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Tool to Measure the Beam Center Ratio of Fiber-Optic Optical Trans Mitter Sub-Assemblies

IP.com Disclosure Number: IPCOM000120061D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Lasky, RC: AUTHOR [+2]

Abstract

Disclosed is a tool which is used to measure the Beam Center Ratio (BCR) of Transmitter Optical Sub-assemblies (TOSAs). When attached to the TOSA (by threaded member), the tool rotates a fiber within the TOSA bore, while maintaining an offset force which forces the fiber to circumsubscribe the inner diameter of the bore. The consistency of the tool over a manual rotation method has proved to be critical in making BCR measurements.

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Tool to Measure the Beam Center Ratio of Fiber-Optic Optical Trans
Mitter Sub-Assemblies

      Disclosed is a tool which is used to measure the Beam
Center Ratio (BCR) of Transmitter Optical Sub-assemblies (TOSAs).
When attached to the TOSA (by threaded member), the tool rotates a
fiber within the TOSA bore, while maintaining an offset force which
forces the fiber to circumsubscribe the inner diameter of the bore.
The consistency of the tool over a manual rotation method has proved
to be critical in making BCR measurements.

      The BCR test was developed to predict plug repeatability of
power launched into a fiber-optic cable from a TOSA.  This test is
performed by using a purposely offset fiber and rotating it within
the TOSA while applying an off-axis force in the direction of the
offset.  This action results in the fiber core scribing a circle at
the TOSA optical reference plane.  The difference between the maximum
and minimum power launched into a fiber during this test is called
the BCR.  The BCR has been theoretically and experimentally
correlated to plug repeatability.  The BCR test was at first
performed by hand (Figure 1).  The lack of control of the off-axis
force, when performed by hand, resulted in inconsistent BCR
measurements.

      This tool allows this measurement to be made with significantly
greater repeatability than by hand.  The body of the tool threads
onto the TOSA and creates the surface onto which the rotating disk
rotates (Fi...