Measurement method of the relative propagation delay of two signals based on modified caliper ruler.

A novel measurement technique for the relative propagation delay of two signals based on a caliper ruler is proposed. The technique is applied to the chromatic dispersion measurements of single-mode fiber (SMF), dispersion-compensation fiber, and dispersion-shifted fiber. Compared to the conventional time-of-flight method, dispersion can be measured even when the delay difference is smaller than the measurement pulse's width.