Patent ID: 6501884
Filing Date: 2002-12-31
Classification: G02B

Abstract:
A method of launching a light beam from a semiconductor light source into a multimode optical fiber, the multimode fiber having an axis and an input face, the semiconductor light source having an axis and an output face, the light beam being, at least between said output face and said input face, an unguided light beam; wherein the method comprises directing said unguided light beam onto said input face of the multimode fiber nominally at the center of the input face, the unguided light beam being directed such that the light beam at incidence on said input face forms an angle &thgr;b with a direction perpendicular to said input face, with &thgr;b selected such that at least one lower order mode of a guided radiation being substantially not excited in the multimode fiber, with at least some higher order modes being substantially excited.