| 摘要 |
PURPOSE:To provide the device which has a high-performance polarizing function or optical fiber transmission or measuring instrument with simple constitution wherein a periodic refractive index distribution is generated in an optical fiber having light induced refraction effect. CONSTITUTION:A periodic refractive index layer 3 is formed in the core 2 of the single-mode fiber which has light induced refractive index variation effect by projecting many interference fringes, which slant by 45 deg. or nearly 45 deg. to the length direction of the fiber and have optical intervals that are an integral multiple of one wavelength in the length direction of the fiber. Consequently, the (s)-polarized component of monochromatic light passing through this refractive index distribution layer is all radiated out of the fiber by interference effect, but the (p)-polarized component is passed as it is, so the polarization device of simple constitution which has a high degree of polarization is obtained. |
