Coupling Intensity Measurement Based on White Light Interferometry in the Distributed Long PMF Sensors

Zhang, Hongxia; Ye, Wenting; Chen, Xinwei; Jia, Dagong; Zhang, Yimo

doi:10.1109/jsen.2012.2204977

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…(8) and Eq. (10) are also applicable as references in other LCI systems, for example, optical coherence tomography (OCT), where peak splitting phenomenon is also probable to happen [11]. Experimental results show that the distance of two close coupling points can be accurately measured with errors less than 5% and the spatial resolution is seriously enhanced by 13-fold and 20-fold for PMF of 600 m and 950 m, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…At the exit of the system, the interference fringes are read out by a photo-detector during the scanning, and then transmitted to the computer through a data acquisition card (NI USB-6251). Because the coherence envelope is related to the source emission spectrum by a Fourier transform [11], the coherence envelope has the same Gaussian shape as the light source. If we neglect the background and normalize the intensity, the interference fringes can be seen as the envelope superimposed by a cosine term [15] 2 0…”

Section: Peak Splitting In Dpc Detectionmentioning

confidence: 99%

“…In fact, on condition that two coherence envelopes are close to each other as the right graph shown in Fig.1, beat effect will happen in the mutual overlapping region of the two envelopes [11]. Assume that the two close coupling points with almost the same intensity are deployed in a PMF, the distance of one point from the fiber end is l , the other is  ll , where …”

Section: Peak Splitting In Dpc Detectionmentioning

confidence: 99%

“…The first is to match the dispersion by placing the right amount of dispersion balancing material in one interferometer arm of the LCI setup [6], [7]. The other one is numerical compensation with complicated data postprocessing techniques [8]- [11]. However, both of these two kinds of methods require a priori knowledge of extant dispersive properties.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, two close coherence envelopes will split into multiple peaks if the dispersion is not compensated for [12]- [14]. Hitzenberger et al [11] demonstrates the phenomenon of peak splitting. However, little attention has been paid to further research on it.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Resolution Enhancement Based on Peak Splitting in Low-Coherence Interferometry Signal

et al. 2016

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Low coherence interferometry (LCI) has been a useful tool to detect distributed polarization coupling (DPC) points in polarization maintaining fiber (PMF). However, due to birefringence dispersion, two close coupling points in long PMF are usually difficult to be distinguished. A novel method in our paper has been presented to tackle the problem. When the product of birefringence dispersion and fiber length called accumulated dispersion (AD) is numerically enough, the coherence envelopes caused by two close coupling points will split into periodic multiple peaks in the overlapping region and the distance of the two coupling points can be further demodulated from the frequency of splitting peaks. An experimental setup based on LCI has been established with two Panda PMFs of 600m and 950m under test. Experimental results show that the measuring errors of two close coupling points distance were less than 5%. When AD reached as high as 29 fs/nm and 46 fs/nm, the spatial resolution was increased by 13-fold and 20-fold, respectively. The constraint conditions to ensure the appearance of peak splitting is also discussed. It indicates that our method may show a potential application of spatial resolution enhancement in high-dispersive LCI without dispersion compensation.

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Section: Resultsmentioning

confidence: 99%

Section: Peak Splitting In Dpc Detectionmentioning

confidence: 99%

Section: Peak Splitting In Dpc Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial Resolution Enhancement Based on Peak Splitting in Low-Coherence Interferometry Signal

et al. 2016

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Frequency Demodulation of Dynamic Stress Based on Distributed Polarization Coupling System

Zhang

Wang

Wen

et al. 2018

J. Lightwave Technol.

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Automatic Interference Term Retrieval From Spectral Domain Low-Coherence Interferometry Using the EEMD-EMD-Based Method

et al. 2016

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Low-coherence interferometry (LCI) has proved to be a useful tool in optical measurement and detection. However, the noise that is present in practical applications makes interference term retrieval (ITR) difficult. In this paper, we propose a novel technique based on ensemble empirical mode decomposition and empirical mode decomposition (EEMD-EMD) to achieve automatic ITR from the spectral domain LCI. In EEMD, the correlation coefficient of each intrinsic mode function (IMF) is calculated, and a characteristic parameter (CP) is introduced to recognize and remove the IMFs of noisy components. The remaining IMFs are used to reconstruct a new signal followed by EMD to extract the interference term. An experiment based on distributed polarization coupling detection in polarization-maintaining fibers (PMFs) was conducted; the PMFs having different lengths and coupling intensities were investigated. It was shown that by setting an appropriate CP, the interference term could be automatically extracted. The relative errors of the extracted coupling intensity were less than 2%. This suggests that our method may have potential applications in interferometric measurement.

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Coupling Intensity Measurement Based on White Light Interferometry in the Distributed Long PMF Sensors

Cited by 7 publications

References 13 publications

Spatial Resolution Enhancement Based on Peak Splitting in Low-Coherence Interferometry Signal

Spatial Resolution Enhancement Based on Peak Splitting in Low-Coherence Interferometry Signal

Frequency Demodulation of Dynamic Stress Based on Distributed Polarization Coupling System

Automatic Interference Term Retrieval From Spectral Domain Low-Coherence Interferometry Using the EEMD-EMD-Based Method

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