Two-Way Optical Frequency Comparisons Over 100km Telecommunication Network Fibers

Abstract

By using two-way frequency transfer, we demonstrate ultra-high resolution comparison of optical frequencies over a telecommunication fiber link of 100 km operating simultaneously digital data transfer. We first propose and experiment a bi-directional scheme using a single fiber. We show that the relative stability at 1 s integration time is 7 10^18 and scales down to 5 10^21. The same level of performance is reached when an optical link is implemented with an active compensation of the fiber noise. We also implement a real-time two-way frequency comparison over a uni-directional telecommunication network using a pair of parallel fibers. The relative frequency stability is 10^15 at 1 s integration time and reaches 2 10^17 at 40 000 s. The fractional uncertainty of the frequency comparisons was evaluated for the best case to 2 10^20. These results open the way to accurate and high resolution frequency comparison of optical clocks over intercontinental fiber networks.

References in corpus (4)

• Coherent optical frequency transfer at 5e-19 over a doubled 642 km fiber link
• Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network
• Long-distance frequency transfer over an urban fiber link using optical phase stabilization
• Carrier-phase Two-Way Satellite Frequency Transfer over a Very Long Baseline

Cited by in corpus (2)

• Tackling the Limits of Optical Fiber Links
• Dissemination stability and phase noise specification of fiber-cascaded RF frequency dissemination