Abstract
We propose a novel technique to measure fiber dispersion without any derivative operation and index measurement. Based on the relationship between the dispersion and the signal in optical computing optical coherence tomography, dispersion can be deduced with high accuracy from optical computing OCT signal position and resolution. The group velocity dispersion and third order dispersion of single mode fiber and dispersion compensating fiber with lengths of 10 m–10 km are measured to be in good consistence with the nominal value.
Highlights
Dispersion parameter of fiber is quite important in the fiber industry
We develop a new method based on OC2T to measure dispersion for the first time
Our method provides a low-cost and simple dispersion measurement method with relatively high accuracy
Summary
Dispersion parameter of fiber is quite important in the fiber industry. There are many methods to measure the dispersion. Method of fingerprintspectral wavelength-to-time mapping can measure the dispersion with high accuracy, but it employs mode-locked fiber laser as the light source, which is costly [8], and has a fiber length limit of 0.5–100 km. Another method using transfer function [9] is developed to indirectly measure only the third order dispersion via a sequence of iterations and needs a double-sideband suppressed carrier, variable optical delay line, optical spectrum processor and network analyzer to measure the dispersion, which is quite cumbersome, high-cost and time-consuming. What is really concerned is the general dispersion properties of media such as long-distance optical fibers over a wide wavelength range
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