Multi-wavelength Brillouin optical time domain analyzer

A technology of optical time domain analyzer and multi-wavelength laser, which is applied in the direction of instruments, measuring devices, special recording/indicating devices, etc., can solve the problems of increased measurement time and the improvement of system signal-to-noise ratio, and achieve the improvement of measurement efficiency, The effect of improving the sensing range and shortening the measurement time

Inactive Publication Date: 2013-05-22
NANJING UNIVERSTIY SUZHOU HIGH TECH INST +1
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Problems solved by technology

However, due to the limitation of nonlinear effects in the optical fiber, the optical power incident on the optical fiber under test should be lower than the stimulated Brillouin threshold; in addition, increasing the number of averages will not only increase the measurement tim

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Embodiment

[0045] Embodiment: The measurement method of the present invention is illustrated in conjunction with specific measurement methods and accompanying drawings. This embodiment uses three wavelengths, but the present invention is not limited to three wavelengths.

[0046] like image 3 As shown, the single-wavelength laser emits 1549.886nm single-wavelength laser light, which is modulated by the electro-optic modulator 1 and the microwave source 1 to generate three-wavelength laser light sources with a wavelength interval of 0.028nm and a corresponding frequency interval Δυ of 3.5GHz. Afterwards, it is divided into two paths by the coupler, and one path is modulated into a 50ns optical pulse by the electro-optic modulator 2 and the pulse generator, and then amplified by the erbium-doped fiber amplifier 1, and enters port 1 of the circulator 1 as the detection pulse light, from the 2 The port is injected with a 23.6km-long optical fiber to be tested, and about 45m of the end of t...

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Abstract

The invention discloses a multi-wavelength Brillouin optical time domain analyzer which comprises a multi-wavelength laser device, a coupler, a probe pulse optical path, a continuous pump light path, a detector and a signal acquisition processor, wherein the probe pulse optical path comprises a probe pulse light modulation unit, a first erbium-doped optical fiber amplifier and a first circulator, and the continuous pump light path comprises a continuous pump light modulation unit, a second erbium-doped optical fiber amplifier, a second circulator, a Bragg grating and a polarization scrambler. The multi-wavelength laser device emits continuous light, and the continuous light is respectively input to the probe pulse optical path and the continuous pump light path through the coupler. By means of increase of the number of the wavelength of probe light and pump light, the multi-wavelength Brillouin optical time domain analyzer can increase the total luminous power of the entered optic fiber in the premise that stimulated Brillouin scattering is not caused and effectively improve the signal to noise ratio of a system. Meanwhile, the measuring efficiency is enabled to be improved, the measuring time is shortened for a certain sensing distance, and the sensing range is improved for a certain measuring time.

Description

technical field [0001] The invention relates to a Brillouin optical time domain analyzer based on a multi-wavelength light source, which is used for the Brillouin optical time domain analyzer in the fields of optical fiber sensing and optical cable health monitoring. Background technique [0002] The fully distributed optical fiber sensing technology uses the entire optical fiber as the sensing element, and utilizes the scattering phenomenon in the optical fiber to realize the continuous distribution measurement of the physical quantity to be measured (strain, temperature, etc.) on the sensing optical fiber as a function of time and space. BOTDA (Brillouin optical time-domain analysis, Brillouin optical time-domain analysis instrument) is a distributed optical fiber sensing system based on the stimulated Brillouin amplification effect, because the Brillouin optical time-domain analysis instrument has a sensing distance Long, high sensitivity, high measurement accuracy and ot...

Claims

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Application Information

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IPC IPC(8): G01D3/036
Inventor 路元刚张旭苹王雪李存磊
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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