| 摘要 |
PURPOSE:To transmit plural pieces of information regardless of transmission distance without deteriorating transmission quality, by transmitting light, which has wavelength selected according to the transmission distance, through one optical fiber by a wavelength-multiplex transmission system. CONSTITUTION:From cameras 61-64 at different distances to monitors 11-14 installed in a monitoring room etc., pictures are transmitted via one optical fiber cable consisting of optical fibers 71-74. When the cameras 61-64 send picture signals to optical transmitters 51-54, the transmitters 51-54 generate carriers with wavelengths lambda1-lambda4 assigned according to transmission distance, and then are modulated by the picture signals and applied to optical synthesizers 41-44, which receive them to transmit light waves of respective wavelengths each through optical fibers 71-74, respectively. Then, the transmitted optical picture signals are separated by an optical branching filter 3 into original waves by the wavelengths, which are supplied to optical receivers 21-24 to be converted into electric signals, which are supplied to the monitors 11-14. |
