Patent ID: 6768838
Filing Date: 2004-07-27
Classification: G02B

Abstract:
An optical module comprising a light input side, a light output side disposed to be separated by a free space from said input side, and an optically functional portion inserted between said input side and said output side so that said input side and said output side are optically coupled to each other through said optically functional portion, wherein:at least one of said input side and said output side includes a plurality of collimators; and at least one of said collimators is made different from the other collimators in at least one variable characteristic parameter selected from parameters such as a distance between a focal point of a lens and a light exit or incident surface, a numerical aperture of the light exit or incident surface, an effective focal length of the lens, a wavelength used and a distance between optical axes of adjacent ones of said collimators so that size and position of a beam waist on said input side are made approximately coincident with those on said output side.