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Optical polarization

About: Optical polarization is a research topic. Over the lifetime, 13992 publications have been published within this topic receiving 244284 citations.


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Journal ArticleDOI
TL;DR: This paper relates to the development of a high-voltage sensor system using a PZT piezoelectric crystal as a transducer and a fiber Bragg grating as a sensor for an optical VT for a 13-kV class.
Abstract: Electric power facilities, such as substations, rely on voltage transformers (VTs) for measurement and protection. These pieces of equipment are bulky and heavy and tend to explode, destroying nearby equipment and posing a threat to substation personnel. Optical voltage transducers offer many improvements on traditional inductive and capacitive VTs, such as linear performance, wider dynamic range, lighter weight, smaller size, and improved safety. This paper relates to the development of a high-voltage sensor system using a PZT piezoelectric crystal as a transducer and a fiber Bragg grating as a sensor for an optical VT for a 13.8-kV class. The results show that the developed sensor is capable of attaining the International Electrotechnical Commission 0.2%-accuracy class for the revenue metering system.

77 citations

Journal ArticleDOI
TL;DR: Permanent high efficiency polarization gratings are created in nematic liquid crystal cell by using a command layer of azo-dye molecules directly deposited on the cell substrates and exposed with two interfering laser beams of opposite circular polarizations.
Abstract: We create planar-periodic alignment in nematic liquid crystal (LC) cell by using a command layer of azo-dye molecules directly deposited on the cell substrates and exposed with two interfering laser beams of opposite circular polarizations. Permanent high efficiency polarization gratings are thus created. The diffraction efficiency of those gratings is controlled by a uniform electric field applied across the cell. The electro-optical properties of such polarization gratings are studied. Obtained gratings can be used for electrically controlled discrimination and detection of polarized components of light.

77 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe the optical resonant manipulation of a single magnetic impurity in a self-assembled quantum dot and show that using the resonant pumping one can address and manipulate selectively individual spin states of a magnetic impurate.
Abstract: We describe the optical resonant manipulation of a single magnetic impurity in a self-assembled quantum dot. We show that using the resonant pumping one can address and manipulate selectively individual spin states of a magnetic impurity. The mechanisms of resonant optical polarization of a single impurity in a quantum dot involve anisotropic exchange interactions and are different than those in diluted semiconductors. A Mn impurity can be prepared in a given spin state and can act as qubit. The limiting factors for the spin manipulation are the electron-hole exchange interaction and finite temperature.

77 citations

Journal ArticleDOI
P.F. Wysocki1, V. Mazurczyk2
TL;DR: In this article, a computer model for polarization dependent gain in Er-doped fiber amplifiers (EDFA) is presented, which assumes that each erbium ion possesses an ellipsoidal gain surface and that all ion orientations are equally likely.
Abstract: A computer model for polarization dependent gain (PDG) in Er-doped fiber amplifiers (EDFA) is presented. The model assumes that each erbium ion possesses an ellipsoidal gain surface and that all ion orientations are equally likely. By dividing the ions into subsets based upon orientation and computing the inversion of each subset in the presence of polarized pump and signal waves, the model predicts the dependence of the PDG induced by this polarization hole-burning (PHB) on the design of the EDFA, the signal degree and state of polarization (SOP), and the pump SOP. For moderate gain amplifiers (made from the same fiber) with the same gain peak wavelength and the same compression level, the magnitude of the PDG is nearly independent of the EDFA gain. Internal and random fiber birefringence are included to model real fibers. In fibers which cause the signal SOP to walk rapidly around the Poincare sphere, the PDG is reduced by a factor of 2/3 when compared with a linear polarization-maintained signal. Scrambled signals and partially-polarized saturating tones are also considered. Simple rules are derived for predicting the PDG of a given EDFA.

77 citations

Proceedings ArticleDOI
21 Jul 2008
TL;DR: The physics behind the constant-modulus algorithm is elucidated, and a modified method of assuring proper polarization demultiplexing is proposed.
Abstract: The constant-modulus algorithm has been widely applied to demultiplexing of dual polarizations with a digital coherent receiver. This paper elucidates the physics behind this algorithm, and proposes a modified method of assuring proper polarization demultiplexing.

77 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
2021404
2020359
2019318
2018470
2017504