Results 231 to 240 of about 14,697,656 (278)

Photonic bandgap fibers with high birefringence

IEEE Photonics Technology Letters, 2002
A highly birefringent air-guiding photonic crystal fiber which provides guidance by a full two-dimensional photonic bandgap (PBG) effect is proposed. The fiber core is formed by introducing a large air hole that has an area of four unit cells of the cladding materials.
Kunimasa Saitoh, Masanori Koshiba
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Precise method for modifying birefringence of stress-induced high-birefringence fiber

Optics Letters, 2010
A precise method for modifying the birefringence of stress-induced high-birefringence (Hi-Bi) fiber is demonstrated by side polishing a Panda-type fiber with a maximum polished length of at least 14 cm. The polishing depth is controlled with an accuracy of 0.1 microm by piezoelectric ceramic microdisplacement.
Ruifeng, Zhao, Li, Pei, Xiaowei, Dong, Tigang, Ning, Zhuoxuan, Li, Weiwei, Jiang, Linyong, Fan, Chenfang, Zhang   +7 more
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The dynamic birefringence of high polymers

Journal of Polymer Science Part B: Polymer Physics, 1962
AbstractThe simultaneous measurement of the birefringence and strain of a sample subjected to sinusoidal strain is proposed as a means for elucidating the molecular mechanism of the response of high polymers to mechanical deformation. A linear phenomenological theory is proposed in which strain‐optical coefficient distribution functions are assigned to
Richard S. Stein, Shigeharu Onogi, Daniel A. Keedy   +2 more
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New Nematics with High Birefringence

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1995
Abstract We prepared new compounds with the hexendiyne unit as central bridging group. The substances are nematic, with clearing temperatures much higher than those of other two ring compounds. They show the highest birefringence ever observed in liquid crystals, modest viscosities and medium dielectric anisotropy. Their stability in low polar mixtures
Y. Goto, T. Inukai, A. Fujita, D. Demus
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High Birefringent Liquid Crystals

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1995
Abstract Several liquid crystal dyes and fluorinated compounds with high birefringence are synthesized and their properties evaluated. These polar compounds are useful dopants for enhancing the dielectric anisotropy of the dialkyl diphenyl-diacetylene host.
Shin-Tson Wu, J. D. Margerum, M. S. Ho, B. M. Fung, C. S. Hsu, S. M. Chen, K. T. Tsai   +6 more
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Embedded multicore hollow fiber with high birefringence

Applied Optics, 2011
We fabricate and demonstrate a hollow fiber with multiple embedded cores (MCHF) based on a modified "suspended core-in-tube" preform technique. Its birefringence properties are controlled by the MCHF core's ovality, which could be controlled by the applied pressure and drawing temperature in the MCHF preform.
Fengjun, Tian, Libo, Yuan, Qiang, Dai, Zhihai, Liu   +3 more
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Development of low- and high-birefringence optical fibers

IEEE Journal of Quantum Electronics, 1982
The polarization properties of single-mode optical fibers are easily modified by environmental factors. While this can be exploited in a number of fiber sensor devices, it can be troublesome in applications where a stable output polarization-state is required.
Payne, D.N., Barlow, A.J., Ramskov Hansen, J.J.   +2 more
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Measurement of polarization mode dispersion in high-birefringence fibers

Optics Letters, 1983
A broadband superluminescent diode at 0.84 microm is used to measure the group-delay difference in four high-birefringence single-mode fibers. Measured values range from 0.6-0.9 nsec/km for the stress-induced birefringence fibers to 3.6 nsec/km for the elliptical-core fiber.
W K, Burns, R P, Moeller
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High birefringent fibers for stress detection

SPIE Proceedings, 2003
Initial results of study a lateral stress, static and dynamic, on a light propagation in a high birefringent fiber are presented. A permanent birefringence in optical fiber arises due to large thermal stress in the core. Ambient parameters like temperature and hydrostatic pressure influence the stress anisotropy and thus the light propagation.
Marcin Roszko, Andrzej W. Domanski, Tomasz R. Wolinski, Marek W. Sierakowski, Piotr Lesiak   +4 more
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An analysis of high birefringence fibers

Journal of Lightwave Technology, 1987
A fiber is birefringent if it has a non-circular core and/or cladding, or is subjected to anisotropic stress. As a result of anisotropic stress, the fibers become biaxial. In this work, a theoretical study on the fields and dispersion of polarization modes in biaxial fibers is presented. The analysis is based on a perturbation method.
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