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Related Concept Videos

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,...
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Related Experiment Video

Updated: Jul 6, 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

Spatial phase information transmission through an optical fiber by coherence function synthesis.

Y Teramura, F Kannari

    Applied Optics
    |March 28, 2008
    PubMed
    Summary

    This study demonstrates transmitting spatial phase information using low-coherence light through optical fibers. A novel delay-time division scheme enables multiplexing infinite signal channels for enhanced analog transmission.

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    Area of Science:

    • Optics and Photonics
    • Information Transmission

    Background:

    • Low-coherence light transmission through optical fibers is crucial for data transfer.
    • Spatial phase information encoding presents challenges in maintaining signal integrity.

    Purpose of the Study:

    • To experimentally demonstrate the transmission of one-dimensional spatial phase information using low-coherence light.
    • To explore methods for overcoming limitations in information capacity during fiber propagation.
    • To extend analog transmission capabilities to two-dimensional spatial patterns.

    Main Methods:

    • Utilized space-time conversion with a 4-f Fourier coherence function shaper.
    • Employed time-space conversion with spectral holography for dispersion compensation.
    • Introduced a novel delay-time division multiplexing scheme.

    Main Results:

    • Successfully transmitted one-dimensional spatial phase information through a single-mode optical fiber.
    • Achieved automatic dispersion compensation during fiber propagation via spectral holography.
    • Demonstrated the multiplexing of an infinite number of signal channels, enabling two-dimensional spatial phase pattern transmission.

    Conclusions:

    • Space-time-space conversion with low-coherence light offers a scalable solution for analog optical transmission.
    • The delay-time division scheme overcomes space-time coupling limitations, significantly increasing information capacity.
    • This technique holds potential for advancing high-capacity optical communication systems.