Brillouin optical correlation domain analysis based on intensity modulation
•The signals employ pulse trains arranged at power intervals.•Obtained Brillouin spectra forms a comb-like shape.•The signals are generated and time gated by using a single intensity modulator.•The net gain can be enhanced to conventional signal formula.•Increasing the measurement distance does not...
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Veröffentlicht in: | Optical fiber technology 2021-10, Vol.66, p.102656, Article 102656 |
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Sprache: | eng |
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Zusammenfassung: | •The signals employ pulse trains arranged at power intervals.•Obtained Brillouin spectra forms a comb-like shape.•The signals are generated and time gated by using a single intensity modulator.•The net gain can be enhanced to conventional signal formula.•Increasing the measurement distance does not increase the uncorrelation gain.
We present a signal formula for correlation domain Brillouin analysis that uses short pulse trains arranged at different power intervals. The proposed signal can be realized by using only an intensity modulator, and the signal period (the measurement range) and the signal length can be independently realized without using an additional modulator for time gating. In the numerical analysis, we show that the proposed scheme obtains a gain advantage over the conventional scheme for fibers under test of approximately a few hundred meters when the available pump average power is limited. In the experiment, it was demonstrated that Brillouin frequency shifts can be discriminated with a spatial resolution of 5 cm over a 95-m-long fiber. |
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ISSN: | 1068-5200 1095-9912 |
DOI: | 10.1016/j.yofte.2021.102656 |