| 摘要 |
PURPOSE:To improve the reliability of optical transmission, by equalizing the amount of light received at each photodetecting element by changing the amount of light dividing ratio at each light T-branch. CONSTITUTION:A channel 1a for transmitting light is composed of a light emitting element 31, a driving circuit 32, a photodetecting element 41, and an amplifying circuit 42. An optical fiber capable 4 connects the channel 1a with an IO controller 2a through a light variable T-branch 7 has a light variable T- coupler 7a. The amount of light dividing ratio of the branched light/transmitted light of the light T-branch 7 is variable, and the dividing ratio is changed by the IO controller 2a installed to the channel, so that the light receiving amount of each photodetecting element 41a is equalized. |
