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arXiv · 2608.13399

Field-Widened Multimode Interferometer with Long Time-Bin Delay Using a Multi-Pass Herriott Cell

Ramy Tannous·Stéphane Vinet·Kaylee Sherk·Kimia Mohammadi·Thomas Jennewein
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Abstract

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 $0.4^{\circ}$.

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Ramy Tannous, Stéphane Vinet, Kaylee Sherk, Kimia Mohammadi, Thomas Jennewein. 2026-08-13. Field-Widened Multimode Interferometer with Long Time-Bin Delay Using a Multi-Pass Herriott Cell. https://arxiv.org/abs/2608.13399

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