Effects of dispersion on nonlinearity measurement of optical fibers

We analyze the effects of dispersion in the determination of nonlinearity of optical fiber by combining the method of continuous-wave self-phase modulation with numerical simulations. The relevance of the measurement results is studied as a function of the wavelength difference of the dual-frequency beat signal and the fiber length. It is observed that dispersion can have a significant impact on the nonlinearity measurements. We propose a means to take the effects of dispersion into account.