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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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Ultra-compact and highly efficient polarization rotator utilizing multi-mode waveguides.

Hongnan Xu, Yaocheng Shi

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    |February 16, 2017
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    Summary
    This summary is machine-generated.

    We developed a compact silicon-on-insulator polarization rotator. This device efficiently rotates transverse magnetic (TM) to transverse electric (TE) polarization using multi-mode waveguides, requiring only one fabrication step.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Polarization control is crucial for optical communication systems.
    • Existing polarization rotators often suffer from large footprints or complex fabrication.
    • Silicon-on-insulator (SOI) offers a robust platform for integrated photonic devices.

    Purpose of the Study:

    • To propose and experimentally demonstrate an ultra-compact and highly efficient polarization rotator.
    • To achieve transverse magnetic (TM) to transverse electric (TE) polarization conversion.
    • To simplify the fabrication process for integrated photonic devices.

    Main Methods:

    • Utilizing a straight multi-mode waveguide for the TM0-TE1 polarization rotation.
    • Employing a bent multi-mode waveguide for the TE1-TE0 mode conversion.
    • Fabricating the device on a silicon-on-insulator (SOI) platform with a single etching step.

    Main Results:

    • Experimental realization of an ultra-compact polarization rotator.
    • Achieved a measured extinction ratio of 19.8 dB.
    • Obtained a low insertion loss of 0.86 dB at the central wavelength.
    • Demonstrated good agreement between experimental results and simulations.

    Conclusions:

    • The proposed device offers a highly efficient and compact solution for polarization rotation.
    • The simplified single-etching fabrication process is advantageous for mass production.
    • This technology holds promise for advanced integrated photonic applications.