Title: On-chip amplification-free fCEO detection and broadband SCG in parabolically width-modulated TFLN waveguides Show Chinese title

Title: 片上无放大器的fCEO检测和抛物线宽度调制的TFLN波导中的宽带SCG

Abstract: We demonstrate amplification-free carrier-envelope offset (fCEO) detection in parabolically width-modulated z-cut thin-film lithium niobate (TFLN) waveguide that simultaneously engineers dispersion and enhances nonlinear interactions. With 116 fs pulses at 1560 nm, the device generates more than two octaves broadband SCG spanning 600 to beyond 2400 nm, enabling spectral overlap between dispersive waves and second-harmonic generation near 780 nm for robust f-2f self-referencing. Most notably, we achieve the first fully amplification-free, on-chip fCEO detection without optical or electronic amplifiers, obtaining 34 dB SNR at 100 kHz RBW and 57 dB at 100 Hz RBW, the highest reported to date under such conditions. These results establish a new benchmark for scalable, power-efficient, self-referenced frequency combs and quantum-enabled photonic systems. Show Chinese abstract

Abstract: 我们展示了在抛物线宽度调制的z切向薄膜铌酸锂(TFLN)波导中无需放大的载波包络相位( fCEO )检测，该波导同时设计了色散并增强了非线性相互作用。 使用116 fs脉冲在1560 nm处，该器件生成超过两个八度的宽带超连续谱，覆盖600至超过2400 nm，实现了在780 nm附近的色散波和二次谐波生成之间的光谱重叠，从而实现了稳健的f-2f自参考。 最显著的是，我们实现了首个完全无需放大的片上 fCEO 检测，无需光学或电子放大器，在100 kHz RBW下获得34 dB信噪比，在100 Hz RBW下获得57 dB信噪比，这是在这些条件下迄今为止报道的最高值。 这些结果为可扩展、高效能、自参考频率梳和量子增强的光子系统建立了新的基准。