Lec-5 Fiber Optic(24- Feb-2011)

Lec-5 Fiber Optic(24- Feb-2011) - Optical Fiber Technology...

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Photonic Network By Dr. M H Zaidi Optical Fiber Technology
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Photonic Network By Dr. M H Zaidi Numerical Aperture (NA) What is numerical aperture (NA)? Numerical aperture is the measure of the light gathering ability of optical fiber The higher the NA, the larger the core of light acceptance of the fiber and the easier it is to couple the light signal into the fiber At the same time, the higher the numerical aperture, the lower the bandwidth The two specifications must be balanced for optimum performance
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Photonic Network By Dr. M H Zaidi Specifying numerical aperture 62.5/125 –– 0.275 +- 0.015 Numerical Aperture
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Photonic Network By Dr. M H Zaidi Index of Refraction C= 3 10 8 meters per second, but it is reduced when it passes through matter. The index of refraction n : c n speed of light in a vacuum, 3 10 8 m/s speed of light in the given material f 1 0 0 n n c f 0 0 wavelength of light in a vacuum wavelength of light in the given material c 0 0
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