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Related Concept Videos

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

Time and frequency -Domain Interpretation of Phase-lead Control

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.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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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Sinusoidal Sources01:18

Sinusoidal Sources

Direct current (DC) refers to an electric current that flows in a single direction, maintaining a constant polarity. This is in contrast to alternating current (AC), which periodically changes its direction and magnitude. AC forms the backbone of modern electricity transmission and distribution systems due to its efficient long-distance transmission capabilities.
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Graphical and Analytic Representation of Sinusoids01:20

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Generation of Three-Phase Voltage01:21

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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
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Phase-lead and Phase-lag Controllers01:22

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Related Experiment Video

Updated: May 13, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Flattened comb generation using only phase modulators driven by fundamental frequency sinusoidal sources with small

Junwen Zhang1, Jianjun Yu, Nan Chi

  • 1Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China.

Optics Letters
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

We developed a simple method to create stable optical subcarriers using phase modulators. This technique generates 21 flattened comb tones with low power variation, proving effective for high-speed optical communications.

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Last Updated: May 13, 2026

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Area of Science:

  • Photonics
  • Optical Communications
  • Signal Processing

Background:

  • Generating stable and flattened optical subcarriers is crucial for high-capacity optical communication systems.
  • Existing methods often involve complex setups or high insertion losses.

Purpose of the Study:

  • To propose and demonstrate a simple, low-loss scheme for generating flattened optical subcarriers.
  • To achieve phase-insensitive and stable subcarrier generation.

Main Methods:

  • Utilizing phase modulators driven by fundamental frequency sinusoidal sources.
  • Introducing a small frequency offset in the second stage for phase insensitivity.
  • Conducting theoretical, numerical, and experimental analyses.

Main Results:

  • Successfully generated 21 stable comb tones with 25 GHz frequency spacing.
  • Achieved a power difference of less than 3 dB among the comb tones.
  • Demonstrated the feasibility with a 160.8 Gb/s polarization-division-multiplexing quadrature-phase-shift-keying signal.

Conclusions:

  • The proposed scheme offers a simple and effective method for generating flattened optical subcarriers.
  • The generated subcarriers are stable, phase-insensitive, and suitable for high-speed optical data transmission.