WO2008049374A1 - Fibre à bande interdite tout solide à faible perte de limite et à faible perte de torsion - Google Patents

Fibre à bande interdite tout solide à faible perte de limite et à faible perte de torsion Download PDF

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Publication number
WO2008049374A1
WO2008049374A1 PCT/CN2007/070953 CN2007070953W WO2008049374A1 WO 2008049374 A1 WO2008049374 A1 WO 2008049374A1 CN 2007070953 W CN2007070953 W CN 2007070953W WO 2008049374 A1 WO2008049374 A1 WO 2008049374A1
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WIPO (PCT)
Prior art keywords
loss
fiber
low
refractive index
solid
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Application number
PCT/CN2007/070953
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English (en)
Chinese (zh)
Inventor
Weijun Tong
Qingrong Han
Honghai Wang
Huifeng Wei
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Yangtze Optical Fibre And Cable Company, Ltd.
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Application filed by Yangtze Optical Fibre And Cable Company, Ltd. filed Critical Yangtze Optical Fibre And Cable Company, Ltd.
Publication of WO2008049374A1 publication Critical patent/WO2008049374A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02295—Microstructured optical fibre
    • G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
    • G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
    • G02B6/02347—Longitudinal structures arranged to form a regular periodic lattice, e.g. triangular, square, honeycomb unit cell repeated throughout cladding

Definitions

  • the present invention relates to an all-solid-state bandgap fiber, and more particularly to an all-solid-state bandgap fiber having low constraining loss and low bending loss, which belongs to the field of optical fiber communication and optical signal processing.
  • BACKGROUND OF THE INVENTION Photonic Crystal Fiber also known as a microstructured fiber or a porous fiber, is a new type of fiber that has attracted widespread attention in recent years [JC Knight, et al. Opt. Lett., 21 (1996) p. 1547.; Errata, Opt. Lett. 22 (1997) p. 484], which has a more complex refractive index profile in its cross section.
  • the cladding region of such fibers contains different arrangements of pores throughout the entire fiber.
  • the dimensions of these holes are approximately the same order of magnitude as the wavelength of the fiber, and light waves can be confined to their core regions.
  • Photonic crystal fibers can be classified into two categories according to the light guiding mechanism [JC Knight, et al. Science, 2002, 296(5566), p276]: Total Internal Reflection (TIR) and band gap Photonic Band Gap (PBG) o Recent research [F. Luan et al. Opt. Lett. 29 (2004) p. 2369; A. Argyros et al. Opt.
  • all-solid-state bandgap fibers are more advantageous for implementing optical devices widely used in photonics, such as core-doped rare earth doped fiber amplifiers and fiber lasers, fiber grating writing, etc. .
  • they should be more advantageous in terms of optimizing splice loss and improving fiber mechanical reliability than optical fibers with air holes.
  • the light transmission is much higher than that of a conventional solid fiber, as reported in the literature [G. Bouwmans et al. Opt. Express 13 (2005) p. 8452] using a third-order bandgap loss of about 20 dB at 1550 nm.
  • the object of the present invention is to provide an all-solid-state bandgap optical fiber with low limiting loss and low bending loss for the defects of existing products, to make up for the deficiencies of existing products.
  • the technical solution of the present invention is realized as follows: It comprises a core layer and a cladding layer, characterized in that: the background material of the fiber cladding layer has a certain refractive index with a high doping material, and the basic unit of refractive index n 3 is distributed in the package. At a regular grid node of the layer, at least one strip-shaped region of low refractive index n 2 is wrapped around the highly doped region of each of the basic cells.
  • the center of the basic unit of the cladding doped portion is located at the junction of a regular hexagonal or regular quadrilateral mesh, preferably a regular hexagon.
  • the basic unit of the doped portion of the cladding layer forms a regular hexagon or a regular square circle of three or more turns, preferably 3-6 turns, more preferably 5 turns.
  • the cladding base units are centered on the highly doped material and each comprise at least one combination of a refractive index higher than the background material and a lower refractive index than the background material.
  • the refractive index of the background material ⁇ with a high refractive index material doped n. 3
  • the band-shaped region between the refractive index n 2 the typical need to meet ⁇ ⁇ ⁇ ⁇ ⁇ % ⁇ ⁇ %.
  • the refractive index of the background material r ⁇ In order to ensure that the band gap fiber has a significant improvement in the limiting loss and bending sensitivity of the low-order band gap when passing through the communication window, the refractive index of the background material r ⁇ , the refractive index n 3 with a highly doped material, the band shape Between the region refractive index n 2 , it is typical to satisfy H x ioo% ⁇ - oi%.
  • Nl Fiber diameter d of the outer annular region of depressed equivalent diameter d of a material highly doped regions 2 and 3 equivalent ratio, i.e., d 2 / d 3 ⁇ 1 .5 o a highly doped material of the present invention is primarily The yttria-doped quartz glass, the depressed material is mainly fluorine-doped quartz glass.
  • the preparation method of the present invention is a conventional method in the field of optical fiber manufacturing, in which a solid rod containing cerium oxide and a solid rod of a background material are arranged and melted together into a preform, and then drawn to form an optical fiber of the present invention.
  • the invention can be widely applied to optical devices in the field of photonics, such as a core region for conducting rare earth doped fiber amplifiers and fiber lasers, and fiber grating writing. Compared to optical fibers with air holes, it should be more advantageous in optimizing the splice loss and improving the mechanical reliability of the fiber.
  • the invention adopts a basic unit for introducing a low refractive index depressed trap layer, which effectively reduces the limiting loss of the all solid band gap optical fiber, and makes the optical fiber pass through the low order band gap window with relatively high loss.
  • the introduction of the basic unit of the low refractive index depressed cladding layer according to the present invention effectively improves the bending sensitivity of the all-solid-band gap fiber to introduce additional loss due to fiber deformation.
  • FIG. 1(a) is a schematic view of a regular hexagonal structure of the main features of the present invention.
  • FIG. 1(b) is a schematic diagram of a regular quadrilateral structure of the main features of the present invention.
  • FIG. 2(a) is a band gap diagram of a first embodiment of the present invention.
  • FIG. 2(b) is a bandgap diagram and a guide mode of the optical fiber not incorporating the main features of the present invention.
  • FIG. 3(a) is a schematic diagram showing the effect of the hexagonal number of optical fibers on the limiting loss without introducing the main features of the present invention. b)
  • FIG. 1(a) is a schematic view of a regular hexagonal structure of the main features of the present invention.
  • FIG. 1(b) is a schematic diagram of a regular quadrilateral structure of the main features of the present invention.
  • FIG. 2(a) is a band gap diagram of a first embodiment of the present invention.
  • FIG. 2(b)
  • FIG. 4 is a schematic diagram showing the influence of the thickness of the depressed cladding layer on the limiting loss according to the first embodiment of the present invention
  • FIG. Schematic diagram of relationship between critical bending radius and normalized wavelength in the first embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the working principles of the present invention and various embodiments of such optical fibers are described in detail below with reference to the accompanying drawings.
  • the present invention comprises a core and a cladding
  • the fiber cladding background material have refractive 1 with high refractive index is n doped base unit 3 located in the 3 rule cladding grid
  • at least one strip-shaped region 2 of low refractive index n 2 is wrapped around the highly doped region of each of the basic cells 3.
  • the center of the basic unit 3 of the cladding doped portion is located at the junction of the regular hexagonal grid.
  • the basic unit of the cladding doped portion forms a regular hexagon of three turns.
  • the cladding base unit is centered on the highly doped material, with a refractive index n 3 of the highly doped material > a refractive index ⁇ of the background material > a refractive index n 2 of the strip region.
  • the refractive index of the background material ⁇ with a high refractive index material doped n. 3
  • the band-shaped region between the refractive index n 2 Typical needs to meet ⁇ 2 ⁇ ⁇ % ⁇ %.
  • Nl is to ensure that the band gap fiber has a significant improvement in the limiting loss and bending sensitivity of the low-order band gap when the band gap fiber passes through the communication window, the refractive index r ⁇ of the background material, the refractive index n 3 with the highly doped material, the band Between the refractive index n 2 of the shaped region, it is typical to satisfy H x ioo% ⁇ - oi%.
  • the basic unit 3 doped with cladding quartz is arranged in a regular hexagonal structure, and the core region is arranged with a background quartz material of equal diameter to the basic unit of the cladding, and the simplest center of the basic unit is a circular highly doped region, and the outer circle is wrapped.
  • the structure in which the refractive index of d 2 is recessed into the annular region and the background material is connected as the outer layer portion.
  • a typical structural diagram is shown in Figure l(a).
  • the highly doped material is mainly yttria-doped quartz glass
  • the depressed material is mainly fluorine-doped quartz glass.
  • the preparation method of the present invention is a conventional method in the field of optical fiber manufacturing, in which a solid rod containing cerium oxide and a solid rod of a background material are arranged and melted together into a preform, and then drawn to form an optical fiber of the present invention.
  • the present invention comprises a core and a cladding, the fiber cladding background material have refractive 1, having a high refractive index material doped to n 3 of the base unit 3 located in the cladding regular grid At the junction, at least one strip-shaped region 2 of low refractive index n 2 is wrapped around the highly doped region of each of the basic cells 3.
  • the center of the basic unit 3 of the cladding doped portion is located at the junction of the regularogram grid.
  • the basic unit of the cladding doped portion forms a regularogram of three turns.
  • the cladding base unit is centered on the highly doped material, with a refractive index n 3 of the highly doped material > a refractive index ⁇ of the background material > a refractive index n 2 of the strip region.
  • the refractive index of the background material ⁇ with a high refractive index material doped n. 3, the band-shaped region between the refractive index n 2 , typically ⁇ %.
  • the basic unit doped with cladding quartz is arranged in a regular quadrilateral structure, and the core region is arranged with a background quartz material of equal diameter to the basic unit of the cladding layer, and the simplest center of the basic unit is a circular highly doped region, and the diameter of the outer circle is
  • the refractive index of d 2 is a structure in which the annular region and the background material are connected as an outer layer portion.
  • a typical structural diagram is shown in Figure l(b).
  • Fiber A a specific parameter of the first embodiment to calculate the bandgap pattern and the guiding mode of the structured fiber
  • the background material n 1 1.45
  • the depressed annular region n 2 1.4428
  • the normalized diameter is 0.8 ⁇
  • the hexagonal circle formed by the basic unit is three turns .
  • the structure effectively realizes the band gap light guiding mechanism
  • FIG. 2(a) shows the effective refractive index of the fundamental mode of the fiber in several low order band gaps.
  • Fiber B all-solid-band gap fiber
  • the highly doped region n 3 1.4958 and the normalized diameter is 0.4 ⁇ .
  • the hexagonal circle formed by the basic unit is three turns, but does not include the depressed annular zone.
  • Figure 2(b) shows the effective refractive index of the fiber-base film in several lower-order band gaps.
  • the band gap width of the present invention with a depressed ring structure is superior to the previously reported band gap structure in the low order band gap window, especially in the low order band gap window guided mode.
  • the refractive index is further away from the effective refractive index of the cladding mode.
  • a further significant feature is that the third-order band gap feature of the present invention with a depressed ring structure fiber is significantly different from the previously reported bandgap structure.
  • the loss of the bandgap fiber is mainly determined by the limiting loss of the fiber itself, which depends on the structural design of the fiber itself.
  • Figure 3(a) shows the results of the constrained loss calculations reported in the previous literature ( Figure 2(b)).
  • Fig. 3(b) is a calculation result of the limit loss of the present invention with a depressed ring structure (Fig. 2(a)).
  • the structure introduced by the present invention achieves a limiting loss of less than ldB/km in the low-order band gap window, and the limiting loss corresponding to the near normalized wavelength is only the previous literature.
  • the calculation result of the report structure is 1/10 3 ⁇ 4 , which makes it possible to operate the optical fiber of the present invention in a low-order band gap window to achieve light.
  • increasing the number of turns of the basic unit can significantly reduce the limiting loss of the fiber, but in practical applications, the diameter of the fiber cannot be infinite.
  • the solution provided by the invention effectively solves the problem of large loss of the low-order bandgap window in the all-solid-state bandgap fiber reported in the prior art from the viewpoint of the structural design of the optical fiber, and provides an increase in the number of basic unit turns to further optimize the optical fiber within a certain range.
  • the possibility of loss To further illustrate the effect of the depressed ring of the present invention on the limiting loss of the all-solid-band gap fiber, we further analyzed the effect of the normalized thickness of the depressed ring on the limiting loss. Based on the figure
  • Figure 4 shows the effect of the normalized thickness of the undercut ring on the limiting loss for the lowest limit loss in the low-order bandgap window corresponding to the normalized wavelength. It can be seen from the analysis results that under the condition that the highly doped region is constant, as the normalized thickness increases, the limiting loss of the optical fiber can be reduced by 4 to 5 orders of magnitude.
  • n m is the refractive index of the background material
  • n fm is the effective refractive index of the fundamental mode
  • n edge is the effective refractive index of the band gap side band.
  • the introduction of the depressed ring of the present invention significantly reduces the critical bending radius of the full band gap fiber by about an order of magnitude, that is, the introduction of the depressed ring of the present invention significantly improves the bending resistance of the optical fiber. .
  • the thickness of the depressed ring increases, the bending resistance of the fiber is further improved.

Abstract

La présente invention concerne une fibre à bande interdite tout solide à faible perte de limite et à faible perte de torsion qui comprend une couche centrale et une couche de gainage. Un matériau de fond de gainage de la couche de gainage de la fibre a un certain indice de réfraction n1, des unités de base avec du matériau fortement dopé et un index de réfraction n3 sont régulièrement disposées en des nœuds de la grille de la couche de gainage. La zone fortement dopée de chaque unité de base est entourée par au moins une couche de surface en forme de bande avec un indice de réfraction n2. Elle diminue efficacement la perte de limite de la fibre à bande interdite tout solide, et permet de transmettre la lumière à une fenêtre de fibre à bande interdite d'ordre inférieur dans laquelle la perte de limite est relativement élevée. Par ailleurs, la sensibilité à la torsion de la fibre à bande interdite tout solide due à la perte supplémentaire introduite par la distorsion de la fibre est améliorée de manière efficace.
PCT/CN2007/070953 2006-10-26 2007-10-25 Fibre à bande interdite tout solide à faible perte de limite et à faible perte de torsion WO2008049374A1 (fr)

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CN200610124860.1 2006-10-26
CNB2006101248601A CN100426023C (zh) 2006-10-26 2006-10-26 具有低限制损耗和低弯曲损耗的全固体带隙光纤

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100426023C (zh) * 2006-10-26 2008-10-15 长飞光纤光缆有限公司 具有低限制损耗和低弯曲损耗的全固体带隙光纤
US9120693B2 (en) * 2010-11-08 2015-09-01 Corning Incorporated Multi-core optical fiber ribbons and methods for making the same
CN102375176B (zh) * 2011-11-11 2013-10-23 江苏大学 一种低弯曲损耗光纤
CN104020521A (zh) * 2014-05-23 2014-09-03 江苏大学 一种正方结构全固态带隙光纤

Citations (6)

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CN1331808A (zh) * 1998-12-21 2002-01-16 康宁股份有限公司 光子晶体纤维
CN1382265A (zh) * 1999-10-26 2002-11-27 康宁股份有限公司 环形光子晶体纤维
US20040031435A1 (en) * 2001-06-13 2004-02-19 Park Joon Yong Method for fabricating optical fiber preform using extrusion die
WO2004053550A1 (fr) * 2002-12-09 2004-06-24 Crystal Fibre A/S Ameliorations relatives a des fibres a cristaux photoniques
US20050232560A1 (en) * 2001-12-11 2005-10-20 Blazephotonics Limited Method and apparatus relating to optical fibre waveguides
CN1945363A (zh) * 2006-10-26 2007-04-11 长飞光纤光缆有限公司 具有低限制损耗和低弯曲损耗的全固体带隙光纤

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CN1192261C (zh) * 1999-04-01 2005-03-09 Nkt研究及创新公司 光子晶体光纤及其制造方法
DE10062172A1 (de) * 2000-12-14 2002-06-20 Magcode Ag Elektromechanische Verbindungsvorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1331808A (zh) * 1998-12-21 2002-01-16 康宁股份有限公司 光子晶体纤维
CN1382265A (zh) * 1999-10-26 2002-11-27 康宁股份有限公司 环形光子晶体纤维
US20040031435A1 (en) * 2001-06-13 2004-02-19 Park Joon Yong Method for fabricating optical fiber preform using extrusion die
US20050232560A1 (en) * 2001-12-11 2005-10-20 Blazephotonics Limited Method and apparatus relating to optical fibre waveguides
WO2004053550A1 (fr) * 2002-12-09 2004-06-24 Crystal Fibre A/S Ameliorations relatives a des fibres a cristaux photoniques
CN1945363A (zh) * 2006-10-26 2007-04-11 长飞光纤光缆有限公司 具有低限制损耗和低弯曲损耗的全固体带隙光纤

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