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Method and Apparatus for Testing Concentricity of Optical Fiber in Connector and for Testing Loss in Fiber Cable

IP.com Disclosure Number: IPCOM000040327D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Garde, JA: AUTHOR [+2]

Abstract

Two X-Y positioner stages each have means to receive one fiber-optic connector of a cable that is to be tested and another connector of a cable that is a permanent part of the test apparatus. One of the permanent cables is connected to a light source, and the other one is connected to a light receiver. During a test, light from the source is transmitted to the receiver along a path that includes the test cable and its two connectors and the two permanent cables and the two permanent connectors. During a test, the value of light measured at the receiver is subtracted from the value measured during a calibration test that is made without a test cable.

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Method and Apparatus for Testing Concentricity of Optical Fiber in Connector and for Testing Loss in Fiber Cable

Two X-Y positioner stages each have means to receive one fiber-optic connector of a cable that is to be tested and another connector of a cable that is a permanent part of the test apparatus. One of the permanent cables is connected to a light source, and the other one is connected to a light receiver. During a test, light from the source is transmitted to the receiver along a path that includes the test cable and its two connectors and the two permanent cables and the two permanent connectors. During a test, the value of light measured at the receiver is subtracted from the value measured during a calibration test that is made without a test cable. For the calibration test, the two permanent cables are connected to one of the X-Y stages, the stage is adjusted for a maximum light at the receiver, and the value at the receiver is recorded. A cable to be tested is connected to the two X-Y stages, the stages are set to a reference position, and the loss is measured. At the reference position the optical center of the permanent connector is coincident with the mechanical center of the test connector. However, the optical center of the test connector might not be coincident with the optical center of the permanent connector. Each stage is then adjusted to align the optical centers of the fibers, as indicated when a minimum loss value is measured at the rece...