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S-type reciprocating frequency conversion optical fiber high-precision frequency transmission system and method

A technology of frequency transmission and high precision, applied in the field of S-type round-trip variable frequency optical fiber high-precision frequency transmission system, can solve the problems of poor accuracy and reliability, avoid signal interference, avoid the decrease of stability index, and improve the limit of stability index Effect

Active Publication Date: 2020-04-07
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

However, the existing fiber-optic microwave frequency transmission schemes all transmit the same signal back and forth on a fiber-optic link. When weak signals are detected, they are easily interfered by local strong signals of the same frequency, and the transmission accuracy and reliability are poor.

Method used

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  • S-type reciprocating frequency conversion optical fiber high-precision frequency transmission system and method
  • S-type reciprocating frequency conversion optical fiber high-precision frequency transmission system and method
  • S-type reciprocating frequency conversion optical fiber high-precision frequency transmission system and method

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Embodiment Construction

[0028] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so that the protection scope of the present invention can be defined more clearly.

[0029] See figure 1 As shown, an S-type round-trip frequency conversion optical fiber high-precision frequency transmission system of the present invention includes: a local end 1, an optical fiber link 2, and a remote end 3. The local terminal 1 and the remote terminal 3 are connected by an optical fiber link 2.

[0030] See figure 2 As shown, the local end 1 includes a local end laser 4, a first electro-optic modulator 5, a first optical circulator 6, a first photodetector 7, a first low-noise amplifier 8, a 3-frequency divider 9, a 2-frequency multiplier 10 and power combiner 11.

[0031] The output end of the local laser 4 is connected to t...

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Abstract

The invention discloses an S-type round-trip frequency conversion type optical fiber high-precision frequency transmission system and method, and the transmission frequency f is achieved through S-type round-trip transmission of twice forward and one-time backward; a frequency converter component is used for changing the transmission main frequency while the transmission direction of each time ischanged; frequency signals, f / 3 frequency and f frequency, of twice forward transmission are mixed at the far end, wherein the f frequency signal is transmitted through an optical fiber link for one time, and the f / 3 frequency signal is transmitted through the optical fiber link for three times; according to the proportional relation of the signal frequencies, the two frequency signals are mixed and can offset the influence of the phase disturbance on the optical fiber link, so that a microwave frequency signal whose phase is synchronous with that of the reference signal at the local end is restored. The S path variable frequency transmission method is simple and easy to implement, the phase compensation structure is simplified, interference between a strong signal and a weak signal in thesame frequency in the station is avoided, and the quality of frequency transmission is further ensured.

Description

Technical field [0001] The invention relates to the technical field of optical fiber time-frequency transmission, in particular to an S-type round-trip frequency conversion optical fiber high-precision frequency transmission system and method. Background technique [0002] There are many ways to transmit frequency standards. The traditional frequency transmission method is mainly free-space propagation, including shortwave time service, longwave time service, GPS, etc. Optical fiber frequency transmission is an emerging optical fiber-based high-precision frequency signal transmission technology. When the optical signal loaded with the standard microwave frequency is transmitted along the optical fiber, the optical fiber is affected by changes in the external environment (such as temperature, humidity, stress, vibration, etc.), which will change the time delay of the optical carrier transmission, resulting in the deterioration of the transmission stability of the standard frequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/25H04B10/2507H04B10/2575H04B10/50H04B10/556
CPCH04B10/2507H04B10/25758H04B10/2589H04B10/25891H04B10/5051H04B10/5563
Inventor 姜海峰赵文宇赵粹臣闫露露张首刚
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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