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Polarization mode dispersion (PMD) is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses.
With accommodation relaxed: Simple astigmatism Simple hyperopic astigmatism – first focal line is on the retina, while the second is located behind the retina.; Simple myopic astigmatism – first focal line is in front of the retina, while the second is on the retina.
In fiber-optic communication, a single-mode optical fiber (SMF), also known as fundamental- or mono-mode, [1] is an optical fiber designed to carry only a single mode of light - the transverse mode.