Stable frequency transmission method and system

Abstract

The invention provides a stable frequency transmission method and a system. The method includes: generating a stable frequency standard signal in a central station; using a tunable laser to generate an optical carrier; modulating the frequency standard signal to the optical carrier to form an initial optical signal; transmitting the initial optical signal to a far end through an optical fiber; returning a part of the far-end optical signal to the same optical fiber to the central station; demodulating the return optical signal to obtain a return RF signal; comparing the phase difference of the return RF signal and the frequency standard signal; controlling the tunable laser according to the phase difference to change the wavelength of the optical carrier, obtaining a compensated optical carrier, and enabling the sum of the chromatic dispersion delay inequality of the compensated optical carrier and the initial optical carrier and the link delay variation caused by environmental factors of temperature change and vibration to be zero; and demodulating the stabilized far-end optical signal to obtain a far-end RF signal and outputting the far-end RF signal. The stable frequency transmission method uses the optical fiber both as a transmission medium and a compensation device, an additional compensation device does not need to be added to realize a delay / phase jitter compensation process, the system structure is simple, and the practicability is strong.

Description

technical field [0001] The present invention relates to the field of signal transmission, in particular to a frequency stabilization transmission method and system. Background technique [0002] High-precision, high-stability frequency standard transmission technology is a new technology developed under the impetus of modern science and technology and practical application requirements. High-precision and high-stability frequency standards are required in many fields such as basic scientific research, astronomical observation, aerospace exploration, communication and navigation. However, the generation and use of high-stable frequency standards are often not at the same place, so a high-precision frequency standard needs to be stably delivered to the remote end. Using optical fiber for high-precision frequency standard transmission has many advantages, such as low loss and immunity to electromagnetic radiation interference. However, the optical fiber is affected by environ...

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Problems solved by technology

[0006] The present invention provides a frequency stabilization transmission method and system to solve the technical problems in the prior art that an additional compensation device needs to be added to realize fiber link time delay jitter compensation and the system structure is complex

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