High‑Precision Time Calibration for Cascaded Time‑Frequency Transmission of 515.66 km Long Field Optical Fiber Links

Zhicheng Jin; Shenhui Xue; Zhiyuan Xu; Fei Yang; Kang Ying; Youzhen Gui

doi:10.3788/CJL240642

Chinese Journal of Lasers, Volume. 51, Issue 22, 2206005(2024)

High‑Precision Time Calibration for Cascaded Time‑Frequency Transmission of 515.66 km Long Field Optical Fiber Links

Zhicheng Jin^1,3,5, Shenhui Xue², Zhiyuan Xu^1,3,5, Fei Yang^1,4, Kang Ying^1,4, and Youzhen Gui^1,3,5、*

¹Wang Zhijiang Innovation Center for Laser, Aerospace Laser Technology and System Department, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Beijing Satellite Navigation Center, Beijing 100094, China

³Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China

⁴Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

⁵Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(8)

Fig. 1. 515.66 km (transmission distance) time-frequency simultaneous transmission system diagram

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Fig. 2. Link variation of open-loop delay

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Fig. 3. Relative phase noise of 100 MHz frequency signal in open loop and closed loop states

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Fig. 4. Time-frequency transmission performance in open loop and closed loop states. (a) ADEV of 100 MHz frequency signal;

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Fig. 5. Schematic of cascade system time calibration

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Table 1. Actual link length and loss of each 515.66 km (transmission distance) segment

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Table 1. Actual link length and loss of each 515.66 km (transmission distance) segment

Start of link	End of link	Link length /km	Link attenuation /dB
Tsinghua university	Beijing Yizhuang	79.79	21.95
Beijing Yizhuang	Niutuo service area	83.93	21.12
Niutuo service area	Xiongxian east service area	28.15	7.20
Xiongxian east service area	Xushui west service area	65.96	13.85

Table 2. 515.66 km link delay calibration results
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Table 2. 515.66 km link delay calibration results
Link Calibration value Measured value Difference between calibration value and measured value
AB 1723405723.0 1723405710.0 13.00
BC 991813354.4 991813342.1 12.30
AC 2715214105.0 2715214075.1 29.90

Table 3. Calibration uncertainty estimation

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Table 3. Calibration uncertainty estimation

Uncertainty source	Sensitivity coefficient	Standard uncertainty	Uncertainty estimation
$τ_{f o r w a r d}$	1.00	8.0 ps^a	8.00 ps
$τ_{r o u n d}$	0.50	8.0 ps	4.00 ps
$λ_{f} - λ_{b}$	$0.5 D \cdot L$	0.5 pm^a	2.20 ps^b
$D \cdot L$	$0.5 (λ_{f} - λ_{W})$	5.0 ps/nm^b	2.00 ps^c
$τ_{P M D}$	$0.5 \cdot \sqrt[]{2}$	2.2 ps^c	1.10 ps^d

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Zhicheng Jin, Shenhui Xue, Zhiyuan Xu, Fei Yang, Kang Ying, Youzhen Gui. High‑Precision Time Calibration for Cascaded Time‑Frequency Transmission of 515.66 km Long Field Optical Fiber Links[J]. Chinese Journal of Lasers, 2024, 51(22): 2206005

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