Combined time-domain and correlation-domain Brillouin analysis with 1600 meters range and 2 centimeters resolution

被引：1
|
作者：
Elooz, David [1 ]
Antman, Yair [1 ]
Zadok, Avi [1 ]
机构：
[1] Bar Ilan Univ, Fac Engn, IL-52900 Ramat Gan, Israel
来源：
23RD INTERNATIONAL CONFERENCE ON OPTICAL FIBRE SENSORS | 2014年 / 9157卷
关键词：
Optical fiber sensors; stimulated Brillouin scattering; dynamic gratings; Brillouin correlation domain analysis; DISTRIBUTED STRAIN; SCATTERING; GRATINGS; AMPLIFICATION; FIBERS; SENSOR;
D O I：
10.1117/12.2059544
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A combined time-domain and correlation-domain Brillouin sensing scheme is demonstrated. Pump and signal waves are phase modulated by a high-rate, perfect Golomb code, which confines their interaction to discrete, 2 cm-long correlation peaks. The properties of the code substantially reduce off-peaks interactions. The pump wave is also amplitude modulated by a single pulse, so that amplifications at different correlation peaks can be separated in the time domain. The Brillouin gain spectra at all 80,000 resolution points of a 1,600 m-long fiber are reconstructed experimentally, using only 127 scans per frequency. A 3 cm-long hot spot is recognized.
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页数：4
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