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Optical Frequency Domain Reflectometry Method and System Based on Frequency Synthesis

A technology of optical frequency domain reflection and frequency synthesis, applied in the field of optical sensing, it can solve the problems of limited filtering effect, filter performance, inability to completely suppress other sidebands, affecting frequency sweep performance, etc., and achieve good single sideband frequency sweeping. effect, low insertion loss, improved spatial resolution effect

Active Publication Date: 2017-10-03
宁波联河光子技术有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

However, the hardware complexity of this technology is high, and the filtering effect is limited by the performance of the filter. It cannot completely suppress other sidebands, which seriously affects the frequency sweep performance. Optical amplifier amplifies, bringing additional phase noise

Method used

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  • Optical Frequency Domain Reflectometry Method and System Based on Frequency Synthesis
  • Optical Frequency Domain Reflectometry Method and System Based on Frequency Synthesis
  • Optical Frequency Domain Reflectometry Method and System Based on Frequency Synthesis

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Embodiment 1

[0033] Such as figure 1 As shown, this embodiment includes: a test fiber 9, a signal generation module, a narrow linewidth laser light source module connected in sequence, an optical comb generation module, a frequency sweep and pulse cutting module, a coherent receiving module, a photoelectric conversion module and a digital signal processing module, Wherein: the coherent receiving module is connected with the test optical fiber 9,

[0034] Described signal generation module is dual-channel arbitrary waveform generator 7, and this dual-channel arbitrary waveform generator 7 outputs amplified single-frequency sinusoidal signal 11 and frequency-sweeping radio frequency pulse signal respectively to optical comb generating module and frequency-sweeping pulse-cutting module 12, and send trigger and reference clock signals to the digital signal processing module.

[0035] The frequency of the single-frequency sinusoidal signal 11 is 40MHz, and the initial phase is 0°.

[0036] Th...

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Abstract

The invention relates to a frequency combination-based optical frequency domain reflection method and system. According to the frequency combination-based optical frequency domain reflection method and system, electro-optic modulation and acousto-optic modulation are performed on local light, so that optical pulses can be obtained; the optical pulses, adopted as detection pulse optical signals, are inputted into a test optical fiber; coupling and frequency beating are performed on obtained Rayleigh backscattered optical signals and the local light; obtained optical signals are subjected to photoelectric conversion and demodulation; and therefore, an optical frequency reflectometer can be obtained. According to the electro-optic modulation, single-frequency signals are adopted to perform modulation. According to the acousto-optic modulation, pulse signals are adopted to perform modulation. A plurality of frequency components of optical combed signals obtained through the electro-optic modulation are simultaneously subjected to frequency sweeping, so that optical pulses can be obtained. The frequency combination-based optical frequency domain reflection method and system have the advantages of large detection range, high spatial resolution, low hardware cost and low software complexity.

Description

technical field [0001] The present invention relates to a technology in the field of optical sensing, in particular to an optical frequency domain reflectometer method and system based on frequency synthesis. Background technique [0002] Since the 1970s, optical fiber communication technology has developed rapidly due to its advantages such as ultra-large transmission bandwidth and ultra-low transmission loss. At the same time as the optical fiber communication technology, the rapid development is also the optical fiber sensing technology. Optical fiber sensing technology refers to the technology of measuring external physical signals (such as temperature and strain) or various parameters of optical fibers with light waves as the carrier and optical fibers as the medium. Compared with traditional mechanical or electromagnetic sensors, fiber optic sensors have great advantages, such as no noise generated by electromagnetic interference, and can work stably in a strong elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/071
CPCH04B10/071
Inventor 何祖源刘庆文樊昕昱陈典
Owner 宁波联河光子技术有限公司
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