Absolutely Consistent Fiber-Optic Phase Synchronization Based On Fixed-Phase-Reference Optical Active Compensation

An absolutely consistent fiber-optic phase synchronization scheme based on fixed-phase-reference optical active compensation is proposed. By measuring the time interval of time pulse and the phase difference of frequency signal, and then using the optical delay line to compensate the phase change in...

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Bibliographic Details
Published in:IEEE photonics journal 2021-06, Vol.13 (3), p.1-11
Main Authors: Wu, Rui, Yang, Fei, Sun, Yanguang, Wei, Fang, Gui, Youzhen, Ding, Yaqian, Cai, Haiwen
Format: Article
Language:English
Subjects:
Coherence
Compensation
Delay lines
Fiber optics
optical active compensation
Optical fiber networks
Optical fibers
Optical variables measurement
Optics
phase coherence
Phase shift
Phase synchronization
Radar networks
Real-time systems
Stability
stability and consistency
Synchronism
Time measurement
Time synchronization
Time-frequency analysis
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Summary:An absolutely consistent fiber-optic phase synchronization scheme based on fixed-phase-reference optical active compensation is proposed. By measuring the time interval of time pulse and the phase difference of frequency signal, and then using the optical delay line to compensate the phase change in real time according to a fixed phase reference, the phase period ambiguity and the phase-lock control initial randomness are eliminated, realizing a stable and repeatable fixed phase difference between different sites. Then the phase synchronization performances of stability and absolute consistence have been demonstrated through experiments in different scenarios. The phase difference fluctuation within 10000 s is only ±0.0006 rad, showing an ultra-high stability. Under the total of 5 different operations, including the signal source restart, system restart, adding 20 m additional fiber, adding 1 km additional fiber, and adding 2 km additional fiber, the maximum inconsistency of the mean phase difference is about 1% of one full cycle. The proposed and verified absolutely consistent phase synchronization method can well maintain the coherence in transferring frequency signal, having important application prospects in radar network and other time-frequency-phase synchronization-based coherent detection.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2021.3075565