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Before proceeding too far from the beginning of dense wave division multiplexing, it may be appropriate to look at the fiber optic world and its relationship to the demand of the industry Moreover, the types of fiber in use determine the capacity being delivered today, so a quick review of the variations of fiber may help to define the overall benefits of the multiplexing schemes on the glass Fiber has been used in North America since the 1960s The carriers recognized the limitation of the copper cable they had been installing for years First, the copper was very expensive Moreover, it was also highly susceptible to noise and interference (both Radio Frequency Interference [RFI] and Electromagnetic Interference [EMI]) The carriers tried to get more capacity on the wires to make the cable plant more efficient and cost-effective However, modulation techniques left the carriers wanting more Most of the cabling systems were installed by using some form of analog transmission system In the late 1950s and into the 1960s, the Bell System developed a digital modulation technique, which could take advantage of the limited bandwidth and capacities of the copper cables Radio-based systems were also in heavy use on the carriers networks The limited frequencies, radio interference, and line-of-sight demands of radio all led to frustration As a result, the use of fiber optics became very attractive to the carriers Fiber is made up of glass, which is an inert material that is unaffected by electromagnetic and radio frequency interference The thickness of the glass is used to determine the throughput and the light capacities in a carrier-based network Two primary types of fiber were developed over the years to support the communications demands of the network These two types are multi mode fiber and single mode fiber Multi mode fiber is thicker and therefore limited in its bandwidth Single mode is thinner and purer so it has greater capacities.

builders use high-pressure air or nitrogen, which do not have to change state from liquid to gas This gets around the problem of the tanks freezing up, but it doesn t store nearly as much energy in the same space and requires huge tanks to run a hammer for an entire match Another option is to drive the hammer with an electric motor This makes it easy to give the weapon 180 degrees or more of travel, allowing it to reach full speed before hitting the target Gearing should be optimized for maximum speed at impact, taking into account that with too low a gear ratio, the motor won t have enough torque to get up to speed, while too high a ratio will mean that your hammer will reach its top speed too early and not do as much damage as it should Problems of both speed and torque can be solved by choosing the most powerful drive motor you can for the mechanism Some hammer robots have used a crankshaft mechanism to produce reciprocating hammer motion from a continuously turning drive motor When considering this kind of mechanism, you should keep in mind two things: First, you want the hammer moving at maximum speed when it strikes the opponent; many simple crankshaft mechanisms will have the hammer traveling at top speed only in the middle of the stroke Second, if the hammer s motion is interrupted mid-stroke, it should have some way of reversing and striking again without stalling or having to lift the entire robot off the ground Hydraulic-powered hammers have also been built Hydraulics can provide tremendous force that can accelerate a hammer very quickly, but most hydraulic systems respond rather slowly and are not ideal for the high speeds required for rapid-fire striking a good hammer system needs Building a hammer mechanism.

When fiber was first being used in the communications area, the technology was still developing Multi mode fiber was used as a means of carrying communications signals on the glass more reliably Multi mode, as the name implies, has multiple paths where the light can reach the end of the fiber Single mode fiber, on the other hand, has only one path that the light can travel to get to the other end Using a large piece (chunk) of pure glass, the developers extruded the fiber into much thinner glass strands The multi mode fiber is the thicker glass by today s standards The multi mode was developed in two different types, step index and graded index, both operating differently Figure 28-3 is a representation of the multi mode fiber, using a step index mode In this case, the glass is very thick at the center core (approximately 120 400 microns) The thickness of the glass is crucial to the passage of the light and the path used to get from one end to another The step index is the thickest form of fiber; using the core of 120 400 microns thick, the light is both refracted and reflected inside the encased fiber Because of the density of the glass, the center core refracts the light in different angles At the same time, there is an outer cladding on the glass used to reflect the light into the center of the glass This combination of refraction and reflection of the light, along with the density of the glass causes the light to take different paths (or bounces) to the end of the cable Different light beams inserted into the fiber will take different lengths of path and therefore different timing periods to get to the end of the cable

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