Acta Optica Sinica, Volume. 41, Issue 13, 1306011(2021)
Background Phase Noise of Interferometric TDM Sensing Array Based on Fiber Bragg Grating
Figures & Tables(14)
Fig. 1. Structure of interferometric time-division multiplexing sensor array system based on fiber Bragg grating
Fig. 3. Spectrum characteristics before and after application PGC modulated carrier signal. (a) Before application; (b) after application
Fig. 4. Relationship between high frequency noise and PGC modulation frequency. (a) 50 kHz; (b) 16 kHz ; (c) 10 kHz ; (d) 6 kHz
Fig. 5. Noise demodulation results at different modulation frequencies. (a) White noise; (b) noise with frequency of 1/f; (c) noise with frequency of 1/f2; (d) mixed noise
Fig. 6. Experimental system of 8-fold time-division multiplexed single-mode fiber Bragg grating sensing array
Fig. 7. Measurement results of background phase noise in 8 time-division multiplexed channels
Fig. 8. Measurement results of background phase noise in two time-division multiplexed channels
Fig. 9. Measurement results of background phase noise in four time-division multiplexed channels
Fig. 10. Experimental system of 8 time-division multiplexing polarization-maintaining fiber Bragg grating sensor array
Fig. 11. Measurement results of background phase noise in all polarization-maintaining 8 time-division multiplexing channels
Fig. 12. Relationship between phase noise and PGC modulation frequency at 1 kHz frequency
Table 1. Simulation parameters of PGC modulation and demodulation noise aliasing
View tableTable 1. Simulation parameters of PGC modulation and demodulation noise aliasing
Ii_DC /mW C fPGC /kHz ϕs(t) /rad ϕg /rad 1+0.01·w 2.37 50,16,10,6 5 w·cos(2πkt) (1+0.001·w)π/2
Table 2. Main design structure and modulation parameters of 4 sets of fiber Bragg grating sensor array system
View tableTable 2. Main design structure and modulation parameters of 4 sets of fiber Bragg grating sensor array system
Parameter 1 2 3 4 Laser source type Fiber laser Fiber laser Fiber laser Laser diode Relative intensity noise of laser at 1 kHz /dB -120 -120 -120 -110 N 8 2 4 8 Reflectivity /% 0.6 0.6 0.6 0.1 Polarization control PS PS PS All polarization- maintaining Fiber length of element /m 58.78 39.75 18.25 40.00 fAOM /kHz 192 320 512 400 fPGC /kHz 6 10 16 50
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Fan Shang, Yue Qi, Lina Ma, Peng Jiang, Yu Chen, Jun Wang, Shuidong Xiong. Background Phase Noise of Interferometric TDM Sensing Array Based on Fiber Bragg Grating[J]. Acta Optica Sinica, 2021, 41(13): 1306011
Paper Information
Category: Fiber Optics and Optical Communications
Received: Mar. 1, 2021
Accepted: May. 6, 2021
Published Online: Jul. 11, 2021
The Author Email: Ma Lina (mln_c7@nudt.edu.cn)
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