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An all-fiber-instant laser wavelength measurement scheme based on dual etalons and an optical linear filter is proposed and demonstrated. The linear filter is utilized for the coarse measurement, while the Fabry–Pérot etalons are employed for the fine measurement. By slightly tilting the refractive angle of one etalon, its phase and waveform can be tuned. Thus, the waveforms of two etalons can compensate...
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