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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Upsampling01:22

Upsampling

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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

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In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
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Sampling Methods: Overview01:06

Sampling Methods: Overview

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A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Sampling Plans01:23

Sampling Plans

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
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Related Experiment Video

Updated: May 3, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Tunable WDM sampling pulse streams using a spatial phase modulator in a biased pulse shaper.

David Sinefeld, Dror Shayovitz, Ori Golani

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    |February 4, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Researchers created transform-limited WDM optical sampling pulse bursts using a mode-locked laser and a spatial light modulator (SLM). This method precisely controls pulse bandwidth and rates for advanced optical sampling applications.

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    Area of Science:

    • Optics and Photonics
    • Ultrafast Lasers
    • Optical Communications

    Background:

    • Mode-locked lasers are crucial for generating ultrashort optical pulses.
    • Optical sampling requires precise control over pulse characteristics like bandwidth and timing.
    • Phase wraps in pulse shaping can limit the achievable phase response.

    Purpose of the Study:

    • To generate transform-limited Wavelength Division Multiplexing (WDM) optical sampling pulse bursts.
    • To develop a pulse shaping technique that avoids 2π phase wraps for improved phase response.
    • To achieve precise control over pulse bandwidth, stream rates, and duty cycle for optical sampling.

    Main Methods:

    • Utilizing ultrashort pulses from a mode-locked laser.
    • Employing a biased pulse shaper incorporating a phase spatial light modulator (SLM).
    • Filtering and manipulating pulse bandwidths to achieve desired characteristics.

    Main Results:

    • Successfully generated transform-limited WDM optical sampling pulse bursts.
    • Circumvented the limitations of 2π phase wraps using the SLM-based pulse shaper.
    • Demonstrated precise control over user-selectable pulse bandwidths, pulse stream rates, and duty cycle.

    Conclusions:

    • The developed method enables flexible and precise generation of optical sampling pulse bursts.
    • The SLM-based pulse shaping offers enhanced control over optical pulse characteristics.
    • This technique advances capabilities in WDM optical sampling and related fields.