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What is the difference between single-mode fiber optic cable and multi-mode fiber optic cable?

Single mode fiber can only transmit single-mode signals, while multimode fiber can transmit multimode signals. Multimode optical fiber (MMF), as the name suggests, is a fiber that can propagate multiple modes of electromagnetic waves (of course, light waves); Due to the presence of multiple modes of transmission, there is significant inter modal dispersion, resulting in a smaller capacity for transmitting information; The multimode fiber core is relatively large, generally 50um, with a numerical aperture of around 0.2; The number of molds depends on the diameter, numerical aperture, and wavelength of the fiber core.
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Analysis and Comparison of Monitoring Image Transmission Methods

In the monitoring system, the transmission of monitoring images is a crucial part of the entire system. The choice of medium and equipment to transmit images and other control signals will directly affect the quality and reliability of the monitoring system. At present, the media used to transmit image signals in monitoring systems mainly include coaxial cables, twisted pair cables, and optical fibers. The corresponding transmission equipment are coaxial video amplifiers, twisted pair video transmission equipment, and optical transceivers. To build a high-quality monitoring network, it is necessary to understand the characteristics and usage environment of these three main transmission methods, in order to adopt appropriate transmission media and equipment for practical engineering needs.
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Why is USB better than 1394 for data collection?

The biggest difference between 1394 and USB is that 1394 transmission does not require CPU involvement, and the two 1394 devices are connected in a peer-to-peer manner; When USB devices transmit data, they are not connected in a peer-to-peer manner, and one of them needs to act as the main device, requiring the participation of the CPU to work. Moreover, as the speed increases, the CPU occupancy rate will also increase.
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