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Performance of digital servos in an optical frequency transfer network.

Liang Hu1, Ruimin Xue1, Guiling Wu1

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

The Review of Scientific Instruments
|July 10, 2021
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Summary

Flexible digital servos stabilize optical fiber links, interferometer temperature, and light polarization for high-precision optical frequency transfer. This digital control system offers a low-cost, reliable alternative to analog methods.

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Area of Science:

  • Physics
  • Optical Engineering
  • Control Systems

Background:

  • Optical frequency transfer is crucial for metrology and communication.
  • Existing analog systems face limitations in cost, complexity, and reliability.
  • Stabilization of optical fiber links, temperature, and polarization is essential for precision.

Purpose of the Study:

  • To demonstrate the efficacy of flexible digital servos for stabilizing key parameters in optical frequency transfer.
  • To evaluate the performance of a fully digital optical frequency transfer system.
  • To provide a pathway for developing cost-effective and reliable optical frequency transfer solutions.

Main Methods:

  • Utilized three types of flexible digital servos for distinct stabilization tasks.
  • Implemented a digital servo with an acousto-optic modulator and voltage-controlled oscillator for fiber noise cancellation.
  • Employed digital servos for precise interferometer temperature control and polarization stabilization.

Main Results:

  • Achieved high phase detection range (∼2^10π radians) and low cycle-slip rate in a 62 km fiber link.
  • Stabilized interferometer temperature to within 0.01 K.
  • Enhanced data uptime from 85.5% to 99.9% through polarization control.
  • Demonstrated performance comparable to existing analog systems.

Conclusions:

  • The digital servos are sufficient for high-precision optical frequency transfer.
  • The fully digital approach offers a low-cost, low-complexity, and high-reliability alternative.
  • This method provides guidance for future optical frequency transfer system development.