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.
Temperature-induced noise-insensitive laser repeater station for optical frequency transfer.IEEE Transactions on Instrumentation and Measurement, 74:1–11, 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.