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We report on the realization of an optical phase noise cancellation technique by passively embedding the optical phase information into a radio frequency (RF) signal and shifting the optical frequency with the amount of phase noise…

Instrumentation and Detectors · Physics 2020-07-30 Liang Hu , Xueyang Tian , Guiling Wu , Jianping Chen

We present a technique for coherence transfer of laser light through a branching fiber link, where the optical phase noise induced by environmental perturbations via the fiber link is passively compensated by remote users without the…

Instrumentation and Detectors · Physics 2021-08-04 Ruimin Xue , Liang Hu , Jianguo Shen , Jianping Chen , Guiling Wu

Timescale comparison between optical atomic clocks over ground-to-space and terrestrial free-space laser links will have enormous benefits for fundamental and applied science, from measurements of fundamental constants and searches for dark…

We describe and experimentally evaluate a stabilized radio-frequency transfer technique that employs optical phase sensing and optical phase actuation. This technique can be achieved by modifying existing stabilized optical frequency…

Instrumentation and Methods for Astrophysics · Physics 2018-02-14 David Gozzard , Sascha Schediwy , Richard Whitaker , Keith Grainge

In this work we demonstrate for the first time that it is possible to transfer simultaneously an ultra-stable optical frequency and a precise and accurate timing over 540 km using a public telecommunication optical fiber networks with…

We demonstrate the long-distance transmission of an ultra-stable optical frequency derived directly from a state-of-the-art optical frequency standard. Using an active stabilization system we deliver the frequency via a 146 km long…

Optics · Physics 2016-04-13 G. Grosche , O. Terra , K. Predehl , R. Holzwarth , B. Lipphardt , F. Vogt , U. Sterr , H. Schnatz

The transfer of high-precision optical frequency signals over free-space links, particularly between ground stations and satellites, will enable advances in fields ranging from coherent optical communications and satellite Doppler ranging…

Instrumentation and Detectors · Physics 2018-09-12 David Gozzard , Sascha Schediwy , Benjamin Stone , Michael Messineo , Michael Tobar

We report a technique for coherence transfer of laser light through a fiber link, where the optical phase noise induced by environmental perturbation via the fiber link is compensated by remote users with passive phase noise correction,…

Optics · Physics 2020-07-30 Liang Hu , Xueyang Tian , Guiling Wu , Mengya Kong , Jianguo Shen , Jianping Chen

We describe a fiber-optic solution for simultaneous distribution of all signals generated at todays most advanced time and frequency laboratories, i.e. an ultrastable optical reference frequency derived from an optical atomic clock, a radio…

Applied Physics · Physics 2017-06-07 P. Krehlik , H. Schnatz , L. Sliwczynski

We performed a two-way remote optical phase comparison on optical fiber. Two optical frequency signals were launched in opposite directions in an optical fiber and their phases were simultaneously measured at the other end. In this…

We report on the realization of delivering coherent optical frequency to multiple places based on passive phase noise cancellation over a bus topology fiber network. This technique mitigates any active servo controller on the main fiber…

Instrumentation and Detectors · Physics 2021-04-07 Liang Hu , Ruimin Xue , Xueyang Tian , Guiling Wu , Jianping Chen

We present a stabilized microwave-frequency transfer technique that is based on optical phase-sensing and optical phase-actuation. This technique shares several attributes with optical-frequency transfer and therefore exhibits several…

Instrumentation and Detectors · Physics 2017-06-12 Sascha Schediwy , David Gozzard , Simon Stobie , Jocias Malan , Keith Grainge

The realization of ultra stable optical frequency transmission through fiber networks is critical for advancing global optical frequency standards and enabling applications such as redefining the second in the International System of Units,…

We demonstrate the distribution of single-photon-level pulses from a mode-locked laser source over a phase-stable fiber link, achieving an optical timing jitter of less than 100 as over 10 minutes of data accumulation. This stability…

Free-space optical (FSO) communications has the potential to revolutionize wireless communications due to its advantages of inherent security, high-directionality, high available bandwidth and small physical footprint. The effects of…

Signal Processing · Electrical Eng. & Systems 2021-01-22 Benjamin P. Dix-Matthews , David R. Gozzard , Skevos F. E. Karpathakis , Charles T. Gravestock , Sascha W. Schediwy

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…

We report an optical link of 540 km for ultrastable frequency distribution over the Internet fiber network. The stable frequency optical signal is processed enabling uninterrupted propagation on both directions. The robustness and the…

We introduce a simple and robust scheme for optical frequency transfer of an ultra-stable source light field via an optical frequency comb to a field at a target optical frequency, where highest stability is required, e.g. for the…

Optical fiber links have demonstrated their ability to transfer the ultra-stable clock signals. In this paper we propose and demonstrate a new scheme to transfer both time and radio frequency with the same wavelength based on coherent…

Signal Processing · Electrical Eng. & Systems 2020-02-19 Jialiang Wang , Chaolei Yue , Yueli Xi , Yanguang Sun , Nan Cheng , Fei Yang , Mingyu Jiang , Jianfeng Sun , Youzhen Gui , Haiwen Cai

During the last years the transfer of frequency signals through optical fibers has shown ultra low instabilities in various configurations. The outstanding experimental results of such point-to-point connections is motivation to develop a…

Optics · Physics 2019-10-25 M. Rost , M. Fujieda , D. Piester
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