Single-polarisation operation of highly birefringent bow-tie optical fibres

Varnham, M.P.; Payne, D.N.; Birch, R.D.; Tarbox, E.J.

doi:10.1049/el:19830169

Cited by 127 publications

(29 citation statements)

References 4 publications

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“…studied (Klein and Heinlein 1982;Varnham et al 1983). Recently, highly birefringent fibers are one of the most successful applications of microstructured optical fibers (MOFs) (Ortigosa-Blanch et al 2000).…”

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confidence: 99%

Numerical analysis of a highly birefringent microstructured optical fiber with an anisotropic core

et al. 2014

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In this paper, modeling and optimization of a highly birefringent microstructured optical fiber with an anisotropic structure of a lamellar core is analyzed. The core consists of a linear stack of a high refractive index lead oxide glass F2 and a low refractive index borosilicate glass NC21A, which contributes to the anisotropy of two orthogonal polarizations of the fundamental mode propagating in the fiber. It is shown, that an appropriate choice of thickness and width of the layers constituting the core structure, enables reducing the dispersion of birefringence of the considered modes, in a wide spectral range. It is further investigated how a sub-wavelength defect, in form of a low refractive index glass introduced in the middle of the core, influences fiber's birefringence. We show for the first time, that nanodefect introduced into a lamellar core structure further reduces dispersion of birefringence in the fiber over one octave range. An average birefringence of 1.95 × 10 −3 with variation below 5 % is achieved in 800-2,000 nm bandwidth.

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Numerical analysis of a highly birefringent microstructured optical fiber with an anisotropic core

et al. 2014

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“…16. These are bending type bow-tie fibers with lowaperture core, allowing the birefringence to play a significant role at the background of its small Δn.…”

Section: Long Fibers (<500 M)mentioning

confidence: 99%

“…"Upper" fiber (and PZ-fiber from Ref. 16) advantages are: (1) wide dichroism window due to effective birefringence utilization at the background of low Δn ¼ Δn þ ; (2) single mode regime. Disadvantages are: (1) problem to yield MFD 6 to 8 μm; (2) loss and fundamental mode field deformation due to penetration into SAP.…”

Section: Long Fibers (<500 M)mentioning

confidence: 99%

Polarization and modal filters based on W-fibers Panda for fiber-optic gyroscopes and high-power fiber lasers

Kurbatov

2013

Opt. Eng

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Abstract. Polarizing Panda-type W-fibers, practical realizations are presented for fiber-optic gyroscope (FOG) sensing coil (500-m length, 8-μm fundamental mode field diameter) and for polarization/modal filtering at the FOG loop interferometer input (∼1-m length, 10-μm fundamental mode field diameter). Using these fibers, two different mathematical models for light propagation are tested and applied for further dichroism spectral band spreading of polarizing W-fibers with fundamental mode field diameter (MFD) of 6 to 10 μm for FOG coil and at least with MFD ¼ 8 to 10 μm for input filtering in loop interferometer. Also, some fibers with large MFD are considered, which may be useful for high-power fiber lasers, requiring the low nonlinear effects. One is a practically realized single-mode 200-m W-fiber Panda with dichroism and MFD ¼ 12.4 μm at 1.06 μm, which is bend resistant for 60-mm diameters. For further MFD increase a straight 100-mm length modal and polarization filters are suggested with MFD ¼ 30 to 70 μm at 1.06 μm, based on a pure silica core fiber, narrow/shallow fluorine cladding, and stress-applying parts. The latter are used for core refractive index regulation by birefringence (W-profile forming), which is more precise than with core germanium doping. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Hi-Bi fibers can be produced by introducing stress applying parts around the fiber core, examples of this type of Hi-Bi fibers are the commercial PANDA [4] and Bow-Tie fibers [5]. Alternatively, Hi-Bi operation can be achieved by asymmetric waveguide geometry with elliptical core fibers as a typical representative of this type [6,7].…”

Section: Introductionmentioning

confidence: 99%

Highly birefringent optical microfibers

Xuan¹,

Ju²,

Jin³

2010

Opt. Express

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Abstract:Highly birefringent (Hi-Bi) air-clad silica microfibers (MFs) with wavelength and sub-wavelength scale transverse dimensions are studied theoretically and experimentally. Hi-Bi MFs are taper-drawn from the standard SMF-28 single mode fibers that are "pre-processed" by "cutting away" parts of the silica cladding on opposite sides of the fiber with a femtosecond infrared laser. Such Hi-Bi MFs have approximately elliptical cross-sections and are approximated by a three-layer model comprising a small central Ge-doped region surrounded by an elliptical silica region and an air-cladding. Theoretical modeling shows that phase and group birefringence of the order 10 −2 can be achieved with such air-clad Hi-Bi MFs. Experiments with an air-clad elliptical fiber with a major diameter of 0.9µm and a minor/major diameter ratio of 0.9 demonstrated a group birefringence of ~ 0.015, agreeing well with the theoretical predictions. The Hi-Bi MFs are useful for micron/nanoscale polarization maintaining transmission and phase-sensitive interferometric sensors. Express 12(9), 1916-1923 (2004). 24. R. B. Dyott, Elliptical fiber waveguides (Artech House, boston.london, 1995). 25. C. Yeh, "Elliptical dielectric waveguides," J. Appl. Phys. 33(11), 3235-3243 (1962 2359-2371 (1995). 27. S. C. Rashleigh, "Measurement of fiber birefringence by wavelength scanning: effect of dispersion," Opt. Lett. ©2010 Optical Society of America

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Single-polarisation operation of highly birefringent bow-tie optical fibres

Cited by 127 publications

References 4 publications

Numerical analysis of a highly birefringent microstructured optical fiber with an anisotropic core

Numerical analysis of a highly birefringent microstructured optical fiber with an anisotropic core

Polarization and modal filters based on W-fibers Panda for fiber-optic gyroscopes and high-power fiber lasers

Highly birefringent optical microfibers

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