down near the center, causing most of the light to arrive at roughly the same time. Thus, graded-index fiber helps to overcome the dispersion problems associated with step-index multimode fiber. Light that enters this type of fiber does not travel in a straight line, but rather follows a parabolic path, with all rays arriving at the receiver at more or less the same time. Graded-index fiber typically has a core diameter of 50 to 62.5 microns, with a cladding diameter of 125 microns. Some variations exist; at least one form of multimode graded-index has a core diameter of 85 microns, somewhat larger than those described. Furthermore, the actual thickness of the cladding is important. If it is thinner than 20 microns, light begins to seep out, causing additional problems for signal propagation. Graded-index fiber was commonly used in telecommunications applications until the late 1980s. Even though graded-index fiber is significantly better than step-index fiber, it is still multimode fiber and does not eliminate the problems inherent in being multimode. Thus was born the next generation of optical fiber: single-mode.
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