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Double Resonance Techniques: Overview01:12

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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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Optical pulse division multiplexing-based OBI reduction for single wavelength uplink multiple access in IM/DD

Sun-Young Jung, Chang-Hun Kim, Sang-Min Jung

    Optics Express
    |December 14, 2016
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    Summary

    Orthogonal frequency division multiple access-based passive optical networks (OFDMA-PONs) face uplink interference. A new optical pulse division multiplexing method effectively reduces optical beat interference, enhancing spectral efficiency for next-generation networks.

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    Area of Science:

    • Optical communication systems
    • Signal processing for optical networks

    Background:

    • Orthogonal frequency division multiple access-based passive optical network (OFDMA-PON) is a leading technology for future optical access networks.
    • Uplink transmission in intensity modulation/direct detection OFDMA-PON systems suffers from optical beat interference (OBI) and timing offsets due to varying optical paths, hindering signal detection.

    Purpose of the Study:

    • To propose and demonstrate a novel method for reducing optical beat interference (OBI) in OFDMA-PON uplink transmissions.
    • To improve the spectral efficiency of OFDMA-PON systems by mitigating uplink signal disturbances.

    Main Methods:

    • The study introduces an optical pulse division multiplexing technique for OBI reduction.
    • The method leverages spectrum broadening effects and time-domain near-orthogonality to suppress interference.

    Main Results:

    • Optical beat interference (OBI) was significantly reduced using the proposed optical pulse division multiplexing method.
    • Spectral efficiency in a 1-GHz signal bandwidth was improved from 0.37 to 3.8 bit/s/Hz.

    Conclusions:

    • The proposed optical pulse division multiplexing approach effectively addresses critical uplink OBI issues in OFDMA-PON systems.
    • This technique offers a viable solution for enhancing the performance and spectral efficiency of next-generation optical access networks.