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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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Related Experiment Video

Updated: Jun 20, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Birefringent-fiber polarization coupler.

R C Youngquist, J L Brooks, H J Shaw

    Optics Letters
    |September 1, 2009
    PubMed
    Summary

    Researchers developed a novel birefringent fiber polarization coupler. This device enables efficient power transfer between polarization modes and functions as a wavelength-selective filter.

    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Waveguide Devices

    Background:

    • Birefringent fibers support multiple polarization modes.
    • Coherent coupling between these modes can be induced by periodic stress.
    • Existing methods for mode coupling may lack efficiency or tunability.

    Purpose of the Study:

    • To describe and demonstrate a novel birefringent-fiber polarization coupler.
    • To achieve efficient power transfer between polarization modes.
    • To explore the device's application as a wavelength-selective optical filter.

    Main Methods:

    • Fabrication of a birefringent fiber coupler with periodic stress applied.
    • Characterization of polarization mode coupling efficiency.
    • Integration into a Mach-Zehnder interferometer to measure extinction ratio.

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    Implementation of a Reference Interferometer for Nanodetection
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    Last Updated: Jun 20, 2026

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    14:18

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    Published on: February 28, 2016

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    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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  • Evaluation of wavelength selectivity for multiplexing and filtering applications.

    • Main Results:

    • Achieved over 30 dB of power transfer between polarization modes.
    • Demonstrated better than 25 dB on/off extinction ratio when used in a Mach-Zehnder interferometer.
    • Confirmed wavelength selectivity, enabling use as a multiplexer or notch filter.
    • Obtained a 9-nm full width at half-maximum notch with a 60-period comb structure.

    Conclusions:

    • The developed birefringent-fiber polarization coupler offers high performance for mode coupling.
    • The device's wavelength selectivity makes it suitable for optical filtering and multiplexing.
    • This technology presents a versatile component for integrated optical systems.