Baseband Modulation Signal Generation and Phase Synchronization Method of Space High Speed Optical Communication

WANG Dizhu; JIN Yi; ZUO Jinzhong; XU Changzhi; LIANG Huijian; GOU Baowei

doi:10.11999/JEIT231460

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WANG Dizhu, JIN Yi, ZUO Jinzhong, XU Changzhi, LIANG Huijian, GOU Baowei. Baseband Modulation Signal Generation and Phase Synchronization Method of Space High Speed Optical Communication[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT231460

Citation:

WANG Dizhu, JIN Yi, ZUO Jinzhong, XU Changzhi, LIANG Huijian, GOU Baowei. Baseband Modulation Signal Generation and Phase Synchronization Method of Space High Speed Optical Communication[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT231460

Citation:

WANG Dizhu, JIN Yi, ZUO Jinzhong, XU Changzhi, LIANG Huijian, GOU Baowei. Baseband Modulation Signal Generation and Phase Synchronization Method of Space High Speed Optical Communication[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT231460

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Baseband Modulation Signal Generation and Phase Synchronization Method of Space High Speed Optical Communication

doi: 10.11999/JEIT231460

China Academy of Space Technology-Xi’an, Xi’an 710100, China

Funds: The National Natural Science Foundation of China (62301418), The State Key Laboratory Stability Support Fund (HTKJ2022KL504006)

Received Date: 2024-01-09
Rev Recd Date: 2024-03-18

Available Online: 2024-03-26

Abstract

Abstract

The high-quality generation and precise phase synchronization of high-speed modulated baseband signals are key technologies of space optical communication ranging system. Traditional approaches relying on FPGA or Digital Signal Processor (DSP) and high-speed Digital to Analog Convertor (DAC) technology often suffer from limited phase synchronization accuracy and high hardware complexity. A method for high-speed optical communication baseband signal generation and phase synchronization is proposed and a phase-locked dynamic control loop is designed in this paper. By dynamically adjusting the phase of the high-speed signal transmission clock in real time, the deterministic relationship between the I/Q high-speed baseband signal phase and the external reference clock phase can be achieved. The experimental results demonstrate impressive performance metrics: When the code rate is of the Quadrature Phase Shift Keying (QPSK) optical modulated signal is 2.5 Gbit/s, the phase synchronization accuracy is less than 2 ps and the Error Vector Magnitude (EVM) is less than 8%; the bit error rate is 10^–7 at a 5 Gbit/s optical communication rate, the receiver sensitivity is better than –47 dBm, and the ranging accuracy is better than 2 mm. Compared with traditional methods, both sensitivity and ranging accuracy are significantly improved.
- Optical communication ranging,
- Phase synchronization,
- Closed-loop dynamic control,
- Error Vector Magnitude(EVM)

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References(17)

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