In order to eliminate the noise in the polarization mode dispersion(PMD)measurement system by the fixed analyzer method and improve the measurement accuracy, this paper applies singualr value decomposition(SVD) denoising algorithm to polarization mode dispersion measurement scheme. First, construct Hankel matrix in term of a discrete signal sequence, and it was decomposed into a number of matrixes by singular value. Second, divide singular values into two groups: valid group and noise group and fit the valid signal characteristic curve and the noise characteristic curve. Then, calculate the fitting error, and define the minimal order of fitting error as valid order. Finally, reconstruct the signal. The experiments compare results based on the SVD filtering method, Butterworth filtering method and commercial instruments. The results show that this method is suitable in different types and lengths of fiber. The measurement accuracy was improved obviously.
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