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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,...
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...
Gain01:15

Gain

Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
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...
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...

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Related Experiment Video

Updated: May 11, 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

Fast, optically controlled Kerr phase shifter for digital signal processing.

R B Li1, L Deng, E W Hagley

  • 1Physical Measurements Laboratory, National Institute of Standard and Technology, Gaithersburg, Maryland 20899, USA.

Optics Letters
|May 2, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed an optically controlled Kerr phase shifter using 85Rb vapor. This device enables digital manipulation of light signals for high-speed applications.

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Last Updated: May 11, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Published on: March 20, 2017

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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

Published on: January 28, 2019

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Information Science

Background:

  • Optical phase shifters are crucial for manipulating light signals in various applications.
  • Controlling phase shifts with high precision and speed is a key challenge in optical signal processing.

Purpose of the Study:

  • To demonstrate an optically controlled Kerr phase shifter using room-temperature 85Rb vapor.
  • To explore the digital manipulation of encoded light fields for advanced optical processing.

Main Methods:

  • Utilized a Raman gain scheme with 85Rb vapor at room temperature.
  • Employed an unbalanced Mach-Zehnder interferometer for digital manipulation of encoded light fields.

Main Results:

  • Observed phase shifts ranging from zero to π relative to a reference wave.
  • Successfully demonstrated gated operations and versatile digital manipulation of encoded signal light.

Conclusions:

  • The developed Kerr phase shifter offers precise optical control over phase shifts.
  • The scheme shows potential for high-speed, full manipulation of digitized signal fields, paving the way for future optical technologies.