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- W2783485756 abstract "In this paper, a novel method for generating high-quality chirped pulses with IQ modulator is studied theoretically and experimentally, which is a crucial building block for high-performance coherent optical time-domain reflectometry (COTDR). In order to compensate the nonlinearity of the modulator transfer function, we present a predistortion technique for chirped-pulse coherent optical time-domain reflectometry (CP-COTDR), the arcsin predistortion method and the single sideband with a suppressed carrier analog modulation used to generate the high quality chirped optical pulse. The high order sidebands, due to the large amplitude of the modulation signal and the nonlinear transfer function of the IQ modulator, can be relieved by the predistortion process, which means the power and the quality of the generated chirped pulse has been improved. In the experiment, this method increases the peak power of the chirped pulse by 4.2 dB compared to the case without predistortion process, as for the CP-COTDR system, this method increases the signal-to-noise ratio of the demodulated phase variation by 6.3 dB." @default.
- W2783485756 created "2018-01-26" @default.
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- W2783485756 date "2018-01-25" @default.
- W2783485756 modified "2023-10-17" @default.
- W2783485756 title "Chirped-pulse coherent-OTDR with predistortion" @default.
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- W2783485756 doi "https://doi.org/10.1088/2040-8986/aaa6fe" @default.
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