Single polarization fibers and applications

Nolan, Daniel A.; Li, Mingjun; Chen, Xin; Koh, Joohyun

doi:10.1109/ofc.2006.215441

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…Playing with the confinement loss, on the other hand, makes it possible to reach a single-po-larization single-mode (SPSM) state with some fiber geometries [9]- [12]. These SPSM fibers are useful as polarizing elements in high-power fiber lasers, fiber optic gyroscopes, current sensors, and super luminescent sources [13]. An SPSM microstructured polymer optical fiber (mPOF) was already reported as a potential candidate for applications in ultrahigh-speed data transmissions in short distance local area networks [11].…”

Section: Introductionmentioning

confidence: 99%

Tunable Single-Polarization Single-Mode Microstructured Polymer Optical Fiber

Espinel

Franco

Cordeiro

2011

J. Lightwave Technol.

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A new procedure to obtain single-polarization singlemode polymeric optical fibers is reported. The selective polarization confinement loss mechanism is obtained by applying external hydrostatic pressure in a specially designed side-hole microstructured polymer optical fiber. It is shown that, at nm, pressure around 380 bar allows inducing confinement loss as high as 35 dB/m for one polarization state while the other is guided with low loss ( dB/m). The loss mechanism is shown to be related to coupling between the fundamental core modes and the cladding modes of the pressurized fiber. Finally, the possibility of tuning the single-polarization single-mode state with the input wavelength with fixed pressure or by introducing small changes in the inner ring of holes of the fiber cross section is presented.

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Section: Introductionmentioning

confidence: 99%

Tunable Single-Polarization Single-Mode Microstructured Polymer Optical Fiber

Espinel

Franco

Cordeiro

2011

J. Lightwave Technol.

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“…Different approaches to perform singlepolarization (SP) fiber lasers can be found in the literature [1][2][3][4][5][6]. In some of them, the SP nature of the emission relies in the polarizing properties of the fiber.…”

Section: Introductionmentioning

confidence: 99%

“…In applications like parametric conversion, interferometric fiber sensors, harmonic generation and spectroscopy of gases, light sources with high degree of polarization are required. Different approaches to perform singlepolarization (SP) fiber lasers can be found in the literature [1][2][3][4][5][6]. In some of them, the SP nature of the emission relies in the polarizing properties of the fiber.…”

Section: Introductionmentioning

confidence: 99%

“…In some of them, the SP nature of the emission relies in the polarizing properties of the fiber. Nolan et al report the fabrication of a hole-assisted SP fiber with elliptic core and its application to perform a SP fiber laser [1]. The use of fiber components with birefringent properties, such as Bragg gratings [3,4] or long period gratings [5] written in birefringent fibers, also provides differential loss for each polarization mode and leads to fiber lasers with polarized emission.…”

Section: Introductionmentioning

confidence: 99%

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Linearly polarized all-fiber laser using a short section of highly polarizing microstructured fiber

et al. 2007

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Abstract:A linearly polarized all-fiber erbium laser is presented in this work. The polarization selective element consists on a piece of a single-mode, polarizing microstructured fiber, which is placed within the laser cavity. The microstructured fiber shows a regular lattice of air-holes, in which four holes next to the core were enlarged. This fiber shows a polarization dependent loss of 16 dB/m around 1550 nm. The laser cavity presents different losses for each polarization and, as a consequence, a highly polarized emission is obtained. The polarization ratio of the emitted power was in excess of 20 dB. Angle, grad

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“…In recent years, we have proposed, implemented, and commercialized a single polarization fiber with dual air holes [1][2]. In order to achieve single polarization operation, the fiber must possess both high birefringence and fundamental mode cutoff.…”

mentioning

confidence: 99%

Wide Band Single Polarization and Polarization Maintaining Fibers

Chen

Koh

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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We propose a new fiber structure using both stress rods and air holes for making wide band single polarization fibers as well as polarization maintaining fibers, and illustrate the results through finite element modeling.Single polarization fibers (SPF) and polarization maintaining fibers (PMF) have found many applications ranging from telecom, sensor (gyroscope), and lab measurements. In recent years, we have proposed, implemented, and commercialized a single polarization fiber with dual air holes [1][2]. In order to achieve single polarization operation, the fiber must possess both high birefringence and fundamental mode cutoff. In the dual air hole fibers [1], both features are achieved with the air holes in conjunction with high refractive index in the core. While such fibers can be used with conventional fibers by properly splicing the fibers, more demanding applications such fiber lasers require larger mode area for higher power operation. To address the need of these applications, in this paper we propose a novel fiber, which utilizes both stress rods and air holes. This new fiber structure allows the use of a core with low refractive index, resulting in large mode area. The fiber can be designed as either polarization maintaining fiber or single polarization fiber depending on wavelength window.The proposed fiber structure consists of a core and a cladding containing two air holes adjacent to the core and two stress rods aligned in the perpendicular direction of the air holes as shown in Fig. 1. The parameters used to specify the fiber configuration include geometric parameters and refractive indices that are related to doping levels for the core and the stress rod. The fiber core can be specified by the core radius R core when it is round or by the semi-axial dimension in the x-direction ( "a") and in the y-direction ("b")when it is elliptical. The location and the dimension of the stress rod are specified by the center of the stress rod to the center of the fiber core distance D rod , and stress rod radius R rod . The air holes are always placed next to the core and its dimension is described by R hole . The refractive index of each part of the fiber is specified by the delta or percentage of relative refractive index to the cladding, typically formed by the pure silica. There are two delta values to be specified, which are delta of the core ∆ core , and delta of the stress rod, ∆ Rod .In this paper, all the numerical modeling was conducted by using a Finite Element Method (FEM) involving structural mechanics, and electromagnetics. In the first step, we calculate the contribution of the stress to refractive index from differential thermal expansion and translate that into anisotropic index distribution via stress-optic effect [3]. In the next step, the stress induced refractive index change is superimposed with the refractive index due to the use of different dopants at different parts of the fiber. Then the effective indices are calculated for both polarizations of the fundamental mode similarly to tha...

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Single polarization fibers and applications

Abstract: Single polarization fibers are designed so that one polarization propagates, while the other is cut off. Several classes of index profiles can be used. Applications include new transmission systems, sensors, and components.

Cited by 9 publications

References 14 publications

Tunable Single-Polarization Single-Mode Microstructured Polymer Optical Fiber

Tunable Single-Polarization Single-Mode Microstructured Polymer Optical Fiber

Linearly polarized all-fiber laser using a short section of highly polarizing microstructured fiber

Wide Band Single Polarization and Polarization Maintaining Fibers

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