Time/frequency coding for Brillouin distributed sensors

In this paper, we propose a novel coding for long range Brillouin Optical Time Analysis (BOTDA) distributed sensors based on a combination of time and frequency pulses, resulting in an additional coding gain of √2 with respect to traditional intensity-modulated codes. The generation of frequency-chirped pseudo-arbitrary pulses in return-to-zero (RZ) format with a Direct-Digital Synthesizer (DDS) is presented and the coding gain is experimentally verified, perfectly matching its theoretical value.


Published in:
Proc. SPIE 8421
Presented at:
OFS2012 22nd International Conference on Optical Fiber Sensors, Beijing, China, 15-19 October 2012
Year:
2012
Laboratories:




 Record created 2012-12-13, last modified 2018-09-13

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