Danielle Best - Task 1 by Danielle Best https://padlet.com/danielle_best/aqx0uuhmooj6 en-us 2017-04-02 21:01:06 UTC 2017-04-30 19:07:21 UTC hello@padlet.com Basic structure of and materials used danielle_best https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196098 A fiber optic cable consists of three parts; the core, the cladding, and the coating or buffer. The core is generally made of glass. The core is described as having a radius of (a) and an index of refraction n1. The core is surrounded by a layer of material called the cladding. Even though light will propagate along the fiber core without the layer of cladding material, the cladding does perform some necessary functions.The coating or buffer is a layer of material used to protect an optical fiber from physical damage. The material used for a buffer is a type of plastic.]]> 2017-04-02 21:03:43 UTC https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196098 How is info carried over long distances danielle_best https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196143 Light travels down a fiber-optic cable by bouncing repeatedly off the walls. Each tiny photon (particle of light) bounces down the pipe like a bobsleigh going down an ice run. Now you might expect a beam of light, traveling in a clear glass pipe, simply to leak out of the edges. But if light hits glass at a really shallow angle (less than 42 degrees), it reflects back in again—as though the glass were really a mirror. This phenomenon is called total internal reflection. It's one of the things that keeps light inside the pipe.
The other thing that keeps light in the pipe is the structure of the cable, which is made up of two separate parts. The main part of the cable—in the middle—is called the core and that's the bit the light travels through. Wrapped around the outside of the core is another layer of glass called the cladding. The cladding's job is to keep the light signals inside the core. It can do this because it is made of a different type of glass to the core. (More technically, the cladding has a lower refractive index.)
]]> 2017-04-02 21:04:18 UTC https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196143 The conditions of total internal reflection danielle_best https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196167 For total internal reflection to occur two conditions must be met. The index of refraction must decrease across the boundary in the direction of light refraction and the angle of incidence of the light ray must exceed the critical angle of the interface.
]]> 2017-04-02 21:04:44 UTC https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196167 How materials used and the bending of optical fibers affect the quality of the signal danielle_best https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196222 It is possible, some fraction (but not all) of the light can escape at a bend if the bend is to great. This is because if the optical fiber bends too much the light that travels within the optical fiber will strike the wall at less than the critical angle. This will cause the signal quality to decrease.
The materials affect the signal because if they aren't the right density the critical angle will be to large and the light will be more likely to escape.]]> 2017-04-02 21:05:29 UTC https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164196222 Refrences danielle_best https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164197589 http://www.tpub.com/neets/tm/106-8.htm
https://www.brainscape.com/flashcards
http://www.explainthatstuff.com/fiberoptics.html
https://www.physicsforums.com/]]> 2017-04-02 21:20:07 UTC https://padlet.com/danielle_best/aqx0uuhmooj6/wish/164197589