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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

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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...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Related Experiment Video

Updated: Nov 11, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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2D-to-1D constellation reforming using phase-sensitive amplifier-based constellation squeezing and shifting.

Jiabin Cui, Yuefeng Ji, Guo-Wei Lu

    Optics Express
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    Summary

    This study introduces a novel phase-sensitive amplifier (PSA)-based system for converting 2D QAM signals to 1D PAM signals. The system enables efficient optical signal format conversion for diverse network applications.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Photonics

    Background:

    • Advanced modulation formats like Quadrature Amplitude Modulation (QAM) are crucial for high-capacity optical networks.
    • Converting between modulation formats, such as 2D QAM to 1D Pulse Amplitude Modulation (PAM), is essential for network flexibility and interoperability.

    Purpose of the Study:

    • To propose and analyze a novel phase-sensitive amplifier (PSA)-based system for 2D-to-1D constellation reforming.
    • To demonstrate the system's capability for various QAM-to-PAM conversions, including high-order formats like 8QAM-to-PAM8.

    Main Methods:

    • The proposed system utilizes a constellation squeezing PSA and a multi-level vector moving PSA.
    • Detailed theoretical analysis of PSA transfer characteristics and gain axis angle solutions.
    • Experimental validation measuring signal constellations, spectra, eye diagrams, EVM, and BER.

    Main Results:

    • The system theoretically supports seven types of 10 GBaud QAM-to-PAM conversions.
    • Successful 8QAM-to-PAM8 conversion demonstrated, achieving specific receiver OSNR values at a target BER.
    • Measured performance metrics validate the effectiveness of the constellation reforming process.

    Conclusions:

    • The developed 2D-to-1D constellation reforming system effectively bridges long-haul and short-reach optical networks.
    • The system is suitable for optical signal format conversion, high-order signal generation, and flexible data aggregation/de-aggregation.