Patent ID: 9602199
Date: 2017-03-21
CPC Classifications: H04B

Claim:
1. A method of measuring optical fiber link chromatic dispersion by fractional Fourier transformation (FRFT), comprising: step one, performing coherent demodulation for an optical signal propagating through an optical fiber link to obtain a real part E step two: performing FRFT for the complex field of the optical pulse signal obtained in the step 1, according to the energy focusing effect of the fractional spectrum of the chirp signal, searching for an optimal fractional order ρ step three: calculating chirps of the optical pulse signal according to the optimal fractional order ρ where S is a scale factor in the FRFT, and the value thereof is S=√N, N the number of samples of a signal; and step four: calculating chromatic dispersion of the optical fiber link as wherein is λ 0 the central wavelength of the optical pulse signal.