| 摘要 |
PURPOSE:To extent the transmission distance without increasing the intensity of the output of each light source. CONSTITUTION:An optical multiplexer 2 is attached to one end of an optical transmission line 1 consisting of optical fibers, and a light receiver 3 is attached to the other end, and output beams of light difference in wavelength from plural light sources 4a-4n are introduced to the optical multiplexer 2. The light receiver 3 has a sensitivity to any of output beams of light from light sources 4a-4n, and the same modulating signal 5 is supplied to all light sources. Consequently, an input power is equal to the sum of input powers Pa-Pn due to light sources; and though the modulated light is attenuated in a prescribed proportion while it is transmitted on the optical transmission line 1, the reception demodulating operation or the like is performed by the light receiver 3 to take out a required signal. |
