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High-Efficiency and Flat-Top Electro-Optic Frequency Comb Using a Single Modulator and Drive on Thin-Film Lithium Niobate
ACS Photonics ( IF 6.5 ) Pub Date : 2025-01-22 , DOI: 10.1021/acsphotonics.4c01688
Gengxin Chen, Ziliang Ruan, Liu Liu

Optical frequency comb sources are essential components for applications in high-capacity optical communication, large-scale optical computing systems, and high-precision laser-based light detection and ranging. These applications require high-performance, flexible, and easy-to-operate chip-scale integrated frequency comb generators featuring good spectral flatness and high efficiency. Here, we demonstrate a new design strategy to achieve flat-top electro-optic frequency combs on the thin-film lithium niobate platform using a hybrid-mode Mach–Zehnder modulator structure. The proposed device adopts only a single modulator and a single microwave source, greatly reducing the overhead on the microwave components as well as the operation of the device. The fabricated device shows a low optical loss of ∼0.2 dB, a tunable central wavelength up to a range of ∼80 nm, a flexible frequency spacing from 18 to 38 GHz, and a wide 5 dB flat-top optical bandwidth of ∼6.38 nm. A double-pass configuration with a compact footprint of 0.745 × 0.07 cm is also introduced to fully exploit the coplanar microwave waveguide on the chip. A similar comb performance is obtained using this device, showing a doubled efficiency for comb generations.

中文翻译:


使用单个调制器的高效平顶电光频率梳,并驱动薄膜铌酸锂



光频率梳源是大容量光通信、大规模光计算系统以及基于激光的高精度光探测和测距应用的重要元件。这些应用需要高性能、灵活且易于操作的芯片级集成频率梳发生器,这些频率梳子发生器具有良好的频谱平坦度和高效率。在这里,我们展示了一种新的设计策略,使用混合模式 Mach-Zehnder 调制器结构在薄膜铌酸锂平台上实现平顶电光频率梳。该器件仅采用单个调制器和单个微波源,大大减少了微波元件的开销以及器件的运行。该器件具有 ∼0.2 dB 的低光损耗、高达 ∼80 nm 的可调中心波长、18 至 38 GHz 的灵活频率间隔以及 ∼6.38 nm 的 5 dB 宽平顶光带宽。此外,还引入了一种占用空间仅为 0.745 × 0.07 cm 的双通道配置,以充分利用芯片上的共面微波波导。使用该设备获得了类似的电梳性能,显示电梳的效率提高了一倍。
更新日期:2025-01-22
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