Atmospheric transfer of a radio-frequency clock signal with a diode laser

Nie, Jinsong; Yang, Lin; Duan, Lingze

doi:10.1364/ao.51.008190

Cited by 14 publications

(5 citation statements)

References 17 publications

(32 reference statements)

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“…In order to improve precision, methods of time frequency transfer based on space laser develop rapidly. Coherent optical phase time frequency transfer which includes optical frequency transfer method and radio over fiber transfer method, it could realize frequency stability of 7×10 -15 /1000s but it only supports frequency transfer and is constrained by long range transmission [2][3] . Optical bi-directional time frequency transfer based on optical comb could acquire 1×10 -18 /1000s frequency stability and 4fs /60s time stability but its technology and implementation are complex [4] .…”

Section: Introductionmentioning

confidence: 99%

High precision time-frequency transfer based on all-digital coherent demodulation

Zhu

Lu²,

Sun³

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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With the development of space laser communication, it begins to apply in various scenarios and high-precision time frequency transfer is the important one. In this paper, method of high-precision time-frequency transfer is proposed based on all-digital coherent demodulation. The parallel timing synchronization algorithm in all-digital coherent demodulation is described and its process is implemented in FPGA. The phase time could be acquired in time when operating timing synchronization in BPSK coherent laser communication experiment. Through phase unwrapping, the phase time becomes continuous. Then time transfer precision and frequency stability could be calculated and assessed by standard deviation and Allan variance separately. The phase time precision of below 5ps and frequency stability of below 10-14 /1000s could be realized when the communication rate is 1.25Gbps. Further, the time-frequency precision could be improved after dealing with phase time using linear Kalman filter.

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Section: Introductionmentioning

confidence: 99%

High precision time-frequency transfer based on all-digital coherent demodulation

Zhu

Lu²,

Sun³

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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“…Gollapalli. RP has used femtosecond optical frequency comb and semiconductor laser to carry out 60 m outdoor atmospheric frequency transmission and analyzed the factors that cause stability degradation through the experimental results [5]- [7]. Giorgetta.…”

Section: Introductionmentioning

confidence: 99%

Stable Radio Frequency Transfer Over Free Space by Passive Phase Correction

et al. 2019

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The frequency transmission over free-space link can effectively overcome the dependence of existing optical fiber time-frequency transmission technology on optical fiber network. In this paper, we demonstrate a passive phase correction technique over a 124 m long indoor atmospheric radio frequency (RF) dissemination. This scheme simplifies the system, and suppresses the effects of Rayleigh backscattering. We verify the feasibility of the scheme by transmitting 1 GHz RF signals over the atmospheric link. After timing fluctuation compensation, the relative frequency stability can reach 6.8 × 10 −15 for 1 s and 3.2 × 10 −17 for 10 3 s, the RMS timing fluctuation is 186 fs in 5000 s. It can be proved that the scheme is very effective in eliminating phase noise caused by atmospheric link.

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“…Most of the related experiments made use of free space laser. [12][13][14][15] For example, F. R. Giorgetta et al developed an optical two-way time and frequency transfer (TWTFT) method which can exchange optical pulse between coherent frequency combs, and they achieved a residual instability below 1 × 10 −18 at 1000 s. 15 However, there are some limitations in optical time and frequency dissemination via free space. The transmission quality is highly affected by weather conditions, and it is hard to maintain an effective transfer link on a large scale because of the small beam divergence, complex operations and environmentally sensitive equipment.…”

Section: Introductionmentioning

confidence: 99%

Portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization

Miao

Wang

Bai

et al. 2015

Review of Scientific Instruments

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Frequency dissemination and synchronization in free space plays an important role in global navigation satellite system, radio astronomy and synthetic aperture radar. In this paper, we demonstrated a portable radio frequency dissemination scheme via free space using microwave antennas. The setup has a good environment adaptability and high dissemination stability. The frequency signal was disseminated at different distances ranging from 10 to 640 m with a fixed 10 Hz locking bandwidth, and the scaling law of dissemination stability on distance and averaging time was discussed. The preliminary extrapolation shows that the dissemination stability may reach 1 × 10 −12 /s in ground-to-satellite synchronization, which far exceeds all present methods, and is worthy for further study.[http://dx

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Atmospheric transfer of a radio-frequency clock signal with a diode laser

Cited by 14 publications

References 17 publications

High precision time-frequency transfer based on all-digital coherent demodulation

High precision time-frequency transfer based on all-digital coherent demodulation

Stable Radio Frequency Transfer Over Free Space by Passive Phase Correction

Portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization

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