Abstract
Underwater wireless optical communication (UWOC) can realize high speed, low delay and flexible information transmission. We experimentally demonstrate a 3-m UWOC system using blue laser diode and avalanche photodiode with quadrature amplitude modulation (QAM) and orthogonal frequency division multiplexing (OFDM) transmission. We achieve net bit rates of 6.23 Gb/s at a bit error rate (BER) of 1.55 × 10−3, by using 128-QAM OFDM signals. High-order QAM signals require higher bit resolution of digital-to-analog converter (DAC). Therefore, the effect of quantization noise on transmission performance is further investigated. In order to meet the requirement that the BER is lower than 3.8 × 10−3, the bit resolution of DAC is required to be at least 5, 6 and 7 bit for 32-QAM, 64-QAM and 128-QAM signals, respectively.
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Acknowledgements
This work is supported by University Natural Science Research Project of Anhui Province (Grant No.: KJ2019A0616) and the key projects in natural science of West Anhui University (Grant No.: WXZR201719) and by the quality engineering project in natural science of West Anhui University (Grant No.: wxxy2017122).
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Guo, Y., Wang, X. & Fu, M. QAM–OFDM transmission in underwater wireless optical communication system with limited resolution DAC. Opt Quant Electron 52, 419 (2020). https://doi.org/10.1007/s11082-020-02529-9
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DOI: https://doi.org/10.1007/s11082-020-02529-9