Patent ID: 6583909
Filing Date: 2003-06-24
Classification: H04B

Abstract:
An optical communication system comprising:an optical transmission device to convert an electric-signal type main signal into an optical-signal-type main signal; and a repeater to receive a main signal from the optical transmission device to transfer the main signal toward a reception device for a main signal, wherein the repeater has an automatic level controller to perform average level constant control on the main signal received from the optical transmission device and then output the main signal toward the reception device, the optical transmission device comprising an average level detector, having a detection band width equivalent to a response speed of the automatic level controller, to detect an average level detection signal, representing an average level of a main signal obtained immediately after the electrical signal type is converted into the optical signal type, from the main signal, the automatic level controller performs the average level constant control with reference to the average level detection signal detected by the average level detector.