Faraday rotation in a single-mode fiber with controlled birefringence

Grexa, Michael; Hermann, G.; Lasnitschka, G.; Scharmann, A.

doi:10.1007/bf00697704

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…In the earlier work, for the optical fiber current sensor with the current of 120 A, 26 loops of 15 cm diameter, and 636 nm of operating wavelength had shown the Faraday rotation of about 14 mrad, which gives (from Eq. (3)) the current sensitivity of 4.48 µrad/A for one loop [13], while in another report, the current sensitivity of about 5.58 µrad/A has been reported for the optical fiber current sensor [15]. The germanium concentration, the fiber structure, experimental conditions causing a small portion of linear polarization to be remained with the circular polarization can degrade the current sensitivity and these can be the cause of difference between current sensitivities of current sensors made with our single mode optical fiber and that of reported fibers.…”

Section: Resultsmentioning

confidence: 86%

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Enhanced current sensitivity in the optical fiber doped with CdSe quantum dots

Watekar¹,

Yang²,

Ju³

et al. 2009

Opt. Express

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Section: Resultsmentioning

confidence: 86%

“…Twisting of optical fibers has been already used to enhance the current sensitivity of optical fibers [13][14][15]. In fact, it has been observed that in the spun fibers, sensitivity reaches the value for the ideal isotropic fiber [14].…”

Section: Current Sensitivitymentioning

confidence: 99%

Enhanced current sensitivity in the optical fiber doped with CdSe quantum dots

Watekar¹,

Yang²,

Ju³

et al. 2009

Opt. Express

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“…Note that the schematic of this alternative measurement setup is similar to the first method (see Figure 1), except for an extra PC and a 22.5 • Faraday rotator (FR) placed after the LP. The role of the PC after the LP is to compensate for the effects in the lead fiber and help launch a desired SOP into the sensing fiber [63]. The 22.5 • FR is used to rotate the SOP by 22.5 • in both forward and backward propagation of the light, respectively, so that an extra 45 • SOP rotation, compared to that of the First setup, is induced in the backscattered light reaching the detector.…”

Section: Approach For Avoiding the Issue Due To Reflectometer's Noise...mentioning

confidence: 99%

Distributed Poloidal Magnetic Field Measurement in Tokamaks Using Polarization-Sensitive Reflectometric Fiber Optic Sensor

Dandu

Gusarov

Leysen

et al. 2023

Sensors

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Determination of the poloidal magnetic field distribution in tokamaks is of prime importance for the successful operation of tokamaks. In this paper, we propose a polarization-sensitive reflectometry-based optical fiber sensor for measuring the spatial distribution of the poloidal magnetic field in tokamaks. The measurement method exploits the Rayleigh backscattering and Faraday magneto-optic effect in optical fibers. The former is an intrinsic property of optical fibers and enables distributed polarization measurements, while the latter arises in the presence of a magnetic field parallel to the optical fiber axis and rotates the polarization state of the light. When an optical fiber is looped around a toroidal section of the vacuum vessel, the local polarization rotation of the light is proportional to the local poloidal magnetic field in the tokamak. The proposed method is discussed theoretically and experimentally using the results from JET. The obtained magnetic field measurement shows a good agreement with that of the internal discrete coils. A potential solution to recover the magnetic field data from the noise-affected region of the optical measurement is proposed and is demonstrated through simulations using the JET magnetic field configuration.

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Polarization Optics, Polarimeters and Polarization Spectrometers

Hermann

2004

Digital Encyclopedia of Applied Physics

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Polarimeters, employing polarization optics, are well known as highly precise and accurate instruments for determining optically active substances. Even simple manual polarimeters offer high accuracies compared to other analytical methods. Also, more sophisticated devices with half‐shadow adjustment and with quartz‐wedge compensation were already constructed in early times of polarimetry. High improvement of polarimeters has been obtained with modern automated and semiautomated instruments. Until now, polarimetry has been the main analytical standard method for determining sucrose in the sugar and beverage industries and is an important tool for controlling production processes of optically active substances. For obtaining high precision and accuracy, the brightness and monochromaticity of the light source is important. While polarimetry is based on intrinsic optical activity, polarization spectroscopy also measures anisotropies that may be induced into isotropic atomic or molecular species by DC electric or magnetic fields or also by interaction with radiation. Doppler‐free methods of nonlinear polarization spectroscopy yield high spectral resolution and result in the suppression of interferences by extremely close‐lying lines. Polarization spectroscopy based on an applied DC magnetic field, which is also denoted as coherent forward scattering spectroscopy (CFS), allows simultaneous multielement determination in combination with continuum light sources and the measurement over an extremely wide dynamic range.

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Faraday rotation in a single-mode fiber with controlled birefringence

Cited by 6 publications

References 16 publications

Enhanced current sensitivity in the optical fiber doped with CdSe quantum dots

Enhanced current sensitivity in the optical fiber doped with CdSe quantum dots

Distributed Poloidal Magnetic Field Measurement in Tokamaks Using Polarization-Sensitive Reflectometric Fiber Optic Sensor

Polarization Optics, Polarimeters and Polarization Spectrometers

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