| 摘要 |
PURPOSE:To improve a bending light loss characteristic by constituting the title optical fiber of a central core having a specific refractive index difference DELTAto a core and clad and a peripheral core which has the specific refractive index difference DELTA' smaller than the specific refractive index difference DELTA and is added to the periphery of the central core. CONSTITUTION:The core of the optical fiber is formed of the central core 1 and the peripheral core 2 added to the outside circumference of the central core 1. The optical fiber is constituted by disposing the clad 3 to the outside of the peripheral core 2. Namely, the core is constituted of the entire part added with the peripheral core 2 having the specific refractive index difference DELTA' smaller than the specific refractive index difference DELTA of the central core 1 with respect to the clad to the outside circumference of the central core 1. The max. specific refractive index difference of the cores maintains about the same mode field diameter as the mode field diameter of the conventional optical fiber according to this constitution and the bending light loss is improved. |
