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Related Concept Videos

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length, the...
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,...
Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
Discrete-time Fourier transform01:26

Discrete-time Fourier transform

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...
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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Related Experiment Video

Updated: Jun 20, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Quasi-Light-Storage based on time-frequency coherence.

Stefan Preussler1, Kambiz Jamshidi, Andrzej Wiatrek

  • 1Deutsche Telekom Hochschule für Telekommunikation Leipzig, D-04277 Leipzig, Germany. stefan.preuszler@hft-leipzig.de

Optics Express
|September 3, 2009
PubMed
Summary

We demonstrate a novel method for distortion-free quasi storage of light using spectral-temporal coherence. This technique allows for tunable delays of optical pulse patterns, integrating seamlessly with existing fiber optic systems.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quasi-light Storage for Optical Data Packets
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Published on: February 6, 2014

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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

Area of Science:

  • Optics and Photonics
  • Quantum Information Science

Background:

  • Optical data storage and retrieval are crucial for modern communication systems.
  • Maintaining signal integrity during storage and delay is a significant challenge.

Purpose of the Study:

  • To present a novel method for distortion-free quasi storage of light.
  • To demonstrate tunable delay of optical pulse sequences using spectral-temporal coherence.

Main Methods:

  • Utilizing the coherence between the spectrum and time representation of pulse sequences.
  • Implementing the system using standard optical telecommunication components.

Main Results:

  • Achieved distortion-free quasi storage of light.
  • Demonstrated tunable delay of 5-bit patterns with bit durations from 500 ps to 38 ns.
  • Verified operation across the entire transparency range of optical fibers.

Conclusions:

  • The proposed method offers a robust solution for optical data buffering.
  • The system's reliance on standard components facilitates easy integration into existing infrastructure.