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.
Ultra-stable long distance optical frequency distribution using the internet fiber network.Optics Express, 20(21):23518– 23526, 2012
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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.