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12 Cards in this Set
- Front
- Back
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Bit-Rate Length Product |
Bitrate (bits/s) * Channel Length (km) = Bit-Rate Length Product |
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Dispersion |
Separation of light into its constitute colors (wavelengths) |
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Pulse bandwidth |
○Defined at Full Width Half Maximum ○Delta_{lambda} |
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Travel Time per Unit Length |
○The time difference, in seconds, for the travel time between the shortest and longest wavelength in the pulse, calculated over 1 km of fiber. ○delta_{tau/L} = (tau/L)_2 - (tau/L)_1
○Can express using the second derivative of the refractive index. ○delta_{tau/L}= -(lambda/c) * n'' * delta_{lambda} |
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Group Velocity |
○Related to the first derivative of the refractive index ○Carries the information of an information packet. ○dn/d_{lambda} ○Can never exceed the speed of light. |
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Material Dispersion |
○Has units of ps/(nm * km) ○M = (lambda/c)*n'' ○The group velocity's dispersion is related to the derivative of the phase velocity's dispersion. |
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Maximum Information Rate |
○Want to minimize maximum pulse spread to less than 180° so we always have some kind of signal to measure. ○Maximum allowable pulse spread: delta_{tau} < T/2 ○Upper limit on sinusoidal frequency: f_{3dB}=1/T = 1/(2*delta_{tau}) |
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Phase Velocity |
○The speed at which a wavefront is displaced. ○Vp=omega/k=c/n ○Does not represent the transfer of information, mass, or energy. ○Can exceed the speed of light. |
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Interference Period |
○lambda/(2*n1*cos(theta)) ○Generated by off - axis plane waves propagating down the waveguide |
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Material Dispersion |
Phase shift versus wavelength caused by the glass's different index of refraction as a function of wavelength (lambda) |
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Waveguide Dispersion |
Phase shift versus wavelength induced by the effective index of refraction. Influences the phase velocity. |
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Modal Distortion |
Phase shift that is independent of wavelength. Depends on the waveguide's geometry and relates longer travel times to higher modes. Influences the group velocity. |
