| 摘要 |
PURPOSE:To raise a polarization plane saving characteristic to a practicable value by winding an optical fiber which consists of a triple structure of a core, a clad and a jacket, and sets a ratio of a refractive index difference of the core and the clad to a specified %, to a drum. CONSTITUTION:An optical fiber 24 which consists of a triple structure of each core 21 having a circular section, a clad and a jacket core, and selects a ratio of a refractive index of the core 21 and the clad 22 to 0.13 is wound about 500m to a drum 25 having 150mm. diameter. Subsequently, when semiconductor laser light of 0.78 micron is provided to the start end from a polarizing prism 26 and lens systems 27, 27' and a laser light of a linear polarization plane is propagated into a coil, and it is detected by a condensing lens 28 of the other end, a rotary analyzer 20, a detector 30 and an output meter 31, a polarization plane saving light can be detected. |
