WO2001047822A1 - Guide d'ondes a faible pic d'absorption d'eau et procede de fabrication associe - Google Patents

Guide d'ondes a faible pic d'absorption d'eau et procede de fabrication associe Download PDF

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Publication number
WO2001047822A1
WO2001047822A1 PCT/US2000/030496 US0030496W WO0147822A1 WO 2001047822 A1 WO2001047822 A1 WO 2001047822A1 US 0030496 W US0030496 W US 0030496W WO 0147822 A1 WO0147822 A1 WO 0147822A1
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WO
WIPO (PCT)
Prior art keywords
precursor body
core
soot
glass
region
Prior art date
Application number
PCT/US2000/030496
Other languages
English (en)
Inventor
Dana C. Bookbinder
Daniel W. Hawtof
Dale R. Powers
Original Assignee
Corning Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Incorporated filed Critical Corning Incorporated
Priority to AU15853/01A priority Critical patent/AU1585301A/en
Publication of WO2001047822A1 publication Critical patent/WO2001047822A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/07—Impurity concentration specified
    • C03B2201/075—Hydroxyl ion (OH)
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
    • C03B2201/22—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with deuterium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/29—Segmented core fibres
    • 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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
    • G02B6/03644—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - + -
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates generally to the field of optical waveguide fibers, and more particularly to optical waveguide fiber preforms and methods of making optical waveguide fiber preforms from which low water peak optical waveguide fibers are formed.
  • a significant goal of the telecommunications industry is to transmit greater amounts of information, over longer distances, in shorter periods of time.
  • demand for system resources increases as well.
  • One way of meeting this demand is by increasing the bandwidth of the medium used to carry this information over long distances.
  • the demand for optical waveguide fibers having increased bandwidth is particularly high.
  • optical waveguide fiber In recent years, significant advancements have been made in the manufacture of optical waveguide fiber, which in turn have increased the usable light carrying capacity of the fiber.
  • electromagnetic radiation traveling through an optical waveguide fiber is subject to attenuation or loss due to several mechanisms. Although some of these mechanisms can not be reduced, others have been eliminated, or at least substantially reduced.
  • a particularly problematic component of optical fiber attenuation is the attenuation due to absorption by the optical waveguide fiber of impurities present in the light guiding region of the fiber. Particularly troublesome is the attenuation caused by the hydroxyl radical (OH), which can be formed in the optical waveguide fiber when a source of hydrogen is present in the fiber material, or when hydrogen available from several sources during the fiber manufacturing process diffuses into the glass.
  • OH hydroxyl radical
  • the attenuation increase due to OH or water in the glass can be as high as about 0.5 to 1.0 dB/km or higher, with the attenuation peak generally occupying the 1380nm window.
  • 1380nm window is defined as the range of wavelengths between about 1330nm to about 1470nm.
  • One aspect of the present invention relates to a method of fabricating a cylindrical glass body for use in manufacturing optical waveguide fiber.
  • the method includes the steps of chemically reacting at least some of the constituents of a moving fluid mixture that includes at least one glass forming precursor compound in an oxidizing medium to form a silica-based reaction product.
  • the silica-based reaction product is consolidated into a silica-based glass precursor body for use in manufacturing optical waveguide fiber.
  • the silica-based glass body includes at least a portion of what will become the core region of the optical fiber preform.
  • the silica-based glass precursor body is a core cane, which preferably is formed by OVD deposition techniques.
  • the consolidated glass precursor body Prior to having additional core and/or cladding material formed on the precursor body, the consolidated glass precursor body is exposed to deuterium gas. Additional core and/or cladding material is then applied, preferably via OVD techniques, onto the precursor body to form an optical fiber preform.
  • the glass precursor body is preferably exposed to a mixture of deuterium in a gas selected from the group consisting of helium, argon, neon, nitrogen or other inert gases or mixtures thereof.
  • the deuterium exposing step is carried out for a time and at a temperature sufficient to prevent OH formation in the glass precursor body prior to or during formation of the remainder of the optical fiber preform, especially when OVD techniques are use to deposit the remainder of the cladding.
  • the deuterium treatment step is also preferably carried out for a time and at a temperature that is sufficient so that, when said precursor body is used to form an optical fiber preform, and an optical fiber is drawn therefrom, the attenuation of said optical fiber at 1380 is less than about
  • the core region is formed and drawn into a consolidated glass core cane.
  • Core cane as used herein, means a consolidated glass precursor body which must receive additional core and/or cladding material to produce a complete optical fiber preform.
  • the consolidated glass core cane includes the entire physical core region.
  • the core cane may optionally include a small portion of what will become the overall cladding of the optical fiber preform (also called a near-clad region of the core cane).
  • the small near-clad region of the core cane is preferably large enough so that, when the resultant optical fiber is drawn into a fiber, the optical core (i.e. the region in the fiber that transmits power) includes both the core and a portion of the nearclad region of the core cane.
  • the optical core i.e. the region in the fiber that transmits power
  • the near clad region would also transmit some smaller amount of power, and outside the nearclad region, no significant power would be transmitted.
  • the ratio of the physical core (e.g., in the case of standard germania doped single mode fiber, the germania doped region) to the diameter of the near clad region (i.e., the outer diameter of the core cane), i.e., the so- called core/clad ratio of the core cane, is greater than about .15, more preferably greater than bout .25, and most greater than about .30. Having a thicker near clad region on the consolidated glass core cane prior to deuterium treatment and subsequent formation of the remainder of the cladding on the core cane, helps assure that no water will be present in the light transmitting region of the resultant optical fiber. After deuterium treatment of the glass precursor body, additional soot is applied using a plurality of outside vapor deposition burners, thus increasing the productivity of optical fiber preform manufacture.
  • a core cane is formed by depositing doped glass soot onto a mandrel, and removing the mandrel to form a soot body having a hole therein.
  • the soot body may be exposed to additional dopants if desired.
  • the soot body is dried using a drying agent such as chlorine gas.
  • the resultant dried consolidated glass core cane body is treated using deuterium gas in accordance with the present invention. Subsequent to the deuterium treatment, the glass precursor body is overcladded as described above.
  • the overcladding of the glass precursor body is accomplished via an outside vapor deposition process.
  • Such overcladding of glass precursor core canes via outside vapor deposition previously would have resulted in the formation of OH within the light carrying region of the core cane, and this OH formation would detrimentally effect the light carrying properties of the optical fiber by creating increased attenuation in the 1380 window.
  • the remainder of the optical fiber preform can be formed using OVD deposition of silica, without forming detrimental OH within the light curing region of the core cane.
  • the glass precursor body is most preferably formed entirely via outside vapor deposition.
  • the soot precursor body Prior to being consolidated, the soot precursor body is dried via exposure to a drying gas, such as chlorine.
  • a drying gas such as chlorine.
  • the precursor body is dried and consolidated in the same furnace structure without removing the precursor body from the furnace structure between the drying and consolidating steps.
  • additional cladding soot is deposited via a plurality of OVD burners disposed along the length of said precursor body.
  • FIG. 1 is a perspective view of a cylindrical glass body shown depicting an optical fiber preform made of a core cane and overcladding in accordance with the present invention
  • FIG. 2 schematically illustrates the manufacture of a porous body using an outside vapor deposition process in accordance with the present invention
  • FIG. 3 is a cross-sectional view of the porous body of FIG. 2 shown suspended within a consolidation furnace;
  • FIG. 4 is a cross-sectional view of a sintered glass preform resulting from consolidation of the porous body depicted in FIG. 4 shown being drawn into a reduced diameter core cane.
  • FIG. 5 is a core cane being hung in a furnace to receive a deuterium treatment in accordance with the invention.
  • FIG. 6 illustrates a schematic of an optical fiber having more complex refractive index profile made in accordance with the present invention.
  • optical fiber preform 20 includes a core region 22, clad or near clad region 24, and over clad region 26.
  • Core region 22 may include index of refraction varying dopants such as germanium, fluorine, and other known dopants which may be used to raise or lower the index of refraction of the core region 22.
  • the near clad region 24 and over clad region 26 are typically made of pure silica, although dopants could be employed in this region as well, as long as the relative refractive index of the overall clad regions 24 and 26 is lower than that of core region 22, so that the resultant optical fiber will guide light.
  • Core region 22 is the physical core region of the optical fiber, meaning that it is the region in which the majority of light is guided along the fiber. Such a region can be formed by employing index of refraction increasing dopants within the core region 22, or index of refraction decreasing dopants outside the core region 22.
  • the physical core region is delimited by the presence or absence of these index of refraction increasing dopants that cause the majority of light to be guided in the core.
  • a consolidated glass core cane is first made which consists at least of core region 22 and preferably also includes near clad region 24.
  • core canes could be manufactured using a variety of methods known in the art, including, but not limited to, outside vapor deposition (OVD), vapor axial deposition (VAD), inside process (IV), or modified chemical vapor deposition (MCVD), or plasma vapor deposition (PCVD).
  • ODD outside vapor deposition
  • VAD vapor axial deposition
  • IV inside process
  • MCVD modified chemical vapor deposition
  • PCVD plasma vapor deposition
  • the consolidated glass core cane is then treated with deuterium in accordance with the invention, after which a consolidated glass overclad region 24 is formed on the core cane to form a complete optical fiber preform.
  • optical fiber preform 20 is formed by chemically reacting at least some of the constituents of a moving fluid mixture including at least one glass-forming precursor compound in an oxidizing medium to form a silica-based reaction product. At least a portion of this reaction product is directed toward a substrate, to form a porous body, at least a portion of which includes hydrogen bonded to oxygen.
  • the porous body may be formed, for example, by depositing layers of soot onto a mandrel or bait rod via an OVD process. Such an OVD process is illustrated in FIG. 2. As shown in FIG. 2, a bait rod or mandrel 30 is inserted through a tubular handle 32 and mounted on a lathe (not shown).
  • the lathe is designed to rotate mandrel 30 in close proximity with a soot-generating burner 34.
  • silica-based reaction product 36 known general y as soot
  • mandrel 30 is rotated and reciprocated back and forth with respect to the burner 34
  • silica-based reaction product 36 known general y as soot
  • At least a portion of silica-based reaction product 36 is deposited on mandrel 30 and on a portion of handle 32 to form a porous body 38 thereon. While this aspect of the present invention has been described in conjunction with a mandrel 30 that is traversed by a lathe, it will be understood by those skilled in the art that soot generating burner 34 can traverse rather than mandrel 30.
  • this aspect of the present invention is not intended to limit soot deposition to an OVD process.
  • other methods of chemically reacting at least some of the constituents of a moving fluid mixture such as, but not limited to, liquid delivery of at least one glass-forming precursor compound in an oxidizing medium can be used to form the silica-based reaction product of the present invention, as disclosed, for example, in U.S. Provisional Patent Application Serial No. 60/095,736, filed on August 7, 1997, and PCT Application Serial No. PCT/US98/25608, filed on December 3, 1998, the contents of which are hereby incorporated by reference.
  • other processes such as the inside vapor (IV) deposition process, and modified chemical vapor deposition (MCVD) process are also applicable to the present invention.
  • soot deposition is terminated and mandrel 30 is removed from porous body 38.
  • porous body 38 defines a centerline hole 40 passing axially therethrough.
  • an OVD process is employed to make an initial soot precursor body consisting of core region 22 and near clad region 24.
  • the resultant soot precursor body 28 is then dried and consolidated into a consolidated glass precursor body.
  • Core region 22 is the physical core which includes an index of refraction which is higher than that of cladding regions 24 and 26.
  • the core region 22 may consist of various combinations of germanium and fluorine dopant levels. While the raised index of refraction in the core region 22 causes the majority of light to propagate in the physical core region 22, small amounts of light will also propagate in the region adjacent core region 22, namely near-clad region 24 (and, if near-clad region 24 is thin enough, also in over-clad region 26). Consequently, it is important that OH species be removed from both core region 22 and any portion of near-clad region 24 or overclad region 26 that will propagate any significant amount of the light intensity along the length of optical fiber.
  • both the core region 22 and all of the near clad region 24 that will transmit any of the light along the optical fiber is formed in a first OVD process as illustrated in FIG. 1.
  • the resultant soot precursor body 28 is then dried and consolidated into a consolidated glass precursor body.
  • porous body 38 is suspended by handle 32 on a downfeed handle 42 and positioned within a consolidation furnace 44.
  • the end of centerline hole 40 remote from handle 32 may be fitted with a bottom plug 46 prior to positioning porous body 38 within consolidation furnace 44.
  • Porous body 38 is preferably chemically dried, for example, by exposing porous body
  • Chlorine containing atmosphere 50 effectively removes water and other impurities from porous body 38, which otherwise would have an undesirable effect on the properties of optical waveguide fiber manufactured from porous body 38.
  • the chlorine flows sufficiently through the soot to effectively dry the entire blank, including the region surrounding centerline hole 40.
  • the temperature of the furnace is elevated to a temperature sufficient to consolidate the soot blank into a sintered glass preform, typically about 1500° C.
  • centerline hole 40 is closed, either during or following the consolidation step, under conditions suitable to result in a solid sintered glass body that can be further processed to form an optical waveguide fiber exhibiting optical attenuation of less than about 0.35 dB/km, and preferably less than about 0.31 dB/km at a wavelength of 1380nm.
  • centerline region 24 has a weighted average OH content of less than about 1 ppb.
  • optical waveguide fibers manufactured using such preforms exhibited excessively high levels of optical attenuation in the 1380 nm window. It has since been found that this high attenuation, known generally as the "water peak", is largely due to absorption of water by that portion of the glass preform surrounding the centerline hole prior to centerline hole closure. While not wishing to be bound by theory, it is believed that physisorbed water (H 2 O) in the glass bounding the centerline hole results substantially instantaneously when the glass is exposed to an atmosphere containing a hydrogen compound such as, but not limited to water (H 2 O). Moreover, the greater the exposure time, the greater the amount of water absorbed by the glass.
  • H 2 O physisorbed water
  • any exposure to ambient atmosphere, or any atmosphere containing a hydrogen compound no matter how short the period of time, will rewet that portion of the glass preform bounding the centerline hole.
  • Such rewetting provides the impurities that cause the water peak exhibited by optical waveguide fibers manufactured using standard fiber manufacture processing techniques from blanks formed by an OVD process.
  • closure of the core cane centerline hole is performed under the drying conditions such as those discussed herein which are suitable to result in a solid glass body that can be used to manufacture an optical waveguide fiber that exhibits optical attenuation of less than about 0.31 dB/km at a wavelength of
  • 1380nm can be facilitated in a number of ways.
  • exposure of the centerline hole to an atmosphere containing a hydrogen compound is prevented following the steps of chemically drying and consolidating the porous body.
  • the centerline hole does not have an opportunity to be rewet prior to centerline hole closure.
  • water contained within the portion of the sintered glass preform surrounding the centerline hole as a result of rewetting following consolidation is chemically removed from the glass prior to centerline hole closure, preferably at redraw.
  • rewetting of the glass bounding the centerline hole can be significantly reduced by closing the centerline hole during consolidation.
  • the end of centerline hole 40 remote from handle 32 is fitted with a glass plug 46 prior to the consolidation step.
  • This may be achieved, for example, by lowering porous body 38 subsequent to or during drying a hot zone (not shown) of consolidation furnace 44.
  • the elevated temperature, preferably about 1500° C, in the hot zone sinters porous body 38 as it enters the hot zone.
  • the inwardly directed sintering forces reduce the diameter of porous body 38 thereby closing porous body 38 onto plug 46 to effectively seal one end of centerline hole 40.
  • Porous body 38 is further down driven into the hotter zone of the furnace to sinter the remainder of porous body
  • Closing of the hole 40 may be facilitated by exposing centerline hole 40 to a vacuum, for example, an absolute pressure of no more than 10 Torr, more preferably no more than 100 mTorr, through an inner handle 52, which communicates with centerline hole 40 through handle 32.
  • a vacuum for example, an absolute pressure of no more than 10 Torr, more preferably no more than 100 mTorr
  • the sintered glass preforms formed as described above are suspended within a furnace 68 by downfeed handles 42 as illustrated in FIG. 4.
  • the temperature within furnace 68 is elevated to a temperature which is sufficient to stretch the glass preforms, preferably about 1950°C to about 2100°C, and thereby reduce the diameters of the preforms to form a cylindrical glass body such as a rod or core cane.
  • sintered glass preform 70 corresponding to porous body 38 depicted in FIG. 3 and having a closed centerline region 72, is heated, preferably in an inert gas atmosphere such as He, and stretched to form a reduced diameter 74 having a centerline region 76 extending axially therethrough.
  • the core cane 76 is treated in an atmosphere preferably containing greater than 2% and less than 50% by volume, and more preferably greater than 4% and less than 15% deuterium gas by volume, the remainder of the gas being made up of helium or argon.
  • the furnace is held at a temperature of at least 600°C, more preferably greater than 800°C, and most preferably 1000°C or higher.
  • additional core clad 26 may be deposited onto core cane 76 to complete the optical fiber preform.
  • additional cladding material 26 may be deposited, for example, using the process described above with respect to FIG. 2, only this time instead of the soot 36 being deposited onto mandrel 30 the soot 36 would be deposited onto core cane 76 which has been previously treated with deuterium gas.
  • the additional over-clad region 26 is preferably deposited via a plurality of OVD soot deposition burners positioned along the length of core cane 76.
  • core canes 76 which are comprised of an entire core region and a near-clad region.
  • FIG. 6 illustrates an optical fiber 20 having a core refractive index profile 80 (shown schematically across the width of the preform) which is more complex than standard single mode fiber.
  • Such optical fibers could be made using a variety of methods.
  • such profiles are made using an OVD process in which central core region 82, which is comprised of germania doped silica, is first made using the process described above with respect to FIG. 2-4, to thereby form a core cane having a refractive index profile as illustrated in core segment 82.
  • This first core cane region 82 is then deuterium treated in accordance with the invention.
  • the second, and adjacent core region 84 can then be formed by forming a soot body 28 as illustrated in FIG. 2, removing this soot body 28 from mandrel 30, and then doping this soot body using fluorine prior to consolidation.
  • the consolidated core cane 82 could then be inserted into the fluorine doped soot body 84 and the resultant structure consolidated to form a second core cane body consisting of the central core segment 82 and second core segment 84.
  • This second core cane also preferably receives the deuterium pretreatment step, before having additional soot deposited via an OVD process, as illustrated in FIG.
  • third core segment 86 to form the remainder of the core refractive index profile 80, and a near clad region outside of the annular germania doped region, thereby forming third core segment 86.
  • the additional soot could then be consolidated into glass, redrawn into a third core cane, consisting of regions 82, 84, and 86 which is treated with deuterium in accordance with the present invention before receiving over clad material 78 which completes the optical fiber preform.
  • the resulting solid sintered glass preform can then be removed from consolidation furnace 44 and stored for further processing at a later time, or moved to a redraw furnace where it can be drawn into a reduced diameter cane.
  • centerline hole 40 is closed (i.e., the sintered glass preform has a solid centerline region), the centerline region will not be exposed to ambient atmosphere and thus will not be rewet upon removal from consolidation furnace 44.
  • EXAMPLES The invention will be further clarified by the following examples, which are intended to be exemplary of the invention. For each example set forth below, it will be understood that distances are described as being measured from the top of the furnace muffle.
  • the blank was initially pre-purged for approximately
  • a vacuum pump communicating with the centerline was activated to reduce the pressure within the centerline hole. Vacuum continued to be drawn until the bottom of the blank reached a depth of 2730 mm and the top portion of the blank closed on the top plug, thereby sealing the centerline hole.
  • the sealed sintered preform was then drawn into a solid cane having a diameter of about 12.1 mm in a redraw furnace. Prior to overcladding, the core canes were subjected to various deuterium pretreatments, as illustrated in Table 1 below.
  • the cane was then overclad with additional silica soot using OVD techniques, consolidated into a optical fiber preform, and drawn into optical fiber.
  • the resultant peak loss at 1380 compared to untreated core cane is illustrated in Table 1.

Abstract

L'invention concerne un corps de verre cylindrique doté d'un noyau à faible contenu d'eau et d'une région proche de la gaine ainsi qu'un procédé de fabrication d'un tel corps de verre cylindrique à utiliser dans la fabrication de fibre pour guide d'ondes optique. De préférence, le corps de verre est fabriqué au moyen d'un procédé extérieur d'oxydation en phase vapeur, une tige d'ébauche étant formée dans un premier temps, de préférence au moyen de procédés extérieurs d'oxydation en phase vapeur. La tige d'ébauche est ensuite traitée avec du gaz deutérium avant que l'on applique un matériau de noyau et/ou de gaine supplémentaire à la tige d'ébauche. Grâce à l'utilisation de ces techniques, on peut obtenir des ébauches de fibre optique dotées d'un noyau et d'une région proche de la gaine présentant un contenu d'eau suffisamment faible de manière à ce qu'une fibre pour guide d'ondes optique fabriquée à partir du corps de verre cylindrique selon la présente invention présente une atténuation optique inférieure à environ 0,35 dB/km, et de préférence, inférieure à environ 0,31 dB/km à une longueur d'onde mesurée à 1380nm.
PCT/US2000/030496 1999-12-28 2000-11-03 Guide d'ondes a faible pic d'absorption d'eau et procede de fabrication associe WO2001047822A1 (fr)

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AU15853/01A AU1585301A (en) 1999-12-28 2000-11-03 Low water peak optical waveguide and method of manufacturing same

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Application Number Priority Date Filing Date Title
US17326999P 1999-12-28 1999-12-28
US60/173,269 1999-12-28

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004031085A1 (fr) * 2002-09-30 2004-04-15 Corning Incorporated Procede de traitement au deuterium d'une preforme de fibre optique
NL1021992C2 (nl) * 2002-11-26 2004-05-27 Draka Fibre Technology Bv Werkwijze ter vervaardiging van een vormdeel.
CN1330597C (zh) * 2003-10-21 2007-08-08 江苏法尔胜光子有限公司 管内化学汽相沉积工艺制备低羟基含量光纤预制棒的方法
US7426327B2 (en) 2005-11-23 2008-09-16 Corning Incorporated Low attenuation non-zero dispersion shifted optical fiber
US7450807B2 (en) 2006-08-31 2008-11-11 Corning Incorporated Low bend loss optical fiber with deep depressed ring
US7555187B2 (en) 2007-05-07 2009-06-30 Corning Incorporated Large effective area fiber
US7603015B2 (en) 2007-02-28 2009-10-13 Corning Incorporated Optical fiber with large effective area
US7620282B2 (en) 2006-08-31 2009-11-17 Corning Incorporated Low bend loss single mode optical fiber
US7773848B2 (en) 2008-07-30 2010-08-10 Corning Incorporated Low bend loss single mode optical fiber
US7853110B2 (en) 2007-11-28 2010-12-14 Corning Incorporated Large effective area optical fiber
US7889960B2 (en) 2008-05-06 2011-02-15 Draka Comteq B.V. Bend-insensitive single-mode optical fiber
US7899293B2 (en) 2006-04-10 2011-03-01 Draka Comteq, B.V. Single-mode optical fiber
US7995889B2 (en) 2005-11-10 2011-08-09 Draka Comteq, B.V. Single mode optical fiber
WO2011106293A1 (fr) 2010-02-26 2011-09-01 Corning Incorporated Fibre optique à faibles pertes par courbures
US8145027B2 (en) 2007-11-09 2012-03-27 Draka Comteq, B.V. Microbend-resistant optical fiber
WO2013082062A1 (fr) 2011-11-29 2013-06-06 Corning Incorporated Fibre optique à faibles pertes par courbure
WO2014101949A1 (fr) 2012-12-28 2014-07-03 Prysmian S.P.A. Procédé de fabrication de préformes pour fibres optiques à faible pic d'absorption d'eau
WO2014101948A1 (fr) 2012-12-28 2014-07-03 Prysmian S.P.A. Procédé de fabrication de préformes pour fibres optiques à faible pic d'absorption d'eau
US9383511B2 (en) 2013-05-02 2016-07-05 Corning Incorporated Optical fiber with large mode field diameter and low microbending losses
US20220098084A1 (en) * 2020-05-20 2022-03-31 Corning Incorporated Methods for increasing deposition in a flame hydrolysis deposition process
CN114853330A (zh) * 2022-04-07 2022-08-05 长飞光纤潜江有限公司 一种大尺寸低水峰光纤预制棒的制造方法
US11634351B2 (en) * 2019-08-13 2023-04-25 Sterlite Technologies Limited Method for sintering of optical fibre preform

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US4515612A (en) * 1982-04-19 1985-05-07 At&T Bell Laboratories Method for optical fiber fabrication including deuterium/hydrogen exchange

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515612A (en) * 1982-04-19 1985-05-07 At&T Bell Laboratories Method for optical fiber fabrication including deuterium/hydrogen exchange

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004031085A1 (fr) * 2002-09-30 2004-04-15 Corning Incorporated Procede de traitement au deuterium d'une preforme de fibre optique
NL1021992C2 (nl) * 2002-11-26 2004-05-27 Draka Fibre Technology Bv Werkwijze ter vervaardiging van een vormdeel.
CN1330597C (zh) * 2003-10-21 2007-08-08 江苏法尔胜光子有限公司 管内化学汽相沉积工艺制备低羟基含量光纤预制棒的方法
US8837889B2 (en) 2005-11-10 2014-09-16 Draka Comteq, B.V. Single mode optical fiber
US7995889B2 (en) 2005-11-10 2011-08-09 Draka Comteq, B.V. Single mode optical fiber
US7426327B2 (en) 2005-11-23 2008-09-16 Corning Incorporated Low attenuation non-zero dispersion shifted optical fiber
US8103143B2 (en) 2006-04-10 2012-01-24 Draka Comteq, B.V. Single-mode optical fiber
US7899293B2 (en) 2006-04-10 2011-03-01 Draka Comteq, B.V. Single-mode optical fiber
US7903917B2 (en) 2006-08-31 2011-03-08 Corning Incorporated Low bend loss single mode optical fiber
US7450807B2 (en) 2006-08-31 2008-11-11 Corning Incorporated Low bend loss optical fiber with deep depressed ring
US7620282B2 (en) 2006-08-31 2009-11-17 Corning Incorporated Low bend loss single mode optical fiber
US7603015B2 (en) 2007-02-28 2009-10-13 Corning Incorporated Optical fiber with large effective area
US7555187B2 (en) 2007-05-07 2009-06-30 Corning Incorporated Large effective area fiber
US8145027B2 (en) 2007-11-09 2012-03-27 Draka Comteq, B.V. Microbend-resistant optical fiber
US8385705B2 (en) 2007-11-09 2013-02-26 Draka Comteq, B.V. Microbend-resistant optical fiber
US7853110B2 (en) 2007-11-28 2010-12-14 Corning Incorporated Large effective area optical fiber
US7889960B2 (en) 2008-05-06 2011-02-15 Draka Comteq B.V. Bend-insensitive single-mode optical fiber
US8131125B2 (en) 2008-05-06 2012-03-06 Draka Comteq, B.V. Bend-insensitive single-mode optical fiber
US8145025B2 (en) 2008-05-06 2012-03-27 Draka Comteq, B.V. Single-mode optical fiber having reduced bending losses
US8428414B2 (en) 2008-05-06 2013-04-23 Draka Comteq, B.V. Single-mode optical fiber having reduced bending losses
US7773848B2 (en) 2008-07-30 2010-08-10 Corning Incorporated Low bend loss single mode optical fiber
WO2011106293A1 (fr) 2010-02-26 2011-09-01 Corning Incorporated Fibre optique à faibles pertes par courbures
WO2013082062A1 (fr) 2011-11-29 2013-06-06 Corning Incorporated Fibre optique à faibles pertes par courbure
US8849082B2 (en) 2011-11-29 2014-09-30 Corning Incorporated Low bend loss optical fiber
WO2014101949A1 (fr) 2012-12-28 2014-07-03 Prysmian S.P.A. Procédé de fabrication de préformes pour fibres optiques à faible pic d'absorption d'eau
WO2014101948A1 (fr) 2012-12-28 2014-07-03 Prysmian S.P.A. Procédé de fabrication de préformes pour fibres optiques à faible pic d'absorption d'eau
US9383511B2 (en) 2013-05-02 2016-07-05 Corning Incorporated Optical fiber with large mode field diameter and low microbending losses
US10094973B2 (en) 2013-05-02 2018-10-09 Corning Incorporated Optical fiber with large mode field diameter and low microbending losses
US11634351B2 (en) * 2019-08-13 2023-04-25 Sterlite Technologies Limited Method for sintering of optical fibre preform
US20220098084A1 (en) * 2020-05-20 2022-03-31 Corning Incorporated Methods for increasing deposition in a flame hydrolysis deposition process
CN114853330A (zh) * 2022-04-07 2022-08-05 长飞光纤潜江有限公司 一种大尺寸低水峰光纤预制棒的制造方法

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