Université de Franche-Comté, SUPMICROTECH, CNRS, Institut FEMTO-ST, F-25000 Besançon, France.
Rev Sci Instrum. 2023 Mar 1;94(3):034716. doi: 10.1063/5.0138599.
This article reports on the use of a Field Programmable Gate Array (FPGA) platform for local ultra-stable optical frequency distribution through a 90 m-long fiber network. This platform is used to implement a fully digital treatment of the Doppler-cancellation scheme required by fiber links to be able to distribute ultra-stable frequencies. We present a novel protocol that uses aliased images of a digital synthesizer output to directly generate signals above the Nyquist frequency. This approach significantly simplifies the setup, making it easy to duplicate within a local fiber network. We demonstrate performances enabling the distribution of an optical signal with an instability below 10 at 1 s at the receiver end. We also use the board to implement an original characterization method. It leads to an efficient characterization of the disturbance rejection of the system that can be realized without accessing the remote output of the fiber link.
本文报告了使用现场可编程门阵列（FPGA）平台通过 90 米长的光纤网络实现局部超稳定光频率分布的情况。该平台用于实现光纤链路所需的多普勒消除方案的全数字处理，以便能够分配超稳定频率。我们提出了一种新协议，该协议使用数字合成器输出的混叠图像直接生成奈奎斯特频率以上的信号。这种方法大大简化了设置，使得在本地光纤网络中很容易复制。我们演示了在接收器端实现低于 10 皮秒/秒的光信号不稳定度的性能。我们还使用该电路板实现了一种原始的特征描述方法。它可以有效地描述系统的抗干扰能力，而无需访问光纤链路的远程输出。
