Method for improving signal to noise ratio of BOTDA system based on combined pulse code
A technology that combines pulse and signal-to-noise ratio, applied in the direction of converting sensor output, measuring device, instrument, etc., can solve the problem of limited improvement of signal-to-noise ratio and inability to meet the requirements of high signal-to-noise ratio of the system.
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[0061] The TSL-510 tunable laser from Santec Company is selected as the carrier light source. The wavelength range of the laser is 1510nm-1630nm, and the set wavelength is 1550nm; both modulator 1 and modulator 2 are MXAN-LN-40 from Photline Company, and the bandwidth is 32GHz ; The DC bias voltage is 9V; the amplifier is an erbium-doped fiber amplifier from ZTE Corporation, the wavelength range is 1530-1565nm, and the amplification factor is greater than 35 times; the microwave signal source is 8257D from Agilent; the pulse pattern signal generator from Agilent , the model is 81134A, the frequency range is 15MHz~3.35GHz; the photoelectric detector is SD-48 of Tektronix, the bandwidth is 35GHz; the sensing fiber is the fiber of YOFC Optical Fiber and Cable Co., Ltd., and the stimulated Brillouin gain linewidth is 40MHz, Brillouin frequency shift, the length is 300 meters; the isolation degree of the optical isolator is greater than 40dB; the data acquisition card is PCI-5114 da...
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