Operating Principle Of Optical Terminals

- Jun 24, 2019-

The transmission equipment in optical communication system is mainly used for photoelectric conversion and transmission function, which is connected at both ends of the optical fiber.

Popular explanation: For example, surveillance cameras are installed in many corners of a large park. Engineers need to transfer the images captured by the cameras to the monitors so that staff can see the images of the monitored locations from the surveillance room. Think about this device. In the case of a large park with only one monitor room, there is a distance from each camera to the monitor, either long or short, that is, only 50 meters near the monitor room and 1200 meters long. The whole set of devices uses cables to transmit signals, usually copper-made metal cables. The metal cable has two faults. When the transmission distance exceeds 700 meters, the signal of the camera will be seriously damaged when it reaches the display, and nothing can be seen on the display. There are also strong magnetic field, strong electric field interference when the image can not be displayed properly, in most cases, nothing can be seen. The solution to these two problems is to abandon the use of metal cables and use optical fibers to transmit signals.image

What's the use of the optical terminal? We illustrate its role by solving the problem of long-distance transmission. Imagine cutting the metal cable connecting the camera and the monitor directly, connecting the 1200m long optical fiber in the middle, and wrapping tape around the interface. Is that possible? Of course not. Then you need the help of the optical terminal. Optical terminals are used in pairs. When the metal cable is cut off, one of the optical terminals is connected to the fracture of the metal cable connected to the camera by BNC video connection.

The function of the optical terminal is to convert the analog signal from the camera through a very short metal cable into optical signal, and then transmit the optical signal through a 1200 meter long optical fiber from its optical port. This optical fiber connects to the monitoring room 1200 meters away and to another optical terminal. The other optical terminal is connected with the optical fiber on one side, and the other side is also connected with the metal cable fracture connected to the display through the BNC video connection mode. Its function is to receive the optical signal from the optical fiber, and convert the optical signal back to the analog signal and transmit it to the display. So the monitor 1200 meters away can clearly display the image of the monitored position.

Optical terminals can transmit not only video signals, but also audio, telephone, network, and many kinds of control signals.image

Usually used in pairs, in the far end (transmitter) converts electrical signals into optical signals and transmits them to the near end (receiver) through optical fibers.

The optical signal is converted back to the electrical signal in the near end, that is to say, the signal transmitted through the optical terminal needs to be converted twice.

For the first time, the signal to be transmitted is converted into optical signal. After optical transmission, the optical signal is converted back to electrical signal for the second time.

The optical terminal only acts as a transmission role in the whole transmission process, does not change the essence of the signal, only undertakes the task of long-distance transmission.

In fact, the metal cables, optical transmitters, optical fibers, optical receivers and metal cables connected together can be understood as a whole cable, and optical terminals are only part of the cable.

Shenzhen Leitong Technology Co., Ltd. specializes in manufacturing optical fiber communication products. Welcome to call us for consultation.

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