Fundamental experiment of ranging using chaotically modulated laser diode

摘要

We proposed a new laser ranging technique using the correlation of chaotic modulation in the previous paper. In this paper we have described the preliminary experiment for ranging using a chaotically modulated laser diode. Chaotic signal was produced by R, L and diode circuit. A visible laser diode was modulated by this signal. Chaotically modulated laser was divided by a beam splitter. One beam was directly detected and the other one was detected via an optical fiber having effective length of 50 m. We can measure the delay of beam by taking the correlation of two detected signals. When the modulation of signal was 2 MHz, error in the round-trip path length was 0.6 m in one measurement.