Optical frequency combs (OFC) have revolutionized the field of optics ranging from metrology to radio-frequency photonics. One of the main advantages of an OFC is its spectral purity and broadband phase coherence. An increase in comb linewidth corresponds to elevated phase noise and system performance degradation that mandates larger processing complexity. A specialized processing scheme relying on Vernier OFC pair seeded by a single laser has highly correlated tones over the entire processing band. Recognizing this fact, this report describes a low complexity joint phase noise compensation scheme for orthogonal frequency division multiplexing (OFDM) receiver assisted by dual combs. 4-QAM modulated OFDM signals with 60 subcarriers were demodulated using a dual-comb OFDM receiver. The experiment measured the error vector magnitude (EVM) to validate the receiver performance. The new joint phase noise compensation algorithm can effectively suppress phase noise for high order tones without pilot channels and was shown to be robust under variable SNR levels.

中文翻译：

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双梳辅助OFDM接收机中的联合相位噪声补偿

光频梳 (OFC) 彻底改变了从计量学到射频光子学的光学领域。OFC 的主要优势之一是其光谱纯度和宽带相位相干性。梳状线宽的增加对应于相位噪声的升高和系统性能的下降，这需要更大的处理复杂性。依赖于由单个激光播种的 Vernier OFC 对的专门处理方案在整个处理带上具有高度相关的色调。认识到这一事实，本报告描述了一种用于由双梳辅助的正交频分复用 (OFDM) 接收器的低复杂度联合相位噪声补偿方案。使用双梳状 OFDM 接收器对具有 60 个子载波的 4-QAM 调制 OFDM 信号进行解调。该实验测量误差矢量幅度 (EVM) 以验证接收器性能。新的联合相位噪声补偿算法可以有效地抑制没有导频通道的高阶音调的相位噪声，并且在可变 SNR 水平下表现出稳健性。