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Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals

An optical fiber sensing system, quasi-distributed technology, applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of small capacity of the optical fiber sensing system and the inability to perform fault self-diagnosis, etc., and achieve the goal of improving accuracy and reliability Effect

Active Publication Date: 2014-09-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a quasi-distributed optical fiber sensing system based on spectrally limited chaotic optical signals to overcome the shortcomings of traditional optical fiber sensing systems such as small capacity and inability to perform fault self-diagnosis

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  • Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals

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Embodiment Construction

[0019] like figure 1 As shown, the light source of the sensing system in this example is provided by the ring cavity structure. Among them, the semiconductor optical amplifier 1 is used as a gain medium; the optical isolator 2 ensures the unidirectional operation of the light in the cavity, and the polarization controller 3 adjusts the polarization state in the cavity; the first fiber coupler 4 performs light splitting, and the coupling of the first fiber coupler 4 The ratio can be 50:50, 60:40, 70:30, 80:20 or 90:10. In this example, an 80:20 fiber coupler is selected, 80% of the light stays in the cavity for self-feedback amplification, and 20% of the output is used for subsequent sensing.

[0020] After the output light is amplified by the erbium-doped fiber amplifier 5, it is split by the second fiber coupler 6 with a ratio of 99:1; 1% of it is used as reference light, and 99% is used as probe light. The reference optical signal is converted into an electrical signal by ...

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Abstract

The invention relates to a quasi-distributed optical fiber sensing system and provides a quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals for the first time. The quasi-distributed optical fiber sensing system is large in capacity, high in precision and automatic in fault detection. According to the system, the sensing system is expanded to the maximum degree through wavelength division multiplexing and time division multiplexing; meanwhile, conversion into power change is achieved through grating wavelength shift, and the detection precision is improved; in addition, based on the feature of the chaos optical signals, the sensing system has the accurate locating function, and the reliability of the system is greatly improved due to application to automatic breakpoint fault detection.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a quasi-distributed optical fiber sensing system based on spectrum-limited chaotic optical signals. Background technique [0002] Optical fiber sensing system is an important field of engineering research of optical fiber sensing technology. Using optical fiber as the transmission medium, a large-scale access to optical fiber sensing units is achieved through various sensing multiplexing technologies to achieve large-capacity, high-precision, and long-distance sensing. Due to the unique advantages of optical fiber, such as small size, light weight, high safety, anti-electromagnetic interference, and corrosion resistance, compared with traditional sensing systems, optical fiber sensing systems are more widely used in power grid detection, marine exploration and other fields. At present, the optical fiber sensing system is facing the challenges of improving the sensing accurac...

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Application Information

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IPC IPC(8): G01D5/26
Inventor 夏历罗亦杨黄笛孙琪真刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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