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Reference Guide to Fiber Optic Testing by J. Laferriere, G. Lietaert, R. Taws, S. Wolszczak

By J. Laferriere, G. Lietaert, R. Taws, S. Wolszczak

IN ENGLISH, good illustrated, 137 pages

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The coefficient of dispersion (D) expressed in ps/nm. This corresponds to the drift in delay as a function of wavelength (or to the slope of the curve representing delay as a function of distance at a given wavelength). It is expressed in ps/(nm . km) if it is standardized to one kilometer. 3. The slope (S) expressed in ps/(nm2 . km). This corresponds to the drift in the coefficient of dispersion as a function of wavelength (or to the slope of the curve representing dispersion as a function of distance at a given wavelength).

As shown in the figure below, InGas photodiodes are more adapted to the 1625 nm wavelength than Germanium (Ge) photodiodes since Ge photodiodes are quite sensitive and drop off rapidly at the 1600 nm window. 8 Responsivity of the three typical detector types Features found on more sophisticated power meters may include temperature stabilization, the ability to calibrate to different wavelengths, the ability to display the power relative to “reference” input, the ability to introduce attenuation, and a high power option.

XPM effects only arise, though, when multiple channels are transmitted on the same fiber. In XPM, the same frequency shifts at the edges of the signal in the modulated channel occur as in SPM, spectrally broadening the signal pulse. 2 Scattering Phenomena Scattering phenomena can be categorized according to the processes that occur when the laser signal is scattered by fiber molecular vibrations (optical photons) or by induced virtual grating. Stimulated Raman Scattering Stimulated Raman scattering (SRS) is an effect that transfers power from a signal at a shorter wavelength to a signal at a longer wavelength.

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