Scientists demonstrate advanced low-coherence BOCDR system using periodic pseudo-random modulation

Phys.org  October 1, 2024
Brillouin optical correlation-domain reflectometry (BOCDR) is a technique for measuring the distribution of strain and temperature along an optical fiber. However, it faces a trade-off between spatial resolution and measurement range. Researchers in Japan proposed low-coherence BOCDR based on periodic pseudo-random modulation to address this issue and demonstrated its proof-of-concept operation. First, the dependence of the light source output spectrum on modulation parameters was investigated showing the potential to resolve the trade-off between spatial resolution and measurement range. They also demonstrated the capability of measuring strain distribution along optical fibers without a variable delay line under multiple conditions. Through simulation they showed that their method could perform more accurate distributed strain measurements than standard BOCDR… read more. Open Access TECHNICAL ARTICLE