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A large-scale and high-precision delay measurement device and method for optical fiber links

A technology for optical fiber link and time delay measurement, which is used in optical fiber transmission, electrical components, and electromagnetic wave transmission systems. The effect of high measurement accuracy

Active Publication Date: 2021-06-29
ARMY ENG UNIV OF PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Purpose of the invention: In view of the large-range and high-precision requirements of optical fiber link time delay measurement, in order to solve the problem of insufficient measurement resolution and ambiguous phase indication in traditional methods, provide an accurate and large-range true time delay measurement device for optical fiber links

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  • A large-scale and high-precision delay measurement device and method for optical fiber links
  • A large-scale and high-precision delay measurement device and method for optical fiber links
  • A large-scale and high-precision delay measurement device and method for optical fiber links

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Embodiment Construction

[0018] The invention will be described in detail below with reference to the accompanying drawings.

[0019] Such as figure 1 The time extension measuring device of the present invention includes a precision frequency source module 1, a pulse generator 2, a subcarrier modulator 3, a laser 4, a fiber link 5, a backhavant module 6, and optical division. A device 7, the first measurement module, the second measurement module, and the delay calculation unit 15. Wherein, the first measurement module includes a first photodetector 8, a first filter 9, a pulse recovery 10, and a rising edge counter 11. The second measurement module includes a second photodetector 12, a second filter 13, and a trip.

[0020] The specific steps of the measurement of the fiber link delay using the above measuring device are as follows:

[0021] (1) Adjust 200 MHz precision frequency source module 1, generates a 200 MHz count frequency signal and a 1PPS reference pulse signal of homologous phase.

[0022] (2...

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Abstract

The invention provides a large-scale and high-precision time delay measuring device and method for an optical fiber link. The method adopts the subcarrier modulation of the counting pulse signal, and makes the counting pulse signal and the counting frequency signal under the condition of keeping the time delay consistent. Coexistence transmission, and through the combination of phase indication measurement and phase fine measurement, the absolute time delay of the optical fiber link and its time delay change can be accurately measured. The invention overcomes the problems of fuzzy phase measurement and insufficient range in the traditional optical fiber link time delay measurement method, and the time delay measurement accuracy can reach 0.1 ps. It has high measurement accuracy, wide application range and strong practical value.

Description

Technical field [0001] The present invention relates to a measuring apparatus and method of a fiber link, in particular, to a large number of fiber links, high-precision delay measuring devices and methods. Background technique [0002] Microwave photon technology combines two major disciplines of photon technology and microwave technology, using photonic means to generate, transmit, process, and regulate microwave signals, with large bandwidth, low loss, high precision, anti-interference, etc., in communication, detection The rails, navigation positioning and electronic fights have extensive application prospects and huge military value. In microwave photon applications, the fiber link delay is accurately regulated, and the implementation of broadband signal processing, coherent detection and other functions. Therefore, the high precision, large number of fiber links, online delay measurement, and dynamic compensation are extremely important for microwave photonic links. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/079H04B10/25H04B10/556H04B10/508
CPCH04B10/0795H04B10/25H04B10/508H04B10/5563
Inventor 郭俊成吴传信卢麟张宝富韦毅梅魏恒赵晓宇刘航
Owner ARMY ENG UNIV OF PLA