Weak-Light Phase-Locking Time Delay Interferometry with Optical Frequency Combs

Xu, Mingyang; Wu, Hanzhong; Liang, Yurong; Luo, Dan; Wang, Panpan; Tan, Yu-Jie; Shao, Cheng-Gang

doi:10.3390/s22197349

Cited by 2 publications

(1 citation statement)

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“…并设计实验验证弱光锁相中主要的噪声来源 [15] . 弱光锁相理论的发展不仅为技术本身提供依据, 更对LISA 和太极计划(TAJI)的时延干涉(TDI)仿真建模提供了依据 [16] . 除了光路和电路上的改进, 最近有学者提出通过结合光频梳采用特定的TDI组合可以有效地降低弱光锁相噪声, 简化后处理 [17] 只要频率差在相位计 [18] 的拉入范围内, 相位计仍然能够跟踪外差信号.…”

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Weak-light phase locking aided by frequency division phase meter for intersatellite laser interferometry

Le,

Mu,

et al. 2023

Acta Phys. Sin.

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Weak light phase locking is an important part of intersatellite laser interference ranging. Phase locking loop is used to track the phase of heterodyne interference optical signal. Due to shot noise, laser frequency and other kinds of noise, there is a phase difference between the internal PLL local oscillator and the heterodyne signal. while the phase detection range of the PLL is only one period. If the phase difference exceeds the phase detection range at a certain time, the local oscillator may enter the wrong operating point under feedback regulation, resulting in cycle clip, which leads to subsequent phase reconstruction errors In this paper, a cycle clip diagnosis method based on the detection background of gravitational waves is proposed. Based on the original PLL, an auxiliary frequency phase divider with larger phase detection range is introduced, which can provide a judgment basis for whether the cycle clip occurs in the PLL. In this paper, a digital low-light phaselocked loop model is established to evaluate the influence of various noises. The theoretical spectral density of the error phase is given according to the two main kinds of noise (laser phase noise and particle noise). Considering the limited detection range of PLL, large error phase may lead to cycle jump, making the PLL work at the wrong locking point. By frequency division phase range smaller phase meter to solve the problem, first the input heterodyne sine signal into in-phase square wave number after frequency division as TDC input all the way, and will provide the cumulative phaselocked loop phase in addition to N, the output phase as TDC one input square-wave signal, rising through the calculation of TDC along time to get two signal phase difference. Based on the theory of phase-locked loop and noise, the theoretical model of frequency division phase meter is established. The simulation results show that the frequency division phase meter can realize a wide range of phase detection under the current theoretical framework and has the ability to judge the cycle jump of weak light phase locking. It can be used in the weak light phase locking task represented by LISA.

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