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Related Concept Videos

Load-frequency control01:28

Load-frequency control

Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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Related Experiment Video

Updated: Jun 20, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

All-fiber acousto-optic frequency shifter.

B Y Kim1, J N Blake, H E Engan

  • 1Edward L. Ginzton Laboratory, W. W. Hansen Laboratories of Physics, Stanford University, Stanford, California 94305, USA.

Optics Letters
|September 5, 2009
PubMed
Summary
This summary is machine-generated.

This study demonstrates an all-fiber-optic frequency shifter using acoustic waves for mode coupling. It achieves high efficiency and sideband suppression, enabling advanced optical signal processing.

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Area of Science:

  • Photonics and Optical Engineering
  • Acousto-Optics
  • Fiber Optics

Background:

  • Optical frequency shifters are crucial components in various photonic applications.
  • Existing methods often involve bulk optics or complex setups.
  • There is a need for compact and efficient fiber-integrated frequency shifting solutions.

Purpose of the Study:

  • To demonstrate a novel all-fiber-optic frequency shifter.
  • To utilize acoustic waves for efficient mode coupling in optical fibers.
  • To achieve high-performance frequency shifting with low power consumption.

Main Methods:

  • Employing mode coupling between LP(01) and LP(11) modes within an optical fiber.
  • Guiding a traveling acoustic flexural wave along the fiber to induce mode coupling.
  • Using single-mode fibers for both input and output to ensure signal integrity.

Main Results:

  • Achieved unity mode-conversion efficiency for continuous-wave (cw) operation.
  • Demonstrated an 8-MHz frequency shift with only 0.25 W of electrical input power.
  • Showcased carrier and image sideband suppression of 15 dB and 35 dB, respectively.

Conclusions:

  • The developed all-fiber-optic frequency shifter offers a compact and efficient solution.
  • High conversion efficiency and excellent sideband suppression are achieved.
  • This technology has potential applications in optical communications and signal processing.