Fei Liu, Han Yan, Bo Hua, Xiaoping Zheng, Min Zhang. Effect of Carrier Phase Bias on Demodulation of Fiber-Optic Seismometer[J]. Acta Optica Sinica, 2017, 37(9): 0906001
- Acta Optica Sinica
- Vol. 37, Issue 9, 0906001 (2017)
Fig. 1. Diagram of interferometric fiber-optic detector based on heterodyne scheme
Fig. 2. Signal demodulation diagram in heterodyne scheme
Fig. 3. Theoretical and simulation results of THD versus signal amplitude. (a) fs=200 Hz, frep=200 kHz, fc=50 kHz; (b) fs=1 kHz, frep=200 kHz, fc=50 kHz; (c) fs=200 Hz, frep=400 kHz, fc=50 kHz; (d) fs=200 Hz, frep=200 kHz, fc=25 kHz
Fig. 4. Theoretical and simulation results of maximum THD versus carrier phase bias. (a) fs=200 Hz, frep=200 kHz, fc=50 kHz; (b) fs=1 kHz, frep=200 kHz, fc=50 kHz; (c) fs=200 Hz, frep=400 kHz, fc=50 kHz; (d) fs=200 Hz, frep=200 kHz, fc=25 kHz
Fig. 5. Theoretical and simulation results of RAE versus signal amplitude. (a) fs=200 Hz, frep=200 kHz, fc=50 kHz; (b) fs=1 kHz, frep=200 kHz, fc=50 kHz; (c) fs=200 Hz, frep=400 kHz, fc=50 kHz; (d) fs=200 Hz, frep=200 kHz, fc=25 kHz
Fig. 6. Theoretical and simulation results of RAE versus carrier phase bias. (a) fs=200 Hz, frep=200 kHz, fc=50 kHz; (b) fs=1 kHz, frep=200 kHz, fc=50 kHz; (c) fs=200 Hz, frep=400 kHz, fc=50 kHz; (d) fs=200 Hz, frep=200 kHz, fc=25 kHz
Fig. 7. Comparison of demodulation results with and without phase bias. (a) THD without phase bias; (b) THD with phase bias
Fig. 8. (a) THD versus phase bias; (b) RAE versus phase bias
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