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Group Polarization

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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Updated: Jun 20, 2026

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

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

Published on: February 28, 2016

Polarization-mode interferometry in birefringent single-mode fibers.

L Thévenaz¹, V de Coulon, J P Von der Weid

¹University of Geneva, Group of Applied Physics, 20 rue Ecole-de-Medecine, 1211 Geneva 4, Switzerland.

|September 11, 2009

Summary

This study introduces an interferometric technique to measure polarization-mode dispersion in optical fibers. The method accurately determines relative group delays without requiring polarizing components.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Birefringent single-mode fibers exhibit polarization-dependent properties.
Understanding polarization-mode dispersion (PMD) is crucial for optical communication systems.

Purpose of the Study:

To develop and validate an interferometric technique for measuring relative phase delay.
To directly deduce polarization-mode dispersion from phase delay measurements.
To assess the technique's sensitivity and applicability to meter-length fiber samples.

Main Methods:

Utilized an interferometric approach to probe polarization modes within birefringent single-mode fibers.
Measured relative phase delay across a spectrum of wavelengths.
Analyzed phase delay data to calculate polarization-mode dispersion.

Main Results:

Successfully measured the relative phase delay between polarization modes.
Quantified polarization-mode dispersion directly from phase delay data.
Achieved a measurement sensitivity of 20 femtoseconds for relative group delays in meter-length fibers.

Conclusions:

The developed interferometric technique offers a precise method for characterizing PMD.
The technique eliminates the need for external light-polarizing devices.
This advancement facilitates accurate PMD assessment in birefringent single-mode fibers.