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Related Concept Videos

Impulse01:13

Impulse

According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the total...
Impulse Response01:17

Impulse Response

The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
Impulse-Momentum Theorem00:49

Impulse-Momentum Theorem

The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
By writing Newton's second law of motion in terms of the momentum of an object and the external force acting on it, and simultaneously using the definition of the impulse vector, it can be shown that the total impulse on an object is equal to its net...
Convolution Properties I01:20

Convolution Properties I

Convolution computations can be simplified by utilizing their inherent properties.
The commutative property reveals that the input and the impulse response of an LTI (Linear Time-Invariant) system can be interchanged without affecting the output:
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: Jun 19, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Impulse-equivalent time-domain optical memory.

X A Shen, R Hartman, R Kachru

    Optics Letters
    |October 31, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We introduce a new method for time-domain optical data storage using specially modulated pulse sequences. This technique ensures high-fidelity data retrieval with low laser power and offers encrypted recording capabilities.

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    Area of Science:

    • Optical physics
    • Data storage technologies
    • Signal processing

    Background:

    • Efficient and secure storage of high-bandwidth serial optical data remains a challenge.
    • Existing methods may require high laser power or suffer from signal degradation.

    Purpose of the Study:

    • To propose a novel time-domain optical data storage approach.
    • To enable high-fidelity and secure storage of serial optical data.
    • To reduce laser power requirements for optical data storage.

    Main Methods:

    • Utilizing two identical impulse-equivalent sequences as write and read pulses.
    • Amplitude and phase modulating these pulse sequences.
    • Designing pulse sequences whose autocorrelations approximate a single brief pulse.

    Main Results:

    • Demonstrated the theoretical existence of suitable impulse-equivalent sequences for all lengths.
    • Achieved faithful data retrieval through precise pulse sequence design.
    • Identified benefits including modest laser power, high signal fidelity, and encrypted recording.

    Conclusions:

    • The proposed approach offers a viable solution for time-domain optical data storage.
    • This method enhances data security and retrieval accuracy.
    • It presents a promising advancement in optical data handling and storage.