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Dispersion Compensation using Chirped Mirrors

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Dispersion Compensation using Chirped Mirrors

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Dispersive media are characterized by a frequency-or wavelength-dependent index of refraction. An optical pulse propagating through such media will have a carrier frequency moving forward at the phase velocity and a pulse envelope moving forward at the group velocity. Because the velocity of the different frequency components that constitute the pulse envelope is also frequency-dependent, the pulse envelope will change in shape. Dispersive effects occur for pulses of any shape, however, the analysis of pulse propagation through optical materials becomes particularly simple assuming that the pulse has a Gaussian shape. Optical pulses generated by mode-locked lasers are very close to being Gaussian which makes them mathematically tractable, therefore, all the equations presented below are based on this shape.

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