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Wang, Xiangchuan; Li, Shupeng; Jiang, Xin; Hu, Jintao; Xue, Min; Xu, Shangzhe; Pan, Shilong

doi:10.3788/col201917.060601

Cited by 23 publications

(2 citation statements)

References 42 publications

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“…light along the fiber, thus obtaining the fiber length after data processing. Generally speaking, commercial OTDR has a maximum measurement length of tens of kilometers, but its resolution is comparatively low, only up to the order of 0.1 km [4]. To improve the OTDR measurement range, v-OTDR was developed with the introduction of a single-photon detector in OTDR.…”

Section: Introductionmentioning

confidence: 99%

A long-haul and high-accuracy fiber length measurement technology based on Mach-Zehnder and Sagnac hybrid interferometer

Hao

Tang

et al. 2021

Meas. Sci. Technol.

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In this paper, an optical fiber length measurement system based on phase-modulated pulse time of flight method is proposed. The fiber length is calculated by measuring the flight time of the phase-modulated pulse in the fiber under test. The measurement system is based on the interference structure of Mach–Zehnder hybrid Sagnac to obtain stable interference effects. To improve the signal-to-noise ratio of the system, the phase-generated carrier technique is utilized to effectively eliminate the parasitic Rayleigh scattering noise along the optical fiber. Finally, a balance of long measurement distance and high measurement precision is achieved in the system, and a measurement resolution of 0.2 m is realized within the measurement range of 100 km.

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Section: Introductionmentioning

confidence: 99%

A long-haul and high-accuracy fiber length measurement technology based on Mach-Zehnder and Sagnac hybrid interferometer

Hao

Tang

et al. 2021

Meas. Sci. Technol.

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“…1 引言光纤延时器是利用光信号在光纤传输过程中产生的时间延迟设计而成的光学延时系统, 一般由延时光纤、光纤跳线和光开关组成: 脉冲激光信号经Y型光纤分束后, 通过两路延时光纤分别入射到探测器中, 利用光开关控制两路延时光纤的长度差, 从而实现光学延时控制 [1,2] . 相比于电延时系统, 光纤延时系统具有延时稳定性高、抗干扰能力强、延时损耗低等特点, 可以兼顾宽延时范围和高延时精度 [3,4] . 光纤延时系统在光控相控阵天线、雷达分布式网络、干涉型光纤水听器和高速光电芯片等领域都有广泛应用, 这些应用领域对光纤延时系统的精度和稳定性提出了较高要求 [5] .…”

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Accurate measurement of optical fiber time delay based on frequency domain reflectometry

et al. 2021

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Optical fiber time delay system has been widely used in optical-controlled phased array antenna, radar distributed network, interferometric optical fiber hydrophone and high-speed photoelectric chip. These applications require high-accuracy and high-stability time delay generated by the system. Time delay measurement directly determines the precision and resolution of the system. Therefore, high-precision time delay measurement method is of great significance in developing the optical fiber delay system. In this paper, progress and problems of optical fiber time delay measurements are discussed. A new method of precisely measuring the time delay in optical fiber is proposed. We use the frequency domain reflectometry (FDR) to avoid the discrepancy between measuring range and measuring precision, which exists in both time-of-flight (TOF) method and phase discrimination approach. An intensity modulated 1064 nm laser signal is used as a light source. The modulation frequency is tuned from 10 MHz to 200 MHz in steps of 0.5 MHz. The spectrum of echo signal is obtained by measuring the amplitudes and phases of echo signals at different frequency points. The delay information is obtained via the inverse fast Fourier transform (IFFT). The precision of delay measurement in our method is determined by step size of frequency variation, and a higher-precision measurement is realized by using interpolation zero algorithm. Since our method is not to modulate the optical frequency, but to control the frequency of the modulation signal loaded on the electro-optic modulator, it is easy to achieve the high-precision and high-linearity frequency modulation. In this paper, theoretical analysis and time delay measurement are used to compare the FDR method with conventional TOF measurement method. The accurate measurement of 33–200 ps is realized, and measurement error is lower than 7 ps. We also design an incremental measurement experiment to study the resolution of the FDR method, which achieves a delay resolution of 3.3 ps. The influence of temperature jitter is analyzed to prove the reliability of experimental results. It proves that the FDR method has a higher measuring accuracy than the TOF method. The time delay measurement precision can be further improved by expanding the modulation bandwidth. Our method is to be applied to an optical fiber delay system to improve the precision and resolution of system delay.

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Magnetic photonic crystal circulator based on gradient changing width waveguide

Zhang

Zeng

et al. 2019

Optik

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Cited by 23 publications

References 42 publications

A long-haul and high-accuracy fiber length measurement technology based on Mach-Zehnder and Sagnac hybrid interferometer

A long-haul and high-accuracy fiber length measurement technology based on Mach-Zehnder and Sagnac hybrid interferometer

Accurate measurement of optical fiber time delay based on frequency domain reflectometry

Magnetic photonic crystal circulator based on gradient changing width waveguide

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