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Related Experiment Video

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Quasi-light Storage for Optical Data Packets
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High-precision two-way optic-fiber time transfer using an improved time code.

Guiling Wu1, Liang Hu1, 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
|November 29, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for precise time transfer over optical fibers using a modified Inter-Range Instrumentation Group (IRIG-B) time code. The enhanced scheme achieves high stability and low uncertainty, crucial for accurate time synchronization.

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Area of Science:

  • Optical Physics
  • Metrology
  • Telecommunications Engineering

Background:

  • Accurate time transfer is critical for distributed systems and scientific experiments.
  • Existing optic-fiber time transfer methods face challenges with signal integrity and environmental noise.
  • The Inter-Range Instrumentation Group (IRIG-B) time code is a standard for time data transmission.

Purpose of the Study:

  • To develop a novel, high-precision two-way optic-fiber time transfer scheme.
  • To improve the robustness and accuracy of time synchronization over optical fiber links.
  • To address limitations of existing time transfer protocols in demanding environments.

Main Methods:

  • Modification of the Inter-Range Instrumentation Group (IRIG-B) time code with increased bit rate and new fields.
  • Development of a dedicated encoder-decoder (codec) with low delay fluctuation (< 27 ps std. dev.).
  • Implementation of a mask technique and combinational logic circuit for synchronization.
  • Experimental verification over fiber links ranging from 2 m to 100 km.

Main Results:

  • Demonstrated stability of less than 35 ps over a 100 km fiber link.
  • Achieved a minimum stability of approximately 2 ps at an averaging time of 1000 s.
  • Quantified time difference uncertainty due to chromatic dispersion below 22 ps over 100 km.
  • Successfully suppressed Rayleigh backscattering effects.

Conclusions:

  • The novel two-way optic-fiber time transfer scheme offers high precision and stability.
  • The modified IRIG-B code and dedicated codec effectively overcome signal degradation challenges.
  • The system is suitable for accurate time synchronization over extended fiber optic networks.