Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1996-02-27
1997-04-29
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2159
Patent
active
056254504
ABSTRACT:
An apparatus for determining connection loss and reflection attenuation of an optical fiber cord is simple to use and avoids cumbersome and slow two-stage determination using a total reflection cord. The present apparatus has a total reflection device within the measuring apparatus. To determine a contact loss, first end connector of the test cord is inserted in the apparatus, and the output power from the opposite second end connector is measured to give contact loss data. Prior to reflection attenuation determination, the second end is inserted in the total reflection device to measure the reference output power. In this configuration, the light propagated through the test cord is totally reflected back through the test cord at the total reflection device to be measured by a photo-detector, disposed within the apparatus, to give reference light data. To determine reflection attenuation, the opposite end of the test cord is now removed from the apparatus and its surface is coated with a refraction adjusting coating to reduce the reflection from the opposite end to nearly zero. The light propagating through the test cord is all reflected back at the surface of the first end connector to be measured by the photo-detector, and produces reflected light data. The reflection attenuation is calculated from the reference light data and the reflected light data. The apparatus thus provides precise data for these parameters very quickly.
Ando Electric Co. Ltd.
McGraw Vincent P.
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