초록 ▼

A device in a fiber optic system for variably attenuating the signal between optical fibers consisting of two fixedly mounted optical fibers and a moveably mounted reflective surface disposed therebetween. Light emitted from the face of the first fiber strikes the reflective surface and is redirecte

A device in a fiber optic system for variably attenuating the signal between optical fibers consisting of two fixedly mounted optical fibers and a moveably mounted reflective surface disposed therebetween. Light emitted from the face of the first fiber strikes the reflective surface and is redirected toward the collecting face of the second fiber. That amount of redirected light which will fall incident upon the face of the second fiber, within a predetermined angle to the optical axis of the second fiber will be transmitted through the fiber and be measured by a light detector. By moving the reflective surface calibrated amounts with respect to the faces of the fixed fibers, the amount of light incident on the face of the second fiber, and thereby transmitted, can be varied, measured and controlled.

대표청구항 ▼

A variable optical attenuator comprising: first and second optical fibers having respective longitudinal axes disposed at an angle and a pair of respective ends positioned adjacent and spaced from one another, said first fiber having an output face at one said end for emitting light, said second fib

A variable optical attenuator comprising: first and second optical fibers having respective longitudinal axes disposed at an angle and a pair of respective ends positioned adjacent and spaced from one another, said first fiber having an output face at one said end for emitting light, said second fiber having an input face at said adjacent end for collecting light; light beam director means having a uniformly reflective surface positioned proximate to and spaced from said ends for reflecting light emitted from said output face to said input face and having a longitudinal axis extending in a direction between said axes of said fibers; and adjustable holding means for supporting and mechanically adjusting movement of said light beam director to and fro along the longitudinal axis thereof to a continuously selectable position in a path between said end faces to determine the spacing of said reflective surface from said ends and the amount of light incident upon said input face, said adjustable holding means having a longitudinal axis coinciding with said light beam director axis, the entire length of said adjustable holding means being freely moveable therealong.