Delay-locked-loop-based remote microwave signal phase-stabilized optical fiber transmission device

A delay-locked loop and microwave signal technology, which is applied in the field of microwave photonics, can solve the problems of microwave signal phase asynchrony, etc., and achieve the effects of easy long-distance transmission, high stability, and large correction range

Inactive Publication Date: 2011-10-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention utilizes the nonlinear effect of the electro-optical modulator to realize photoelectric heterodyne mixing for phase detection, drives and controls the microwave delayer through the feedback phase difference signal, changes the phase of the microwave signal, and compensates the microwave signal phase dist

Method used

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  • Delay-locked-loop-based remote microwave signal phase-stabilized optical fiber transmission device
  • Delay-locked-loop-based remote microwave signal phase-stabilized optical fiber transmission device
  • Delay-locked-loop-based remote microwave signal phase-stabilized optical fiber transmission device

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Embodiment

[0021] Such as figure 1 As shown, this embodiment includes: a local end, a remote end and an optical fiber transmission link connected therebetween to transmit optical signals, wherein:

[0022]The local end includes: microwave source 1, microwave power divider 2, microwave delayer 3, intermediate frequency source 4, intermediate frequency power divider 5, single sideband modulator 6, laser 7, optical modulator 8, circulator 9 , a photoelectric mixer 14, a phase difference detection unit 15 and a level adjustment unit 16, wherein: the microwave source 1 is connected to the microwave power divider 2 and output to the microwave delay device 3, and the microwave delay device 3 has a first microwave delay device inside 3-1 and the second microwave delayer 3-2 are respectively connected to the radio frequency input end of the optical modulator 8 and the SSB modulator 6; the optical input end of the optical modulator 8 is connected to the laser 7, and the output end is connected to ...

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Abstract

The invention discloses a delay-locked-loop-based remote microwave signal phase-stabilized optical fiber transmission device, which realizes the phase synchronization of a local microwave signal and a remote microwave signal by utilizing a delay-locked loop. The device realizes optoelectronic heterodyne mixing by utilizing the nonlinear effects of an optoelectronic modulator for phase detection, drives and controls a microwave delayer by feeding a phase difference signal back, performs phase change on the microwave signals, compensates microwave signal phase disturbance caused by the delay change of a transmission link, keeps a phase synchronism relationship between the local microwave signal and the remote microwave signal, solves the problem of phase asynchronism between the local microwave signal and the remote microwave signal, fulfills the aim of phase-stabilized transmission of the microwave signals, adopts noncoherent correction, and has the advantages of wide dynamic range, high stability and the like, besides a long phase-stabilized transmission distance.

Description

technical field [0001] The invention relates to a device for phase-stable transmission of microwave local oscillator signals through optical fibers in the field of microwave photonics, in particular to a long-distance phase-stable optical fiber transmission device for microwave signals based on a delay-locked loop. Background technique [0002] At present, many precise measurements require the long-distance phase-stable transmission of microwave signals, such as the distribution of atomic clocks, the distribution of local oscillator signals in millimeter-wave interferometric antenna arrays for astronomical detection, and so on. The traditional microwave signal transmission uses a phase-stable coaxial cable, but due to the large loss of the cable, it cannot support long-distance transmission of more than tens of kilometers. Optical fiber is considered to be the best medium for long-distance transmission of microwave signals due to its low loss and anti-electromagnetic interfe...

Claims

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Application Information

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IPC IPC(8): H04L7/033H04B10/12H04B10/25
Inventor 常乐董毅章璐敏何浩胡卫生
Owner SHANGHAI JIAO TONG UNIV
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