Low-Coherence Brillouin Optical Correlation- Domain Reflectometry Based on Periodic Pseudo-Random Modulation

• DOI: 10.1109/jlt.2024.3436928
• Publication Date: 2024-08-02T17:30:19Z
• Authors: Kenta Otsubo; Guangtao Zhu; Kohei Noda; Takaki Kiyozumi; Hiroshi Takahashi; Yusuke Koshikiya; Yosuke Mizuno
• Keywords: Reflectometry; Modulation (music); Brillouin zone; Optical time-domain reflectometer

Brillouin optical correlation-domain reflectometry (BOCDR) is a technique for measuring the distribution of strain and temperature along an fiber, offering advantages such as operation with light injection from one end sensing relatively high spatial resolution, random-access capability to points. However, it faces trade-off between resolution measurement range. In response, low-coherence BOCDR using randomly modulated source has been proposed, but this method requires variable delay line scanning position, limiting This paper proposes based on periodic pseudo-random modulation address issue demonstrates its proof-of-concept operation. First, dependence output spectrum parameters investigated delayed self-homodyne method, showing potential resolve Subsequently, we demonstrate fibers without under multiple conditions. Further, show through simulation that can perform more accurate distributed measurements than standard BOCDR.