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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Polarization mode dispersion measurement based on continuous polarization modulation.

Bogdan Szafraniec1, Rüdiger Mästle, Douglas M Baney

  • 1Agilent Laboratories, 5301 Stevens Creek Boulevard, MS 54U-SC, Santa Clara, California 95051, USA. Bogdan_Szafraniec@Agilent.com

Applied Optics
|March 11, 2008
PubMed
Summary

A new optical measurement technique uses continuous polarization modulation to accurately determine group delay (GD) and differential group delay (DGD). This method offers improved accuracy and insensitivity to environmental drift for optical fibers and components.

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Area of Science:

  • Optoelectronics and Photonics
  • Optical Metrology

Background:

  • Accurate measurement of group delay (GD) and differential group delay (DGD) is crucial for optical systems.
  • Traditional phase shift methods for GD/DGD measurement involve sequential polarization state switching.
  • These methods can be complex and sensitive to environmental factors.

Purpose of the Study:

  • To propose and validate a novel technique for measuring GD and DGD in optical materials, components, and fibers.
  • To develop a method that overcomes limitations of traditional techniques.
  • To enhance the accuracy and robustness of optical delay measurements.

Main Methods:

  • A new technique based on continuous polarization modulation of the optical field.
  • Utilizes modified Jones calculus for a complete derivation of the phase shift method.
  • Introduces an expression for phase shift incorporating polarization-dependent loss (PDL) and DGD.

Main Results:

  • The proposed method accurately measures GD and DGD.
  • Evaluated using polarization-maintaining fiber and 50 km of single-mode fiber (1530-1610 nm).
  • DGD measurements in long single-mode fibers show high insensitivity to environmentally induced GD drift.

Conclusions:

  • The novel continuous polarization modulation technique provides accurate GD and DGD measurements.
  • The method effectively combines the effects of PDL and DGD in its measurement.
  • Demonstrated robustness against environmental disturbances for long-haul fiber characterization.