| 摘要 |
PURPOSE:To prevent the increase of near-end crosstalk by making a light branching filter have the temperature dependability which is almost equal to the wave length temperature coefficient of the LED. CONSTITUTION:An atmospheric temperature around the LED's 11, 15 is detected by the temperature sensors 41, 43. The light branching filters 12, 16 are rotated by the outputs of the temperature sensors 41, 43, and the rotary driving mechanisms 42, 44 for varying the angle of incident of light beam are controlled. Therefore, a variation of the near-end crosstalk due to deviation of the wave length caused by the temperature variation of the LED's 11, 15 is offset to prevent from increasing and it is possible to execute a satisfactory light multiplex transmission to the respective light branching filters 13, 7. |
