Hollow-core fiber achieves 7.3 x 10^-21 fractional frequency instability at 10,000 s over a 152 km single-span link by lowering thermal sensitivity and avoiding stimulated Brillouin scattering limits seen in standard fiber.
Non-reciprocity in optical fiber links: experimental evidence.Optics Express, 29(11):17476–17490, 2021
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Hollow-Core Fiber for Long-Span Optical Frequency Transfer: Improved Instability and Extended Single-Span Reach
Hollow-core fiber achieves 7.3 x 10^-21 fractional frequency instability at 10,000 s over a 152 km single-span link by lowering thermal sensitivity and avoiding stimulated Brillouin scattering limits seen in standard fiber.