Optical fiber microwave and optical frequency simultaneous transmission device and transmission method

Abstract

The invention discloses an optical fiber microwave and optical frequency simultaneous transmission device and transmission method. The optical fiber microwave and optical frequency simultaneous transmission device comprises a local end, an optical fiber link and a user end. Microwave and optical frequency are coupled at the local end through a broadband electro-optical coupling and frequency shifting unit, and THE coupled signals comprise two paths of optical frequency signals and are sent to the user end through the optical fiber link. the user end returns the received signals to the local end again through the same path via the frequency shift unit and the light reflection unit. The phase noise introduced by the optical fiber link is obtained by comparing the signals subjected to electro-optical conversion and frequency mixing processing with the phase frequency discrimination of a microwave signal to be transmitted at the local end, and the dynamic compensation of the phase noise introduced by the optical fiber link is realized by dynamically adjusting the working frequency loaded to the electro-optical coupling and frequency shifting module at the local end. Two paths of optical frequencies with stable phases and microwave signals with stable phases between the two paths of optical frequencies are obtained at the user end, so that simultaneous transmission of microwaves andoptical frequencies is realized. Broadband coupling of microwave and optical frequency and system compensation of phase noise are achieved through the broadband electro-optical coupling and frequencyshift module, integrated optical fiber microwave and optical frequency simultaneous transmission is achieved, and the system is simple in structure and high in reliability.

Description

technical field [0001] The invention relates to optical fiber time and frequency transmission, in particular to an optical fiber microwave and optical frequency simultaneous transmission device and transmission method. Background technique [0002] Time is the one with the highest measurement accuracy among the seven international basic units. In the above, the precise time frequency plays a crucial role. With the rapid development of optical frequency standard technology, it has become a strong contender for the next generation time-frequency reference. Although optical frequency has high frequency transmission stability, the current global commercial frequency standard is still dominated by microwave atomic clocks. Therefore, realizing simultaneous transmission of microwave and optical frequencies has important application value and practical significance. First of all, the development of next-generation time-frequency references based on optical clocks requires high-pr...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the optical frequency and microwave optical frequency transmission based on optical fiber links are separated, and there are few reports that a system can simultaneously transmit optical frequency and microwave frequency

At the same time, the way of separate delivery increases the complexity of the system

In order to overcome the defect that optical frequency and microwave frequency cannot be transmitted simultaneously, this paper proposes a method and system for simultaneous transmission of optical fiber microwave and optical frequency

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