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.
Silica-core single-mode fiber with lowest loss of 0.1397 db/km.Journal of Lightwave Technology, 43(4):1837–1842, 2025
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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.