CN1041129C - Optic fibre in circular polarization state and is mfg. method - Google Patents
Optic fibre in circular polarization state and is mfg. method Download PDFInfo
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- CN1041129C CN1041129C CN92113821A CN92113821A CN1041129C CN 1041129 C CN1041129 C CN 1041129C CN 92113821 A CN92113821 A CN 92113821A CN 92113821 A CN92113821 A CN 92113821A CN 1041129 C CN1041129 C CN 1041129C
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- 239000000835 fiber Substances 0.000 title claims abstract description 61
- 230000010287 polarization Effects 0.000 title claims description 42
- 238000000034 method Methods 0.000 title claims description 33
- 239000013307 optical fiber Substances 0.000 claims abstract description 74
- 238000005516 engineering process Methods 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005229 chemical vapour deposition Methods 0.000 claims description 2
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052810 boron oxide Inorganic materials 0.000 claims 1
- 239000007787 solid Substances 0.000 description 9
- 238000005491 wire drawing Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 208000025174 PANDAS Diseases 0.000 description 4
- 208000021155 Paediatric autoimmune neuropsychiatric disorders associated with streptococcal infection Diseases 0.000 description 4
- 240000004718 Panda Species 0.000 description 4
- 235000016496 Panda oleosa Nutrition 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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Classifications
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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
-
- 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
- C03B2201/10—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron
-
- 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
-
- 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
- C03B2203/18—Axial perturbations, e.g. in refractive index or composition
- C03B2203/20—Axial perturbations, e.g. in refractive index or composition helical
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/32—Eccentric core or cladding
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/34—Plural core other than bundles, e.g. double core
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The present invention relates to a continuous patent application of the previous patent application 92108598.2, and the conception and the theory of the continuous patent application is based on the contents disclosed in the previous application, namely that circular birefringence can be generated because the inner part of a drawn optical fiber comprises a spiral stress action body which rotates round the fiber axis. The patent application further complements and discloses that the number of the spiral stress body is not limited in one, namely that the number can be two or more under the condition that no inherent line birefringence is introduced.
Description
The present invention relates to a kind of special fiber and its production and application, especially relate to and a kind ofly can keep optical fiber of circular polarization state and its production and application.
In the research and development of optical fiber, because the circularly polarized light transmission has the many advantages that are better than the linearly polarized light transmission, the very big convenience aspect the optical fiber connection particularly, French optical fiber expert Mr. L.JeunhommeandM.Monerie was just arranged at periodical Electron.Lett.vol.16 as far back as 1980, No.24, PP.921-922 (1980) delivers is entitled as the imagination that proposed to replace with circularly polarized light linearly polarized light in " Polarization-maintainingsingle-modefibrecabledesign " article in fibre-optic transmission system (FOTS).So being summed up as, the key of problem can find a kind of special optical fiber that keeps the circular polarization state ability that has.Conventional fiber should both can pass linearly polarized light under ideal conditions, also can pass circularly polarized light equally.But have actually under the condition of inevitable various disturbances, conventional fiber passes linearly polarized light or passes circularly polarized light all unstable.So from late nineteen seventies about till now 15 days, the optical fiber expert paid the special structure that very big effort seeks to stablize optical fiber polarisation attitude (no matter linear polarization or circular polarization state).
In the effort of seeking retention wire polarization state optical fiber, obtained very real accomplishment, " tie fiber " of Britain particularly wherein, " panda optic fibre " and " Furukawa optical fiber " of Japan, " the healthy and free from worry optical fiber " of the U.S. and Bel's " elliptical fiber partially ", or the like.It's a pity, keep in the effort of circular polarization state optical fiber seeking, from the late nineteen seventies early eighties till now, but is not obtain substantial progress.The original a kind of method as far back as the late nineteen seventies early eighties is just known is with the capable firmly turn-knob of optical fiber under " cold " state, it's a pity, this method that optical fiber is turned round firmly, though under perturbation situation a little less than the short fiber, can produce the function of certain maintenance circular polarization state, but the ability of its maintenance circular polarization state is very weak and the ability of the retention wire polarization state of existing so-called " polarization maintaining optical fibre " compares, and differs greatly.Because the restriction of the intensity of optical fiber glass material, twisting head round firmly to make the optical fiber brisement.Because this is intrinsic, except the minority particular case, turns round optical fiber firmly and fail to be seen in practicality, although the effort that has first-class in the world company of several families once to pay several years at early eighties is attempted with turning round the Optical Fiber Transmission circularly polarized light firmly.Except that the restriction of above-mentioned intensity, turn round a subsidiary practical problems of optical fiber firmly, be how will turn round state after turning round firmly firmly to be preserved and fix.
The purpose of this invention is to provide and a kind ofly can keep special optical fiber of circular polarization state and preparation method thereof, this kind optical fiber can utilize ready-made optical fiber fabrication technology equipment, starting material and technology, add method of the present invention and make, do not exist fully turn round firmly optical fiber intrinsic difficult problem.Further purpose of the present invention provides the various application that can keep the special optical fiber of circular polarization state to above-mentioned.
A kind of optical fiber that can keep circular polarization state involved in the present invention is characterized in that, forms one or one or more spirality stress acting body around fine axle rotation at the inside of optical fibre that has pulled into, in order to produce circular birefringence.
A kind of method for preparing the optical fiber (being called for short " protecting circle " optical fiber) that can keep circular polarization state involved in the present invention, it is characterized in that, used prefabricated rods contains the stress cylinder of one or one above off-center axis, in the drawing optical fibers process, rotate this prefabricated rods, be about to the stress cylinder and pull into a helix, thereby make required high circular birefringence special optical fiber (promptly protecting circular fiber).
Fig. 1 represents to protect structure (amplification) synoptic diagram of circular fiber.
Fig. 2 represents to protect the structural representation of circular fiber prefabricated rods.
Fig. 3 represents to utilize the full optical fibre top system of protecting circular fiber and protecting circle component devices formation.
Fig. 4 (a) expression contains the cross sectional representation of the prefabricated rods of two stress acting bodies, this two stress solid and fibre core line mutually orthogonal; Fig. 4 (b) shows the cross sectional representation of the prefabricated rods that contains four stress acting bodies.
Detailed description of the present invention provides with reference to accompanying drawing in preceding paragraph patented claim 92108598.2.Among Fig. 1, numeric character 1 expression optical fiber cross section, 2 expression fibre cores, 3 expression stress acting bodies, 4 expression whole pieces are protected circular fiber.Under the sufficiently high situation of prefabricated rods angular velocity of rotation, the transmission mode in the optical fiber that is pulled into levels off to circular polarisation mode.Not high enough as the prefabricated rods angular velocity of rotation, then be the elliptic polarization pattern.The bat length of circular polarisation mode depends on the wire drawing linear velocity of angular velocity of rotation and optical fiber, promptly depends on and revolves distance.Simultaneously, this claps long geometric relationship and refractive index and the stress distribution relation that also depends on cross section of optic fibre.
Can make the various fiber optic components and the device that can keep circular polarization state with optical fiber of the present invention.As an example, the directional coupler C of the circle of the maintenance in the gyrosystem shown in Figure 3 skewness can utilize optical fiber of the present invention to make.From the angle of technology, protect the circular fiber component devices and make manyly easily than existing what is called " polarization maintaining optical fibre " (be the retention wire polarization state, or " guarantor's line ") fiber optic component device.This is because for protecting the circular fiber component devices, do not require spindle alignment.And protect the fine component devices of linear light, the fine inner main axis of then spindle alignment, particularly multifiber processing part is aimed at, and probably is the biggest problem of making this kind component devices.
The present invention's " guarantor's circle " optical fiber is applicable to and requires stable fiber optic network of polarization state and system, its unique advantage to make the interconnection of each fiber optic component device in the network system greatly obtain simplifying.This distinct advantages, the problem that only on technology, saves time and save trouble not, and help the stable and correct work of fibre system.By having the network system that so-called polarization maintaining optical fibre (being the optical fiber of retention wire polarization state) is constituted now, if, often also can influence the normal operation of optical fiber network system even a certain contact both sides polarization maintaining optical fibre main shaft has staggered the several years a little.As protecting one of circular fiber system example, Fig. 3 shows the full optical fibre top structure that usefulness " guarantor's circle " optical fiber and component devices constitute.
S represents super-radiance light emitting diode light source (SLD) among the figure; PPC.Expression Passibe glassfibre polarization mode control change device; C represents to protect round directional coupler; D represents detecting device; L represents matched load; Gyro represents the gyro ring; Ω represents the angle rotating speed of gyro ring.
This full optical fibre top structure is used a passive polarization state control change device PPC.The linearly polarized light of light source S emission is transformed to circularly polarized light.This discloses in the inventor's Chinese patent application 92108559.1.In addition, the whole optical path shown in Fig. 3 comprises the gyro ring, works in circular polarization state all.With " guarantor's line " optical fiber (being common so-called polarization maintaining optical fibre) coiling gyro ring, unless the sort of flat polarization maintaining optical fibre with the Bell Laboratory initiative, be difficult to accomplish marshalling unanimity everywhere around gyro around its orientations of major of the optical fiber on the tube, and owing to protect linear polarization optical fiber main shaft in the random arrangement that forms in letter, the Sagnac effect that is produced when the gyro ring is rotated weakens to some extent.With protecting circular fiber coiling gyro ring, then there is not this shortcoming.How little as for making with its diameter of gyro ring of protecting the circular fiber coiled, then to see structural design, condition such as used dopant material and technology and deciding promptly can reach by optical fiber circular birefringence how level is decided.Retention wire polarization state optical fiber has been studied about 15 years, protecting circular fiber then just invents, therefore, in now, two kinds of distinct optical fiber (protect the linear light fibre, protect circular fiber) are used for this concrete technical skill of coiling gyro ring, make more comprehensive relative merits and weigh the pros and cons, for the time a little earlier.In the invention described above people's Chinese patent application (92108559.7), the autostable full optical fibre top of passive polarization state that is disclosed in now, is a kind of compromise property scheme that adopts circular polarization state and linear polarization to mix.Except that optical fibre gyro, protect circular fiber and be used for the optical fiber network system that various interferometer type Fibre Optical Sensors and other requirement have stable polarized attitude, also can bring into play its unique advantages.
Protect the problem whether circular fiber is applicable to the long-distance optical fiber transmission about the present invention, to depend primarily on the cost of making this kind optical fiber and how to drop to degree at last, also be decided by to protect circular fiber and the relative merits of existing various optical fiber aspect transport property certainly relatively and balance.As for being applied to fiber optic component device and the fibre system that requires stable polarized attitude, then guarantor's circular fiber of the present invention has special attractive force undoubtedly, perhaps can in many fiber optic applications fields, cause the technological change that has fundamental character, promptly in many optical fiber network systems, replace linearly polarized light, that is in many systems, replace existing polarization maintaining optical fibre to protect circular fiber with circularly polarized light.
Make guarantor's circular fiber of the present invention, can utilize ready-made conventional equipment and common process, add the inventive method, realize than being easier to operation.In the process of routine, important outer be " Modified Chemical Vapor Deposition " (MCVD) method and " the stress post is imbedded prefabricated rods " method or with similar " the extra heavy pipe cover buttress shaft " method of the latter.
Crucial technology is to make prefabricated rods, its structure as shown in Figure 2,1 expression optical fiber cross section wherein; 2 expression fibre cores; 3 expression cylindricality stress acting bodies; Prefabricated rods has been arranged, and then wire drawing is out of question.With MCVD manufactured guarantor's circular fiber prefabricated rods with this manufactured tie fiber prefabricated rods, basic identical on process.Make the tie fiber prefabricated rods and mainly contain four procedures conventional operations such as (not very) deposition cushions, promptly deposit boron oxide (B
2O
3), deposit germanium oxide (G for the second time to burning burn into
eO
2) and receive rod.Deposition B
2O
3In the operation, being contained in prefabricated rods pipe on the glass work lathe is that axis rotates with the tubular axis, manage outer both sides two duration and degree of heatings of burning length direction along pipe is moved back and forth.In the corrosion process, the prefabricated rods pipe stops operating and remains static, and passes to corrosive gas (as fluorine) in the pipe, and two duration and degree of heatings are along static rod pipe still operation back and forth.Make the present invention and protect the used prefabricated rods of circular fiber, its operation is same as described above, only needs to be improved on the second road corrosion process.Reason is, the present invention requires only to contain in the prefabricated rods stress acting body, so after the corrosion process of above-mentioned tie fiber, need one among two duration and degree of heatings is extinguished, and a last duration and degree of heating turned over 90 ° (they generally are that duration and degree of heating is motionless, the prefabricated rods pipe is turned over 90 ° on glass work lathe) with respect to the orientation of prefabricated rods pipe, continue then to corrode again that (pipe does not rotate, the Guan Zhongtong fluorine, single duration and degree of heating moves back and forth along the pipe range direction).After this operation is finished, the same with the back two procedures of making tie fiber, then carry out (GeO for the second time
2) deposition and last receipts rod.The point that made this kind of prefabricated rods is different from the tie fiber prefabricated rods only is that it only contains knot half, or only contains the stress acting body of an off-axis.After prefabricated rods was made, remaining wire-drawing technology was then fairly simple.Adorn a motor in conventional wire-drawer-tower upper end, in drawing process, prefabricated rods rotated.The rotating speed of motor is constant, and technical requirement is not harsh.
Connect the guarantor's circular fiber that is become after circular birefringence prefabricated rods that above-mentioned MCVD method makes and the wire drawing, its stress solid cross section is fan-shaped, or is bordering on fan-shapedly, decides on process conditions.Guarantor's circular fiber shown in Figure 1 and prefabricated rods shown in Figure 2, wherein the cross section of stress solid all simply is depicted as circle.Self-evident, Fig. 1 and Fig. 2 are the principle synoptic diagram, generally are applicable to various situations, no matter the stress solid cross section is circular, or non-circular (for example described herein is fan-shaped).
Protect the used prefabricated rods of circular fiber with " the stress post is imbedded prefabricated rods " method or " extra heavy pipe cover buttress shaft " manufactured the present invention, basic identical with all process steps of making panda or the used prefabricated rods of similar panda optic fibre, its difference is only need imbed (or a being inserted in) stress cylinder (being generally round section) in the prefabricated rods (or prefabricated pipe).The dissimilarity of the method for wire drawing and panda optic fibre wire drawing is wire drawing limit, limit rotation prefabricated rods.
From not only simply and but also practical angle, in the present patent application instructions, set forth the guarantor's circular fiber and the manufacture method thereof that contain a spirality stress solid of being invented, relevant structural representation is illustrated in Fig. 1,2.But know that based on design reasoning of the present invention guarantor's circular fiber of the present invention also can contain many spirality stress solids, condition is the not inlead birefringence of the geometric arrangement of these many spirality stress solids.Fig. 4 (a), (b) expression contains the prefabricated rods diagrammatic cross-sectional view of optical fiber of two (asymmetric) and four (symmetry) spirality stress solids respectively, and symbolic significance is the same among the figure.On the principle, as meet above-mentioned condition, the guarantor's circular fiber that contains more stress solids also belongs to possibility, but its technology is quite complicated.
Present patent application has disclosed the special type of being invented and has protected circular fiber and manufacture method thereof, and has sketched the typical application example.Obviously, the some patterns of guarantor's circular fiber that disclosed in the present patent application book its to conceive substantially be unified, thus design still in addition reasoning deduce and form some different variation patterns.This type of is based on the variation of same design or revise pattern, can not be considered as being independent of new creation of the present invention, and is that those skilled in the art show and the result that is easy to get, so also belong to claim scope of the present invention.
Claims (8)
1. the optical fiber that can keep circular polarization state is characterized in that, forms one or one or more spirality stress acting body around fine axle rotation at the inside of optical fibre that has pulled into, in order to produce circular birefringence.
2. by the described optical fiber of claim 1, it is characterized in that described stress acting body is two and is asymmetric.
3. by the described optical fiber of claim 1, it is characterized in that described stress acting body is four and symmetry.
4. method for preparing the optical fiber that can keep circular polarization state, it is characterized in that, used prefabricated rods contains the stress cylinder of one or one above off-center axis, in the drawing optical fibers process, rotate this prefabricated rods and be about to the stress cylinder and pull into a helix, thereby make required high circular birefringence special optical fiber.
5. by the described method of claim 4, it is characterized in that the used prefabricated rods that contains one or one above off-axis stress acting body is (MCVD) to utilize the gaseous corrosion technology with boron oxide (B in the method at " Modified Chemical Vapor Deposition "
2O
3) sedimentary deposit, maybe can form stress acting body its plant the sedimentary deposit of material, corroded and made.
6. by the described method of claim 4, it is characterized in that, the used prefabricated rods that contains one or one above off-axis stress acting body is with " stress post embedment method ", or imbeds or be inserted in one or an above off-axis stress acting body and make with " extra heavy pipe cover buttress shaft " method.
7. the fiber optic component or the device that can keep circular polarization state is characterized in that, described element or device are to be made of the described optical fiber of circular polarization state that can keep of claim 1.
8. a fibre system that works in circular polarization state is characterized in that, this system comprises the described optical fiber and the described fiber optic component or the device that can keep circular polarization state of claim 7 that can keep circular polarization state of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92113821A CN1041129C (en) | 1992-12-26 | 1992-12-26 | Optic fibre in circular polarization state and is mfg. method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92113821A CN1041129C (en) | 1992-12-26 | 1992-12-26 | Optic fibre in circular polarization state and is mfg. method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1088894A CN1088894A (en) | 1994-07-06 |
| CN1041129C true CN1041129C (en) | 1998-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92113821A Expired - Lifetime CN1041129C (en) | 1992-12-26 | 1992-12-26 | Optic fibre in circular polarization state and is mfg. method |
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|---|---|
| CN (1) | CN1041129C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK3133426T3 (en) * | 2007-03-21 | 2019-10-07 | Nufern | OPTICAL FIBER ARTICLE FOR HANDLING GREATER ENERGY AND PROCEDURE FOR MANUFACTURING OR USING THEREOF |
| CN108107504A (en) * | 2016-11-25 | 2018-06-01 | 武汉长盈通光电技术有限公司 | A kind of guarantor's circular fiber and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5992929A (en) * | 1982-11-17 | 1984-05-29 | Nippon Telegr & Teleph Corp <Ntt> | Preparation of optical fiber maintaining polarization |
| JPS59137330A (en) * | 1983-01-20 | 1984-08-07 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of optical fiber sustaining polarization |
| JPS60155535A (en) * | 1983-12-27 | 1985-08-15 | コーニング グラス ワークス | Manufacture of optical fiber |
-
1992
- 1992-12-26 CN CN92113821A patent/CN1041129C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5992929A (en) * | 1982-11-17 | 1984-05-29 | Nippon Telegr & Teleph Corp <Ntt> | Preparation of optical fiber maintaining polarization |
| JPS59137330A (en) * | 1983-01-20 | 1984-08-07 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of optical fiber sustaining polarization |
| JPS60155535A (en) * | 1983-12-27 | 1985-08-15 | コーニング グラス ワークス | Manufacture of optical fiber |
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| Publication number | Publication date |
|---|---|
| CN1088894A (en) | 1994-07-06 |
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121226 Granted publication date: 19981209 |