Multimode Angle-Compensated Interferometer with Long Time-Bin Delay Using a Multi-Pass Herriott Cell
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. Angle-compensated 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 multimode angle-compensated 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 an imaging 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∘.
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BibTeX
@misc{tannous2026multimode,
title = {{Multimode Angle-Compensated Interferometer with Long Time-Bin Delay Using a Multi-Pass Herriott Cell}},
author = {Ramy Tannous and Stéphane Vinet and Kaylee Sherk and Kimia Mohammadi and Thomas Jennewein},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2608.13399},
eprint = {2608.13399},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.13399},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Multimode Angle-Compensated Interferometer with Long Time-Bin Delay Using a Multi-Pass Herriott Cell
AU - Ramy Tannous
AU - Stéphane Vinet
AU - Kaylee Sherk
AU - Kimia Mohammadi
AU - Thomas Jennewein
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2608.13399
UR - https://arxiv.org/abs/2608.13399
AB - 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. Angle-compensated 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 multimode angle-compensated 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 an imaging 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^∘.
ER -