Fiber-based multiple-access ultrastable frequency dissemination

Gao, Chao; Wang, B.; Chen, W. L.; Bai, Yu; Miao, Jing; Zhu, Xi; Li, T. C.; Wang, L. J.

doi:10.1364/ol.37.004690

Cited by 75 publications

(41 citation statements)

References 13 publications

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“…Another possibility is to implement a branching optical fiber network with noise correction at each output end [14]. In this paper, following first implementations on a few-km fiber spools [15][16][17], we demonstrate for the first time a multiple-access frequency dissemination using installed telecommunication fibers of 92 km. Moreover we show that the residual frequency noise at the extraction end is below that at the main link output.…”

Section: Introductionmentioning

confidence: 96%

In-line extraction of an ultrastable frequency signal over an optical fiber link

et al. 2014

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Received Month X, XXXX; revised Month X, XXXX; accepted Month X, XXXX; posted Month X, XXXX (Doc. ID XXXXX); published Month X, XXXX We demonstrate in-line extraction of an ultra-stable frequency signal over an optical link of 92-km of installed telecommunication fibers, following the proposition of G. Grosche in 2010 [1]. We show that the residual frequency noise at the extraction end is noticeably below that at the main link output when the extraction is near the input end, as expected from a simple model of the noise compensation. We obtain relative frequency instabilities, expressed as overlapping Allan deviation, of 8×10 -16 at 1 s averaging time and a few 10 -19 at 1 day. These results are at the state-of-the-art for a link using urban telecommunication fibers. We also propose an improved scheme which delivers an ultra-stable signal of higher power, in order to feed a secondary link. In-line extraction opens the way to a broad distribution of an ultra-stable frequency reference, enabling a wide range of applications beyond metrology.

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Section: Introductionmentioning

confidence: 96%

In-line extraction of an ultrastable frequency signal over an optical fiber link

et al. 2014

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“…One important question [14][15][16][17][18] is how to distribute reference frequencies to many users simultaneously in a cost-effective way. Surprisingly, with one point-to-point connection (such as a long stabilized fiber), we can "tap" this fiber anywhere and locally derive a reference frequency with the same precision as that achieved at the end-point [18].…”

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confidence: 99%

Eavesdropping time and frequency: phase noise cancellation along a time-varying path, such as an optical fiber

Grosche¹

2014

Opt. Lett.

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Single-mode optical fiber is a highly efficient connecting medium, used not only for optical telecommunications but also for the dissemination of ultra-stable frequencies or timing signals. In 1994, Ma, Jungner, Ye and Hall described a measurement and control system to deliver the same optical frequency at two places, namely the two ends of a fiber, by eliminating the "fiber-induced phase-noise modulation, which corrupts high-precision frequency-based applications". We present a simple detection and control scheme to deliver the same optical frequency at many places anywhere along a transmission path, or in its vicinity, with a relative instability of 1 part in 10 19

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“…One method is to actively adjust the optical path by changing the length of the fiber link or the wavelength of the laser source [11][12][13][14][15][16][17][18][19][20][21][22]. The second approach is to pre-compensate the phase variation by introducing a conjugate phase to the RF signal before transmission via a phase shifter, a frequency shifter, or a voltage-controlled oscillator (VCO) [23][24][25][26][27][28][29][30][31][32][33][34][35]. In practical implementations of these methods, the phase variations caused by the changes in the fiber link should be extracted and used to drive the tunable device for phase variation compensation.…”

Section: Introductionmentioning

confidence: 99%

Passive phase correction for stable radio frequency transfer via optical fiber

2015

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The transfer of radio frequency (RF) signal via optical fiber is widely adopted in distributed antenna systems and clock standard disseminating networks. To suppress the phase variation caused by fiber length fluctuation, passive phase correction technique based on frequency mixing has been proved as a promising approach due to its significant advantages over the traditional active compensation technique in terms of complexity, compensation speed, and compensation range. The phase correction can be done either in the transmitter or in the receiver, but it usually requires many stages of electronic mixing and auxiliary microwave signals, which not only increases the cost of the link but also degrades the quality of the transmitted signal. In addition, the effect of chromatic dispersion, polarization mode dispersion, and coherent Rayleigh noise in the optical fiber will further deteriorate the phase noise of the signal after transmission. In this paper, an analytical model for the stable RF transfer system based on passive phase correction is established, and the techniques developed in the last few years in solving the problems of the method are described. Future prospects and perspectives are also discussed.

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Fiber-based multiple-access ultrastable frequency dissemination

Cited by 75 publications

References 13 publications

In-line extraction of an ultrastable frequency signal over an optical fiber link

In-line extraction of an ultrastable frequency signal over an optical fiber link

Eavesdropping time and frequency: phase noise cancellation along a time-varying path, such as an optical fiber

Passive phase correction for stable radio frequency transfer via optical fiber

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