BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof

An optical time domain reflectometry and reference light technology, applied in the field of reflectometers, can solve problems such as inability to ensure accurate measurement of strain and temperature, and a large difference in reference optical power, and achieve reduced implementation costs, low costs, and high signal-to-noise ratio. Effect
CN101839698AInactive Publication Date: 2010-09-22NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV
Publication Date
2010-09-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and a calibrating method thereof. The calibrating method comprises the following steps of: acquiring an electric signal of local reference light from a heterodyne photoreceiver on a basis of a traditional BOTDR for heterodyne coherent detection; transmitting the electric signal subjected to analog-to-digital conversion in a computer to be used as the optical power calibrating feedback quantity of the reference light; sending out an instruction by the computer to adjust the output power of a microwave source and change the optical power of the local reference light so that the difference between the optical power of the local reference light and the preset reference light power is smaller than a set value; calibrating the power; and detecting a BOTD signal. In the invention, the BOTDR in a working process can not be influenced by the working environment temperature, a microwave transmission line connecting the microwave source with an electro-optic modulator and different power responses of the electro-optic modulator on microwave signals of different frequencies, the error between the reference light power at different frequency points and the preset power is smaller than a set value, and the accurate measurement of the stress and the temperature is ensured.
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Description

technical field

[0001] The invention relates to a Brillouin optical time domain reflectometer for fully distributed measurement of the strain and temperature of an optical fiber, which can calibrate the optical power of reference light at different frequency points in the Brillouin optical time domain reflectometer, so as to To ensure accurate measurement of strain and temperature, it is a reference light optical power calibration method of Brillouin optical time domain reflectometer and reflectometer. Background technique

[0002] Brillouin optical fiber time domain reflectometry (BOTDR) is a fully distributed optical fiber sensing system based on Brillouin scattering. The system transmits pulses from one end of the optical fiber, and at the same time detects the Brillouin scattering signal at the transmitting end. The product of the time delay between sending the pulse and receiving the scattering signal and the speed of light can provide the position information of the op...

Claims

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