Optical module
First Claim
1. 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.
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Accused Products
Abstract
An optical module for optically coupling an input side and an output side with each other through an optically functional portion inserted between the input side and the output side. At least one of the input side and the output side includes a plurality of collimators. At least one of the collimators is made different from the other collimators in at least one of the distance between the focal point of a corresponding lens and a corresponding light exit or incident surface, the numerical aperture of the light exit or incident surface, the effective focal length of the lens, the wavelength used and the distance between optical axes of adjacent ones of the collimators so that the size and position of a beam waist on an input side are made substantially coincident with those on an output side. In the case of a fiber collimator 14 constituted by a combination of a lens 12 and an optical fiber 10, an end surface of the optical fiber serves as a light exit or incident surface and the mode field diameter of the optical fiber also serves as one of variable characteristic parameters.
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Citations
14 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14)
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12. A wedge-shaped rod lens array comprising:
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a plurality of gradient index rod lenses arrayed in at least one row, and each extending in parallel to an optical axis direction;
a frame supporting the gradient index rod lenses, and having a first end surface perpendicular to the optical axial direction, and a second end surface inclined with respect to the optical axial direction, wherein an end surface of each said gradient index rod lens is flush with said second end surface of said frame.
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Specification