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Related Concept Videos

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.
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Parallel Resonance01:23

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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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.
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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...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Low-noise parametric frequency comb for continuous C-plus-L-band 16-QAM channels generation.

Eduardo Temprana, Vahid Ataie, Bill P-P Kuo

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    This study demonstrates a low phase noise frequency comb for C- and L-band optical communications. The comb successfully generated high-quality 16-ary quadrature amplitude modulated signals with minimal performance variation.

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    Area of Science:

    • Optical Engineering
    • Telecommunications
    • Laser Physics

    Background:

    • Frequency combs are crucial for high-capacity optical networks.
    • Generating low phase noise combs across broad bandwidths remains a challenge.
    • Continuous wave-seeded parametric generation offers a potential solution.

    Purpose of the Study:

    • To experimentally demonstrate a low phase noise frequency comb across C- and L-bands.
    • To utilize parametrically generated carriers for advanced modulation formats.
    • To assess the performance of modulated signals across the combined spectral range.

    Main Methods:

    • Generation of a frequency comb from a continuous-wave seed laser.
    • Parametric amplification to produce comb carriers with high optical signal-to-noise ratio (OSNR).
    • Generation and characterization of 16-ary quadrature amplitude modulated (16-QAM) signals.

    Main Results:

    • Successful demonstration of a low phase noise frequency comb spanning continuous C- and L-bands.
    • Parametric carriers achieved OSNR exceeding 45 dB.
    • 20 GBaud 16-QAM channels exhibited a power variation of only 1.7 dB across the C/L band.

    Conclusions:

    • The demonstrated frequency comb is suitable for high-performance optical communication systems.
    • Parametric carrier generation provides a robust method for generating high-OSNR signals.
    • The results indicate the feasibility of broadband, high-capacity optical transmission using this technology.