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

A frequency transmission and high-precision technology, which is applied in the field of S-type reciprocating frequency conversion optical fiber high-precision frequency transmission system, can solve the problems of poor accuracy and reliability, avoid signal interference, improve the limit of stability indicators, and avoid the decline of stability indicators Effect

Active Publication Date: 2018-05-04
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 round-trip frequency conversion type optical fiber high-precision frequency transmission system and method
  • S-type round-trip frequency conversion type optical fiber high-precision frequency transmission system and method
  • S-type round-trip frequency conversion type 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 as to define the protection scope of the present invention more clearly.

[0029] see figure 1 As shown, the present invention is an S-type reciprocating frequency conversion optical fiber high-precision frequency transmission system, including: a local terminal 1, an optical fiber link 2 and a remote terminal 3. The local end 1 and the remote end 3 are connected through an optical fiber link 2 .

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

[0031]The output end of the local end las...

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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 back-and-forth 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 methods are mainly free space propagation, including short-wave timing, long-wave timing, and GPS. Optical fiber frequency transmission is a new high-precision frequency signal transmission technology based on optical fiber. When an optical signal loaded with a 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 deterioration of the stability of the standard frequency transmission. Using ...

Claims

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Application Information

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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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