| 摘要 |
<P>PROBLEM TO BE SOLVED: To transmit a control signal to the reception side without being influenced by wavelength dispersion on the transmission line in a long haul optical transmitter, and to compensate for the wavelength dispersion of an optical main signal by the control signal on the reception side. <P>SOLUTION: On the transmission side of a long haul optical transmitter, a main signal is converted into an optical main signal, a control signal of lower frequency than the main signal is converted into an optical control signal and both signals are multiplexed, before being delivered as multiplex light to the transmission end of an optical transmission path. On the reception side, a component for compensating wavelength dispersion is detected from an optical main signal passing a variable dispersion compensation circuit, connected with the reception end of the optical transmission path, a control signal is also detected from multiplex light from the reception end, and the variable dispersion compensation circuit is controlled, by both detection signals, thus compensation for variable dispersion of the optical main signal received during transmission is carried out. <P>COPYRIGHT: (C)2009,JPO&INPIT |
