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Laser & Optoelectronics Progress, Volume. 56, Issue 6, 060004(2019)

Key Technologies of Wireless Laser and Radio Frequency Complementary Communication System

Liang Ding1,2、*, Zhiyong Wu1, Yucong Gu1,2, Zechao Gao1,2, Jintian Hu1,2, and Shuang Ma1
Author Affiliations
  • 1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China
  • 2 University of Chinese Academy of Sciences, Beijing 100049, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (20)
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    References (52)
    Cited By (3)
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    Figures & Tables(20)
    Block diagram of FSO and RF complementary communication system

    Fig. 1. Block diagram of FSO and RF complementary communication system

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    Schematic of hard switching

    Fig. 2. Schematic of hard switching

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    Operation under dual FSO threshold

    Fig. 3. Operation under dual FSO threshold

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    Operation regions under dual FSO threshold

    Fig. 4. Operation regions under dual FSO threshold

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    Flow chart of time hysteresis algorithm

    Fig. 5. Flow chart of time hysteresis algorithm

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    Flow chart of power hysteresis algorithm

    Fig. 6. Flow chart of power hysteresis algorithm

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    Performance of trend prediction algorithm. (a) Reactive trend; (b) proactive trend

    Fig. 7. Performance of trend prediction algorithm. (a) Reactive trend; (b) proactive trend

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    Block diagram of switching system based on RMS detector

    Fig. 8. Block diagram of switching system based on RMS detector

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    Schematic of soft switching

    Fig. 9. Schematic of soft switching

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    Soft-switching complementary communication system based on packet-level Raptor codes

    Fig. 10. Soft-switching complementary communication system based on packet-level Raptor codes

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    Laser communication link with adaptive optics compensation

    Fig. 11. Laser communication link with adaptive optics compensation

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    Structural diagram of optical modem

    Fig. 12. Structural diagram of optical modem

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    Effect of OAGC on eye diagram of FSO link signal. (a) Without OAGC; (b) with OAGC

    Fig. 13. Effect of OAGC on eye diagram of FSO link signal. (a) Without OAGC; (b) with OAGC

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    Block diagram of DFE

    Fig. 14. Block diagram of DFE

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    System performances before and after equalization. (a) Before equalization; (b) after equalization

    Fig. 15. System performances before and after equalization. (a) Before equalization; (b) after equalization

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    Improvement in SNR after adopting DFE. (a) Before equalization; (b) after equalization

    Fig. 16. Improvement in SNR after adopting DFE. (a) Before equalization; (b) after equalization

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    Optical windows

    Fig. 17. Optical windows

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    • Table 1. Key parameters of switching system based on RMS power detector

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      Table 1. Key parameters of switching system based on RMS power detector

      Link typeInstrumentParameterItem
      FSO linkData sourceModulation formatNRZ-OOK
      Data rate /(Mbit·s-1)10100
      Laser diodePeak wavelength /nm785
      Output power /mW3
      Beam divergence /mrad2
      Optical lensDiameter /mm40
      Focal length /mm100
      PhotodetectorModuleThorlabs PDA10A-EC
      Spectral range of sensitivity /nm200-1100
      Active area /mm20.8
      Typical spectral sensitivity /(A·W-1)0.45 at 750 nm
      RF linkModulation formatQPSK
      Carrier frequency /GHz2.4
      Bandwith /MHz10
      Transmitted RF power /dB-3
      Link span /m5.5

    • Table 2. Characteristic analysis of main switching algorithms in complementary communication system

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      Table 2. Characteristic analysis of main switching algorithms in complementary communication system

      ParameterSNRthresholdTime andpower delayTrendpredictionRMS powerdetectorPacket-levelRaptor codes
      Traffic rateMediumLowMediumLowHigh
      Bit error rateLowLowLowHighLow
      ReliabilityHighHighLow
      Channel resource utilizationLowLowLowLowHigh
      Decoding overheadLowLow
      Hardwareimplementation complexityHighLowLow

    • Table 3. Performance comparison of systems with and without adaptive optics compensation under strong turbulence( Cn2=1.45×10-14)

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      Table 3. Performance comparison of systems with and without adaptive optics compensation under strong turbulence( Cn2=1.45×10-14)

      Transmitter
      adaptive
      optics
      status      		Receiver
      adaptive
      optics
      status      		Measured
      PIB /dBm      		Measured
      PIF /dBm      		Transmitter
      correction
      distance /m      		Receiver
      correction
      distance /m      		Measured
      PIB /dBm      		Measured
      PIF /dBm
      OnOn0.0-10.04,9504,950-1.2-11.3
      OnOff-2.0-22.04,6000-5.9-20.9
      OffOn-12.0-23.007,900-9.0-27.1
      OffOff-12.5-00-12.5-34.0
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    Liang Ding, Zhiyong Wu, Yucong Gu, Zechao Gao, Jintian Hu, Shuang Ma. Key Technologies of Wireless Laser and Radio Frequency Complementary Communication System[J]. Laser & Optoelectronics Progress, 2019, 56(6): 060004

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    Paper Information

    Category: Reviews

    Received: Aug. 27, 2018

    Accepted: Oct. 12, 2018

    Published Online: Jul. 30, 2019

    The Author Email: Liang Ding (dingliang100250206@163.com)

    DOI:10.3788/LOP56.060004

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology