The analog optical transceiver adopts the PFM modulation technology to transmit image signals in real time, which is one of the most used ones in previous years. The transmit end first performs the PFM modulation on the analog video signal, and then performs the electro-optical conversion. After the optical signal is transmitted to the receiving end, the optical-electrical conversion is performed, and then the PFM demodulation is performed to recover the video signal. Due to the adoption of PFM modulation technology, the transmission distance can easily reach around 30Km, and the transmission distance of some products can reach 80Km or even hundreds of kilometers. Moreover, the image signal has little distortion after transmission, and has a high signal-to-noise ratio and little nonlinear distortion. By using wavelength division multiplexing technology, it is also possible to realize bi-directional transmission of image and data signals on a single optical fiber to meet the actual needs of the monitoring project.
Because digital technology has obvious advantages in many aspects compared with traditional analog technologies, just as digital technology has replaced analog technology in many areas, the digitalization of optical transceivers has become the mainstream trend of optical transceivers. At present, there are two main technical methods for digital image optical transceivers: one is an MPEGII image compression digital optical transceiver and the other is a non-compressed digital image optical transceiver. Image compression digital optical transceivers generally use MPEGII image compression technology, which can compress moving images into N×2Mbps data streams and transmit them over standard telecommunications interfaces or directly over optical fibers. Due to the use of image compression technology, it can greatly reduce the signal transmission bandwidth.
If the front end adopts analog camera signals or analog wireless monitoring equipment, the analog video optical transceiver is used to convert the signal; if the front end uses a network camera or a wireless bridge, the digital video optical transceiver can be used to convert the video signal through the optical fiber.
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