All-optical link for direct comparison of distant optical clocks

We developed an all-optical link system for making remote comparisons of two distant ultra-stable optical clocks. An optical carrier transfer system based on a fiber interferometer was employed to compensate the phase noise accumulated during the propagation through a fiber link. Transfer stabilitie...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2011-08
Main Authors: Fujieda, Miho, Kumagai, Motohiro, Nagano, Shigeo, Yamaguchi, Atsushi, Hachisu, Hidekazu, Ido, Tetsuya
Format: Article
Language:English
Subjects:
Active control
Clocks
Doped fibers
Erbium
Fiber optic networks
Frequency standards
Noise propagation
Optical frequency
Polarization
Reproducibility
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We developed an all-optical link system for making remote comparisons of two distant ultra-stable optical clocks. An optical carrier transfer system based on a fiber interferometer was employed to compensate the phase noise accumulated during the propagation through a fiber link. Transfer stabilities of \(2\times10^{-15}\) at 1 second and \(4\times10^{-18}\) at 1000 seconds were achieved in a 90-km link. An active polarization control system was additionally introduced to maintain the transmitted light in an adequate polarization, and consequently, a stable and reliable comparison was accomplished. The instabilities of the all-optical link system, including those of the erbium doped fiber amplifiers (EDFAs) which are free from phase-noise compensation, were below \(2\times10^{-15}\) at 1 second and \(7\times10^{-17}\) at 1000 seconds. The system was available for the direct comparison of two distant \(^{87}\)Sr lattice clocks via an urban fiber link of 60 km. This technique will be essential for the measuring the reproducibility of optical frequency standards.
ISSN:2331-8422
DOI:10.48550/arxiv.1108.2775