| 摘要 |
PURPOSE:To previously prevent crosstalk so as to efficiently transmit information by setting the polarization directions of transmission and reception light beams so that they are orthogonal and separating the transmission and reception light beams through the use of the difference of the polarization directions. CONSTITUTION:Transmission devices 21A and 21B in same constitution are arranged so that they are confronted with each other in an equipment 20. A laser light source 22A emits the transmission light LA3 of a linear polarization wave in a polarization direction WSA, and the light is transmitted through lenses 24A and 5A after it passes through a lens 10A and a beam splitter 23A. The beam splitter of the device 21B transmits the polarization wave of laser light source 22B in a polarization wave direction WSB and reflects the polarization wave of WSA. Thus, the transmission and reception light beams are efficiently separated, and the deterioration of the quantity of light and crosstalk are previously prevented. |
