Frequency division multiplexing OTDR with fast signal processing

Liu, Lu; Song, Yuejiang; Zhang, Xuping; Zhu, Fan

doi:10.1016/j.optlastec.2012.02.037

Cited by 26 publications

(22 citation statements)

References 21 publications

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“…An AOM2 which has the same frequency shift with AOM1 is adopted to make the frequency of LO the same with the 0 order frequency of the multi-frequency probe pulse propagating in FUT, so the heterodyne between the ±1st sidebands and LO respectively generates two IFs with the same frequency [6]. Then the LO can be written as,…”

Section: Principle Of the Tdm-otdrmentioning

confidence: 99%

“…The measurement DR is strongly dependent on averaging the results of a large number of measurements [2]- [6]. For quickly increasing measurement number, an M-ary frequency shift keying (FSK) probe method was proposed [3].…”

Section: Introductionmentioning

confidence: 99%

“…Experiment using ten sequential probe frequencies was conducted and experimental results showed a 5.0 dB DR improvement. The measurement speed was near 10 times faster than that of conventional C-OTDR [4], however, by this method only one sideband of the multi-frequency light from the PM was used, which wasted much of the light power, and the DR enhancement was only dependent on increasing measurement number to reduce noise level [5], [6].…”

Section: Introductionmentioning

confidence: 99%

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Time Division Multiplexing Optical Time Domain Reflectometry Based on Dual Frequency Probe

Zhang

Song

Liu

2012

IEEE Photon. Technol. Lett.

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A new frequency coding method is proposed and experimentally demonstrated that employs a phase modulator driven by sequential radio frequency and a synchronously controlled acoustooptic modulator to generate time division multiplexing probe pulses for coherent optical time domain reflectometry (C-OTDR). Each probe pulse contains two probe frequencies that are symmetrical regarding the frequency of local oscillator (LO). Heterodyne between the backscattered Rayleigh light of the dual frequency probe pulse and LO generates the same intermediate frequency. Experimental results show that the new C-OTDR, using ten frequency-coded probe pulses, brings an 8.0-dB dynamic range enhancement, compared with conventional C-OTDR.Index Terms-Coherent detection, frequency-coded probe pulse, optical time domain reflectometry, time division multiplexing.

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Section: Principle Of the Tdm-otdrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Time Division Multiplexing Optical Time Domain Reflectometry Based on Dual Frequency Probe

Zhang

Song

Liu

2012

IEEE Photon. Technol. Lett.

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“…It can be used to detect concurrent intrusions with every small resolution cell. Fixed threshold detection is adopted in Φ-OTDR initially, Fukun BI et al: Harmful Intrusion Detection Algorithm of Optical Fiber Pre-Warning System Based on Correlation of Orthogonal Polarization Signals 227 but its performance degrades dramatically in complicated application environment [7][8][9][10][11]. Furthermore, the constant false alarm rate (CFAR) methods are introduced to detect the intrusion signal of optic fiber [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Harmful intrusion detection algorithm of optical fiber pre-warning system based on correlation of orthogonal polarization signals

Feng

et al. 2017

Photonic Sens

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At present, advanced researches of optical fiber intrusion measurement are based on the constant false alarm rate (CFAR) algorithm. Although these conventional methods overcome the interference of non-stationary random signals, there are still a large number of false alarms in practical applications. This is because there is no specific study on orthogonal polarization signals of false alarm and intrusion. In order to further reduce false alarms, we analyze the correlation of optical fiber signals using birefringence of single-mode fiber. This paper proposes the harmful intrusion detection algorithm based on the correlation of two orthogonal polarization signals. The proposed method uses correlation coefficient to distinguish false alarms and intrusions, which can decrease false alarms. Experiments on real data, which are collected from the practical environment, demonstrate that the difference in correlation is a robust feature. Furthermore, the results show that the proposed algorithm can reduce the false alarms and ensure the detection performance when it is used in optical fiber pre-warning system (OFPS).

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“…In OFPS, a number of scholars have researched on the signal processing for OFPS. According to the previous study, signals can be extracted by refraction or reflection system [10][11][12][13][14]. Here, Zengguang Qin, from Ottawa University, Canada, closely studied the distribution of optical fiber vibration sensors which laid theoretical basis for the signal extraction in OFPS [14].…”

Section: Introductionmentioning

confidence: 99%

A new detection method based on CFAR and DE for OFPS

Qiu

Zheng

et al. 2016

Photonic Sens

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Optical fiber pre-warning system (OFPS) is widely utilized in pipeline transport fields. The intrusions of OFPS need to be located. In this system, the original signals consist of noises, interferences, and intrusion signals. Here, noises are background and harmless interferences possessing with high power, and the intrusion signals are the main target of detection in this system. Hence, the study stresses on extracting the intrusion signals from the total ones. The proposed method can be divided into two parts, constant false alarm rate (CFAR) and dilation and erosion (DE). The former is applied to eliminate noises, and the latter is to remove interferences. According to some researches, the feature of noise background accords with the CFAR spatial detection. Furthermore, the detection results after CFAR can be presented as a binary image of time and space. Besides, interferences are relatively disconnected. Consequently, they can be eliminated by DE which is introduced from the image processing. To sum up, this novel method is based on CFAR and DE which can eliminate noises and interferences effectively. Moreover, it performs a brilliant detection performance. A series of tests were developed in Men Tou Gou of Beijing, China, and the reliability of proposed method can be verified by these tests.

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Frequency division multiplexing OTDR with fast signal processing

Cited by 26 publications

References 21 publications

Time Division Multiplexing Optical Time Domain Reflectometry Based on Dual Frequency Probe

Time Division Multiplexing Optical Time Domain Reflectometry Based on Dual Frequency Probe

Harmful intrusion detection algorithm of optical fiber pre-warning system based on correlation of orthogonal polarization signals

A new detection method based on CFAR and DE for OFPS

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