ean 128 generator c# Figure 28-3: Step index fiber optics in Software

Make Quick Response Code in Software Figure 28-3: Step index fiber optics

Figure 28-3: Step index fiber optics
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Graded Index Fiber Optics
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A second form of multi mode fiber was the use of a graded index of the glass, as opposed to the step index Essentially, the grading of the refraction levels of the light was changed to compensate for the amount of refraction and the density of the glass In the step index, modal dispersion (spreading out of the light) was in part responsible for a reduction of the throughput on the fiber By using a grading of the density of the glass from the center core out, the capacity of the fiber was increased Simply stated, the more dense the glass was, the more refractive the surface of the glass was; or the more refraction taking place, the longer the path By having a step index, the path of the outer part of the glass was longer than the path in the center of the glass This meant that the light arrived in different times because the length of the path was longer Grading the center core to be a higher level of refraction and the outer parts of the glass to be thinner (and less refractive), could use the characteristics of the glass to get approximately the same length of a wave on the cable and therefore increase the speed of throughput The graded index is shown in Figure 28-4 The better the grading of the index, the more throughput we can expect Currently, the two forms of graded index fiber use either a 625-micron or a 50micron center conductor with a 125 micron outer cladding on the glass
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Figure 28-4: A graded index fiber
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As fiber became more popular and research was stepped up, a newer form of glass was developed If the glass could be made so thin and so pure in the center, the light would have no choice but to follow the same path every time A single path (or single mode) between the two ends allowed the developers to speed up the input because there was no concern about varying lengths of the path as shown in Figure 28-5 Using a single mode fiber today, the thickness is approximately 83 10 microns thick at the center There is still an outer cladding on the outer edges to reflect the light back into the center of the glass The outer cladding is still approximately 125 microns The single mode fiber is where most of the activity is being generated today Many of the telephone carriers deployed a multi mode fiber in their networks when it was first introduced However, over the years the multi mode has given way to single mode fiber throughout the public carrier networks
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Figure 28-5: Single mode fiber is so pure and so thin that the light has only one path from end to end
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Benefits of Fiber Over Other Forms of Media
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The benefits of fiber over other forms of media are shown in Table 28-2 However, it is important to note that the fiber has been used extensively in the long distance telecommunications networks and the local telephone company networks It is more recently that a single mode fiber has worked its way into the end user networks (LANs and CANs) With single mode fiber, the speeds are constantly being upped, while the error performances are continually being improved This table concentrates on the bit error rates and the speed of the cabling systems Table 28-2: Fiber based advantages over other media Advantage Lower errors Description BER approximates 10 15 for fiber, whereas copper will be in the 10 4 to 10 8 range Cost per foot on fiber is now approximately $20 compared $13 for copper Immune from RFI and EMI without extra cost of shielding on copper Ease of installation due to lower weight and thickness Greater distance with less repeaters Now can achieve 30 200 miles without repeaters Copper and radio limited to less than 30 miles Fiber nearing 1 Tbps, copper 100 Mbps and coax 1 Gbps Using TDM and WDM, the fiber is both digital and frequency multiplexed increasing capacity
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