Liu Xiang, Zhang Jiao, Zhu Min, Xin Zhigang, Dong Tong Wei, Wang Yunwu, Cai Yuancheng, Hua Bingchang, Lei Mingzheng, Liu Bo, Yu Jianjun
Opt Express. 2024 Aug 12;32(17):29379-29393. doi: 10.1364/OE.531407.
We successfully demonstrate photonics-assisted single-carrier 466.4 Gbit/s wireless transmission over 20 km SSMF and 6 m single-input single-output (SISO) wireless delivery at 92.5 GHz. This is achieved by employing a likelihood-aware vector-quantized variational autoencoder (VQ-VAE) equalizer for polarization demultiplexing and an advanced multiple-input multiple-output (MIMO) Volterra nonlinear equalizer (MIMO-VNE) further to compensate linear and nonlinear crosstalk between two polarizations. The capacity and robustness of the fiber-wireless system are extensively investigated, verifying that our proposed VQ-VAE with shared-layer autoencoder (SLAE) model outperforms state-of-the-art blind equalizers such as those based on constant modulus algorithm (CMA), VAE, and VQ-VAE algorithms. Additionally, the dual-polarized 40 Gbaud PCS-64QAM signal achieves a 2 dB power margin while meeting the 0.83 NGMI threshold, and a 0.05 gain in NGMI compared to traditional methods. This low-complexity training framework paves the way for enhancing wireless air interface capacities to approach those of fiber-optic transmission within fiber-wireless integration systems.
我们成功演示了在20公里标准单模光纤（SSMF）上实现光子辅助单载波466.4 Gbit/s无线传输，并在92.5 GHz频率下通过6米单输入单输出（SISO）实现无线传输。这是通过采用用于偏振解复用的似然感知矢量量化变分自编码器（VQ-VAE）均衡器以及进一步用于补偿两个偏振之间线性和非线性串扰的先进多输入多输出（MIMO）沃尔泰拉非线性均衡器（MIMO-VNE）来实现的。对光纤无线系统的容量和鲁棒性进行了广泛研究，验证了我们提出的具有共享层自编码器（SLAE）模型的VQ-VAE优于基于常数模算法（CMA）、VAE和VQ-VAE算法等的现有盲均衡器。此外，双偏振40 Gbaud PCS-64QAM信号在满足0.83 NGMI阈值的同时实现了2 dB的功率余量，与传统方法相比，NGMI提高了0.05。这种低复杂度训练框架为增强无线空中接口容量以接近光纤无线集成系统中的光纤传输容量铺平了道路。
