Abstract
Brillouin optical time-domain analysis requires a pulsed pump to obtain a distributed Brillouin gain spectrum (BGS) containing environmental information, whose width corresponds to spatial resolution (SR). We propose a rising edge demodulation (RED) algorithm acting on Brillouin information generated by a transient pump pulse (< phonon lifetime) via a nonlinear weight matrix to enhance SR. The distributed BGS generated by using an 8-ns transient pump pulse is processed by the RED algorithm, and its SR is enhanced from 0.8 m to 1 mm (i.e., 800-fold improvement) in the simulation and 8 mm (i.e., 100-fold improvement) in the experiment.
| Original language | English |
|---|---|
| Pages (from-to) | 3440-3443 |
| Number of pages | 4 |
| Journal | Optics Letters |
| Volume | 46 |
| Issue number | 14 |
| DOIs | |
| State | Published - 15 Jul 2021 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2021 Optical Society of America
Funding
Funding. Heilongjiang Postdoctoral Fund to pursue scientific research in Heilongjiang Province (LBH-Z20067); China National Postdoctoral Program for Innovative Talents (BX20200104); Natural Science Foundation of Heilongjiang Province (LH2020F014); National Natural Science Foundation of China (61975045, 62005067); National Key Scientific Instrument and Equipment Development Projects of China (2017YFF0108700).
| Funders | Funder number |
|---|---|
| Heilongjiang Province | LBH-Z20067 |
| National Natural Science Foundation of China | 61975045, 62005067 |
| Natural Science Foundation of Heilongjiang Province | LH2020F014 |
| National Key Scientific Instrument and Equipment Development Projects of China | 2017YFF0108700 |
| National Postdoctoral Program for Innovative Talents | BX20200104 |