OFDR Harmonic-Noise Elimination Based on a Real-Time STF-VCFIR Filter System

Luwei Shuai; Lei Ye; Xuan Li; Zhaoyong Wang; Kan Gao; Qing Ye

doi:10.3788/CJL240858

Chinese Journal of Lasers, Volume. 52, Issue 2, 0206002(2025)

OFDR Harmonic-Noise Elimination Based on a Real-Time STF-VCFIR Filter System

Luwei Shuai^1,2, Lei Ye^1、**, Xuan Li^1,2, Zhaoyong Wang^1,3, Kan Gao¹, and Qing Ye^1,2、*

¹Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

³Shanghai Zhongke Shenguang Optoelecronic Industry Co., Ltd., Shanghai 201815, China

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Figures & Tables(11)

Fig. 1. OFDR basic optical path

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Fig. 2. Time-frequency diagram of the test signal and the low-pass filter

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Fig. 3. Time spectrum of STF-VCFIR filter

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Fig. 4. Measurement of the short-time frequency by the over-zero-counting method

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Fig. 5. Signal processing process of STF-VCFIR filter

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Fig. 6. STF-VCFIR filter system structure

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Fig. 7. OFDR system chart

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Fig. 8. Full-spectrum reflection contrast

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Fig. 9. Details of reflection and scattering

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Fig. 10. Noise contrast map

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Table 1. Frequency-address conversion truth table
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Table 1. Frequency-address conversion truth table
Frequency range /MHz Cut-off frequency /MHz Address
8‒12 6 0x00
4‒8 5 0x01
2‒4 2 0x02
0.5‒2.0 1 0x03

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Luwei Shuai, Lei Ye, Xuan Li, Zhaoyong Wang, Kan Gao, Qing Ye. OFDR Harmonic-Noise Elimination Based on a Real-Time STF-VCFIR Filter System[J]. Chinese Journal of Lasers, 2025, 52(2): 0206002

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