Patent ID: 6292616
Filing Date: 2001-09-18
Classification: G02B

Abstract:
An optical attenuator module comprising:a first optical branching unit for branching part of incident light and passing the rest;an optical attenuator composed of a transparent glass substrate having a specified taper so that an incident plane and exit plane may not be parallel to each other, and a metal film formed on one side thereof for attenuating the light passing through said first optical branching unit by a specified attenuation factor, and being disposed in a position where said incident light through said first branching unit is passing through;a second optical branching unit for branching part of the light passing through said optical attenuator, and passing the rest;a first photo detector detecting an intensity of one of the branched light by said first branching unit;a second photo detector detecting an intensity of one of the branched light by said second branching unit;a level detector for detecting the reception levels of said first and second photo detectors; anda display unit for displaying the reception levels detected by said level detector.