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Multi-access fiber-optic time dissemination with bidirectional optical-electrical-optical nodes.

Ying Liu1, Guiling Wu1, Hao Zhang1

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

The Review of Scientific Instruments
|July 3, 2020
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Summary

This study introduces multi-access time dissemination using bidirectional optical-electrical-optical (BOEO) nodes for ultra-long haul fiber optic networks. The novel approach achieves high time synchronization stabilities over 350 km fiber links.

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Area of Science:

  • Optical Communications
  • Metrology
  • Network Engineering

Background:

  • Accurate time dissemination is crucial for modern communication networks and scientific applications.
  • Existing fiber-optic time dissemination methods face challenges with signal degradation and noise over long distances.
  • The need for robust and scalable time synchronization solutions in ultra-long haul networks is increasing.

Purpose of the Study:

  • To propose and demonstrate a novel multi-access time dissemination scheme using bidirectional optical-electrical-optical (BOEO) nodes.
  • To enable simultaneous time signal extraction and signal amplification over a single fiber using the same wavelength.
  • To evaluate the performance and stability of the proposed system for ultra-long haul fiber-optic time dissemination.

Main Methods:

  • Development of bidirectional optical-electrical-optical (BOEO) nodes capable of amplification, isolation, and time signal extraction.
  • Implementation of bidirectional time division multiplexing transmission over a single fiber.
  • Experimental demonstration of the multi-access time dissemination apparatus with two BOEO nodes and a 350 km main fiber link.

Main Results:

  • Achieved time deviation stabilities of 23.2 ps (1 s) and 3.8 ps (10^5 s) for the main link.
  • Demonstrated time deviation stabilities of 24.3 ps (1 s) and 1.3 ps (10^5 s) for access node 1 (AN1).
  • Recorded time deviation stabilities of 23.9 ps (1 s) and 2.9 ps (10^5 s) for access node 2 (AN2).

Conclusions:

  • The proposed multi-access time dissemination scheme with BOEO nodes is effective for ultra-long haul fiber-optic applications.
  • BOEO nodes successfully function as amplifiers, isolators, and time dissemination nodes, enhancing signal quality and synchronization.
  • The experimental results provide a foundation for developing future ultra-long haul fiber-optic time dissemination systems.