The analog optical transceiver uses PFM modulation technology to transmit image signals in real time. The transmitting end first performs PFM modulation on the analog video signal, and then performs electro-optical conversion. After the optical signal is transmitted to the receiving end, optical-electrical conversion is performed, and then PFM demodulation is performed to recover the video signal. Due to the PFM modulation technology, the transmission distance can reach 50Km or more. By using wavelength division multiplexing technology, it is also possible to realize bidirectional transmission of image and data signals on one optical fiber to meet the actual needs of monitoring engineering. This analog optical transceiver also has some disadvantages:
a) production and debugging is more difficult;
b) It is difficult to realize multi-channel image transmission by a single optical fiber, and the performance will be degraded. At present, such an analog optical transceiver can generally only transmit four channels of images on a single optical fiber;
c) Poor anti-interference ability, which is greatly affected by environmental factors and has temperature drift;
d) Due to the use of analog modulation and demodulation technology, its stability is not high enough, with the increase of use time or environment
Sexual changes, the performance of the optical transceiver will also change, bringing some inconvenience to the use of the project.
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