• Acta Photonica Sinica
  • Vol. 54, Issue 2, 0254109 (2025)
Zhen ZHANG and Changlei GUO*
Author Affiliations
  • MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics & School of Physics and Astronomy, Frontiers Science Center for TianQin, CNSA Research Center for Gravitational Waves, Sun Yat-sen University (Zhuhai Campus), Zhuhai 519082, China
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    DOI: 10.3788/gzxb20255402.0254109 Cite this Article
    Zhen ZHANG, Changlei GUO. Low-noise Photodetection Technology for Multiband Laser-intensity-noise Suppression[J]. Acta Photonica Sinica, 2025, 54(2): 0254109 Copy Citation Text show less
    Circuit diagram of the low noise photodetector
    Fig. 1. Circuit diagram of the low noise photodetector
    Calculation model for transfer function of the photodetector
    Fig. 2. Calculation model for transfer function of the photodetector
    Frequency response of the photodetector
    Fig. 3. Frequency response of the photodetector
    Circuit model of input voltage noise of the OP AMPs
    Fig. 4. Circuit model of input voltage noise of the OP AMPs
    Noise gain curves of input voltage noise of the OP AMPs
    Fig. 5. Noise gain curves of input voltage noise of the OP AMPs
    Circuit model of input current noise of the OP AMPs
    Fig. 6. Circuit model of input current noise of the OP AMPs
    Noise gain curves of input current noise of the OP AMPs
    Fig. 7. Noise gain curves of input current noise of the OP AMPs
    Circuit model of voltage noise of resistor R1
    Fig. 8. Circuit model of voltage noise of resistor R1
    Noise gain curves of voltage noises of the resistors
    Fig. 9. Noise gain curves of voltage noises of the resistors
    Calculated total output voltage noise of the photodetector
    Fig. 10. Calculated total output voltage noise of the photodetector
    Scheme for bandwidth measurement of the photodetector
    Fig. 11. Scheme for bandwidth measurement of the photodetector
    Bandwidth measurement results of the photodetector
    Fig. 12. Bandwidth measurement results of the photodetector
    Experiment setup for output noise measurement of the photodetector
    Fig. 13. Experiment setup for output noise measurement of the photodetector
    Output noise measurement results of the photodetector
    Fig. 14. Output noise measurement results of the photodetector
    ElementValueReference
    R110 kΩ\
    R250 Ω\
    R3100 kΩ\
    R41 kΩ\
    R550 Ω\
    C11 pF\
    C21 pF\
    C310 nF\
    Cs16 pF\
    AH070 dB28
    ωH03.2 Mrad/s28
    AL0140 dB29
    ωL01.6 rad/s29
    Table 1. Device parameter list
    DeviceVoltage noise vthCorner frequency fcCurrent noise ithReference
    OPA6574.8 nV/Hz1/21 kHz1.3 fA/Hz1/228
    LTC105090 nV/Hz1/201.8 fA/Hz1/229
    Table 2. Basic noise parameters of the OP AMPs
    ParameterValueReference
    Electric charge q1.602×10-19 C24
    Boltzmann constant KB1.38×10-23 J/K24
    Temperature T298 K24
    Dark current ID1×10-10 A30
    Photocurrent IL024
    Junction resistance Rsh1×108 Ω30
    Table 3. Basic parameters of current noise in the photodiode
    Zhen ZHANG, Changlei GUO. Low-noise Photodetection Technology for Multiband Laser-intensity-noise Suppression[J]. Acta Photonica Sinica, 2025, 54(2): 0254109
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