Phase fluctuation compensation for long-term transfer of stable radio frequency over fiber link

Ning, Bo; Du, Peng; Hou, Dong; Zhao, Jianye

doi:10.1364/oe.20.028447

Cited by 22 publications

(15 citation statements)

References 20 publications

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“…The resulting frequency instability for the 2.3 km link is 7.6 × 10 −18 at 1000 s and ultimately reaches 6.5 × 10 −19 at 82,500 s averaging time. This instability level is an order of magnitude improved from the previous comb-based microwave transfer results [5][6][7]. Note that the instability could also reach 1.7 × 10 −18 even without dispersion compensation for the 1 km fiber link.…”

mentioning

confidence: 55%

“…The transfer of microwaves from modulated continuous wave (CW) lasers has recently showed a fractional frequency instability of ∼10 −17 (2 × 10 −17 [3] and 7 × 10 −18 [4]) at 1000 s averaging time and ultimately reached ∼4 − 5 × 10 −19 (5 × 10 −19 [3] and 4 × 10 −19 [4]) at 70,000 s averaging time. The transfer of microwaves by frequency combs, where the microwaves are encoded in the repetition rate and its harmonics, has recently resulted in 4 − 7 × 10 −17 (7 × 10 −17 [5], 4 × 10 −17 [6], 6 × 10 −17 [7]) at 1000 s averaging time and reached 6.6 × 10 −18 [7] at 16,000 s averaging time.…”

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confidence: 99%

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Frequency comb-based microwave transfer over fiber with 7×10^−19 instability using fiber-loop optical-microwave phase detectors

et al. 2014

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We demonstrate a remote microwave/radio frequency (RF) transfer technique based on the stabilization of a fiber link using a fiber-loop optical-microwave phase detector (FLOM-PD). This method compensates for the excess phase fluctuations introduced in fiber transfer by direct phase comparison between the optical pulse train reflected from the remote site and the local microwave/RF signal using the FLOM-PD. This enables sub-fs resolution and long-term stable link stabilization while having a wide timing detection range and less of a demand in fiber dispersion compensation. The demonstrated fractional frequency instability between 2.856 GHz RF oscillators separated by a 2.3 km fiber link is 7.6×10(-18) and 6.5×10(-19) at 1000 and 82,500 s averaging times, respectively.

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confidence: 55%

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confidence: 99%

Frequency comb-based microwave transfer over fiber with 7×10^−19 instability using fiber-loop optical-microwave phase detectors

et al. 2014

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“…In order to attain the highest-possible stability, there is a need to address the effect of fluctuations in the optical-fiber path length (e.g., due to temperature changes or mechanical vibrations). The most commonly used remedy is to measure the round-trip phase and then to suppress the effect of phase fluctuations by either actively altering the fiber length [1,8-10, [13][14][15] or indirectly by electronically pre-compensating the outgoing signal phase/frequency [1,8,9,11,12,16,17,19,20]. In the latter case, the principle of phase conjugation is sometimes used to adjust the outgoing signal phase [1,8,11,17,21,22].…”

Section: Introductionmentioning

confidence: 99%

Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

He¹,

Orr²,

Baldwin³

et al. 2013

Opt. Express

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OSA grants to the Author(s) (or their employers, in the case of works made for hire) the following rights:(a) The right, after publication by OSA, to use all or part of the Work without revision or modification, including the OSAformatted version, in personal compilations or other publications consisting solely of the Author(s') own works, including the Author(s') personal web home page, and to make copies of all or part of the Work for the Author(s') use for lecture or classroom purposes; (b) The right to post and update his or her Work on any internet site (other than the Author(s') personal web home page) provided that the following conditions are met: (i) access to the server does not depend on payment for access, subscription or membership fees; and (ii) any such posting made or updated after acceptance of the Work for publication includes and prominently displays the correct bibliographic data and an OSA copyright notice (e.g. "© 2009 The Optical Society").. Abstract: We demonstrate long-distance (100-km) synchronization of the phase of a radio-frequency reference over an optical-fiber network without needing to actively stabilize the optical path length. Frequency mixing is used to achieve passive phase-conjugate cancellation of fiber-length fluctuations, ensuring that the phase difference between the reference and synchronized oscillators is independent of the link length. The fractional radio-frequency-transfer stability through a 100-km "real-world" urban optical-fiber network is 6 × 10 17 with an averaging time of 10 4 s. Our compensation technique is robust, providing long-term stability superior to that of a hydrogen maser. By combining our technique with the short-term stability provided by a remote, high-quality quartz oscillator, this system is potentially applicable to transcontinental optical-fiber time and frequency dissemination where the optical round-trip propagation time is significant. 723-727 (2010). 14. G. Marra, H. S. Margolis, S. N. Lea, and P. Gill, "High-stability microwave frequency transfer by propagation of an optical frequency comb over 50 km of optical fiber," Opt. Lett. 35(7), 1025-1027 (2010). 15. G. Marra, R. Slavík, H. S. Margolis, S. N. Lea, P. Petropoulos, D. J. Richardson, and P. Gill, "High-resolution microwave frequency transfer over an 86-km-long optical fiber network using a mode-locked laser," Opt. Lett. ©2013 Optical Society of America 36(4),

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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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Phase fluctuation compensation for long-term transfer of stable radio frequency over fiber link

Cited by 22 publications

References 20 publications

Frequency comb-based microwave transfer over fiber with 7×10^−19 instability using fiber-loop optical-microwave phase detectors

Frequency comb-based microwave transfer over fiber with 7×10^−19 instability using fiber-loop optical-microwave phase detectors

Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing

Passive phase correction for stable radio frequency transfer via optical fiber

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