An optical analog noise encryption system with adaptive recovery of two-dimensional keys is proposed and demonstrated using regular triangle (RT)adaptive algorithm in an optical self-interference cancellation system at the designated receiver. Analog noise encryption and data modulation are performed in a single dual-drive Mach-Zehnder modulator at the transmitter, while decryption is performed in an electro-absorption modulated laser based adaptive cancellation system at the receiver. The weight and delay of the analog noise form the two-dimensional orthogonal encryption keys. Two sets of fingerprints are securely pre-shared for only once between the transmitter and designated receiver and stored before real transmission to ensure that both sides are legitimate users and facilitate adaptive key recovery when using RT adaptive algorithm at the legitimate receiver for retrieving the orthogonal keys. Without receiving the keys from the transmitter, the legitimate receiver is able to adaptively find the two orthogonal keys even under dynamic key changing scenario. In the experiment, a 3.5 GHz wideband analog noise is used to encrypt a 10 Gbps 16 quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) signal at 1.75 GHz. By recovering the orthogonal keys using RT algorithm and the unique pre-shared fingerprints, the designated receiver has successfully decrypted the encrypted signal by removing the analog noise as wide as 3.5 GHz, 28 dB stronger than the sensitive signal, which is by far the best performance in an optical analog noise encryption system.

中文翻译：

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具有二维密钥自适应恢复的光学模拟噪声加密


提出了一种具有二维密钥自适应恢复功能的光学模拟噪声加密系统，并在指定接收器的光学自干扰消除系统中使用正三角形（RT）自适应算法进行了演示。模拟噪声加密和数据调制在发射器处的单个双驱动马赫-曾德调制器中执行，而解密则在接收器处基于电吸收调制激光的自适应消除系统中执行。模拟噪声的权重和延迟形成二维正交加密密钥。两组指纹仅在发送器和指定接收器之间安全地预共享一次，并在真正传输之前存储，以确保双方都是合法用户，并在合法接收器使用 RT 自适应算法检索正交密钥时促进自适应密钥恢复。即使在动态密钥变化的情况下，合法接收器也能够在不从发送器接收密钥的情况下自适应地找到两个正交密钥。实验中，使用 3.5 GHz 宽带模拟噪声对 1.75 GHz 的 10 Gbps 16 正交调幅 (QAM) 正交频分复用 (OFDM) 信号进行加密。通过使用RT算法和独特的预共享指纹恢复正交密钥，指定接收器成功解密了加密信号，消除了宽达3.5 GHz的模拟噪声，比敏感信号强28 dB，这是迄今为止最好的光学模拟噪声加密系统的性能。