GB2123810A - Fabrication of single polarization optical fibres - Google Patents
Fabrication of single polarization optical fibres Download PDFInfo
- Publication number
- GB2123810A GB2123810A GB08318117A GB8318117A GB2123810A GB 2123810 A GB2123810 A GB 2123810A GB 08318117 A GB08318117 A GB 08318117A GB 8318117 A GB8318117 A GB 8318117A GB 2123810 A GB2123810 A GB 2123810A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- elliptical
- glass tube
- silica glass
- ellipticity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01248—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing by collapsing without drawing
-
- 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
- C03B37/01217—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 for making preforms of polarisation-maintaining optical fibres
-
- 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
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
-
- 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
- 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
- C03B37/01861—Means for changing or stabilising the diameter or form of tubes or rods
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Glass tube 31 with internal low- melting glass coating 32 is made elliptical by evacuation and heating, then core rod 36 is inserted and integrated with the tube by heating under reduced pressure. The resulting preform is drawn to give a single polarisation optical fibre having core 41, cladding 42 and elliptical jacket 43 free from lengthwise variations of ellipticity. A high-melting glass coating 35 may be present on the core rod 36 or as a further coating in the tube (53, Fig. 6A). <IMAGE>
Description
SPECIFICATION
Process for fabrication of single polarization optical fibers
Background of the invention
This invention relates to a process for the fabrication of single polarization optical fibers, and more particularly to a process for the fabrication of single polarization optical fibers in which variation in lengthwise ellipticity is minimized.
Description of the prior art
Fig. 1 is a sectional view showing a single polarization optical fiber in which light-piping is effected without varying single mode plane of polarization and such single polarization optical fibre comprises a core 11 having refractive index n,, an elliptical jacket 12 having refractive index n2 (n, > n2) which surrounds the aforesaid core 11, a support 13 made of silica glass disposed on the outside of the aforesaid elliptical jacket 12, and a plastic jacket 14 being the outermost layer of the optical fiber. Materials of the core 11 and the elliptical jacket 12 are indicated as follows.
Construction Materials Core 11 (a) SiO2 (b) SiO2+B2O3 (C( SiO2+GeO2 (d) SiO2+P2O8 Elliptical (a) SiO2+B2O3 Jacket 12 (b SiO2+GeO2+B2O3 According to such single polarization optical fibers, anisotropic distortion generated due to difference in thermal expansion coefficients between materials of the elliptical jacket 12 and the support 13 is applied to the core 11 so that difference in propagation constants in two directions perpendicular to one another and at right angles to the transmitting direction can be increased, and thus single-mode light piping can be effected without varying the plane of polarization.
According to the above-mentioned single polarization optical fibers, however, there is such a case where B2O3,GeO2, or P205 (these substances increase refractive index n2) vaporizes from a vapor deposition layer which comes to be the core 11 by inwardly applying the same to the innermost layer of the silica glass tube becoming the support 13 to decrease its concentration in case of fabricating the optical fibers in accordance with, for example, Chemical Vapor Deposition (CVD) process. As a result, refractive index in the central part of the core 11 of a finished optical fiber decreases as shown in Fig. 2A or 2B so that transmission characteristics deteriorate.
Figs. 3A to 3C illustrate a process for the fabrication of single polarization optical fibers by which lowering of refractive index in the central part of the core 11 can be prevented. In Fig. 3A, a
glass rod 21 which will form the core 11 is drawn
while heating the rod by means of a H2-O2 burner 22. In Fig. 3B, a preform 27 vapor
deposited a layer 23 of which has been formed
into oval (whilst a silica glass tube 24 is restored
to round shape due to surface tension) is obtained
by reducing internal pressure of the silica glass
tube 24 while heating a glass rod 21 with the
silica glass tube 24 having a vapor deposition
layer 23 which will form an elliptical jacket 12 by
means of a H2-O2 burner 25 in such condition
that the glass rod 21 has been inserted into the
silica glass tube 21.Furthermore, in Fig, 3C, the
preform 27 formed in accordance with the
manner illustrated in Fig, 38 is subjected to wire
drawing while heating the same by means of a
carbon heater 26 to obtain a single polarization
optical fiber 28 (in this case, when total amount
of B203 and P205 of the elliptical jacket 1 2 is, for
example, 7 mol, evacuation of --5 mmH2O is
effected in order to attain ellipticity of 40%).
According to the process for the fabrication of
single polarization optical fibers illustrated in Fig.
3A-3C, however, even if internal pressure of the
silica glass tube 24 is reduced to -5 mmH2O for
obtaining the elliptical jacket 12 having 40%
ellipticity, there is such a case where the ellipticity of the elliptical jacket 12 varies in long direction within a range of, for instance, from 36% to 44%, because the silica glass tube 24 involves scattering (e.g., scattering of softening point due to variation in composition) in respect of material
in its long direction.
Summary of the invention
Accordingly, it is an object of the present invention to provide a process for the fabrication of single polarization optical fibers wherein ellipticity of its elliptical jacket does not vary in lengthwise direction.
It is another object of the present invention to provide a process for the fabrication of single polarization optical fibers which does not bring about a complicated production unit and by which there is no variation in ellipticity of its elliptical jacket layer in lengthwise direction.
Brief description of the invention
A process for the fabrication of single polarization optical fibers according to the present invention comprises the steps of forming a vapor deposition layer which turns into an elliptical layer on the inner surface of a silica glass tube, shaping the silica glass tube having the vapor deposition layer on the inner surface thereof to oval with a smaller ellipticity than that of the aforesaid elliptical layer, inserting a core rod into the silica glass tube thus ovally shaped to obtain a solid preform, and subjecting the aforesaid solid preform to wire drawing to fabricate a single polarization optical fiber.
Brief description of the drawings
Fig. 1 is a sectional view showing a single polarization optical fiber;
Figs. 2A and 2B are explanatory diagrams each illustrating refractive index of a core of the optical fiber shown in Fig. 1;
Figs. 3A, 3B and 3C are diagrams each showing progress in a conventional process for the fabrication of single polarization optical fibers;
Figs. 4A, 4B and 4C are diagrams showing progress in an embodiment of the process for the fabrication of single polarization optical fibers according to the present invention, respectively;
Fig. 5 is a sectional view showing a single polarization optical fiber fabricated in accordance with the present invention; and
Figs. 6A, 6B and 6C are diagrams showing progress in another embodiment of the process for the fabrication of single polarization fibers according to the present invention, respectively.
Detailed description of the invention
The present invention will specifically be described hereinbelow by referring to the accompanying drawings showing embodiments of the invention.
Figs. 4A to 4C illustrate a first embodiment of the present invention in which reference numeral 31 designates a silica glass tube having, for example, an outer diameter of 18 mm and a thickness of around 1.5 mm. A low-melting glass film 32 which will form an outside cladding is formed on the inside of the silica glass tube 31 to obtain a silica glass tube 33 with film (Fig. 4A).
The low-melting glass film 32 is made of B203+SiO2 glass or of glass containing at least two dopants such as B203, F, P205, GeO2 and the like, and the film is composed such that the melting point thereof is lower than that of other layers. A thickness of the low-melting glass film 32 is, for example, around 200 m.
The interior of the silica glass tube 33 with film is evacuated while heating the tube with film to obtain an elliptical tube 34 deformed with an ellipticity of 15% (Fig. 4B).
Thereafter, the resulting elliptical silica glass tube 34 with film is vertically held, and a core rod 36 is inserted into the elliptical silica glass tube 34 with film (Fig. 4C).
The core rod 36 is a solid rod fabricated by
VAD process or the like process and has an outer diameter of, for example, around 700 ,am which has previously been covered by a high-melting glass fllm 35 which will turn to an inside cladding.
The high-melting glass film 35 is made of highpurity SiO2, high-purity SiO2 containing F or the like, and it is required that the high-melting glass film 35 has a higher melting point than that of the aforesaid low-melting glass film 32, but the glass film 35 has not necessarily higher melting point than of the aforesaid silica glass tube 31 or the core rod 36. The combined materials as described above in the conditions shown in Fig. 4C are heated so as to be integral with each other while reducing pressure in response to a desired ellipticity where by a suitable preform is obtained.
As mentioned above, the silica glass tube 33 with film has previously been arranged to have 15% ellipticity, rod-in-tube method is applied thereto, and then, when quantity of reduced pressure is controlled in the process, a preform having an ellipticity in response to such quantity of reduced pressure can be prepared.
The preform thus prepared is subjected to wire drawing so that a single polarization optical fiber with an ellipticity of 400/0--60% can be fabricated. More specifically, a single polarization
optical fiber having 40% ellipticity can be obtained by
such manner that the silica glass tube 33 with film
having an ellipticity of 15% is used, 4
mol of P205 and 4 mol of B203 are added to the low-melting glass film 32, and pressure is
reduced to -1.0 mmH2O in the process. On one
hand, when total amount of P205 and B203 is arranged to be 9 mol, a single polarization optical fiber with 50% ellipticity can be fabricated under atmospheric pressure.
The present inventors have further continued their study so that the elliptical silica glass tube 34 with film having 20% ellipticity is shaped by
increasing further the ellipticity of the silica glass tube 33. Then, the core rod 36 covered by the
high-melting glass film 35 is inserted in the
resulting silica glass tube 34 with film, and they are evacuated and heated to obtain a preform by a similar manner to that described above.
In this case, a preform having an ellipticity of 20% or more could also easily be obtained.
More specifically, the elliptical silica glass tube 34 with film having an ellipticity of 20% and an inner diameter 2 mm was shaped, the core rod 36 covered by a glass film and having an outer diameter of 700 ym was inserted into the silica glass tube 34, internal pressure of the resulting elliptical silica glass tube was reduced to -20 mmH2O while holding vertically the same (total amount of P205 and B203 being 6 mol), and the silica glass tube and the core rod inserted therein were heated to obtain a preform. A single polarization optical fiber obtained by subjecting the preform to wire drawing has an ellipticity of 40% and a coupling length of 4 mm at wavelength O.63,um.
When it is supposed that an ellipticity usually
required for a single polarization optical fiber is within the range of 40%60%, an ellipticity of the elliptical silica glass tube 34 with film to which rod-in-tube method is to be applied may be
selected within a range of 1 5%-40%.
Furthermore, a definition of ellipticity E is given
as follows:
major axis-minor axis E= x100(%).
major axis+minor axis
The term "ellipticity" used herein means the
one in the external shape of the outside cladding
12 in case of a single polarization optical fiber or
its preform, whilst it means the one in the external
shape itself in case of the elliptical silica glass tube 34 with film.
Fig. 5 illustrated a single polarization optical fiber fabricated in the present invention in which reference numeral 41 designates a circular core preferably made of SiO2+GeO2 glass or the like, 42 a cladding having a circular section and made of high-purity SiO2 glass, 43 an elliptical jacket substantially composed of SiO2+P20+82O3 glass, 44 a support containing SiO2 as the principal component, and 45 a plastic jacket, respectively.
Fig. 6A to Fig. 6C illustrate a second
embodiment of the present invention in which
reference numeral 51 designates a silica glass tube having, for instance, an outer diameter of 18
mm and a thickness of around 1.5 mm.
The low-melting glass film 52 which will form an outside cladding is formed on the inner wall of the silica glass tube 51.
The low-melting glass film 52 is made of 8203+SiO2 glass or of glass containing at least two dopants such as B203, F, P205, GeO2 and the
like, and the film is composed such that the
melting point thereof is lower than that of other layers. A thickness of the low-melting glass film 52 is, for example, around 200,us.
A high-melting glass film 53 which will form an inside cladding is further formed on the inside of the low-melting glass film 52 to obtain a silica glass tube 54 with film (Fig. 6A).
The high-melting glass film 53 is made of highpurity SiO2 high-purity SiO2 containing F or the like, and it is required that the high-melting glass film 53 has a higher melting point than that of the aforesaid low-melting glass film 52, but the glass film 53 has not necessarily higher melting point than that of the aforesaid silica glass tube 51 or a core rod which will be described hereunder.
A thickness of, for instance, around 30 ym is suitable for the high-melting glass film 53.
The interior of the silica glass tube 54 with film is evacuated while heating the same to obtain an elliptical tube 55 deformed with an ellipticity of 1 5% (Fig. 6B).
Thereafter, the resulting elliptical silica glass tube 55 with film is vertically held, and a core rod 56 is inserted into the elliptical silica glass tube 55 with film (Fig. 6C).
The core rod 56 is a solid rod fabricated by
VAD process or the like process and has an outer diameter of, for example, around 700 jum.
The combined materials as described above in the conditions shown in Fig. 6C are heated so as to be integral with each other while reducing pressure in response to a desired ellipticity, whereby a suitable preform is obtained.
As mentioned above, the silica glass tube 54 with film has previously been arranged to have 1 5%-40% ellipticity, rod -in-tube method is applied thereto, and then, when quantity of reduced pressure is controlled in the process, a preform having a prescribed ellipticity can easily be prepared.
The preform thus prepared is subjected to wire drawing so that a single polarization optical fiber with an ellipticity of 400/60% can be fabricated.
The present inventors have further continued their work so that the elliptical silica glass tube 55 with film having 20% ellipticity is shaped by increasing further the ellipticity of the silica glass tube 54 with film. Then, the core rod 56 is inserted in the resulting silica glass tube 55 with film, and they are evacuated and heated to obtain a preform by a similar manner to that described above.
In this case, the elliptical silica glass tube 55 with film having an ellipticity of 20% and an inner diameter 2 mm was shaped, the core rod 56 having an outer diameter of 700 ,um was inserted into the silica glass tube 55, internal pressure of the resulting elliptical silica glass tube was reduced to -20 mmH2O while holding vertically the same (total amount of P205 and B203 being 6 mol), and the silica glass tube and the core rod inserted therein were heated to obtain a preform.
A single polarization optical fiber obtained by subjecting the preform to wire drawing had an ellipticity of 40% and a coupling length of 4mmm at wavelength 0.63 ,*4m.
As described above, in accordance with the present invention, a silica glass tube with film has previously been shaped into oval so that even if the silica glass tube involves any variable factor in its lengthwise direction, the elliptical layer thereof can be smoothly shaped. Hence, the single polarization optical fiber of the present invention can suppress variation of the ellipticity in lengthwise direction. In addition, the advantages of the present invention other than that described above are as follows.
(1) A solid single polarization optical fiber can be obtained, because whose core is not formed in accordance with modified CVD process (internal vapor deposition), but rod-in-tube method.
(2) A single polarization optical fiber having an ellipticity of 40%-60% and which does not vary in lengthwise direction can easily be fabricated by controlling quantity of pressure to be reduced in the case when whose silica glass tube and core rod are solidified so as to be integral with each other. This is because the silica glass tube with film is shaped with an ellipticity of 1 5%-40%, and then, rod-in-tube method is applied thereto.
Arthough the present invention has been described with reference to preferred embodiments thereof, many modifications and alteration may be made within the spirit and scope of the present invention.
Claims (1)
- Claims1. A process for the fabrication of single polarization optical fibers comprising the steps of: forming a low-melting glass film which will form an elliptical layer on the inner surface of a silica glass tube to obtain a silica glass tube with film; shaping said silica glass tube with film to oval with a smaller ellipticity than that of said elliptical layer to obtain an elliptical silica glass tube with film; inserting a core rod into said elliptical silica glass tube with film and heating said elliptical silica glass tube with film and said core rod inserted therein so as to be integral with each other while reducing pressure to obtain a preform; and subjecting said preform to wire drawing to obtain a single polarization optical fiber possessing the elliptical layer of a prescribed ellipticity.2. A process for the fabrication of single polarization optical fibers as claimed in claim 1 wherein an ellipticity of said elliptical silica glass tube with film is within a range of 1 5-40%.3. A process for the fabrication of single polarization optical fibers as claimed in claim 1 wherein an ellipticity of said elliptical layer is within a range of 4060%.4. A process for the fabrication of single polarization optical fibers comprising the steps of: forming a low-melting glass film which will form an elliptical layer on the inner surface of a silica glass tube to obtain a silica glass tube with film; shaping said silica glass tube with film to oval with a smaller ellipticity than that of said elliptical layer to obtain an elliptical silica glass tube with film; inserting a core rod covered by a high-melting glass film which will form a cladding layer into said elliptical silica glass tube with film and heating said elliptical silica glass tube with film and said core rod inserted therein so as to be integral with each other while reducing pressure to obtain a preform; and subjecting said preform to wire drawing to obtain a single polarization optical fiber possessing the elliptical layer of a prescribed ellipticity.5. A process for the fabrication of single polarization optical fibers as claimed in claim 4 wherein an ellipticity of said elliptical silica glass tube with film is within a range of 1 5-40%.6. A process for the fabrication of single polarization optical fibers as claimed in claim 4 wherein an ellipticity of said elliptical layer is within a range of 40-60%.7. A process for the fabrication of single polarization optical fibers comprising the steps of: forming successively a low-melting glass film which will form an elliptical layer and a high melting glass film which will form a cladding layer on the inner surface of a silica glass tube to obtain a silica glass tube with film; shaping said silica glass tube with film to oval with a smalier ellipticity than that of said elliptical layer to obtain an elliptical silica glass tube with film; inserting a core rod into said elliptical silica glass tube with film and heating said elliptical silica glass tube with film and said core rod inserted therein so as to be integral with each other while reducing pressure to obtain a preform; and subjecting said preform to wire drawing to obtain a single polarization optical fiber possessing the elliptical layer of a prescribed ellipticity.8. A process for the fabrication of single polarization optical fibers as claimed in claim 7 wherein an ellipticity of said elliptical silica glass tube with film is within a range of 1 5-40%.8. A process for the fabrication of single polarization optical fibers as claimed in claim 7 wherein an ellipticity of said elliptical layer is within a range of 4060%.10. A process for the fabrication of single polarization optical fibers, substantially as hereinbefore described with reference to Figures 4A-C or Figures 6A-C of the accompanying drawings.11. A single polarization optical fiber substantially as hereinbefore described with reference to Figure 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57122630A JPS5913643A (en) | 1982-07-14 | 1982-07-14 | Manufacture of optical fiber retaining plane of polarization |
| JP57123372A JPS5913645A (en) | 1982-07-15 | 1982-07-15 | Manufacture of optical fiber retaining plane of polarization |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8318117D0 GB8318117D0 (en) | 1983-08-03 |
| GB2123810A true GB2123810A (en) | 1984-02-08 |
| GB2123810B GB2123810B (en) | 1986-12-03 |
Family
ID=26459723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08318117A Expired GB2123810B (en) | 1982-07-14 | 1983-07-04 | Fabrication of single polarization optical fibres |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2530234B1 (en) |
| GB (1) | GB2123810B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2603387A1 (en) * | 1986-09-01 | 1988-03-04 | Hitachi Cable | FIBER PRESERVING A POLARIZED WAVE |
| GB2221903A (en) * | 1988-05-27 | 1990-02-21 | Hitachi Cable | Method of producing elliptic core type polarization-maintaining optical fibre |
| EP0381473A2 (en) * | 1989-02-03 | 1990-08-08 | Minnesota Mining And Manufacturing Company | Polarization-maintaining optical fiber |
| WO1991013329A1 (en) * | 1990-02-26 | 1991-09-05 | University College London | Pressure sensor |
| US5180410A (en) * | 1990-07-30 | 1993-01-19 | Corning Incorporated | Method of making polarization retaining fiber |
| EP1061054A1 (en) * | 1999-06-18 | 2000-12-20 | Lucent Technologies Inc. | Method of making optical fiber by a rod-in tube process and fiber made by the method |
| US7155097B2 (en) | 2001-03-09 | 2006-12-26 | Crystal Fibre A/S | Fabrication of microstructured fibres |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184859A (en) * | 1978-06-09 | 1980-01-22 | International Telephone And Telegraph Corporation | Method of fabricating an elliptical core single mode fiber |
| GB2033372B (en) * | 1978-09-28 | 1983-01-19 | Sumitomo Electric Industries | Method of producing an optical waveguide |
| DE2930704A1 (en) * | 1979-07-28 | 1981-02-12 | Licentia Gmbh | Glass optical waveguide fibre - which has oval cross=section used to separate two light waves polarised in orthogonal directions |
-
1983
- 1983-07-04 GB GB08318117A patent/GB2123810B/en not_active Expired
- 1983-07-18 FR FR8311810A patent/FR2530234B1/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2603387A1 (en) * | 1986-09-01 | 1988-03-04 | Hitachi Cable | FIBER PRESERVING A POLARIZED WAVE |
| GB2221903A (en) * | 1988-05-27 | 1990-02-21 | Hitachi Cable | Method of producing elliptic core type polarization-maintaining optical fibre |
| GB2221903B (en) * | 1988-05-27 | 1992-06-10 | Hitachi Cable | Method of producing elliptic core type polarization-maintaining optical fiber |
| EP0381473A2 (en) * | 1989-02-03 | 1990-08-08 | Minnesota Mining And Manufacturing Company | Polarization-maintaining optical fiber |
| EP0381473A3 (en) * | 1989-02-03 | 1990-12-27 | Minnesota Mining And Manufacturing Company | Polarization-maintaining optical fiber |
| WO1991013329A1 (en) * | 1990-02-26 | 1991-09-05 | University College London | Pressure sensor |
| US5180410A (en) * | 1990-07-30 | 1993-01-19 | Corning Incorporated | Method of making polarization retaining fiber |
| EP1061054A1 (en) * | 1999-06-18 | 2000-12-20 | Lucent Technologies Inc. | Method of making optical fiber by a rod-in tube process and fiber made by the method |
| US7155097B2 (en) | 2001-03-09 | 2006-12-26 | Crystal Fibre A/S | Fabrication of microstructured fibres |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2530234A1 (en) | 1984-01-20 |
| GB8318117D0 (en) | 1983-08-03 |
| FR2530234B1 (en) | 1986-10-17 |
| GB2123810B (en) | 1986-12-03 |
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| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19980704 |