High birefringence in elliptical hollow optical fiber

Hwang, Inseok; Lee, Yong Hee; Oh, Kyunghwan; Payne, D.N.

doi:10.1364/opex.12.001916

Cited by 48 publications

(31 citation statements)

References 11 publications

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“…However, REIM, being a scalar approach, does not reveal information about the polarization-dependent modal properties of the fiber, which is important for applications and devices sensitive to polarization. There have been several studies on the vectorial analysis of the optical fibers [6][7][8][9][10][11][12][13]. In this paper, we carry out a full vectorial analysis of the SCF using the vectorial finite element method (VFEM).…”

Section: Introductionmentioning

confidence: 99%

Birefringence analysis of segmented cladding fiber

et al. 2012

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. We present a full-vectorial modal analysis of a segmented cladding fiber (SCF). The analysis is based on the H-field vectorial finite element method (VFEM) employing polar mesh geometry. Using this method, we have analyzed the circular SCF and the elliptical SCF. We have found that the birefringence of the circular SCF is very small (1.0 × 10 −8 ). Birefringence of a highly elliptical SCF can be altered to some extent by the number of segments and duty cycle of segmentation in the segmented cladding. However, the change is not profound. The analysis shows that the circular SCF possesses low birefringence and that the segmented cladding does not add any significant birefringence in an elliptical fiber. This result strongly indicates that small deviations in the segmented cladding parameters arising from fabrication process do not significantly affect the birefringence of the fiber. Permanent repository link

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Section: Introductionmentioning

confidence: 99%

Birefringence analysis of segmented cladding fiber

et al. 2012

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“…Hwang et al proposed a fiber, which is a triple layered structure having a central elliptical air hole surrounded by GeO2-doped silica elliptical core and circular silica cladding [6]. This fiber exhibits high birefringence because of the large index contrast between central air hole and core [6].…”

Section: Theory Of Analysismentioning

confidence: 99%

“…This fiber exhibits high birefringence because of the large index contrast between central air hole and core [6].…”

Section: Theory Of Analysismentioning

confidence: 99%

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Birefringence and dispersion properties of elliptical hollow core optical fiber under hydrostatic pressure

Zubair

Siddiqui

Alam

2009

TENCON 2009 - 2009 IEEE Region 10 Conference

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Highly birefringent elliptical hollow core optical fiber under hydrostatic pressure is analyzed in this work using finite element method. The combined effects of thermal stress generated during fabrication and external applied stress have been considered. Birefringence increases while group velocity dispersion decreases when the fiber is under hydrostatic pressure. Higher birefringence, lower material dispersion and moderate effective area can make this fiber attractive for under water communication system.

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“…Recent progress in Hi-Bi PCFs has resulted in birefringence as high as the order of 10 -2 in a single mode operation [1,2]. Recently, we proposed and theoretically analyzed a novel design of highly birefringent elliptical hollow optical fiber (EHOF) composed of simple triple layer structure; a central elliptical air hole, a circumferential elliptical ring core, and a circular cladding [3]. Due to the large refractive index contrast between the ring core and the air hole (0.45), the high birefringence can be achieved with a relatively small index difference between the core and the cladding (∆n) .…”

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confidence: 99%

Flexible control of geometrical birefringence in elliptical hollow optical fiber

Jung

Han

Kim

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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We fabricated and experimentally characterized an elliptical hollow optical fiber using a new deposition technique over a flat face silica substrate tube. The fiber provided an extremely high group birefringence of 2.35ⅹ10 at 1550nm. -3 Over the last few years, photonic crystal fibers (PCFs) have opened a new way of producing a high birefringence, an order of magnitude higher than in conventional polarization maintaining fibers (PMFs) [1-2]. PCFs take advantage of the fabrication of anisotropic claddings, high elliptic cores and more importantly the high index contrast between silica and air. Recent progress in Hi-Bi PCFs has resulted in birefringence as high as the order of 10 -2 in a single mode operation [1,2]. Recently, we proposed and theoretically analyzed a novel design of highly birefringent elliptical hollow optical fiber (EHOF) composed of simple triple layer structure; a central elliptical air hole, a circumferential elliptical ring core, and a circular cladding [3]. Due to the large refractive index contrast between the ring core and the air hole (0.45), the high birefringence can be achieved with a relatively small index difference between the core and the cladding (∆n) .Generally, the elliptical core fiber is fabricated by drawing a preform whose sides are removed to a certain depth at a high temperature in order to make the fiber round by surface tension. However, high drawing temperature make it easy to seal the central air hole and prone to circular-shaped air hole caused by the high positive pressure in the case of HOF. In order to cope with the problem we have demonstrated a new technique to provide anisotropy into a round preform, for the first time to the best knowledge of authors. Firstly the silica substrate tube is cut to provide two flat surfaces, then the core layers are deposited over the prepared tube using modified chemical vapor deposition (MCVD) process. The tube is then partly collapsed at high temperature to deform the tube into round cross-section leaving behind elliptic hole and ring core, which eliminates high temperature drawing requirement. In this paper, we experimentally demonstrate that elliptical hollow optical fiber becomes feasible to create flexible high group birefringence with the control of air hole size. Fig.1 (a) Structure of the EHOF with the core consisting of an elliptical air hole and (b) Near-field pattern of the guided mode (λ=632.8 nm) Figure 1 shows the schematic design and near-field pattern of the guide mode of an EHOF fabricated by our method. An elliptical air hole at the center is concentric to the circumferential elliptical ring core. The birefringence in the EHOF arises from the boundary conditions for electromagnetic fields at the elliptical core-hole interface. The diameters of the minor axis (2a hole ) and major axis (2b hole ) of air hole characterize the geometrical birefringence of EHOF [4]. The proposed fabrication process was found to effectively produce high ellipticity in the ring core, and air hole and flexiblely control the air hole s...

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High birefringence in elliptical hollow optical fiber

Cited by 48 publications

References 11 publications

Birefringence analysis of segmented cladding fiber

Birefringence analysis of segmented cladding fiber

Birefringence and dispersion properties of elliptical hollow core optical fiber under hydrostatic pressure

Flexible control of geometrical birefringence in elliptical hollow optical fiber

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