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.
A zero-dead-time strontium lattice clock with a stability at10−19level.Physical Review Letters, 135(26):263402
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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.