Spun optical fibres: A helical structure of linear birefringence or circular birefringence?

Morshnev, S. K.; Gubin, V. P.; Vorob'ev, Igor' L; Starostin, I I; Sazonov, A. I.; Chamorovsky, Yury K; Korotkov, N. M.

doi:10.1070/qe2009v039n03abeh013945

Cited by 14 publications

(4 citation statements)

References 5 publications

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“…The units of the nonlinear coefficient are [W×m] -1 . The pair of equations may be readily extended to include the Kerr effect, and linear losses with a coefficient  [40][41][42]:…”

Section: Nonlinear Polarization Terms Nonlinear Wave Equations and Ap...mentioning

confidence: 99%

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Invited Article: Distributed analysis of nonlinear wave mixing in fiber due to forward Brillouin scattering and Kerr effects

et al. 2018

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Forward stimulated Brillouin scattering (F-SBS) is a third-order nonlinear-optical mechanism that couples between two co-propagating optical fields and a guided acoustic mode in a common medium. F-SBS gives rise to nonlinear wave mixing along optical fibers, which adds up with fourwave mixing induced by the Kerr effect. In this work, we report the distributed mapping of nonlinear wave mixing processes involving both mechanisms along standard single-mode fiber, in analysis, simulation and experiment. Measurements are based on a multi-tone, optical time-domain reflectometry setup, which is highly frequency-selective. The results show that F-SBS leads to nonlinear wave mixing processes that are more complex than those that are driven by the Kerr effect alone. The dynamics are strongly dependent on the exact frequency detuning between optical field components. When the detuning is chosen near an F-SBS resonance, the process becomes asymmetric. Power is coupled from an upper-frequency input pump wave to a lowerfrequency one, and the amplification of Stokes-wave sidebands is more pronounced than that of anti-Stokes-wave sidebands. The results are applicable to a new class of distributed fiber-optic

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“…The units of the nonlinear coefficient are [W×m] -1 . The pair of equations may be readily extended to include the Kerr effect, and linear losses with a coefficient  [40][41][42]:…”

Section: Nonlinear Polarization Terms Nonlinear Wave Equations and Ap...mentioning

confidence: 99%

“…It is assumed herein that the length scale of nonlinear wave mixing processes is much longer than the beat length of residual linear birefringence in standard fiber [40][41][42]. The chromatic dispersion of standard fibers is not considered.…”

Section: Nonlinear Polarization Terms Nonlinear Wave Equations and Ap...mentioning

confidence: 99%

Invited Article: Distributed analysis of nonlinear wave mixing in fiber due to forward Brillouin scattering and Kerr effects

et al. 2018

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“…A spun fiber is formed by spinning the standard single-mode fiber preform during the fiber drawing process-precursor birefringence axes are rotated at a rate proportional to the spin rate [38,39]; see Figure 2b. Therefore, the precursor birefringence ∆β and spin rate ξ are the two important parameters that control the performance of the spun sensing fiber [40][41][42]. Before analyzing the experimental data, it is instructive to theoretically model the measurement principle and deduce an analytical equation, which helps in interpreting the experimental traces.…”

Section: Polarization-sensitive Reflectometry For Distributed Magneti...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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“…random birefringence with beat lengths and coupling lengths between 15-50 m[16].   z T also included a deterministic birefringence term with fixed axes due to the coiling of the fiber around a drum of 15 cm diameter[17]. The third term represents Kerr nonlinearity, with a coefficient…”

mentioning

confidence: 99%

Theoretical and Experimental Mapping of Forward Brillouin Scattering Four-Wave Mixing Processes in Fiber

London

Diamandi

Bashan

et al. 2018

26th International Conference on Optical Fiber Sensors

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Spun optical fibres: A helical structure of linear birefringence or circular birefringence?

Cited by 14 publications

References 5 publications

Invited Article: Distributed analysis of nonlinear wave mixing in fiber due to forward Brillouin scattering and Kerr effects

Invited Article: Distributed analysis of nonlinear wave mixing in fiber due to forward Brillouin scattering and Kerr effects

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

Theoretical and Experimental Mapping of Forward Brillouin Scattering Four-Wave Mixing Processes in Fiber

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