Patent ID: 8971703
Filing Date: 2015-03-03
Classification: G01M,H04B

Abstract:
1. A wavelength dispersion amount estimation method to estimate a dispersion compensation amount for compensating waveform distortion due to wavelength dispersion at an optical fiber transmission path, comprising: an initial value setting step to set a dispersion compensation amount D(0) which is an initial value (k=0) of a kth dispersion compensation amount D(k) (k is an integer); a clock detecting step to detect and store strength of a symbol arrival timing clock included in received data at the dispersion compensation amount D(k) as a clock detection value S(k); a plus side shifting step to detect and store strength of the symbol arrival timing clock at a dispersion compensation amount D(k)+ΔD/M a minus side shifting step to detect and store strength of the symbol arrival timing clock at a dispersion compensation amount D(k)−ΔD/M a comparing step to compare the clock detection value S(k), the clock detection value S(k+), and the clock detection value S(k−); and an evaluating step to determine to complete estimation of the dispersion compensation amount as determining the dispersion compensation amount D(k) as an optimum dispersion compensation amount when the clock detection value S(k) is the largest, and to perform once again the clock detecting step, the plus side shifting step, the minus side shifting step, and the comparing step with the dispersion compensation amount of the largest clock detection value set as a k+1th dispersion compensation amount D(k+1) when the clock detection value S(k+) or the clock detection value S(k−) is the largest, as a result of the comparing step.