Abstract
We propose a technique to modulate the pump light of phase-shift pulse Brillouin optical time domain analysis (PSP-BOTDA) with Walsh code in a nested configuration. We call it dual Walsh codes PSP-BOTDA. In this technique, two Walsh codes are each assigned to return-to-zero (RZ) and non-return-to-zero (NRZ) pulses. Simulation and experiment results have shown that the assignment of Walsh to the non-return-to-zero (NRZ) pulses even for code duration of longer than the time constant of the acoustic wave still attains the theoretical spatial resolution of the Brillouin signal, in contrast to that of previously proposed dual Golay codes PSP-BOTDA. In terms of the optical signal-to-noise ratio (SNR), we obtained a maximum of improvement of 5.4 dB, compared to the conventional technique.
Original language | English |
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Title of host publication | 2016 IEEE 6th International Conference on Photonics, ICP 2016 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
ISBN (Electronic) | 9781467381536 |
DOIs | |
Publication status | Published - 2016 Jul 12 |
Event | 6th IEEE International Conference on Photonics, ICP 2016 - Kuching, Sarawak, Malaysia Duration: 2016 Mar 14 → 2016 Mar 17 |
Other
Other | 6th IEEE International Conference on Photonics, ICP 2016 |
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Country | Malaysia |
City | Kuching, Sarawak |
Period | 16/3/14 → 16/3/17 |
Keywords
- BOTDA
- distributed fiber sensor
- stimulated Brillouin scattering
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Computer Networks and Communications