Patent ID: 6771426
Filing Date: 2004-08-03
Classification: G02B

Abstract:
An input-output optical system of spatially optical coupled type comprising:a substrate; an input optical system which is provided on the substrate and which has an input fiber block and an input lens array block, wherein a plurality of input optical fibers are connected to the input fiber block in an array, and a plurality of collimating lenses which collimate light input from the optical fibers connected to the input fiber block and output collimated light are arranged in the input lens array block in an array; an output optical system which is provided on the substrate and which has an output lens array block and an output fiber block, wherein a plurality of collimating lenses which collimate respective light rays output from the input lens array block are arranged in the output lens array block in an array, and the output fiber block to which a plurality of output optical fibers are connected in an array and which output the light output from the output lens array block to the output optical fibers; and a spacer which is interposed between the lens array block and the fiber block in at least one of the input and output optical systems without blocking an optical path for ensuring a distance corresponding to a focal distance of the collimating lenses and a distance of the optical path.