| 摘要 |
PURPOSE:To obtain the optical fiber type polarizing element which can be formed to a straight shape, has high strength, is easy to work and can be easily adjusted in the difference in attenuation constants between modes. CONSTITUTION:The clad of the optical fiber is partly removed in such a manner that the thicknesses d1, d2, d3 in the state of the core 11 of the clad 13 changes stepwise along the optical axis direction. Such loss film layers 21, 23, 25 which affect the confinement of an electromagnetic field distribution of light in the removed part c are loaded by vapor deposition, etc., on the part. As a result, either one mode of a TE0 mode and TM0 mode is propagated. |
