„student’s seminary“ presentation optical fibersdorian/cech_optical_fibers.pdf · optical...
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OPTICAL FIBERS
„Student’s seminary“ presentation
Jan Čech 4.5.2011
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REFERENCES:
Description based on the Wikipedia article: http://en.wikipedia.org/wiki/Optical_fiber
Pictures taken from Wikimedia (unless stated
otherwise) http://commons.wikimedia.org/wiki/Category:Optical_fibers
For further readings: (in Czech):
MARŠÁLEK, Leoš. Optická vlákna : verze 2.1.3 . Technická univerzita Ostrava (available
online)
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OPTICAL FIBRE - DEFINITION
• Optical fibre is waveguide in the optical signals frequency domains.
• Optical fibre works on the principle of Total Reflection (internal)
• Optical fibre is usually thin rod of transparent material (glasses, plastics) – core – surrounded by cladding material with lower refraction index + mechanical sheath.
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OPTICAL FIBRE – EARLY BEGINNINGS
Popular Science Monthly Volume 11
1877
The very basic light guide :o)
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OPTICAL FIBRE – TOTAL REFLECTION
Total reflection of laser
in multimode fibre.
Timwether: http://commons.wikimedia.org/wiki/File:Laser_in_fibre.jpg
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OPTICAL FIBRE – CONSTRUCTION
Core
Cladding
Shielding
Ryj: http://commons.wikimedia.org/wiki/File:Quarzfaser.jpg
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OPTICAL FIBRE – CONSTRUCTION II
Mrzeon: http://en.wikipedia.org/wiki/File:Optical_fiber_types.svg
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OPTICAL FIBRE – NUMERICAL APERTURE
User A1 at en.wikipedia: http://en.wikipedia.org/wiki/File:Optic_fibre-
numerical_aperture_diagram.svg
Acceptance cone, depends on refractive index of core vs. cladding.
NAsin 2
2
2
1max nnΘn
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OPTICAL FIBRE – ATTENUATION
Characteristic spectral response of quartz optical fibre optics light guides taken
from Edmund Optics online catalogue:
http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=1858
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OPTICAL FIBRE – UNCOMMON USAGE
Sakurambo: http://en.wikipedia.org/wiki/File:Fiber_Bragg_Grating-en.svg
Fibre Bragg Grating
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Thank You for Your attention! :o)