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Related Concept Videos

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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Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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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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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Optical SSB modulator/frequency shifter with ultralow spurious sidebands.

Najmeh Safavi, S Esmail Hosseini

    Applied Optics
    |September 9, 2020
    PubMed
    Summary

    This paper introduces a novel optical modulator using Sagnac interferometers for ultralow spurious sidebands. The design offers robust performance and tunable carrier-to-sideband ratios for advanced optical signal processing.

    Area of Science:

    • Photonics
    • Optical Communications
    • Signal Processing

    Background:

    • Optical modulators are crucial for signal processing.
    • Existing designs often suffer from spurious sidebands and DC bias drift.
    • Achieving suppressed-carrier signals with high purity is essential for advanced applications.

    Purpose of the Study:

    • To theoretically investigate and report a novel optical single-sideband suppressed-carrier (OSSB-SC) modulator/frequency shifter.
    • To achieve ultralow spurious sidebands and robust performance.
    • To enable tunable optical carrier-to-sideband ratios (OCSR).

    Main Methods:

    • The proposed structure utilizes three Sagnac interferometers (SIs) and two bidirectional phase modulators (PMs).
    • Four radio frequency (RF) signals with equal powers and controlled phases drive the PMs.

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  • Analytical investigation and simulations using commercial software were employed.

    • Main Results:

    • An OSSB-SC signal with only (4n+1)th-order sidebands is generated.
    • An OSSB with carrier (OSSB+C) modulator with tunable OCSR is achievable.
    • The structure demonstrates robustness against environmental perturbations and DC bias-drift due to the SI-based design.

    Conclusions:

    • The proposed SI-based modulator offers superior performance with ultralow spurious sidebands.
    • The design provides flexibility for tunable OCSR, enhancing its applicability.
    • The robustness and lack of DC bias requirement make it suitable for practical optical systems.