High-precision fiber frequency transmission system

Abstract

The invention discloses a high-precision fiber frequency transmission system, and the system comprises a PID circuit board, a phase discriminator, a photoelectric detector, a Faraday rotary reflector, a microwave photon phase shifter, a 2*2 optical coupler, a circulator, a slave laser, a frequency reference signal source, a main laser emitter, an isolator, an optical fiber link, and a time frequency receiving and transmitting module. On the basis of a single-fiber bidirectional return error signal obtaining mode, the system carries out the optical fiber link noise compensation based on injection locked coherent detection and the microwave photon phase shifter, thereby achieving the high-precision fiber frequency transmission. The system can achieve the high-precision recovery of a frequency reference signal of a local end at a far end. The system can achieve the two features, needed by phase change, on the same microwave photon phase shifter at the same time: large-bandwidth response and large dynamic range, facilitates the reduction of the complexity, and improves the stability and adaptability. The system can be used in the fields of comparison of the optical clock / atomic clock and the frequency transmission.

Description

technical field [0001] The present invention relates to high-precision frequency transmission, especially a high-precision optical fiber frequency transmission system, the main purpose of which is to compensate the link noise of frequency transmission in the optical fiber, so as to recover the frequency reference signal of the local end at the remote end with high precision, which can It is used in clock comparison, frequency transmission and other fields such as optical clock / atomic clock. Background technique [0002] Frequency standards are the basis of various important technologies in modern society, such as navigation and positioning, interconnection and communication, and accurate testing of physical constants. With the successful development of high-precision clocks such as hydrogen clocks, cold atomic clocks, fountain clocks, and optical clocks, the frequency standard accuracy is getting higher and higher, and the technology is becoming more and more mature. For exa...

AI Technical Summary

Problems solved by technology

However, it is difficult for the optical fiber delay line used in this method to simultaneously achieve high bandwidth response and large dynamic range. The cascading of two fiber delay lines with dynamic range and low bandwidth response (temperature control) characteristics will also lead to an increase in system complexity, and the piezoelectric ceramic and temperature-controlled fiber rings are very easy to cause polarization-dependent losses, etc. Some other problems limit the further improvement of system accuracy

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