2007/07/01 by Seth M. Foreman, Andrew D. Ludlow, M. H. G. de Miranda +5 · 2 citations
Decision Sciences · Physics and Astronomy · #Advanced Fiber Laser Technologies #Advanced Frequency and Time Standards #Beat (acoustics) #Computer science #Fiber #Instability #Jitter #Laser #Laser linewidth #Materials science #Optical fiber #Optics #Phase (matter) #Phase noise #Physics #Scientific Measurement and Uncertainty Evaluation #Telecommunications #physics.atom-ph #physics.optics
paper · pdf · doi:10.1103/physrevlett.99.153601
published as Phys. Rev. Lett. 99, 153601 (2007). · 4 pages, 4 figures
arxiv created 2007/07/01 · openalex publication_date 2007/10/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The phase coherence of an ultrastable optical frequency reference is fully maintained over actively stabilized fiber networks of lengths exceeding 30 km. For a 7-km link installed in an urban environment, the transfer instability is 6 x 10-18 at 1 s. The excess phase noise of 0.15 rad, integrated from 8 mHz to 25 MHz, yields a total timing jitter of 0.085 fs. A 32-km link achieves similar performance. Using frequency combs at each end of the coherent-transfer fiber link, a heterodyne beat between two independent ultrastable lasers, separated by 3.5 km and 163 THz, achieves a 1-Hz linewidth.