Optical transceiver is a kind of Ethernet media transmission equipment that can not only transmit video signals, but also transmit audio, telephone, network, and many kinds of control signals. At present, it is mainly used in the security monitoring industry. So, how to use the optical transceiver, let's let the editor of Feichang Technology introduce in detail the use of the optical transceiver!
Optical transceivers are mainly used in: intelligent traffic monitoring systems, large-capacity security systems, television medical care, safety engineering, long-distance broadcast and television transmission systems, remote multimedia teaching/campus monitoring, video teleconferences, building control systems, high-definition video, audio Occasions and so on.
At short distances, our video surveillance connection looks like this: (A: surveillance camera, B; monitor and display, C: video cable). We can directly connect the monitoring and display equipment with a video cable (commonly called a daisy cable), but when the distance exceeds a certain distance, since the video cable is made of copper core, the analog signal transmitted will increase with the distance , The weaker the signal, the video at the end of the monitor will eventually be seen to be blurry, sometimes intermittently, and the monitoring effect cannot be achieved. In this case, the optical transceiver came into being.
Optical transceivers are used in pairs, usually we become A and B. We cut off the C (that is, the video cable) in the above picture, A connects the A terminal of the optical transceiver, B connects the B terminal of the optical transceiver, and the A and B ends Connect with optical fiber.
One way of video surveillance connection, the surveillance camera is connected to the pnc interface of the optical transceiver A, and the analog signal is converted into an optical signal, which is transmitted to B through the optical fiber cable, and then the optical signal is converted into an electrical signal by the optical transceiver B and transmitted to the monitoring terminal. Video monitoring achieves the purpose of remote and clear monitoring.
In addition, precautions for the purchase of optical transceivers: from the signal sent to the optical fiber, optical transceivers can be divided into analog optical transceivers based on analog technology and digital optical transceivers based on digital technology. The working principle of analog optical transceiver is nothing more than modulation and demodulation, filtering and signal mixing. Whether it is LED or LD, its photoelectric modulation characteristics are not linear, and it is inevitable that distortion, interference and other inevitable problems in analog processing will occur during signal transmission, and there are insurmountable technologies in large-capacity transmission and multi-service mixed transmission. difficulty.