| 摘要 |
PURPOSE:To provide directivity to light propagation direction by bonding optical fibers having different refractive indices. CONSTITUTION:A fiber I and a fiber II are bonded at an angle of inclination (a). The core refractive index of the fiber I is let n1, the clad refractive index n3, the core diameter (a) and the core refractive index of the core II is let n2, the clad refractive index n4 and the core diameter (b). If it is assumed that the luminous flux having an angle theta1 with respect to the fiber axis entered the fiber I from the outside, then the mode distribution in the fibers becomes constant. Here, when n2<= n3, the light from the first fiber may be led to the second fiber without any loss of light. |
