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Fiber Optic Cable

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Krupali Shah

on 25 January 2015

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Transcript of Fiber Optic Cable

Fiber Optic Cable
Krupali Shah and Melissa Harbans
A fiber optic cable is a network cable that contains strands of glass fiber inside an insulated casing. These cables are designed for long distances, and very high speed network communications. Fiber optic cables carry communication signals using pulses of light. When light travels between two mediums that are of different speeds, it bends (refracts), depending on the angle at which it strikes the substance. When the angle of incidence is past the critical angle, light no longer travels between the substances but reflects back into the original medium completely. The boundary now acts as a mirror, keeping the light inside. This is called Total Internal Reflection and is the basis of the fiber optic cable.
Fiber Optic Wires and relation to optics
Involvement of Total Internal Reflection
The advantages of Fiber Optic Cables are:
--> long-term: It is a life long product and the cost pays off overtime.
--> Low Power Requirement: the light signal loses less energy as it is transmitted, therefore low powered transmitters can be used instead of the high-voltage transmitters that are needed for copper wires.
--> Non-flammable: these use no electricity, so they are safer and there is no risk of electrical fire.
--> No interference: all data is transmitted almost always without an error.
The disadvantage is:
--> The cost is relatively high and therefore sometimes hard to afford.
Pros and Cons
Fiber optic cables can be used in classrooms for the computer systems. Since the information is transferred quickly and completely, this would be really a great investment. Though more costly then regular wires, it doesn't pick up interference and provides proper results.
Use in the Classroom
Fiber optic wires are very efficient because they allow the transfer of information in the form of light, which as we all know is extremely fast . Information rarely escapes the fiber optic wires due to internal reflection, and tiny pulses along the way. This means that the message is sent in pulses of light as either on or off which add up to make a whole message.
If we break up the way in which fiber cables work, we end up with 4 components:
--Transmitter - Produces and encodes the light signals
--Optical fiber - Conducts the light signals over a distance
--Optical receiver - Receives and decodes the light signals
--Optical re-generator - May be necessary to boost the light signal, ensuring no light signal is lost
Imagine the system of optical fibers as two ships trying to communicate during WW2.
Ship 1
Ship 2


Optical Receiver
This video shows exactly how internal refraction comes into play:
Cost: The cost of the optic cable varies based on the type, the price range can be anywhere from $8.99/m to $56.99/m .
Wires which are expensive, provide larger insulation and are needed for the computer and communications industry. At places with little interference such as schools, the more simple kind of wires can perform the job just as well.
In conclusion, we think that fiber optic cables are definitely something that a school should invest in as it not only uses new technology for better results but also provides fast and accurate results. Even though the cost may be a little high, it is an object that pays off its price as you use it more. All in all, we should definitely get these cables for our school's computer and communication systems.
Other Uses
Other uses of fiber optics are in the medical and mechanical industries.
Medical benefits-The properties of fiber optics have allowed medical personnel to see places in the human body with greater ease and comfort for the patients, as well as detailed visuals for the surgeons. Instruments such as Bronchoscopes and Endoscopes allow doctors to examine the inside of the respiratory tract and evaluate interior surfaces.Mechanical benefits- usage of fiber optics as part of systems to allow engineers to inspect mechanical welds in pipes and engines.
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