In this Letter, we propose and demonstrate a multi-band signal-receiving system, powered by photonic frequency down-conversion and transfer learning. A photonic frequency down-conversion system directly receives the microwave signals, and the transfer-learning network (TLN) lowers the noise in the signals. In addition to the effectiveness of denoising, the TLN also features ultra-fast retraining for signals of different types or different multi-band frequencies. Experimental results showed that the proposed microwave-signal-receiving system can improve the signal-to-noise (SNR) ratio of signals of different types, SNR, and duty cycles. For network retraining, the TLN requires only three times less data and 10 times less time consumption than conventional training methods.

中文翻译：

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具有光子频率下变频和转移学习网络的多频段低噪声微波信号接收系统

在这封信中，我们提出并演示了一个多频段信号接收系统，由光子频率下变频和转移学习驱动。光子频率下变频系统直接接收微波信号，传输学习网络（TLN）降低信号中的噪声。除了去噪的有效性之外，TLN 还具有针对不同类型或不同多频段频率的信号的超快速重新训练。实验结果表明，所提出的微波信号接收系统可以提高不同类型、SNR 和占空比信号的信噪比 (SNR)。对于网络再训练，TLN 只需要比传统训练方法少 3 倍的数据和 10 倍的时间消耗。