[1] [1] Jiang Y Y, Ludlow A D, Lemke N D, et al.. Making optical atomic clocks more stable with 10-16 level laser stabilization[J]. Nature Photonics, 2011, 5(3): 158-161.

[2] [2] Bloom B J, Nicholson T L, Williams J R, et al.. An optical lattice clock with accuracy and stability at the 10-18 level[J]. Nature, 2014, 506(7486): 71-75.

[3] [3] Wang Yiqiu. Thinking about the constraction of an independent Chinese time and frequency system[J]. Journal of Astronautic Metrology and Measurement, 2004, 24(1): 1-10.

[4] [4] Li Delong, Cheng Qingming, Zhang Baofu, et al.. Research on the impact of optical fiber link delay fluctuation on frequency transfer stabilities[J]. Laser & Optoelectronics Progress, 2014, 51(1): 010602.

[5] [5] Wu Lei, Wu Guiling, Shen Jianguo, et al.. Design and fabrication of wavelength continuous tunable fiber true-time-delay lines with wide dynamic range[J]. Optical Fiber & Electric Cable and Their Applications, 2012(3): 15-17.

[6] [6] Gao C, Wang B, Chen W L, et al.. Fiber-based multiple-access ultrastable frequency dissemination[J]. Optics Letters, 2012, 37(22): 4690-4692.

[7] [7] Chen W, Liu Q, Cheng N, et al.. Joint time and frequency dissemination network over delay-stabilized fiber optic links[J]. IEEE Photonics Journal, 2015, 7(3): 7901609.

[8] [8] Lopez O, Amy-Klein A, Daussy C, et al.. 86-km optical link with a resolution of 2×10-18 for RF frequency transfer[J]. European Physical Journal D, 2008, 48(1): 35-41.

[9] [9] Chen W, Xu D, Cheng N, et al.. Fiber based radio frequency dissemination scheme to multiple users[C]. China Satellite Navigation Conference, 2015, 3: 379-387.

[10] [10] Cheng Nan, Chen Wei, Liu Qin, et al.. Time synchronization technique for joint time and frequency transfer via optical fiber[J]. Chinese J Lasers, 2015, 42(7): 0705002.

[11] [11] Cheng N, Chen W, Liu Qin, et al.. Joint transfer of time and frequency signals and multi-point synchronization via fiber network[J]. Chinese Physics B, 2016, 25(1): 014206.

[12] [12] Olsson N A. Lightwave systems with optical amplifiers[J]. Journal of Lightwave Technology, 1989, 7(7): 1071-1082.

[13] [13] Wood T H, Linke R A, Kasper B L, et al.. Observation of coherent Rayleigh noise in single-source bidirectional optical fiber systems[J]. Journal of Lightwave Technology, 1988, 6(2): 346-352.

[14] [14] Liu Q, Chen W, Cheng N, et al.. Bi-directional erbium-doped fiber amplifiers used in joint frequency and time transfer based on wavelength division multiplexing technology[J]. Chinese Optics Letters, 2015, 13(11): 110601.

[15] [15] Kikuchi K. Effect of l/f-type FM noise on semiconductor-laser linewidth residual in high-power limit[J]. IEEE Journal of Quantum Electronics, 1989, 25(4): 684-688.

[16] [16] Newbury N R, Williams P A, Swann W C. Coherent transfer of an optical carrier over 251 km[J]. Optics Letters, 2007, 32(21): 3056-3058.

[17] [17] Lau K Y, Lutes G F, Tjoelker R L. Ultra-stable RF-over-fiber transport in NASA antennas, phased arrays and radars[J]. Journal of Lightwave Technology, 2014, 32(20): 3440-3451.