AI 中文总结
该研究针对自由空间光通信中大气湍流导致的多模式接收需求，设计了基于多通Herriott池的场展宽多模干涉仪，实现了12ns时滞、0.4°视场下的高干涉可见度，为无源干涉方案提供了原理验证。
AI 中文摘要
自由空间信道中光信号的干涉要求光接收机支持多种空间模式，这是由于大气湍流，通常需要自适应光学系统。场展宽干涉仪提供了一种无源替代方案，使其对于具有约1纳秒量级延迟的时Bin编码信号特别有吸引力。在此，我们展示了一种场展宽多模干涉仪设计，该设计在具有大时间Bin间隔的空间多模光束上实现了高干涉可见度。多模光束的干涉通过多通Herriott池实现，该池能够在小外形尺寸下实现非常长的路径差。该设计通过数值光线追踪模拟和原理验证演示进行了测试。我们构建了一个路径长度差为12纳秒的干涉仪原型，确定其在0.4°的大视场下保持高干涉可见度。
英文摘要
Interference of optical signals in free-space channels requires optical receivers to support many spatial modes due to atmospheric turbulence, typically necessitating adaptive optics systems. Field-widened interferometers offer a passive alternative, making them particularly attractive for time-bin encoded signals with delays on the order of one nanosecond. Here, we demonstrate a field-widened, multimode interferometer design that achieves a high interference visibility for spatially multimode beams with large time bin separations. The interference of the multimode beams is enabled using a multi-pass Herriott cell that enables a very long path separation with a small form-factor. The design is tested using both numerical ray-tracing simulations and proof-of-principle demonstrations. We create a prototype interferometer with a path length difference of 12ns and determine that it maintains a high interference visibility with a large field-of-view of $0.4^{\circ}$.
Comments17 pages, 8 figures
