| 摘要 |
<P>PROBLEM TO BE SOLVED: To control the reception level of a control signal received by a second communication device Q1 to an appropriate level in an optical signal transmission system for transmitting an optical signal to the second communication device Q1 via an optical signal transmission path A1 after superimposing a communication signal to a control signal by a first communication device P1, and converting the control signal to an optical signal by electrical-to-optical converting means 8. <P>SOLUTION: In the first communication device P1, control signal level controlling means which is composed of an optical-to-electrical converter 1, an optical reception level detecting circuit 2, a CPU 4, a variable register 7, etc. is designed to control the level of the control signal before being converted to the optical signal by the electrical-to-optical converting means 8 so that the reception level of the control signal to be received by the second communication device Q1 becomes the predetermined level based on information on transmission condition of the control signal in relation to the second communication device Q1. <P>COPYRIGHT: (C)2004,JPO |
