Chp 22 - Optical Fiber Characteristics Flashcards
What causes modal dispersion
Caused by light taking different paths through the optical fiber
Define dispersion
Spreading of light as it moves from its source.
How can you over come modal dispersion?
Lower bit rate, reduce core size, increase wavelength
What causes materiel dispersion?
Caused by different light waves traveling at different speeds
What causes Polarization-Mode Dispersion?
When electrical wave and magnetic wave get out of sync.
Define attenuation?
Loss of optical power expressed in decibels, typically decreases as wave length increases.
Loss that is are fault is called?
Extrinsic factors
Define Intrinsic factors
Out of our control, absorption, scattering
Scattering accounts for how much attenuation?
95-97%
How are micron bends caused?
Caused by crushing / pinching of the fiber
Macrobends are caused by?
Over bending of the fiber.
Numerical aperture is defined as?
Light gathering ability of the fiber
Light traveling through fiber populated the available modes in an orderly way is called?
Equilibrium mode distribution
