A method for suppressing backscattered noise in the middle section of an optical fiber ring
A technology of backscattering and fiber optic ring, which is applied in the field of suppressing the backscattering noise in the middle section of the fiber optic ring in the fiber optic gyroscope. The effect of eliminating non-reciprocity errors
Active Publication Date: 2016-01-20
CHONGQING HUAYU ELECTRIC GRP
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[0003] In the fiber optic gyroscope, the fiber optic ring is made of hundreds of thousands of meters of optical fiber. Due to the imperfection of the material and manufacturing process of the fiber itself, there is backscattering when the light wave is transmitted in the fiber optic ring. Or there may be interference between the backscattered wave and the main wave of the signal, and these interference light intensities will inevitably be superimposed on the Sagnac light intensity (Sagnac), that is, the signal light intensity, which brings great difficulties to signal detection. Non-reciprocity errors, which greatly affect the accuracy of fiber optic gyroscopes
The emergence and adoption of wide-spectrum SLD light sources have greatly reduced the backscatter noise and other optical noise in the fiber ring. However, this method cannot eliminate the noise caused by the backscattering of the coherence length at the midpoint of the fiber ring (the middle section of the fiber ring). of
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[0016] Example: see figure 1 , a method to suppress the backscatter noise in the middle section of the fiber ring, using the Y waveguide to convert the signal amplitude to The input light wave is divided into the signal amplitude value of and the signal amplitude value is The two output light waves of , the two tail fibers of the Y waveguide are connected with the two ends of the fiber ring, so that the signal amplitude is and The output light waves go around the optical fiber ring clockwise and counterclockwise respectively and then return to the Y waveguide;
[0017] A signal phase modulator is arranged between a pigtail of the Y waveguide and the fiber ring, and the signal amplitude output from the pigtail is The output light wave is phase-modulated by the signal phase modulator and then enters the fiber ring, and returns to the Y waveguide after going around the fiber ring for a circle. The signal amplitude output from the other pigtail is The output light wave...
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The present invention disclosed a method of inhibiting the back of the loose noise in the middle of the optical fiber ring. Using Y waveguard to make the signal amplitude value?IntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionIntersectionThe input optical waves are divided into two beam output light waves with the signal amplitude value and the signal amplitude value. There is a signal phase modulation between the tail fiber and the fiber ring of the Y wave guide to adjust the signal phase modulationThe square wave modulation signal generated by the phase modulator meets the conditions:; and:.The present invention can effectively reduce or eliminate non -ease errors (noise) caused by the back of the middle section of the fiber ring, thereby further improving the accuracy of the fiber gyroscope.
Description
technical field [0001] The invention relates to the technical field of fiber optic gyroscopes, in particular to a method for suppressing backscattering noise in the middle section of an optical fiber ring in the fiber optic gyroscope. Background technique [0002] Fiber optic gyroscopes are widely used in various technical fields due to their advantages of all solid state, no moving parts, high reliability, fast response, flexible structure, high potential precision, wide measurement range, and long service life. [0003] In the fiber optic gyroscope, the fiber optic ring is made of hundreds of thousands of meters of optical fiber. Due to the imperfection of the material and manufacturing process of the fiber itself, there is backscattering when the light wave is transmitted in the fiber optic ring. Or there may be interference between the backscattered wave and the main wave of the signal, and these interference light intensities will inevitably be superimposed on the Sagna...
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IPC IPC(8): G01C19/72
Inventor 李光辉刘言易发挥颜丽华
Owner CHONGQING HUAYU ELECTRIC GRP