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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,...
Discrete-time Fourier transform01:26

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The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
One of the notable...

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Related Experiment Video

Updated: Jun 8, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

High bandwidth, optical fiber delay line multichannel digital correlator.

D D Sampson, W T Dove, D A Jackson

    Applied Optics
    |September 11, 2010
    PubMed
    Summary

    We developed a multichannel digital correlator using passive optical fiber delay lines, enabling higher real-time bandwidths than electronic systems. This optical approach offers significant advancements for high-speed signal processing applications.

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    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

    Related Experiment Videos

    Last Updated: Jun 8, 2026

    Quasi-light Storage for Optical Data Packets
    07:45

    Quasi-light Storage for Optical Data Packets

    Published on: February 6, 2014

    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

    Area of Science:

    • Photonics
    • Electrical Engineering
    • Signal Processing

    Background:

    • Current electronic correlators face limitations in real-time bandwidth.
    • High-speed digital correlation is crucial for various scientific and engineering fields.

    Purpose of the Study:

    • To implement and demonstrate a multichannel digital correlator using passive optical fiber delay lines.
    • To explore the potential of optical methods for achieving higher bandwidths in digital correlation.

    Main Methods:

    • Utilized passive optical fiber delay lines for multichannel signal correlation.
    • Employed laser diodes and optoelectronic single-bit AND multipliers for digital correlation.
    • Tested configurations with eight channels at 100 MHz and four channels at 500 MHz sample rates.

    Main Results:

    • Achieved higher real-time bandwidths compared to purely electronic correlators.
    • Demonstrated digital correlation with eight channels at 100 MHz and four channels at 500 MHz.
    • Identified suitability of low-cost 800 nm optoelectronics for up to 1 GHz sample rates.

    Conclusions:

    • Passive optical fiber delay lines offer a viable path to significantly enhance digital correlator bandwidth.
    • The developed optical correlator shows promise for applications requiring high-speed signal processing.
    • Future all-optical architectures could lead to more compact and efficient correlator designs.