Mr. Zhiwei Huang Profile

Zhiwei Huang

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Proceedings Article | 30 April 2024 Paper

Laser communication systems between high-altitude aircraft and underwater platforms with real-time PPM time slot correction algorithm

Chongmiao Jiao, Yan He, Shanjiang Hu, Haoda Ma, Zhiwei Huang, Weibiao Chen

Proceedings Volume 13157, 131570I (2024) https://doi.org/10.1117/12.3016140

KEYWORDS: Laser communications, Pulse signals, Clocks, Demodulation, Data transmission, Telecommunications, Pulsed laser operation, Field programmable gate arrays, Laser systems engineering, Doppler effect

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Laser communication technology has garnered considerable attention in recent times due to its advantageous features such as high security, wide bandwidth, and high transmission rate. Its potential for long-distance atmosphere-sea information transmission is particularly promising. In this study, we developed a laser communication system that utilized a high-altitude aircraft and an underwater platform, enabling communication distances of up to 10 km in the air and 100 m underwater. The system incorporates a high-power blue-green laser, delivering an energy of 80 mJ per laser pulse with a repetition frequency of 100 Hz. During experimental investigations, we found that the Doppler shift effect becomes more pronounced with communication time. This phenomenon becomes more pronounced when transmitting large-capacity data, as cumulative frequency errors can lead to pulses appearing in incorrect time slots, resulting in erroneous demodulation of data by the pulse position modulation (PPM) scheme. A time-slot synchronization correction algorithm was proposed for PPM demodulation. This algorithm utilized a broad time-slot modulation technique to ensure that the information pulse is positioned at the center of the time slot. Real-time predictions of clock offset error are made by statistically analyzing the laser pulse position within a given time slot. Subsequently, the clock count is corrected using the obtained error information. The proposed algorithm effectively eliminates erroneous time slots resulting from the accumulation of frequency shift errors, thereby significantly reducing the bit error rate (BER) in the transmission of large-capacity data over long distances through atmosphere-sea laser communication.

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