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Sensing optical fiber

A technology of sensing optical fiber and single-mode optical fiber, which is applied in the direction of cladding optical fiber, optical waveguide and light guide, etc., can solve the problems of poor system accuracy and timeliness, weakening of physical quantities, and affecting optical fiber sensitivity, etc., to improve the monitoring distance and reduce the weight , Conducive to the effect of outdoor laying

Inactive Publication Date: 2008-01-09
TONGDING INTERCONNECTION INFORMATION CO LTD
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Problems solved by technology

However, since the cable core of ordinary communication optical fiber or optical cable is usually waterproofed with oil-filled optical fiber loose tube, since the oil ointment has a weakening effect on the physical quantity of the space physical field, it will affect the detection sensitivity of the optical fiber, resulting in the entire The accuracy and timeliness of the system is poor

Method used

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  • Sensing optical fiber

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Embodiment Construction

[0015] Referring to the accompanying drawings, a sensing optical fiber includes a core 1, a bonding layer 2, a foam buffer layer 3, and an outer sheath 4 arranged sequentially from the inside to the outside, and the core 1 is single-mode optical fiber.

[0016] Among them, the fiber attenuation of core 1 is at 1310nm, and the maximum attenuation coefficient on the wavelength is: average ≤ 0.35dB / km; the maximum attenuation coefficient on the wavelength of 1550nm is: average ≤ 0.22dB / km; fiber attenuation unevenness: Δ ≤0.05dB / km. Mode field diameter of core 1: 9.3±0.5um; fiber cladding diameter: 125±2um; mode field concentricity error: ≤1um; cladding out-of-roundness<2%; dispersion coefficient 1288-1399nm≤3.6ps / nm .km, 1271-1360nm≤5.3ps / nm.km, 1550nm≤18ps / nm.km.

[0017] The adhesive layer 2 is a thermosol synthesized by a polymer material, and its thickness should be greater than 0.05 mm. Usually, the thermosol is made of high-concentration ethylene-vinyl acetate copolymer ...

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Abstract

The invention is a sensing optical fiber, comprising fiber core, bonding layer, foamed buffering layer and outer protective layer arranged in turn from the inside outward, where the fiber core is a single-mode optical fiber; the bonding layer is of hot melt glue; the foamed buffering layer is of polyolefin material; the outer protective layer is of hard plastic or metal. As compared with the existing technique, it has advantages of high sensitivity, locating accuracy, fast response, lightweight, long service life, etc.

Description

technical field [0001] The invention relates to a sensing optical fiber used in a sensing positioning system. Background technique [0002] As a new member of the sensor family, fiber optic sensors can affect the intensity, phase, polarization, and frequency of light transmitted by optical fibers according to physical quantities such as vibration, pressure, temperature, and radiation of space physics. The optical fiber sensing system monitors, processes and analyzes these events, and achieves real-time monitoring based on the system's monitoring and response time to events. For example, the application of this optical fiber sensing system in the railway communication system can enable the staff to monitor the railway communication facilities in time and effectively reduce theft. [0003] Sensing optical fiber has the advantages of light weight, thin diameter, strong resistance to electromagnetic interference, corrosion resistance, high temperature resistance, small signal a...

Claims

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Application Information

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IPC IPC(8): G02B6/02
Inventor 杨淑芳张建华高嘉瑞李海张大伟李刚
Owner TONGDING INTERCONNECTION INFORMATION CO LTD
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