Patent ID: 6590642
Filing Date: 2003-07-08
Classification: G01M

Abstract:
An inspection apparatus for inspecting an optical fiber having two optical connectors at both ends thereof, comprising:an optical branch coupler having four input/output terminal, the optical branch coupler branching and outputting light to third and fourth terminals when the first or second terminal is taken as an input terminal, the optical branch coupler branching and outputting light to the first and second terminals when the third or fourth terminal is taken as an input terminal; a light source connected to the first terminal of the optical branch coupler; a first optical sensor connected to the second terminal of the optical branch coupler; a second optical sensor connected to the fourth terminal of the optical branch coupler; a master optical connector connected to the third terminal of the optical branch coupler; and a measurement unit connected to the first and second optical sensors, wherein Fresnel reflection occurs in a state where the master optical connector is released, power of the Fresnel reflection received by the first optical sensor is defined as a first reference; the measurement unit measures an insertion loss based on the first reference and power of light received by the first optical sensor when one of two optical connectors of the optical fiber is connected to the master optical connector and the other thereof is released; and when one of two optical connectors of the optical fiber is connected to the master optical connector and the other thereof is terminated, the measurement unit measures a total return loss based on power of light received by the first optical sensor and power of light emitted from the light source and received by the second optical sensor.