| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the polarized crosstalks of an optical component, having a plane-of-polarization preserving structure. SOLUTION: Light, comprising only a single polarized components, is made to be incident on a plane-of-polarization preserving optical fiber coupler 1 to be measured, and an extinction ratio of the emitted lights from the plane-of- polarization preserving optical fiber coupler 1 is measured, while the phase difference between two polarization components emitted from the plane-of- polarization preserving optical fiber coupler 1 is changed, at least from a value smaller than (2n+1)×(π/2)} to a value larger than (2n+1)×(π/2)} (n: an integer of than 0 larger). The minimum value of this extinction ratio is set to the absolute value of the polarized crosstalk.
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