CN1293008C - Substrate tube and process for producing a preform for an optical fiber - Google Patents
Substrate tube and process for producing a preform for an optical fiber Download PDFInfo
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- CN1293008C CN1293008C CNB008195862A CN00819586A CN1293008C CN 1293008 C CN1293008 C CN 1293008C CN B008195862 A CNB008195862 A CN B008195862A CN 00819586 A CN00819586 A CN 00819586A CN 1293008 C CN1293008 C CN 1293008C
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- substrate tube
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- 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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01884—Means for supporting, rotating and translating tubes or rods being formed, e.g. lathes
- C03B37/01892—Deposition substrates, e.g. tubes, mandrels
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- 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
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- 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
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- 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
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
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- 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
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
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- 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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/36—Dispersion modified fibres, e.g. wavelength or polarisation shifted, flattened or compensating fibres (DSF, DFF, DCF)
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- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The present invention discloses a process for producing preformed blank pieces used for optical fibers of an optical data transmission technology. On the basis of the known process for producing preformed blank pieces of optical fibers used in the optical data transmission technology, the productivity of a process for generating complicated refractive index distribution is improved by providing a quartz glass base tube. Different adulterants form in the radial direction of the base tube, core glass made by synthesizing quartz glass is introduced into the base tube, and the base tube is sleeved by a sleeve tube. The present invention also provides an applicable base tube. Only a little core glass materials are needed by the base tube for producing preformed blank pieces in the process of internal deposition or for core glass rods used in a rod-in-tube technology. In the process, one kind of the base tube is used, wherein the base tube is made by vitrifying a porous tubular SiO2 blank, and the base tube is provided with a core glass layer which is generated in the first radial part of the SiO2 blank. The first kind of adulterants for improving the refractive index of quartz glass is added to the SiO2 blank before vitrification. Since the base tube has areas with different adulterants in the radial direction, the base tube is combined with a core glass layer with the refractive index of at least 1.459.
Description
Technical field
The present invention relates to be used for producing the process of the pre-shaping blank of the optical fiber that is used for the optical data transmission technology, comprise the substrate tube that a kind of silica glass is provided, this pipe has different hotchpotchs on the radial direction, introduce the core glass of synthetic quartz glass, and with a telescopic pipe round this substrate tube.
Also have, the present invention relates to be used for producing the substrate tube of silica glass of the pre-shaping blank of the optical fiber that is used for the optical data transmission technology, wherein pre-shaping blank comprises the core glass that is centered on by a sleeve zone, the form setting with substrate tube of at least a portion in this sleeve zone, this pipe has different hotchpotchs on the radial direction.
Background technology
In general, the pre-shaping blank that is used for optical fiber has a core, and it by an encompasses of the lower material of a kind of specific refractory power.The leading process that is used for being produced by synthetic quartz glass the production of pre-shaping blank core is those processes of being made VAD (vapor phase axial deposition), OVD (outside vapor phase deposition), MCVD (improved chemical evapn deposits mutually) and PCVD (plasma chemistry vapor phase deposition) by note.In all these processes, with SiO
2Particle deposition is in a substrate and realize that vitrified mode produces core.In VAD and OVD process, the deposition of core deposited to by the outside in the substrate and carry out; Carry out and in MCVD and PCVD process, be deposited on the medial surface that is called as substrate tube.Substrate tube can form the optical activity covering or form the part of this covering.Depend on the design of optical fiber, substrate tube can be made of adulterated or plain silica glass.In addition, known and to have produced pre-shaping blank according to so-called bar and tube side method, the bar of being made by a kind of core glass has been introduced in the telescopic pipe, and managed fusion with this.Obtain optical fiber by elongating pre-shaping blank by it thus.
Depend on process, can in a process of separating (OVD, MCVD, plasma process, bar and pipe process), produce cladding glass, perhaps as in the so-called VAD process, producing cladding glass and core glass simultaneously usually.By adding suitable hotchpotch adjusting core glass and the refringence between the cladding glass.Know that fluorine and boron can reduce specific refractory power, and multiple hotchpotch is suitable for being used for improving specific refractory power, particularly germanium, phosphorus and titanium.
In a kind of simple optical fiber designs, a sleeve of being made by the silica glass that the second lower specific refractory power is arranged is round the core of being made by the silica glass that first specific refractory power is arranged.Yet, in that optical fiber is reached in the best process, particularly transmit at the same time under several wavelength and the transfer rate condition with higher, developed optical fiber designs, these optical fiber have much complicated index distribution.For example, patent document EP-A1785448 has described a kind of quartz glass optical fibre, and its optical fiber designs is called as " twin-core+double clad " design, imagines this design and can reduce so-called polarization mode dispersion.
Known a kind of process by patent document EP-A2434237, be used for producing and be applicable to the sort of pre-shaping blank and the substrate tube that is beginning to describe.This patent has been described the production of single-mode fiber, and this there optical fiber is called as " cladding type that is depressed " optical fiber.Produce the pre-shaping blank that is used for this optical fiber with inside deposition (MCVD process).For this reason, the inner cladding glass coating of deposition one deck fluoro-alloyed quartz glass on the inwall of a substrate tube at first, then one deck core glass with the silica glass of doped with Ge deposits.There the silica glass substrate tube of Shi Yonging transversal its wall thickness can have some that the zone of the doped with fluorine of different quantities is arranged.The pipe of coating is collapsed, and use the what is called " telescopic pipe " of making to surround it subsequently, form a pre-shaping blank by a kind of sleeve glass.
Although can produce optical fiber mobile chromatic dispersion or so-called dispersion compensation by means of known procedures,, it may be necessary forming a plurality of internal layers in known substrate tube.
In the sedimentary process of MCVD, the increase of the number of layer and their thickness causes the corresponding of internal diameter of substrate tube to reduce, and therefore causes reducing of internal surface.Therefore, along with the development of process, sedimentary validity reduces.Only can overcome limited degree to this situation by increasing internal diameter, this is because produce the necessary temperature of deposition with indirect heating usually.Yet the internal diameter or the wall thickness that increase substrate tube need improve outside temperature, so that keep mode of deposition on the medial surface of substrate tube.But, because the deliquescing and the viscous deformation of substrate tube do being restricted like this.Also have, with heavy-walled substrate tube or bigger substrate tube and with thick internal layer, collapsing becomes more and more difficult.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of effective and economic process, be used for producing pre-shaping blank, thereby can produce complicated index distribution in large-duty mode, and provide a kind of substrate tube that is applicable to this, in this substrate tube, only need less core glass, perhaps be used for the inside deposition process, perhaps as the core glass bar in pipe king-rod process.
According to the present invention, provide a kind of production to be used for the process of the pre-shaping blank of optical data communication technology, this process is by a kind of silica glass substrate tube is provided, described substrate tube has different hotchpotchs in the zone of radial direction, introduce the core that synthetic quartz glass is made, and with a telescopic pipe substrate pipe box is got up, it is characterized in that piped porous SiO
2Blank is provided has first radial component that contains first hotchpotch that increases the silica glass specific refractory power, the described piped porous of vitrifying SiO
2Blank is to be formed on the substrate tube that has different hotchpotchs in radial direction, and the radial component of winning is formed in the interior glass coating of described substrate tube, glass coating contains described first hotchpotch in described, in substrate tube, introduce the synthetic quartz glass core and described substrate tube collapsed forming the substrate tube that collapses that contains core, then with sleeve around the described substrate tube that collapses place and the described sleeve that collapses to form the optical fiber preform blank.
About process, the objective of the invention is on the basis of described process of when beginning, to realize, in this process, use a kind of substrate tube, this substrate tube is by the piped porous SiO that is provided with the core glass layer
2The blank vitrifying obtains, by before vitrifying first hotchpotch of the specific refractory power that improves silica glass being added to SiO
2Produced core glass in first radial component of blank.
The substrate tube that is used for this process comprises a core glass layer.The core glass layer is meant the radial component of the whole wall thickness of substrate tube, one is generally columniform part, an annular cross section is arranged, and it has certain thickness to stretch on substrate tube directly makes progress outside direction, and this part comprises a kind of hotchpotch that improves the silica glass specific refractory power.Such hotchpotch comprises for example germanium, phosphorus, chlorine, erbium and titanium.Therefore, the specific refractory power height of the plain silica glass of refractive index ratio of common core glass layer.Think that in the literature the specific refractory power of plain silica glass is at n under the measurement wavelength of 589.3nm (the D line of sodium vapor lamp)
DBetween=1.4585 and 1.4589.Substrate tube can have one or more core glass layers.Except the core glass layer, at least one additional layer is set, its doping is different with the core glass layer.Therefore, when the thickness of transversal wall is seen, substrate tube have different adulterated which floor.Not by for example the different pipe coupling of several doping being produced these layers together or by deposition glass coating on the surface of a quartz glass tube, but directly produce these layers in the making processes of porous blank or in the processing that is continuing.By with SiO
2The blank vitrifying obtains this substrate tube.
The core glass layer adds first kind of hotchpotch of the specific refractory power that improves silica glass in this blank to before vitrifying from a radial component of porous blank.Usually according to so-called ' cigarette ash process ', by means of the flame hydrolysis effect of siliceous compound and SiO
2Particle deposition produces SiO in a substrate
2Blank.In a sintering process of separating, realize porous SiO
2The vitrifying of blank, opposite with so-called direct vitrifying.Because its porousness, be easy to SiO before the vitrifying carrying out
2Blank is handled, such as cleaning, dry or additional doping.Porous SiO
2The drying of blank makes can produce the low core glass layer of OH content.
Except selected part is mixed, SiO
2Blank also can at first have equally distributed first kind of hotchpotch in its whole wall thickness, and in the process of back, remove first kind of hotchpotch by a radial component at least in part, perhaps first kind of specific refractory power increase that hotchpotch caused be completely or partially by second kind of dopant compensates, even by second kind of hotchpotch overcompensation.The distribution of hotchpotch can be that this distribution also can have a gradient, a maximum value is arranged or a minimum value is arranged uniformly in the core glass layer.
Can further carry out processing chemistry or machinery to vitrified blank, reach the predetermined surface quality or the geometrical shape of substrate tube, for example by surperficial etching or polishing, and by elongating desired last size.Under the situation that remaining core glass is made by the inside deposition (MCVD or PCVD) in substrate tube, the substrate tube of formation after inside deposition and the molectron of core glass are collapsed.Simultaneously, can the interpolation form be the additional cladding glass of so-called telescopic pipe, and stretching optical fiber.Under the situation of remaining core glass being added on the substrate tube that form is the core glass bar, the molectron of formed substrate tube with the core glass bar melted, and can add additional cladding glass with the form of outer tube (telescopic pipe).Had at substrate tube under the situation of suitable size, an additional sleeve may be unnecessary.
Can obtain being used for the optical fiber of data transmission by the pre-shaping blank of making according to the present invention, wherein the core glass layer is used for the transmission of light.At least one core glass layer is the part of complicated index distribution normally.Substrate tube provides those parts of pre-shaping blank, can't produce substrate tube before core glass itself produces in known procedures.Can produce substrate tube itself by OVD process more economical and that productivity is higher.Like this, the present invention substitutes expensive and inefficient production process for the core zone of optical fiber with the higher production method of a kind of productivity.The core glass layer that for example provided by substrate tube in the MCVD process may be additionally produced by the coated inside of substrate tube.The number of internal layer and thickness may correspondingly increase, and the shortcoming of listing above relevant with sedimentary validity of may having to accept to exist.On the contrary, in according to process of the present invention, the part of optical transport layer is provided by substrate tube.Like this, and effectively produce the large volume pre-shaping blank that has complex index of refraction to distribute with making high productivity and become possibility.The core glass layer that substrate tube provided contributes to the transmission of light, so this core glass layer belongs to the core zone of optical fiber.Therefore, reduced the quantity that needs the additional core glass of interpolation, wherein ' core glass ' represents to finish this required silica glass material in core zone under implication of the present invention.Mainly be applicable to the production of single-mode fiber according to process of the present invention, but also be applicable to the production of multimode optical fibers.
In a kind of preferred realization of process, by a kind of flame hydrolysis effect of silicon compound and SiO
2Particle deposition produces porous SiO on a carrier
2Blank, and in sedimentary process, add first kind of hotchpotch.In this case, produce substrate tube, comprise the core glass layer according to the OVD process.By the hotchpotch of such hotchpotch or a kind of compound form is added in the silicon compound, perhaps by keeping the environment that comprises first kind of hotchpotch, at deposition SiO
2Realize the interpolation of first kind of hotchpotch in the particulate process.Transversal SiO
2The uneven distribution of the wall thickness specific refractory power of blank can be by changing hotchpotch along with the time effective concentration or change temperature, by subsequently by a part of SiO
2Blank is removed first kind of hotchpotch, perhaps compensates and realizes by adopting another kind of hotchpotch to carry out part.
Can introduce core glass in the substrate tube by means of the method for pipe king-rod or by inside deposition (MCVD and PCVD), then a kind of method is preferred, because simplified the particularly production of low OH content internal layer of high purity like this.
Realize that following process is effective especially: after deposition and before vitrifying, with second kind of hotchpotch of change silica glass specific refractory power porous SiO that mixes at least
2At least one of blank second radial component.Transversal SiO
2The wall thickness of blank, second kind of hotchpotch can distribute equably, by using the liquid immersion SiO that comprises second kind of hotchpotch
2Blank or can realize such distribution of second kind of hotchpotch by gas phase diffusion especially simple and economically.This makes the specific refractory power that produces complexity become easy.After vitrifying, the core glass layer can comprise the mixing of first kind of hotchpotch and second kind of hotchpotch.
By heating SiO
2Blank is exposed to it in the environment that comprises second kind of hotchpotch, can advantageously realize the doping to second radial zone.This process (back becomes it ' gas phase doping process ') makes with second kind of hotchpotch SiO that mixes especially effectively and equably
2Blank becomes possibility.
Preferably adopt fluorine as second kind of hotchpotch.Fluorine reduces the specific refractory power of silica glass.To porous SiO
2One of blank or its radial zone mix and have simplified the making of the substrate tube that the complex index of refraction distribution is arranged.Therefore, after vitrifying, substrate tube can have a covering, and this covering has the specific refractory power lower than silica glass.Such substrate tube is specially adapted to produce the single-mode fiber (so-called DC optical fiber) of compensation of dispersion.The index distribution of this optical fiber generally comprises a zone and the zone that specific refractory power is high that specific refractory power is low.Compare with known procedures, adopt according to process of the present invention and make such optical fiber especially effectively and simple, be: can make two zones entirely or available at least in part by substrate tube.
Advantageously, the germanic compound of a kind of bag is used as first kind of hotchpotch.Germanium in silica glass with germanium oxide GeO
2Form exist.Because its transmission performance, germanium oxide is specially adapted to the light wave transmissions of infrared spectra.
Have been found that the specific refractory power of regulating the core glass layer in by 1.4593 to 1.490 scope is useful.This feasible economy especially and the optical fiber, the particularly transmission wavelength about 1550nm of producing wide mode field band effectively.The core glass layer means the part that the footpath of substrate tube makes progress, in the scope that the specific refractory power of this part provides in the above.Specific refractory power can be identical on the whole thickness of core glass layer, but also any distribution can be arranged.
According to the present invention, also provide and produced the silica glass substrate tube that the optical fiber preform blank adopts, described pre-shaping blank has the core glass that is centered on by a sleeve glass, at least a portion of sleeve glass provides with the form of substrate tube, described substrate tube is having different hotchpotchs in the radial direction, it is characterized in that described substrate tube has an interior glass coating, the specific refractory power of described layer is at least 1.459.
About substrate tube, can realize on the basis of the substrate tube that begins to describe that purpose above-mentioned, this substrate tube comprise that specific refractory power is at least a core glass layer of 1.459.
This substrate tube comprises a core glass layer.The core glass layer is meant the radial component of the whole wall thickness of substrate tube, and its specific refractory power is at least 1.459.This specific refractory power is to measure under the wavelength of 589.3nm, and therefore than the specific refractory power height of plain silica glass, the latter is between 1.4585 and 1.4589 in the literature.Substrate tube can have one or more core glass layers.Except the core glass layer, at least one additional layer is set, its doping is different with the core glass layer.Therefore, when transversal its wall thickness is seen, substrate tube have different adulterated which floor.Not by for example the different pipe coupling of several doping being produced these layers together or by deposition glass coating on the surface of a quartz glass tube, but directly at porous SiO
2Produce these layers in the making processes of blank or in the processing that continues.As described above like that, by with SiO
2The blank vitrifying obtains this substrate tube, usually according to so-called ' cigarette ash process ', by means of the flame hydrolysis effect of silicon-containing compound and SiO
2Particle deposition produces SiO in a substrate
2Blank.In a sintering process of separating, realize porous SiO
2The vitrifying of blank, opposite with so-called direct vitrifying.
In the optical fiber that is obtained by the pre-shaping blank that adopts substrate tube to make, the core glass layer is used for the transmission of light, and this one deck usually is the part of the index distribution of complexity.Therefore, provide some zones of pre-shaping blank by substrate tube, otherwise, in known procedures, in the process of producing core glass, produce pre-shaping blank with very big cost.This makes the pre-shaping blank of the large volume of producing complicated index distribution effectively become easy.Can produce substrate tube itself by means of OVD process more economical and that productivity is higher.In this case, the core glass layer that substrate tube provided contributes to the transmission of light, and at this on the one hand, this core glass layer belongs to the core zone of optical fiber.Therefore, reduced the quantity that needs the additional wick glass of interpolation.
Can be used for producing the pre-shaping blank that is used for single-mode fiber according to substrate tube of the present invention, also be used for the pre-shaping blank of multimode optical fibers.Under any circumstance, all to introduce core glass in the substrate tube.This realizes according to MCVD or PCVD process usually, by means of silica glass is deposited upon on the inwall of substrate tube, and the coated substrate tube of medial surface is collapsed.Also be applicable to by pipe king-rod fabrication techniques pre-shaping blank according to substrate tube of the present invention.Chemistry or mechanical treatment may need, so that regulate desired surface quality and geometrical shape, for example by means of surface etch and polishing, perhaps by substrate tube being elongated desired last size.
At this on the one hand, it is also noted that the front is about producing the detailed explanation according to pre-shaping blank of the present invention.
Advantageously, the core glass layer is arranged to be connected on the core glass of pre-shaping blank.Here, a sizable part is provided by substrate tube in the zone of the transmission light of pre-shaping blank, and the core glass layer can form the part of adulterated equably central core glassy zone, perhaps forms the part that complex index of refraction distributes.In either case, the specific refractory power of core glass layer and the core glass that is connected with it can be identical or different.
Shown if substrate tube comprises that the glass-clad of being made by the silica glass of doped with fluorine is particularly useful.Such substrate tube is specially adapted to produce the single-mode fiber (so-called DC optical fiber) of compensation of dispersion.The index distribution of this optical fiber generally comprises a zone and the zone that specific refractory power is high that specific refractory power is low.Compare with known procedures, adopt according to process of the present invention and make such optical fiber especially effectively and simple, and can make two zones fully or available at least in part by substrate tube.
Advantageously, the core glass layer comprises germanium.Germanium improves the specific refractory power of silica glass, and it in silica glass with germanium oxide GeO
2Form exist.Because its transmission performance, germanium oxide is specially adapted to the light wave transmissions of infrared spectra.
Proved that specific refractory power is favourable in by 1.4593 to 1.490 scope.This substrate tube makes can be economical especially and produce the optical fiber that transmission wavelength about 1550nm has wide mode field band effectively.The core glass layer means the radial component of substrate tube, in the scope that the specific refractory power of this part provides, and no matter specific refractory power is identical, different distributions is arranged still in the above on the whole thickness of core glass layer.
1ppm is favourable if the content of the hydroxide ion of core glass layer is to the maximum by weight, particularly adopts the optical fiber of producing according to substrate tube of the present invention very little in the loss in infrared wavelength zone.Because hydroxide radical has absorption effect in the infrared wavelength zone, so the content of hydroxide radical OH hangs down in this wavelength region may of attention particularly important in the low optical fiber that loses.For example at the transmission wavelength about 1310nm or about 1550nm, the perhaps wavelength region between them, this is real, as employed in the optical data transmission technology.
The embodiment good especially according to a proof of substrate tube of the present invention is: coupling together with the core glass layer provides a diffusion impervious layer.This diffusion impervious layer makes to be made step-like index distribution and becomes easily, and it is, in comprising the environment of hotchpotch to porous SiO
2Blank carries out in the process of aftertreatment, undesirable diffusion that its stops the hotchpotch enter each several part to cross this diffusion impervious layer.Also several diffusion impervious layers can be arranged.By for example in deposition process, compressing SiO
2Some zone of blank is easy to form diffusion impervious layer.
Description of drawings
To explain the present invention in more detail by exemplary embodiment and accompanying drawing below.Particularly, these figure are schematically illustrated:
Fig. 1 a is first index distribution by the single-mode fiber of the pre-shaping blank acquisition of producing according to the present invention;
Fig. 1 b is according to substrate tube of the present invention, is used to produce the optical fiber that has according to the index distribution of Fig. 1 a;
Fig. 2 a is second index distribution by the single-mode fiber of the pre-shaping blank acquisition of producing according to the present invention;
Fig. 2 b is another embodiment according to substrate tube of the present invention, is used to produce the optical fiber that has according to the index distribution of Fig. 2 a;
Fig. 3 a is the third reflect rate distribution by the single-mode fiber of the pre-shaping blank acquisition of producing according to the present invention; And
Fig. 3 b is the another embodiment according to substrate tube of the present invention, is used to produce the optical fiber that has according to the index distribution of Fig. 3 a.
Embodiment
Below in the index distribution of on the basis of Fig. 1 a, 2a and 3a, describing in more detail, y axle is in each case represented refractive index contrast Δ=(n1-n2)/n2 (% represents with specific refractory power), and wherein n1 is meant the absolute refractive index in the light transmission zone of the correspondence of optical fiber.Reference point n2 is corresponding with the specific refractory power in the outer sleeve zone of each optical fiber, and its value always is 1.4589 under the 589.3nm wavelength in the exemplary embodiment of back.The radius of optical fiber is represented with micron on the x axle.
Specific refractory power according to Fig. 1 a is typical for being called as LEAF optical fiber (large effective area fiber).Such optical fiber has been described in patent document EP-A2775924.Compare with mobile dispersive optical fiber, its index distribution makes the mode field diameter of expansion, and therefore lower mean energy density is arranged in optical fiber.For reduce non-linear effect such as so-called from phase modulated (SPM), this wishes.And then the distribution of specific refractory power makes that the increase of chromatic dispersion is less.
Index distribution is divided into five core segment altogether.At diameter is the inner core section A of 4.5 microns (2.25 microns of radiuses), and refractive index contrast is Δ=0.6.The core segment B of adjacency with it outside, its bed thickness is 2.25 microns, refractive index contrast is Δ=0 (n1=n2 there).Then that core segment B is core segment C, and its thickness is 1.875 microns, and refractive index contrast is Δ=0.The refractive index contrast of core segment D is Δ=0.234, and its thickness is 1.125 microns.Core segment D and then sealed by core segment E, its refractive index contrast is Δ=0, its thickness is 1.18 microns.Then core segment E's is the outer optical region of the optical fiber made by plain silica glass.
By providing core segment C, D and E, and in substrate tube, produce core segment A and B by inside deposition according to substrate tube of the present invention.Border surface between core segment B and the C dots in Fig. 1 a.
In Fig. 1 b, schematically show the substrate tube of the optical fiber that is used to have such index distribution.The external diameter of substrate tube 1 is 25 millimeters, and total wall thickness is 3 millimeters.The internal layer 2 of substrate tube 1 is made by plain silica glass, and its specific refractory power is about 1.4589 at the 589.3nm wavelength.The thickness of internal layer 2 is 1.21 millimeters.With its adjacency be middle layer 3, this middle layer is to use GeO
2About by weight 3% is adulterated, and the specific refractory power that forms Δ above-mentioned=0.234 like this in core segment D increases.The layer thickness in middle layer 3 is 0.84 millimeter.The thickness of the skin 4 of substrate tube 1 is 0.95 millimeter, and it is again to be made by plain silica glass.As for the index distribution that relates to the optical fiber that obtains by use substrate tube 1, core segment C is corresponding with internal layer 2, and core segment D is corresponding with middle layer 3, and core segment E is corresponding with outer 4.
Produce substrate tube 1 according to the OVD process.According to known procedures, by means of SiCl
4The flame hydrolysis effect produce SiO
2Particle, and in the layer of these particle depositions on the axle of rotation.The deposition middle layer process in GeCl
4Add SiCl to
4In, thereby the middle layer 3 of acquisition doped with Ge.Obtain porous SiO
2/ GeO
2The cigarette ash body.Reach the level below the 30ppb by weight for hydroxide radical group is removed, the cigarette ash body of producing like this will stand chlorine treatment at elevated temperatures.Forming under the cylindrical situation of hollow porous SiO then
2The cigarette ash bulk glassization.Make the surface smoothing of hollow circular cylinder with the method for machinery, use the chemical process etching subsequently.Again the final length that elongates substrate tube in this way through pretreated hollow circular cylinder.
In order to produce the pre-shaping blank of the optical fiber that is used for having the index distribution of representing at Fig. 1, at first by means of the plain SiO of MCVD process
2Layer directly carries out vitrifying simultaneously arriving about 1.01 millimeters thickness as inwall 5 coatings at the substrate tube 1 as shown in Fig. 1 b.Produce the layer that thickness is 0.37 millimeter doped with Ge subsequently, in this process, GeCl
4Add in the material of beginning, its mode makes to have by weight by the silica glass produce the concentration of germanium is approximately 9%.Formed specific refractory power is about 9 * 10
-3, this is with corresponding at the core segment A shown in Fig. 1 a.
The substrate tube of inner coating is collapsed.The external diameter of the core bar of producing like this is 19 millimeters.Use the outer tube (sleeve) of plain silica glass that it is covered subsequently.The external diameter of the pre-shaping blank of producing like this is approximately 137 millimeters.The pre-shaping blank of Sheng Chaning has about 137 millimeters external diameter like this.The optical fiber that such blank is pulled out has 125 microns external diameter, and the index distribution in its core zone as illustrated in Figure 1.
Show a kind of remodeling according to the index distribution of Fig. 2 a in the optical fiber designs shown in Fig. 1 a.This index distribution has also caused the increase of mode field diameter, and therefore makes that the average luminous intensity in optical fiber is lower.Such optical fiber has also been described in patent document EP-A2775924.
Index distribution according to Fig. 2 a has four core segment altogether.At diameter is the core segment A of 7 microns (3.5 microns of radiuses), the refractive index contrast Δ by maximum value 0.9 (with surpass n2 about 13 * 10
-3Corresponding, n2=1.4589 wherein) reduce linearly to 0 (zero).At next core segment B, its bed thickness is 2.5 microns, and refractive index contrast is Δ=0 (the absolute refractive index there=n2).The thickness of the 3rd core segment C is 1 micron, and refractive index contrast is set to 0.1485 in this core segment.In the 4th core segment D that the next one is followed outside, refractive index contrast is 0 again, and the thickness of layer is 4.08 microns.
By providing core segment C/D according to substrate tube of the present invention.In this substrate tube, produce core segment A and B by inside deposition.Outside and the border surface between the inside in core segment dot in Fig. 2 a.
In Fig. 2 b, schematically show the substrate tube that is used for producing according to the optical fiber of the index distribution of Fig. 2 a.The external diameter of substrate tube 21 is 25 millimeters, and total wall thickness is 3 millimeters.The internal layer 22 of substrate tube 21 is made by the silica glass of doped with Ge.The thickness of internal layer 22 is 0.45 millimeter, and the concentration of germanium is approximately 2% by weight, and the specific refractory power that forms in core segment C shown in Fig. 2 a increases like this.The thickness of the skin 23 of substrate tube 21 is 2.55 millimeters, is again to be made of plain silica glass.Under the index distribution situation of the optical fiber that obtains by employing substrate tube 21, core segment C is formed by internal layer 22, and core segment D forms by outer 23.
Produce substrate tube 21 according to the OVD process.According to known procedures, by means of SiCl
4The flame hydrolysis effect produce SiO
2Particle, and in the layer of these particle depositions on the axle of rotation.The deposition internal layer 22 process in GeCl
4Add SiCl to
4In, thereby the internal layer 22 of acquisition doped with Ge.After depositing the cigarette ash material layer of doped with Ge, the thickness of this layer is corresponding with internal layer 22, stop supplies GeCl
4, and continue to form plain material.Like this, obtain porous SiO
2Body.After removing this carrier, for being removed, hydroxide radical group reaches the level below the 30ppb by weight, and the cigarette ash body of producing like this will stand chlorine treatment at elevated temperatures.SiO then dewaters porous
2The cigarette ash body is in the situation lower-glassization that forms substrate tube 21.Make the internal surface and the outer surface smoother of substrate tube 21 subsequently with mechanical means, and use the chemical process etching.
In order to produce the pre-shaping blank of the optical fiber that is used for having the index distribution of representing at Fig. 2 a, at first by means of the plain SiO of MCVD process
2Layer directly carries out vitrifying simultaneously arriving about 0.88 millimeter thickness as inwall 24 coatings at the substrate tube 21 as shown in Fig. 2 b.Produce the layer that thickness is 0.48 millimeter doped with Ge subsequently, in this process, GeCl
4Add in the material of beginning.GeO in the layer of doped with Ge
2Corresponding concentration gradient be created in refractive index curve among the core segment A (Fig. 2 a).
The substrate tube 21 of coating is collapsed.The external diameter of the core bar of producing like this is 19 millimeters.Outer tube with plain silica glass covers it subsequently.The external diameter of the pre-shaping blank of producing like this is approximately 103 millimeters.The optical fiber of being pulled out by such blank has 125 microns external diameter, and the index distribution in its core zone is as shown in Fig. 2 a.
Is typical in the index distribution shown in Fig. 3 a for being called as DC optical fiber.Such optical fiber has been described in patent document EP-A2598554.The outstanding feature of this DC optical fiber is that strong negative dispersion is arranged under the transmission wavelength of 1550nm.Using it is that this positive dispersion is believed to be about 17ps/ (nmkm) in the literature for the positive dispersion at 1550nm of the single-mode fiber of compensation standard.Like this, even under the transmission wavelength of 1550nm, use the single-mode fiber of standard also can obtain high transfer rate.
Index distribution is divided into four core segment altogether.Be approximately the core segment A of 3.8 microns (1.9 microns of radiuses) at diameter, the refractive index contrast Δ is reduced according to the para-curve mode by the maximum value to 0 of Δ=1.9.The core segment B that on outside direction, then is provided with, its bed thickness is 3.8 microns, refractive index contrast is Δ=-0.4.Then that core segment B is core segment C, and its thickness is 1.9 microns, and refractive index contrast is Δ=0.4.The refractive index contrast Δ of core segment D is 0 again, and the layer thickness of this section is 1.49 microns.Then core segment D's is the outer optics cladding regions of the optical fiber that is made of plain silica glass.
By providing core segment B, C and D according to substrate tube of the present invention.Borderline region between core segment A and the B dots in Fig. 3 a.
In Fig. 3 b, schematically show the substrate tube that is used for producing according to the optical fiber of the index distribution of Fig. 3 a.To be more detailed description below to substrate tube and its production method.
The external diameter of substrate tube 31 is 25 millimeters, and total wall thickness is 3 millimeters.The internal layer 32 of substrate tube 31 is made by the silica glass of doped with fluorine, the specific refractory power of the pure silica glass of its refractive index ratio low 5.8 * 10
-3The concentration of fluorine is approximately 2% by weight in core segment B, and bed thickness is 1.19 millimeters.Then its is middle layer 33, and this middle layer is to use GeO
2About by weight 10% is adulterated, and also 2% mix by weight with fluorine, the increase of the common specific refractory power of formation above-mentioned 0.4% in core segment C like this.The thickness in middle layer 33 is 0.95 millimeter.The thickness of the skin 34 of substrate tube 31 is 0.86 millimeter, and it also is to be made by the silica glass of the mixture of doped with fluorine and germanium, and the concentration of fluorine is 2% by weight, and GeO
2Concentration be 5% by weight.GeO
2The effect that makes effect that specific refractory power raises and fluorine that specific refractory power is reduced under the concentration that these provide above hotchpotch, cause and change into 0 with respect to the specific refractory power of plain silica glass.Under the situation of the index distribution by using the optical fiber that substrate tube 31 obtains, core segment B is corresponding with internal layer 32, and core segment C is corresponding with middle layer 33, and core segment D is corresponding with skin 34.
Subsequently porous SiO
2The cigarette ash body is heated to about 800 degrees centigrade in fluorine-containing environment, and transversal its whole wall thickness mixes equably with fluorine.Reduce the content of hydroxide radical group simultaneously.
Then with porous SiO
2The cigarette ash body is in the cylindrical situation lower-glassization that forms hollow.Make the surface smoothing of hollow circular cylinder with the method for machinery, use the chemical process etching subsequently.The final size that such hollow circular cylinder of handling is elongated substrate tube subsequently.
To describe in more detail below and be used to produce according to second embodiment of the substrate tube of the optical fiber of the index distribution of Fig. 3 a and its production process.
The external diameter of substrate tube is 25 millimeters, and total wall thickness is 3 millimeters.The internal layer of substrate tube is made by the silica glass of doped with fluorine, the specific refractory power of the pure silica glass of its refractive index ratio low 5.8 * 10
-3The concentration of fluorine is approximately 1% by weight in core segment B.Bed thickness is 1.19 millimeters.Follow its middle layer GeO
2About by weight 5.4% mixes, and forms the increase according to the common specific refractory power of Δ=0.4 shown in Fig. 3 a like this in core segment C.The thickness in middle layer is 0.95 millimeter.The outer field thickness of substrate tube is 0.86 millimeter, and it is made by plain silica glass.Under the situation of the index distribution by using the optical fiber that this substrate tube obtains, core segment B is corresponding with internal layer, and core segment C is corresponding with the middle layer, and core segment D is with outer corresponding.
Production process according to this embodiment of substrate tube of the present invention will be described below.Produce this substrate tube according to the OVD process.For this reason, according to known procedures by means of SiCl
4The flame hydrolysis effect produce SiO
2Particle, and adopt deposition burner in the layer of these particle depositions on the axle of rotation.The surface temperature of the cigarette ash body that is forming in deposition process is approximately 1400 degrees centigrade.In order to produce internal layer, use SiCl
4, and the deposition middle layer process in GeCl
4Be added among it.In producing outer field process, stop GeCl again
4Supply.The porous SiO that obtains like this
2The cigarette ash body has the middle layer of doped germanium.The outstanding feature of this process is: be right after before the deposition in middle layer and produce a thickness and be approximately a diffusion impervious layer of 0.5 millimeter.SiO in this diffusion impervious layer
2The cigarette ash body has higher density.Obtain such result and be because in the process of the soot layer of formation of deposits diffusion impervious layer, the SiO that is forming
2The cigarette ash body has been kept higher surface temperature.For this reason, suitably increase gas supply to deposition burner.
In order to produce the layer of inner doped with fluorine, porous SiO
2The cigarette ash body heats, and sends into fluorine-containing gas by internal openings.Diffusion impervious layer stops fluorine-containing gaseous diffusion to enter the middle layer of doped germanium.Like this, have only internal layer to mix, and middle layer or skin need not mix with fluorine.To in internal layer, the concentration of OH be reduced to the level that is lower than 50ppb simultaneously by fluorine-containing gas processing.
Then with porous SiO
2The cigarette ash body is forming the situation lower-glassization of substrate tube.Make the surface smoothing of substrate tube with mechanical means, use the chemical process etching subsequently.
In order to produce the pre-shaping blank that is used to have at the optical fiber of the index distribution shown in Fig. 3 a, produce formation core segment A (Fig. 3 core glass a) by the deposition of the inside MCVD in substrate tube.This will describe by means of Fig. 3 b below in more detail.
By means of the MCVD process doped with Ge O
2SiO
2Be deposited upon on the internal surface 35 according to the substrate tube 31 of Fig. 3 b, and directly carry out vitrifying.In deposition process, increase GeCl constantly
4Interpolation, make and to set up a kind of GeO
2Concentration distribution, this distributes with corresponding in the parabolic distribution of the specific refractory power in core A shown in Fig. 3 a.The thickness of the layer of the doped with Ge of Chan Shenging is 0.16 millimeter like this.Germanium concentration in the layer is to the maximum about by weight 30%, will form about 30 * 10 like this
-3Specific refractory power increase, as shown in Fig. 3 a.
The substrate tube of such generation is collapsed.The external diameter of the core bar of producing like this is 16.6 millimeters.With the outer tube of plain silica glass it is sealed subsequently.The external diameter of the pre-shaping blank of producing like this is approximately 114 millimeters.The optical fiber of being pulled out by such blank has 125 microns external diameter, and its index distribution is as shown in Fig. 3 a.
Claims (27)
1. a production is used for the process of the pre-shaping blank of optical data communication technology, this process is by a kind of silica glass substrate tube is provided, described substrate tube has different hotchpotchs in the zone of radial direction, introduce the core that synthetic quartz glass is made, and the substrate pipe box is got up with a telescopic pipe, it is characterized in that piped porous SiO
2Blank is provided has first radial component that contains first hotchpotch that increases the silica glass specific refractory power, the described piped porous of vitrifying SiO
2Blank is to be formed on the substrate tube that has different hotchpotchs in radial direction, and the radial component of winning is formed in the interior glass coating of described substrate tube, glass coating contains described first hotchpotch in described, in substrate tube, introduce the synthetic quartz glass core and described substrate tube collapsed forming the substrate tube that collapses that contains core, then with sleeve around the described substrate tube that collapses place and the described sleeve that collapses to form the optical fiber preform blank.
2. according to the described process of claim 1, it is characterized in that, on a carrier, pass through the flame hydrolysis effect and the SiO of silicon compound
2The described porous SiO of particulate formation of deposits
2Blank wherein, adds first hotchpotch in sedimentary process.
3. according to the described process of claim 1, it is characterized in that, core glass is introduced in the substrate tube by inside deposition.
4. according to the described process of one of claim 1 to 3, it is characterized in that after deposition and before vitrifying, second hotchpotch of using the specific refractory power that changes silica glass is to porous SiO
2At least the second radial zone of blank mixes.
5. according to the described process of claim 4, it is characterized in that, for second radial zone is mixed, with SiO
2Blank heating, and simultaneously described SiO
2Blank is exposed in the environment that comprises second hotchpotch.
6. according to the described process of claim 4, it is characterized in that fluorine is used as described second hotchpotch.
7. according to the described process of one of claim 1 to 3, it is characterized in that the germanic compound of a kind of bag is used as described first hotchpotch.
8. according to the described process of one of claim 1 to 3, it is characterized in that interior glass coating is adjusted to specific refractory power in by 1.459 to 1.490 scope.
9. according to the described process of claim 1, it is characterized in that,
Described piped porous SiO
2Blank has second radial component adjacent with described first radial component, thereby described second radial component or do not have described first kind of hotchpotch perhaps comprises the described first kind hotchpotch different with the described first radial component content; With
With described blank vitrifying, to form the silica glass substrate tube, make described substrate tube that an interior glass coating and outer glass coating be arranged, described interior glass coating comprises described first kind of hotchpotch, described outer glass coating does not have described first kind of hotchpotch, perhaps comprises described first kind of hotchpotch of different concns.
10. according to the described process of claim 9, it is characterized in that, on a carrier, pass through the flame hydrolysis effect and the SiO of silicon compound
2The described porous SiO of particulate formation of deposits
2Blank wherein, adds first hotchpotch in the process of particle deposition.
11., it is characterized in that described internal layer is formed on the surface in facing diametrically in the described substrate tube according to the described process of claim 9.
12., it is characterized in that it also comprises according to the described process of claim 9
Before carrying out vitrifying, comprising under the temperature that is being up to 1300 degrees centigrade in the environment of chlorine or fluorine and making SiO
2The blank dehydration.
13., it is characterized in that it also comprises according to the described process of claim 9
By inside deposition interior glass coating is introduced in the described substrate tube.
14., it is characterized in that after deposition and before vitrifying, second kind of hotchpotch using the specific refractory power that changes silica glass is to porous SiO according to the described process of claim 9
2The skin of blank mixes.
15. according to the described process of claim 14, it is characterized in that, by heating SiO simultaneously
2Blank is also SiO
2Blank is exposed in the environment that comprises second kind of hotchpotch, and described skin is mixed.
16., it is characterized in that described second kind of hotchpotch is fluorine according to the described process of claim 14.
17., it is characterized in that described second kind of hotchpotch is fluorine according to the described process of claim 15.
18., it is characterized in that described first kind of hotchpotch comprises germanium according to the described process of claim 9.
19., it is characterized in that the specific refractory power of described interior glass coating is in by 1.4593 to 1.490 scope according to the described process of claim 9.
20. produce the silica glass substrate tube that the optical fiber preform blank adopts in the claim 1, described pre-shaping blank has the core glass that is centered on by a sleeve glass, at least a portion of sleeve glass provides with the form of substrate tube, described substrate tube is having different hotchpotchs in the radial direction, it is characterized in that, described substrate tube has an interior glass coating, and the specific refractory power of described layer is at least 1.459.
21., it is characterized in that described interior glass coating is arranged to the core glass in abutting connection with pre-shaping blank according to the described substrate tube of claim 20.
22., it is characterized in that described substrate tube comprises a covering of being made by the silica glass of doped with fluorine according to the described substrate tube of claim 20.
23. require each described substrate tube in 20 to 22, it is characterized in that described interior glass coating comprises germanium according to aforesaid right.
24. require each described substrate tube in 20 to 22, it is characterized in that described interior glass coating also comprises fluorine according to aforesaid right.
25. require each described substrate tube in 20 to 22, it is characterized in that the specific refractory power of described interior glass coating is in by 1.4593 to 1.490 scope according to aforesaid right.
26. require each described substrate tube in 20 to 22 according to aforesaid right, it is characterized in that the content of hydroxide ion is 1ppm by weight to the maximum in the glass coating in described.
27. require each described substrate tube in 20 to 22, it is characterized in that contiguous described interior glass coating is provided with diffusion impervious layer according to aforesaid right.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2000/002651 WO2001072648A1 (en) | 2000-03-25 | 2000-03-25 | Substrate tube and process for producing a preform for an optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1454187A CN1454187A (en) | 2003-11-05 |
| CN1293008C true CN1293008C (en) | 2007-01-03 |
Family
ID=8163886
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008195862A Expired - Fee Related CN1293008C (en) | 2000-03-25 | 2000-03-25 | Substrate tube and process for producing a preform for an optical fiber |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2003531796A (en) |
| CN (1) | CN1293008C (en) |
| WO (1) | WO2001072648A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI789754B (en) * | 2021-05-11 | 2023-01-11 | 卓越光纖股份有限公司 | Apparatus for optical fiber manufacturing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7836728B2 (en) * | 2007-05-09 | 2010-11-23 | Ofs Fitel, Llc | Increasing the cladding-to-core ratio (D/d) of low D/d ratio core rods in optical fiber performs |
| DE102011118268A1 (en) | 2011-05-27 | 2012-11-29 | J-Plasma Gmbh | Process for producing a semifinished product for producing a bending-optimized optical fiber |
| CN103513327B (en) * | 2013-09-11 | 2016-01-27 | 江苏南方通信科技有限公司 | A kind of method for making of bend-insensitive multimode optical fiber |
| US9658395B2 (en) * | 2014-10-21 | 2017-05-23 | Ofs Fitel, Llc | Low loss optical fiber and method of making the same |
| CN106680931A (en) * | 2017-03-16 | 2017-05-17 | 江苏亨通光导新材料有限公司 | Low-loss optical fiber and production method thereof |
| WO2021111337A1 (en) * | 2019-12-04 | 2021-06-10 | Alcon Inc. | Multi-core optical fiber with reduced bubble formation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0249230A1 (en) * | 1986-06-11 | 1987-12-16 | Sumitomo Electric Industries Limited | Glass preform for dispersion shifted single mode optical fiber and method for the production of the same |
| EP0434237A2 (en) * | 1989-12-22 | 1991-06-26 | AT&T Corp. | Method of producing optical fiber, and fiber produced by the method |
| EP0762159A2 (en) * | 1995-08-31 | 1997-03-12 | Sumitomo Electric Industries, Ltd. | Dispersion-compensating fiber and method of fabricating the same |
| EP0785448A1 (en) * | 1996-01-16 | 1997-07-23 | Sumitomo Electric Industries, Ltd. | Dispersion-shifted fiber |
| WO1999040037A1 (en) * | 1998-02-03 | 1999-08-12 | Sumitomo Electric Industries, Ltd. | Method of manufacturing optical fiber base material |
| CN1243811A (en) * | 1997-10-29 | 2000-02-09 | 康宁股份有限公司 | Manufacture of pre-fabricated bars for layered fiber core optical guide |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0798671B2 (en) * | 1987-03-09 | 1995-10-25 | 住友電気工業株式会社 | Method for manufacturing preform for optical fiber |
| JPH01160840A (en) * | 1987-12-16 | 1989-06-23 | Sumitomo Electric Ind Ltd | Preform for dispersion-shift optical fiber and production thereof |
| DE19852704A1 (en) * | 1998-11-16 | 2000-05-18 | Heraeus Quarzglas | Method for producing a preform for an optical fiber and substrate tube suitable for carrying out the method |
-
2000
- 2000-03-25 WO PCT/EP2000/002651 patent/WO2001072648A1/en active IP Right Grant
- 2000-03-25 JP JP2001570568A patent/JP2003531796A/en not_active Ceased
- 2000-03-25 CN CNB008195862A patent/CN1293008C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0249230A1 (en) * | 1986-06-11 | 1987-12-16 | Sumitomo Electric Industries Limited | Glass preform for dispersion shifted single mode optical fiber and method for the production of the same |
| EP0434237A2 (en) * | 1989-12-22 | 1991-06-26 | AT&T Corp. | Method of producing optical fiber, and fiber produced by the method |
| EP0762159A2 (en) * | 1995-08-31 | 1997-03-12 | Sumitomo Electric Industries, Ltd. | Dispersion-compensating fiber and method of fabricating the same |
| EP0785448A1 (en) * | 1996-01-16 | 1997-07-23 | Sumitomo Electric Industries, Ltd. | Dispersion-shifted fiber |
| CN1243811A (en) * | 1997-10-29 | 2000-02-09 | 康宁股份有限公司 | Manufacture of pre-fabricated bars for layered fiber core optical guide |
| WO1999040037A1 (en) * | 1998-02-03 | 1999-08-12 | Sumitomo Electric Industries, Ltd. | Method of manufacturing optical fiber base material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI789754B (en) * | 2021-05-11 | 2023-01-11 | 卓越光纖股份有限公司 | Apparatus for optical fiber manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1454187A (en) | 2003-11-05 |
| WO2001072648A1 (en) | 2001-10-04 |
| JP2003531796A (en) | 2003-10-28 |
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