Yongxin Cheng, Xingqi Yang, Yufan Zhang, Chao Zhang, Hao Zhang, Zhijian Tong, Yizhan Dai, Weichao Lü, Xin Li, Haiwu Zou, Zejun Zhang, Jing Xu. 50 m/187.5 Mbit/s real-time underwater wireless optical communication based on optical superimposition[J]. Chinese Optics Letters, 2023, 21(2): 020601
- Chinese Optics Letters
- Vol. 21, Issue 2, 020601 (2023)
Fig. 1. Process of PAM-4 modulation and demodulation based on FPGA.
Fig. 2. Experimental setup diagram of the proposed UWOC system based on the FPGA and a fiber combiner. Inserts: (a) the FPGA, (b) the transmitter cabin, (c) the receiver cabin, and (d) the transmitter cabin in a 50 m swimming pool.
Fig. 3. (a) P-I and V-I curves of the LD; (b) normalized frequency responses of the system.
Fig. 4. Transfer curve of the UWOC system.
Fig. 5. Relationships between attenuation of VEA and real-time BER under different bias currents in (a) the electrical PAM-4 scheme and (b) the optical PAM-4 scheme.
Fig. 6. BERs of the real-time processing and offline processing at different data rates.
Fig. 7. EVM at different data rates in the optical and electrical PAM-4 UWOC system. Inserts: (a) electrical PAM-4 scheme at 187.5 Mbit/s, (b) optical PAM-4 scheme at 187.5 Mbit/s.
Fig. 8. Ratio of the amplitude difference at different data rates in the optical and electrical PAM-4 UWOC system.
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Table 1. The Progress of UWOC Systems
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