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Related Concept Videos

Group Polarization01:01

Group Polarization

Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Coherent optical communication using polarization multiple-input-multiple-output.

Yan Han, Guifang Li

    Optics Express
    |June 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Digital signal processing enables coherent detection of polarization-division multiplexed (PDM) signals, analogous to wireless MIMO. This approach bypasses the need for optical dynamic polarization control in optical polarization MIMO systems.

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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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    Area of Science:

    • Optical Communications
    • Digital Signal Processing
    • Wireless Communications Analogy

    Background:

    • Polarization-division multiplexed (PDM) optical signals require advanced demultiplexing techniques.
    • Traditional methods often rely on complex optical dynamic polarization control.
    • Digital signal processing offers a potential alternative for signal recovery.

    Purpose of the Study:

    • To demonstrate coherent detection of PDM signals using digital signal processing.
    • To establish an analogy between optical polarization MIMO and wireless MIMO systems.
    • To explore the applicability of wireless channel estimation algorithms in optical systems.

    Main Methods:

    • Applying wireless MIMO channel estimation algorithms to optical polarization MIMO (PMIMO).
    • Integrating frequency offset and phase estimation algorithms.
    • Conducting simulations using commercial semiconductor lasers and PDM quadrature phase-shift keying signals.

    Main Results:

    • Successful coherent detection of PDM signals was achieved through simulations.
    • The proposed scheme eliminated the need for optical phase locking and polarization control.
    • The analogy highlights potential for space-time coding in optical systems.

    Conclusions:

    • Digital signal processing provides an effective method for demultiplexing PDM optical signals.
    • The analogy to wireless MIMO facilitates the transfer of advanced signal processing techniques.
    • This research opens avenues for simplified and robust optical communication receivers.