Principles of High-Speed Acquisition of Brillouin Gain Spectrum (Bgs) and Brillouin Frequency Shift (IMAGE)

_Tokyo Institute of Technology

Principles of High-Speed Acquisition of Brillouin Gain Spectrum (Bgs) and Brillouin Frequency Shift

Caption

(a) BGS acquisition. By mixing with a frequency-swept microwave, the BGS originally observed in the frequency domain can be obtained in the time domain at high speed. (b) BFS acquisition. The BGS is approximated by a one-period sinusoidal waveform and rectified. Its phase delay, which corresponds to the BFS, is then detected using an exclusive-OR (XOR) logic gate and a low-pass filter (LPF). The output voltage is in one-to-one correspondence with the phase delay in the range from 0 to 180°.

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Tokyo Institute of Technology

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