Simultaneous measurement of the dispersion and nonlinearity of standard fibre using frequency resolved optical gating

Using the measurement technique of frequency resolved optical gating, we have simultaneously determined the nonlinear refractive index (n₂) and group velocity dispersion of Coming SMF-28 fibre over the wavelength range 1534-1560 nm. In this paper we present a novel and convenient measurement technique which allows the simultaneous measurement of the nonlinear refractive index n, and the group velocity dispersion (GVD) of a short length of single mode fibre. We use frequency resolved optical gating (FROG) to completely characterise the intensity and phase of an optical pulse before and after propagation in a length of fibre where the pulse evolves under the combined effects of self phase modulation (SPM) and GVD