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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.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
Control System Problem01:21

Control System Problem

In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires careful...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...

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Related Experiment Video

Updated: Jun 9, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Polarization-effect controllability in recirculating delay-line systems.

B A Ferguson, C L Chen

    Applied Optics
    |August 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study analyzes polarization in fiber-recirculating delay lines, demonstrating control over polarization eigenmode structure using birefringence control devices. This enables nondestructive testing for splice-misalignment and develops new polarization control elements.

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    Published on: February 28, 2016

    Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

    Area of Science:

    • Optical Engineering
    • Fiber Optics
    • Polarization Optics

    Background:

    • Fiber-recirculating delay lines are crucial optical components.
    • Understanding and controlling polarization in these systems is essential for performance.
    • Existing methods for polarization analysis may lack comprehensive controllability.

    Purpose of the Study:

    • To conduct a complete polarization analysis of fiber-recirculating delay lines.
    • To investigate and demonstrate the controllability of the polarization eigenmode structure.
    • To develop methods for nondestructive testing and in-line polarization control.

    Main Methods:

    • Detailed polarization analysis of the fiber-recirculating delay line system.
    • Development of a method for analyzing the polarization eigenmode structure.
    • Utilizing in-line birefringence control devices (e.g., fiber squeezers) to manipulate eigenmode structure.
    • Experimental demonstration of theoretical models.

    Main Results:

    • A method for analyzing general system polarization eigenmode structure is presented.
    • Eigenmode structure of normally birefringent fiber systems is controllable via in-line devices.
    • A nondestructive test for splice-misalignment angle was developed and demonstrated.
    • A recirculating delay-line filter was developed as an in-line polarization control element.

    Conclusions:

    • Controllability of polarization eigenmode structure in fiber-recirculating delay lines is achievable.
    • In-line birefringence control offers practical applications in optical systems.
    • The developed methods provide effective tools for system analysis and performance enhancement.