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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Updated: May 31, 2025

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An Approach to Reduce Tuning Sensitivity in the PIC-Based Optoelectronic Oscillator by Controlling the Phase Shift in

Vladislav Ivanov1, Ivan Stepanov1, Grigory Voronkov1

  • 1Research Laboratory "Sensor Systems Based on Integrated Photonics Devices", Ufa University of Science and Technology, 32, Z. Validi St., Ufa 450076, Russia.

Micromachines
|January 25, 2025
PubMed
Summary

This study introduces a novel method for continuous frequency control in optoelectronic oscillators (OEOs) using integrated photonics. This innovation enhances microwave signal generation accuracy and flexibility for communication and sensing systems.

Keywords:
frequency tuningoptoelectronic oscillatoroscillationsphotonic integrated circuit

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Area of Science:

  • Photonics and Optics
  • Microwave Engineering
  • Signal Processing

Background:

  • Radio photonic technologies, particularly optoelectronic oscillators (OEOs), offer solutions for microwave frequency synthesis challenges.
  • OEOs provide low phase noise and high frequencies but suffer from significant frequency tuning steps.
  • Existing methods lack the fine-tuning precision required for advanced communication and sensing applications.

Purpose of the Study:

  • To present a novel approach for continuous frequency control of optoelectronic oscillators (OEOs) using integrated photonics.
  • To develop an analytical model for calculating OEO output frequency, considering nonlinear errors and various control schemes.
  • To explore the implementation of integrated optical delay lines for precise frequency tuning.

Main Methods:

  • Tuning an integrated optical delay line within the OEO feedback loop.
  • Developing an analytical model to predict OEO output frequency under nonlinear conditions.
  • Simulating Mach-Zehnder interferometer and microring resonator delay lines using thermo-optic and electro-optic effects (Ansys Lumerical).

Main Results:

  • Demonstrated a microring resonator (MRR)-based electro-optical delay line with a tuning sensitivity of 174.5 MHz/V.
  • Achieved a calculated frequency tuning sensitivity as low as 6.98 kHz using a precision digital-to-analog converter (DAC).
  • The proposed method offers enhanced frequency tuning accuracy and flexibility compared to discrete optical components.

Conclusions:

  • The integrated photonics approach enables continuous frequency control of OEOs, overcoming limitations of discrete components.
  • The developed analytical model accurately predicts OEO frequency tuning, accounting for nonlinearities.
  • This technique significantly improves the accuracy and flexibility of microwave signal generation for diverse radio engineering applications.