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For a given elliptical laser beam injected in a multimode fiber optic with a lens, calculates the coupling efficiency as a function of the wavelength, the incident beam waist dimensions and the M square factors along the horizontal and vertical axis, the effective focal length of the lens, the diameter and numerical aperture of the fiber optic and its entrance facet transmission. The waist of the elliptical beam in the object space is supposed to be in the front focal plane of the lens. Therefore, the waist of the transmitted beam is in the back focal plane of the lens where the fiber entrance is also located.