Mr. Chen Liu Profile

Chen Liu

at Shanghai Univ

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Proceedings Article | 30 November 2012 Paper

Discrete multi-target on-off states detection and location with optical fiber sensing system

Nian Fang, Lutang Wang, Zhaoming Huang, Chen Liu

Proceedings Volume 8561, 85611F (2012) https://doi.org/10.1117/12.999985

KEYWORDS: Sensing systems, Sensors, Optical fibers, Target detection, Reflectivity, Optical switching, Optical testing, Fluorescence correlation spectroscopy, Light sources, Oscilloscopes

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We present an optical fiber sensing system for discrete multi-target’s on-off states detection and location. The sensing system consists of multiple cascaded 1x2 fiber couplers (FCs). Each FC is connected to a reflective optical switch sensor (ROSS). A ROSS is corresponding to a target to be detected. The system can remotely detect the on-off states of multiple ROSSs, as well as accurately and rapidly locate the ROSSs in alarm states. By detecting the various intensities of light pulses reflected by each ROSS, their on-off states can be monitored. The ROSSs in alarm states can be located by directly measuring the reflected light pulse intensity at corresponding time axis or the declined peaks of short-time crosscorrelation of reflection pulse train during adjacent optical pulse period in noisy case. The simulation results with the same and different ROSS intervals show that the detection and location methods proposed are feasible and effective. The system can be used to detect and locate different kinds of physical and chemical targets discretely distributed at the same time, which can prompt state changes of the ROSSs. Although the proposed system is similar to the optical time domain reflectometry (OTDR) in structure, it has better real time performance and lower cost than OTDR.

Proceedings Article | 29 November 2012 Paper

Chen Liu, Nian Fang, Lutang Wang, Zhaoming Huang

Proceedings Volume 8554, 85540L (2012) https://doi.org/10.1117/12.999986

KEYWORDS: Chaos, Optical fibers, Birefringence, Semiconductor lasers, Fiber lasers, Polarization, Semiconductors, Laser applications, Nonlinear optics, Scanning probe microscopy

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Similarity of adjacent-frame chaos waveforms from a semiconductor fiber ring laser (SFRL) is investigated numerically in sensing applications. An improved model of a chaos optical fiber fence system based on a SFRL is presented. The optical fiber’s SPM/XPM effects are considered. By this model adjacent-frame similarity’s determinants are studied by comparing their cross-correlation function peaks at different parameters. The relationships between the similarity and the optical fiber’s distributed linear birefringence effect, as well as SPM/XPM effects induced by the nonlinear birefringence are revealed by setting only one effect to work respectively. The characteristics of the chaos waveform with high similarity are researched by the autocorrelation function and power spectrum. The simulation results show that the similarity is more sensitive to the change of azimuth angle than that of the retardation angle of the polarization controller in the ring laser. It has almost no change with the ring length and injection current of semiconductor optical amplifier (SOA). The optical fiber’s distributed linear birefringence and SPM/XPM effects mainly contribute to the formation of polarization chaos light however slightly decrease the similarity. The influence of nonlinear birefringence becomes big and decreases obviously the similarity only at an overlarge SOA current. The chaos waveforms with high similarity have big autocorrelation sub-peaks and the sub-peaks decrease slowly and gradually. Their power spectrums are mixed up with some periodic components. These results are helpful to choose the SFRL’s parameters for the accurate disturbance location in a chaos optical fiber fence system.

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