| Q1: |
how do optic fibres work |
nathan |
30/6/2010 |
| Ans: |
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| Q2: |
what are the losses of laser optical fibre? |
vasu yadav |
27/12/2008 |
| Ans: |
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| Q3: |
how does laser optical fibre carry in formation? |
vasu yadav |
27/12/2008 |
| Ans: |
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| Q4: |
what is laser optical fibre? |
vasu yadav |
27/12/2008 |
| Ans: |
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| Q5: |
what is the principle of laser optical fibre? |
vasu yadav |
27/12/2008 |
| Ans: |
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| Q6: |
how does laser optical fibre work? |
vasu yadav |
27/12/2008 |
| Ans: |
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| Q7: |
how does optical fibres carry information? |
harley |
21/10/2008 |
| Ans: |
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| Q8: |
what are the uses of optical fibres? |
tOyA_o8 |
1/9/2008 |
| Ans: |
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| Q9: |
what is an optical fibre? |
casper |
28/7/2008 |
| Ans: |
Optical fiber (or fibre) is a glass or plastic fiber that carries light along its length. Optical fiber carries much more information than conventional copper wire and is in general not subject to electromagnetic interference and the need to retransmit signals. Most telephone company long-distance lines are now of optical fiber. |
| Q10: |
how is optical fibre useful in communication technology? |
casper |
28/7/2008 |
| Ans: |
Fiber optic cables have a much greater bandwidth so they can carry more data. Fiber optic cables are less susceptible than metal cables to interference. Fiber optic cables are much thinner and lighter than metal wires. Data can be transmitted digitally (the natural form for computer data) rather than analogically. The information can be transmitted over longer distance as light undergoes lesser attenuation as compared to electrical cables. Wiretapping is more difficult as compared to electrical cable, |
| Q11: |
thx so much for this website... i LUV all ur animations they're reli helpful and all the questions helped me heaps... i luv this site and again thank you |
casper |
28/7/2008 |
| Ans: |
Thanks |
| Q12: |
Exactly how does 'Total Internal Reflection' work in firber optics? |
Andrew |
14/5/2008 |
| Ans: |
Optical fibers are based entirely on this principle of total internal reflection. An optical fiber is a flexible strand of glass. The light enters the glass cable, the light will hit the wall at an angle higher than the critical angle and will all be reflected back into the fiber. Light passes through a material with a high index of refraction, typically glass or plastic. This material is surrounded by material with a lower index of refraction. If the light strikes the sides at a large enough angle, it totally reflects and stays inside. |
| Q13: |
explain intramodel dispersion with example? |
jaspal |
25/3/2008 |
| Ans: |
Intramodal, or chromatic dispersion occurs in all types of fibers. Due to the fact that different wavelengths travel at different speeds, even within the same mode. It is of two types material and waveguide. Material dispersion occurs because the spreading of a light pulse is dependent on the wavelengths' interaction with the refractive index of the fiber core. Different wavelengths travel at different speeds in the fiber material and exit the fiber at different times. It is a function of the source spectral width. It is less at longer wavelengths. Waveguide dispersion occurs because the mode propagation constant is a function of the size of the fiber's core relative to the wavelength of operation, it also occurs because light propagates differently in the core than in the cladding. |
| Q14: |
explain losses of fibre optics? |
jaspal |
14/3/2008 |
| Ans: |
Losses are through connectors (0.75 db) , splices ( 0.75 dB) and attenuation per kilometer (0.35 dB). End gaps cause two problems, insertion loss and return loss. The emerging cone of light from the connector will spill over the core of the receiving fiber and be lost. In addition, the air gap between the fibers causes a reflection when the light encounters the change n refractive index from the glass fiber to the air in the gap. This reflection (called fresnel reflection) amounts to about 5% in typical flat polished connectors, and means that no connector with an air gap can have less than 0.3 dB loss. |
| Q15: |
what is meant by cladding |
Haresh |
1/4/2007 |
| Ans: |
Light passes through the glass or plastic core fiber using total internal reflection, the fiber core is surrounded by a thick cladding layer of lower refractive index than the core and whose main purpose is to restrict the signal to the core either at its boundary with core or in a grdual manner as in graded –index optical fibers. |
| Q16: |
What is the atomic model of an optical fiber? |
Sarah |
30/3/2007 |
| Ans: |
It is the quantum model but one where stimulation takes precedence over spontaneous emission of photon by excited electrons. Stimulation means that an incoming radiation can stimulate a laser electron to emit a photon in the same direction leading to amplification of the incoming wave. |
| Q17: |
how does total internal reflection apply in endoscopes? |
SONU |
23/3/2007 |
| Ans: |
Endoscopes use a fiber optic cable to transmit light and images through curved structures. This is based on the phenomenon of total internal reflection, light undergoes multiple reflections inside the cable but does not escape through the body of fiber optic cable , this makes it extremely useful for data transfer and imaging. |
| Q18: |
how optical fibre helps in diagonosis |
younus |
23/3/2006 |
| Ans: |
Fiber-optic probe is used for non-contact diagnosis of interior parts of eyes. For illuminating remote regions of the body, and carry understandable images back out to the doctor. They are used for Metabolic imaging of tissues by infrared fiber-optic spectroscopy, they direct radiation onto tissue, collect those radiation subsequently emitted by the tissue and deliver them for spectral analysis. They also detect substances like disease-indicating proteins in blood, useful in diagnosis. |
| Q19: |
explain how i develop flash animations on dwdm |
rajesh |
10/3/2006 |
| Ans: |
Welcome back Rajesh, could you be more specific as to where you are facing a problem in animating it, we had tried to address this issue some time back ( pls. refer answers below). If could be more clear than we will be more useful to you. |
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