Apparatus and method for measuring characteristics of optical fibers
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United States of America Patent
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Feb 20, 2007
Grant Date -
Jan 27, 2005
app pub date -
Jun 8, 2004
filing date -
Jul 24, 2003
priority date (Note) -
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Abstract
An apparatus and method for accurate measurement of characteristics of optical fibers (distribution of polarization mode dispersion and distribution of magnitude of birefringence). Pulse light is inputted to a subject optical fiber, back scattered light of the pulse light from the subject optical fiber is detected by a photodetector to find a Stokes vector, and polarization mode dispersion in a longitudinal direction is measured. The apparatus comprises a light source unit for outputting the pulse light having at least three different angular frequencies, and an arithmetic operation unit for calculating the magnitude of linear polarization components and the magnitude of a circular polarization component of a polarization dispersion vector on the basis of the Stokes vector and thus calculating polarization mode dispersion.
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