| 摘要 |
PURPOSE:To transmit digital data with high resistance to noise by combining the positions and numbers of wavelength areas of a lightless band formed to the communication light to transmit the data. CONSTITUTION:The light having a wavelength band of a fixed range is radiated to an electrical shutter group 5 containing plural shutter sections via a light source 1 which produces the light having the wavelength band of a fixed range, a polarizing glass 2, an electrical shutter 3 and a prism 4. The group 5 absorbs or cuts off the light of a specific wavelength band for formation of a lightless band and condenses the light to an optical fiber system light receiving part 7 via a condenser lens 6. The communication light formed into an image and synthesized at the part 7 is sent to an optical fiber output part 12 via an optical fiber system. Then the communication light sent to the part 12 is separated via the prism effect of a prism 14 owing to the refractive indexes different for each wavelength. A sensor group 15 detects the lightless band of the communication light and outputs the data signal to an output device 17 from a receiving CPU 16 by the detecting signal received from the detecting section corresponding to said lightless band. |
