| 摘要 |
PURPOSE:To prevent the transmission of interference waves to other stations by adopting the constitution such that a control circuit is used so as to control a controller or a light generator thereby interrupting the transmission of a transmission optical frequency signal or reducing its transmission level. CONSTITUTION:A power supply of an optical transmitter 2 is operated, the power supply is in switching control from the OFF state into the ON state and when the optical transmitter 2 is started, a control circuit 23 as the AFC system acts effectively and while a normal optical transmission frequency signal is stably led out from an optical generator 21, the control circuit 23 controls a controller 24 thereby interrupting the signal from the optical generator 21 so as not to be sent to a transmission optical fiber 4. Thus, an unstable optical transmission frequency signal when the optical transmitter 2 is being started is not leaked externally with the interruption of the transmission by the controller 2 and a leaked wave is prevented from being an interference wave at a transmission or reception frequency band of other terminal stations. |
