Journal ArticleDOI
Birefringence caused by thermal stress in elliptically deformed core optical fibers
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In this article, birefringence and polarization dispersion introduced by thermal stress in single-mode fibers with elliptical core are formulated in terms of fiber structure parameters, thermal expansion coefficients, and thermoelastic constants.Abstract:
Birefringence and polarization dispersion introduced by thermal stress in single-mode fibers with elliptical core are formulated here in terms of fiber structure parameters, thermal expansion coefficients, and thermoelastic constants. Thermal stress distribution and birefringence characteristics are estimated within first-order perturbation with respect to fiber core ellipticity. Normalized frequency dependence of birefringence and polarization dispersion is also derived in this paper. Birefringence and polarization dispersion in elliptical core fiber are seen to depend on thermal stress rather than geometrical anisotropy for relatively small relative index differences. Numerical examples are presented for germanosilicate, borosilicate, and phosphosilicate glass fibers.read more
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Journal ArticleDOI
Polarization-maintaining fibers and their applications
Juichi Noda,K. Okamoto,Y. Sasaki +2 more
TL;DR: In this article, the classification of high-birefringent and low-birrringent fibers and their fabrication methods and characteristics are discussed in Section II and Section III, respectively.
Journal ArticleDOI
Origins and control of polarization effects in single-mode fibers
TL;DR: In this article, the basic birefringences that couple the two modes and change the polarization state along the fiber are reviewed, and three cases of uniform, phase-matched, and random coupling are considered.
Journal ArticleDOI
Coherent optical fiber transmission systems
Yoshihisa Yamamoto,T. Kimura +1 more
TL;DR: In this paper, the feasibility of coherent optical fiber transmission systems was studied from the view point of device and system consideration and expected performance, in which laser coherence is utilized to carry information.
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Smart Structures and Materials
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References
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Journal ArticleDOI
Low-loss single polarisation fibres with asymmetrical strain birefringence
TL;DR: In this paper, low-loss and highly birefringent single polarisation fibres have been fabricated and the minimum transmission loss and the modal bire fringence of the fibre with refractive index difference was 0.61% and 0.62 dB/km at?=1.52?m and 8.5×10?5 at? =1.15?m, respectively.
Journal ArticleDOI
Birefringence and polarization characteristics of single-mode optical fibers under elastic deformations
TL;DR: In this paper, the effects of twist in an elliptical core fiber gave rise to a polarization whose major axis points in an intrinsic direction with an azimuthal angle, where φ t is the torsion per unit length and z is the fiber length.
Journal ArticleDOI
Stress analysis of optical fibers by a finite element method
K. Okamoto,T. Hosaka,T. Edahiro +2 more
TL;DR: In this article, a finite element method was used to calculate modal birefringence due to thermal stress and/or stress caused by external forces in noncircular core fibers.
Journal ArticleDOI
Low-loss single-polarisation fibres
TL;DR: In this paper, a low-loss single-mode fibres that maintain polarisation well have been fabricated by the standard MCVD method, achieving an extinction ratio of less than −30 dB at 1 km and a loss of 0.8 dB/km at 1.5 μm.
Journal ArticleDOI
Birefringence in elliptically clad borosilicate single-mode fibers.
TL;DR: It is shown that, for a given dopant concentration, the birefringence depends primarily on the cladding ellipticity e and increases linearly with increasing ellipticity and expansion coefficient mismatch.