| 摘要 |
PURPOSE:To execute a coincidence adjustment of a polarization direction with a high accuracy by placing a 1/2 wavelength plate so as to be rotatable between the first and the second polarization plane maintaining optical fibers. CONSTITUTION:When plugs 7-a, b is inserted into a sleeve 10 of an adaptor, an emitted light of the first polarization plane maintaining optical fiber 6-2 is coupled with the second polarization plane optical fiber 6-b. As for a 1/2 wavelength plate 11, when its optical axis and a linearly polarized light direction of an incident light make an angle theta, a linearly polarized light direction of an emitted light is rotated by 2theta. Therefore, when the linearly polarized light direction from the first polarization plane maintaining optical fiber 6-a does not coincide with a polarization axis of th second polarization plane maintaining optical fiber 6-b, a linearly polarized light maintaining coincided with the polarization axis of the polarization plane maintaining optical fiber 6-b can be coupled with the polarization plane maintaining optical fiber 6-b by rotating a rotary frame 13. In this case, the adjustment can be executed easily by observing the quantity of light and the polarization plane of the emitted light of the other end of the polarization plane maintaining optical fiber 6-b. |
