| 摘要 |
A prism 11 is formed which has a first face 11 a opposing an end face of an optical fiber 21 and receiving a light-to-be-received from the optical fiber, second and third faces 11 b and 11 c adjoining opposite ends of the first face 11 a at right angles and opposing each other, a fourth face 11 d for reflecting the light-to-be-received from the face 11 a toward the face 11 b, and a fifth face 11 e reflecting a light-to-be-transmitted as projected from a light source through the face 11 c toward the face 11 a. First and second light-to-be-received converging lenses 12 and 13 are disposed on the faces 11 a and 11 b of the prism 11 and first and second light-to-be-transmitted converging lenses 14 and 15 are disposed on the faces 11 a and 11 c. The tilt angles beta 1 and beta 2 of the faces 11 d and 11 e with respect to the optical fiber axis 21 a are less than 45°. With this configuration, if the light-to-be-received enters the light-receiving element 22 and the light-emitting element 23 and is reflected by these elements, such reflected light is prevented from returning back into the optical fiber whereby occurrence of far-end crosstalk can be suppressed. |
