We report a phase-coded Brillouin optical correlation-domain analysis (BOCDA) based on phase-shift keying (PSK), in which the pseudo-random binary sequence (PRBS) phase coding is realized using a Mach-Zehnder modulator (MZM). Unlike the conventional phase-coded BOCDA using a phase modulator, which suffers from the non-rectangular transition in the encoded phase, the PSK can realize perfect phase switches between 0 and π with zero-width edges. It is not sensitive to the bandwidth of the modulator and the power of the radio-frequency modulation signal. Numerical simulations and experimental results prove that it can effectively suppress the Brillouin amplification in the off-peak positions. In experiment, a 2-mm spatial resolution sensing is realized using only a 20-GHz bandwidth MZM.
|Number of pages||9|
|State||Published - 9 Dec 2019|
Bibliographical noteFunding Information:
National Natural Science Foundation of China (61975045, 61605034, 61575052); China Postdoctoral Science Foundation (2016M591531); National Key Scientific Instrument and Equipment Development Projects of China (2017YFF0108700).
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