Fiber optics exam 1
Total internal reflection - Answer-Trapping light in a material (fiber optic) by surrounding it by another
material with a lower refractive index is the phenomenon of
Index of Refraction - Answer-Ration of Speed of light in a material/Speed of light in a vacuum
Measure to how much light slows down when entering a material
Attenuation - Answer-The reduction in optical power (Loss) as it passes along a fiber, usually expressed
in dB
Optical fiber data link is made of 3 elements - Answer-1) Light source
2)Fiber
3) Light Detector
Typical fiber optic data link - Answer-1) Transmitter = source driver and light
2) Connectors
3) Cables/Fiber
4)photodiode receiver
Buffer Coating - Answer-Physical protection around the Cladding/core
Cladding - Answer-Covering around glass that keeps light inside of Core via Total Internal Refraction
Core - Answer-Center glass where light travels
, Multi mode Step index - Answer-1 type of glass
Light travels in straight lines
Multi mode graded index - Answer-Many layers of glass in the core
100x faster then Step-Index
Single Mode - Answer-Light travels in one mode
NO modal dispersion
Bandwidth increases
CATV - Answer-Community Antenna Television
62.5/125 - Answer-Diameter of core/Diameter of Cladding
Numerical Aperture - Answer-Highest angle that light can enter a fiber
Calculated by (difference in the indices of refraction of the core and cladding) via Snells law
Mode - Answer-Direction of light
Single mode - 1 light direction
Multi-mode. - multiple angles of light
Chromatic Dispersion - Answer-Occurs with LED's
Change of light by the prism effect that disperses light into its color wave lengths which changes the
speed of light in a fiber
Advantages of Fiber Optics - Answer-Transport more Info
Total internal reflection - Answer-Trapping light in a material (fiber optic) by surrounding it by another
material with a lower refractive index is the phenomenon of
Index of Refraction - Answer-Ration of Speed of light in a material/Speed of light in a vacuum
Measure to how much light slows down when entering a material
Attenuation - Answer-The reduction in optical power (Loss) as it passes along a fiber, usually expressed
in dB
Optical fiber data link is made of 3 elements - Answer-1) Light source
2)Fiber
3) Light Detector
Typical fiber optic data link - Answer-1) Transmitter = source driver and light
2) Connectors
3) Cables/Fiber
4)photodiode receiver
Buffer Coating - Answer-Physical protection around the Cladding/core
Cladding - Answer-Covering around glass that keeps light inside of Core via Total Internal Refraction
Core - Answer-Center glass where light travels
, Multi mode Step index - Answer-1 type of glass
Light travels in straight lines
Multi mode graded index - Answer-Many layers of glass in the core
100x faster then Step-Index
Single Mode - Answer-Light travels in one mode
NO modal dispersion
Bandwidth increases
CATV - Answer-Community Antenna Television
62.5/125 - Answer-Diameter of core/Diameter of Cladding
Numerical Aperture - Answer-Highest angle that light can enter a fiber
Calculated by (difference in the indices of refraction of the core and cladding) via Snells law
Mode - Answer-Direction of light
Single mode - 1 light direction
Multi-mode. - multiple angles of light
Chromatic Dispersion - Answer-Occurs with LED's
Change of light by the prism effect that disperses light into its color wave lengths which changes the
speed of light in a fiber
Advantages of Fiber Optics - Answer-Transport more Info
