| 摘要 |
PROBLEM TO BE SOLVED: To adjust a polarization direction with high precision and further to reduce even a manufacturing cost. SOLUTION: Light L1 having a shorter wavelength than the wavelength in use is made incident on an optical fiber 12 from a white light source 54, for example, the optical fiber 12 is relatively rotated to a second array 18 while observing the image of light L2 exited from the end face (the end face of the second array 18 side) of the optical fiber 12, for example, the direction of the major axis of the elliptic spot 70 of an LP01 linear polarizing mode and the arraying direction of two spots in an LP11, linear polarizing mode are matched to the direction of the basic axis for mounting, for example, the horizontal axis 86 displayed on a monitor 62.
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