Chromatic dispersion measurements are usually made with tunable fiber Raman sources or a set of anywhere from five to seven laser diodes. Measurements cover a wide wavelength range, and equations for various fiber designs are fit to the data.1 For practical system use, however, the interest is around the zero dispersion wavelength region. Kapron has shown, within ±30 nm of λ0, the linear approximation D(λ) = S0(λ−λ0) is within 4% of more accurate fits2 . D is the dispersion (ps/nm • km), S0 is the dispersion slope, and λ0 is the minimum dispersion wavelength. This paper describes a single-laser diode technique capable of determining dispersion at the operating system wavelength with a resolution of ~0.1 ps/nm • km.
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