| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical branching device or the like capable of almost uniformalizing branching ratios to each optical fiber without making a length of a light-transmissive medium longer, and moreover, simplifying the configuration. SOLUTION: An end face of the incident side of a light-transmissive medium 1 is provided with a light diffusing layer 2 for controlling a spread angle of a diffusion characteristic according to an end face of the output side. Diffusion signal light 51 diffused by the light diffusing layer 2 is made incident to optical fiber 3b with direct incident light 51a and totally reflected incident lights 51b, 51c superimposed. The same with other optical fibers 3a, 3c-3h. Therefore, it is possible to almost uniformalize branching ratios to each optical fiber 3a-3h without making a length of the light-transmissive medium longer, and moreover, simplify the configuration.
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