Free space frequency transfer system and method based on optical path compensator
A technology of frequency transmission and free space, applied in transmission systems, electromagnetic wave transmission systems, electromagnetic transmitters, etc., can solve the problems of short transmission distance and low precision, achieve good frequency synchronization, and realize the effect of frequency synchronization
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Embodiment 1
[0024] A free-space frequency transfer system based on an optical path compensator, such as figure 1 , including a transmitting end and a receiving end, the transmitting end is provided with a frequency source, the radio frequency signal is loaded to the optical radio frequency module on the continuous laser through the mode of amplitude modulation, and the optical path propagation module for realizing the transmission of the optical carrier, the receiving end The optical signal fed back obtains the phase difference and then outputs a signal to control the digital PI control module that the optical path compensator operates, and is controlled by the digital PI control module to realize the optical path compensator that changes the optical path; the receiving end is provided with a first detection optical path a photodetector;
[0025] The frequency source is sequentially connected to the optical path compensator through the optical radio frequency module and the optical path p...
Embodiment 2
[0028] In this embodiment, on the basis of Embodiment 1, the optical path propagation module includes a half-wave plate, a beam splitter, a quarter-wave plate and two mirrors arranged in sequence.
[0029] The optical path compensator includes a piezoelectric ceramic and a mobile platform, the piezoelectric ceramic is arranged on the mobile platform, and the piezoelectric ceramic connects two reflectors to control the distance between the two reflectors and the angle of the two reflectors .
[0030] The digital PI control module includes a second photodetector that receives the optical signal fed back by the receiving end, a phase detector that obtains a phase difference signal, and takes the phase difference signal obtained by the phase detector as input and simultaneously outputs a control that controls the optical path compensator signal to a digital PI controller.
[0031]Working principle: The RF signal is loaded onto the continuous laser at the transmitting end to form ...
Embodiment 3
[0034] A free-space frequency transfer method based on an optical path compensator, based on the free-space frequency transfer system described in Embodiment 1 or 2 above, the radio frequency signal generated by the frequency source is loaded onto the continuous laser through an optical radio frequency module to form an optical The carrier is transmitted to the receiving end after passing through the optical path propagation module. The first photodetector at the receiving end feeds the optical carrier back to the transmitting end after receiving the optical carrier. The digital PI control module at the transmitting end receives the optical carrier fed back by the receiving end. Finally, the digital PI control module controls the optical path propagation module through the optical path compensator to control the phase of the optical carrier according to the acquired phase difference of the optical carrier fed back.
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