Abstract
To simplify the experimental equipment and improve the signal-to-noise ratio (SNR) of the traditional Brillouin optical time-domain analysis (BOTDA) system, we propose a scheme using the frequency-agile technique to measure Brillouin gain and loss spectra simultaneously. The pump wave is modulated into the double-sideband frequency-agile pump pulse train (DSFA-PPT), and the continuous probe wave is up-shifted by a fixed frequency value. With the frequency-scanning of DSFA-PPT, pump pulses at the −1st-order sideband and the +1st-order sideband interact with the continuous probe wave via stimulated Brillouin scattering, respectively. Therefore, the Brillouin loss and gain spectra are generated simultaneously in one frequency-agile cycle. Their difference relates to a synthetic Brillouin spectrum with a 3.65-dB SNR improvement for a 20-ns pump pulse. This work simplifies the experimental device, and no optical filter is needed. Static and dynamic measurements are performed in the experiment.
| Original language | English |
|---|---|
| Pages (from-to) | 3151-3154 |
| Number of pages | 4 |
| Journal | Optics Letters |
| Volume | 48 |
| Issue number | 12 |
| DOIs | |
| State | Published - 15 Jun 2023 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2023 Optica Publishing Group.
Funding
Funding. National Natural Science Foundation of China (62005067); China Postdoctoral Science Foundation (2020M681088, BX20200104); Heilongjiang Provincial Postdoctoral Science Foundation (LBH-Z20067).
| Funders | Funder number |
|---|---|
| National Natural Science Foundation of China | 62005067 |
| China Postdoctoral Science Foundation | 2020M681088, BX20200104 |
| Heilongjiang Provincial Postdoctoral Science Foundation | LBH-Z20067 |