Optical fiber with lens and method of manufacturing the same
Abstract
An optical fiber with lens of a simple construction capable of taking in a flat beam of light efficiently and improving the optical coupling efficiency between an LD and a fiber, and a method of manufacturing the same. Diagonal cut surfaces are provided on both sides of a center line passing the center of a core at an end of an optical fiber which is opposed to a light source or the outgoing light, whereby a wedge-like end portion is formed, a semicylindrical lens formed to a desired radius of curvature being thus provided at this end of the optical fiber. Portions of a desired radius of curvature which extend in two orthogonal directions are further provided at this end of the optical fiber.
Term
Term ended
Projected expiry passed 18 September 2015, 11 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
4 claims: 4 independent, 0 dependent
- 1An optical fiber with a pointed cylindrical lens characterized by the fact that a diagonal cut surface was made to form a wedge in one part of the end of an optical fiber facing the light source or emitting light, and a desired curvature was placed at this tip.
- 2An optical fiber with a pointed elliptic lens characterized by the fact that a diagonal cut surface was made to form a wedge in one part of the end of an optical fiber facing the light source or emitting light and desired curvatures were placed in two orthogonal directions at this tip.
- 3A manufacturing process for an optical fiber with a tapered cylindrical lens characterized by the fact that a wedge form fiber was made by lapping the end surface of the optical fiber from one side of the fiber by mechanical grinding and lapping from one side, rotating 180° when lapped to the center of the fiber and grinding from the opposite direction;and then lapping the tip to give it the desired curvature.
- 4A manufacturing process for an optical fiber with a tapered elliptic lens characterized by the fact that a wedge form fiber was made by lapping the end surface of the optical fiber from one side of the fiber by mechanical grinding and lapping from one side, rotating 180° when lapped to the center of the fiber and grinding from the opposite direction;then lapping the tip to give it a desired curvature and further lapping to give a desired curvature in a direction orthogonal to the above.
Independent claims4
44 paragraphs, as filed
Field of Technology
0001This invention relates to the optical coupling between a luminescent source and an optical fiber used in optical communication.
Technology in the Background
0002Laser Diodes (called LD hereafter), Luminescent Diodes, and others are used as a luminescent source for optical communication. However, in order for light to enter into an optical fiber, which is the optical transmission path, coupling is generally performed by aligning the end of an optical fiber with the luminescent surface.
0003However, due to a considerable divergence in the angle of incident light from the luminescent surface, the coupling efficiency with optical fibers is poor. Consequently, there is a method to improve light entrance into the optical fiber by inserting a lens to improve coupling efficiency and focusing of the light.
0004In order to obtain optical coupling between an LD and an optical fiber, diverse combinations such as shown in Fig. 5 (a) - (d) have been considered in the past. The light emitted from the LD does not form a circular Gaussian distribution but forms an elliptic beam having a large distribution difference in the vertical and horizontal directions.
0005Fig. 6 is a diagram that depicts the diverging angle of the incident beam from the LD. As seen, the near-end light distribution NFP [near focal point] is elongated along the X-axis, and the far-end light distribution NFP results in an elliptic beam distribution divergent along the Y-axis. Therefore, high coupling efficiency is not obtainable.
0006The method of coupling shown in Fig. 5 (a) was an early concept. It attempts to increase the coupling efficiency by positioning a cylindrical lens 21 between LD 1 and optical fiber 20.
0007The methods of coupling shown in Fig. 5 (c) and (d), both ignore ellipticity and both use a nonspherical lens 22, which take light beam aberrations into account, or in order to ease coupling tolerances during assembly, places two lenses 23 and 24 at the confocal positions.
0008In this case, the lenses cost more than the optical fiber type, but the merit of realizing equally good coupling is assured. However, since the lens and fibers are separated in all examples of Fig. 5 (a), (c), and (d), alignment of the beam axis becomes that much more difficult; since an interface occurs in the optical path, light will be lost as a consequence. In addition, although an antireflection film is used, it is not beneficial because there are three surfaces in this case. Furthermore, the fact that there are numerous components raises the overall cost of the system.
0009On the other hand, in the case of Fig. 5 (b) example, a curved surface 25 was formed at the end of the fiber 20 and symmetric to the Z axis, which is the optical axis. Although this alleviated the previously described shortcomings, the beam emitted from LD 1, in spite of its elliptical nature, is coupled to a circular core, which enables axial alignment only in an extremely narrow range and theoretically sets a limitation as well.
0010In particular, in the case of a distorted Lattice Type Quantum Well Laser, which is anticipated as an LD for optical excitation for light amplification, it becomes necessary to obtain a spacious active layer section in order to increase the inrush current. As a result, the light-emitting window formed on the side ends up in a horizontally extended (about 0-200 µm) shape without a change in the thickness (about 0-200 µm). This is a greater compression compared with the conventional LD, and in order to couple the beams more efficiently, an oblate lens matching the far-end distribution became necessary.
0011In view of the above-mentioned problems, the purpose of this invention is to offer an optical fiber with lens which, as opposed to the method of assembling special individual lenses, has a simple configuration, is capable of efficiently taking in flat beams, and has an improved optical coupling efficiency between an LD and a fiber.
Disclosure of the Invention
0012This invention was made in order to solve the problems in conjunction with the above. The optical fiber with lens based on this invention is equipped with a diagonal section forming a wedge on either side of the center line in reference to the core center of the optical fiber end facing the optical source or emission beam, and forms a semi-cylindrical lens by providing a desired curvature at the tip.
0013By providing a curvature greater than the radius of the said semi-cylinder in the direction of the semi-cylinder curve at the end of the semi-cylindrical lens, curved facets having different curvatures at the tip and are orthogonal to each other are formed.
0014In the case of this invention for an optical fiber with a lens, it is structured as described above and is equipped with a fiber lens which enables a simple coupling method. In addition, as it is capable of accepting a flat beam, a high coupling efficiency can be obtained.
0015In other words, it will be possible to couple beams emitted from a high output LD or LED with a flat emission tip.
0016In the case of this invention for an optical fiber with a lens, it is structured as described above and equipped with a fiber lens which enables a simple coupling method. In addition, as it is capable of accepting a flat beam, a high coupling efficiency can be obtained, and a flat beam can be used at a low cost. It can present an optical fiber with a lens with an improved coupling efficiency between a semiconductor laser and an optical fiber.
Simple Explanation of Diagrams
0017Fig. 1 shows three views of the shape of a fiber with a tapered cylindrical lens which depicts an example of this invention.
0018Fig. 2 shows three views of the shape of a fiber with a tapered elliptic lens which depicts another example of this invention.
0019Fig. 3 is a diagram depicting a manufacturing method of a fiber with a lens as an example of this invention.
0020Fig. 4 is a diagram explaining the formation of a flat beam waist.
0021Fig. 5 is a diagram showing a beam coupling method for a conventional LD and a fiber.
0022Fig. 6 is a diagram depicting the divergent angle of the emitting beam from an LD.
The best form example of this invention
0023Examples of this invention are explained below in reference to the diagrams. Fig. 1 shows three views of the shape of a fiber with a tapered cylindrical lens which depicts an example of this invention. Fig. 2 shows three views of the shape of a fiber with a tapered elliptic lens which is another example of this invention. Fig. 3 is a diagram depicting the manufacturing method of a fiber with a lens as an example of this invention. Fig. 4 is a diagram explaining the formation of a flat beam waist.
0024To form the fiber with a lens based on this invention, the wedge form fiber is made by lapping a fiber from one side as shown in Fig. 3. When the fiber is lapped to the center, it is rotated 180 degrees to lap from the opposite direction. A suitable amount of lapping is used to produce a desired curvature at the tip.
0025Figs. 1 and 2 are examples of those shapes. The result in Fig. 1 is a semicylindrical lens, which is suitable for a highly elliptic LD. Fig. 2 is a shape endowed with a focusing effect even for a divergent light in the Y axis direction in Fig. 4.
0026Next, by referring to Fig. 4, an explanation is given on the principle of efficient entry of the light beam emitted from an LD into the fiber with a tapered cylindrical lens.
0027The radius of the beam waist in the Y-axis direction at the window C of the LD 1 is denoted as ω<sub>y</sub>, the radius of the beam waist in the X-axis direction is denoted ω<sub>x</sub>, and the core radius of the single mode fiber (called SMF hereafter) 2 is denoted as ω.
0028The distance, d<sub>0</sub>, from the fiber tip A of the fiber with a tapered cylindrical lens to the beam waist radius, ω<sub>0</sub>, inside the fiber with a tapered cylindrical lens is obtained.
0029In the case of an SMF, the beam enters at a refractive index, NA = 0.1. On the other hand, when the refractive index n of the fiber core 3 is n = 1.465, and the core diameter is 2ω = 6µm; from<maths id="math0001" num="Equation 1"><math display="block"><mrow><mtext>θ</mtext><msub><mrow><mtext></mtext></mrow><mrow><msub><mrow><mtext>(d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext>)</mtext></mrow></msub><msup><mrow><mtext> = tan</mtext></mrow><mrow><mtext>-1</mtext></mrow></msup><mtext></mtext><mfenced open="(" close=")"><mrow><mfrac><mrow><msub><mrow><mtext>λ·d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub></mrow><mrow><msub><mrow><mtext>π·ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msup><mrow><mtext> </mtext></mrow><mrow><mtext>2</mtext></mrow></msup><mtext>·n</mtext></mrow></mfrac></mrow></mfenced><mtext> = 3.914 deg</mtext></mrow></math><img file="EP0802433A1_D0001.tif" /></maths> and<maths id="math0002" num=""><math display="block"><mrow><mtable><mtr><mtd><mrow><mtable><mtr><mtd><mrow><mtable><mlabeledtr><mtext>Equation 2</mtext><mtd><mrow><msub><mrow><mtext>ω</mtext></mrow><mrow><mtext>y</mtext></mrow></msub><msub><mrow><mtext> = ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msqrt><mtext>1 + </mtext><mfenced open="(" close=")"><mrow><mfrac><mrow><msub><mrow><mtext>λ·d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub></mrow><mrow><msub><mrow><mtext>π·ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msup><mrow><mtext> </mtext></mrow><mrow><mtext>2</mtext></mrow></msup><mtext>·n</mtext></mrow></mfrac></mrow></mfenced></msqrt><msub><mrow><mtext> = ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msqrt><msub><mrow><mtext>1 + tan θ(d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext>)</mtext></msqrt></mrow></mtd></mlabeledtr></mtable></mrow></mtd></mtr><mtr><mtd><mrow><msub><mrow><mtext>ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> = </mtext><mfrac><mrow><msub><mrow><mtext>ω</mtext></mrow><mrow><mtext>y</mtext></mrow></msub></mrow><mrow><msqrt><msub><mrow><mtext>1 + tan θ(d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext>)</mtext></msqrt></mrow></mfrac></mrow></mtd></mtr></mtable></mrow></mtd></mtr></mtable></mrow></math><img file="EP0802433A1_D0002.tif" /></maths>
0030Therefore, ω<sub>0</sub> =2.9024 µm results from Equations 1 and 2.
0031Conversely,<maths id="math0003" num="Equation 3"><math display="block"><mrow><msub><mrow><mtext>d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> = </mtext><mfrac><mrow><msub><mrow><mtext>tan θ(d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msub><mrow><mtext>)·π·ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msup><mrow><mtext> </mtext></mrow><mrow><mtext>2</mtext></mrow></msup><mtext>·n</mtext></mrow><mrow><mtext>λ</mtext></mrow></mfrac></mrow></math><img file="EP0802433A1_D0003.tif" /></maths>
0032For example, assuming that the wavelength of the beam is λ = 830 nm, and substituting n = 1.465 into Equation 3, d<sub>0</sub> = 3.12 µm results.
0033Now, in order to obtain the distance d from the fiber tip A of the fiber with a tapered cylindrical lens to the window C of the LD, the lens curvature is denoted as R; and d is determined by the beam matrix expressed by Equation 4,<maths id="math0004" num=""><math display="block"><mrow><msub><mrow><mtext>(M</mtext></mrow><mrow><mtext>1</mtext></mrow></msub><mtext>) = </mtext><mfenced open="(" close=")"><mrow><mtable><mtr><mtd><mtext>1</mtext></mtd><mtd><mtext>d</mtext></mtd></mtr><mtr><mtd><mtext>0</mtext></mtd><mtd><mtext>1</mtext></mtd></mtr></mtable></mrow></mfenced><mtext></mtext><mfenced open="(" close=")"><mrow><mtable columnalign="left center"><mtr><mtd><mtext>1</mtext></mtd><mtd><mtext>0</mtext></mtd></mtr><mtr><mtd><mfrac><mrow><mtext>1 - n</mtext></mrow><mrow><mtext>R</mtext></mrow></mfrac></mtd><mtd><mtext>n</mtext></mtd></mtr></mtable></mrow></mfenced><mtext></mtext><mfenced open="(" close=")"><mrow><mtable><mtr><mtd><mtext>1</mtext></mtd><mtd><msub><mrow><mtext>d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub></mtd></mtr><mtr><mtd><mtext>0</mtext></mtd><mtd><mtext>1</mtext></mtd></mtr></mtable></mrow></mfenced><mspace linebreak="newline" /><mtext> = </mtext><mfenced open="(" close=")"><mrow><mtable><mtr><mtd><mtext>1 + </mtext><mfrac><mrow><mtext>1 - n</mtext></mrow><mrow><mtext>R</mtext></mrow></mfrac><mtext>·d</mtext></mtd><mtd><msub><mrow><mtext>d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> + </mtext><mfrac><mrow><mtext>1 - n</mtext></mrow><mrow><mtext>R</mtext></mrow></mfrac><msub><mrow><mtext>·d·d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> + n·d</mtext></mtd></mtr><mtr><mtd><mfrac><mrow><mtext>1 - n</mtext></mrow><mrow><mtext>R</mtext></mrow></mfrac></mtd><mtd><mfrac><mrow><mtext>1 - n</mtext></mrow><mrow><mtext>R</mtext></mrow></mfrac><msub><mrow><mtext>·d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> + n</mtext></mtd></mtr></mtable></mrow></mfenced><mtext> = </mtext><mfenced open="(" close=")"><mrow><mtable><mtr><mtd><mtext>A</mtext></mtd><mtd><mtext>B</mtext></mtd></mtr><mtr><mtd><mtext>C</mtext></mtd><mtd><mtext>D</mtext></mtd></mtr></mtable></mrow></mfenced></mrow></math><img file="EP0802433A1_D0004.tif" /></maths>
0034In other words, from the general beam matrix equation,<maths id="math0005" num="Equation 5"><math display="block"><mrow><msup><mrow><mfenced open="(" close=")"><mrow><mfrac><mrow><mtext>ω</mtext><msub><mrow><mtext></mtext></mrow><mrow><mtext>y</mtext></mrow></msub></mrow><mrow><mtext>ω</mtext><msub><mrow><mtext></mtext></mrow><mrow><mtext>0</mtext></mrow></msub></mrow></mfrac></mrow></mfenced></mrow><mrow><mtext>2</mtext></mrow></msup><mtext> = </mtext><mfrac><mrow><mtext>1</mtext></mrow><mrow><msup><mrow><mfenced open="(" close=")"><mrow><mfrac><mrow><mtext>π·ω</mtext><msub><mrow><mtext></mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> </mtext><msup><mrow><mtext></mtext></mrow><mrow><mtext>2</mtext></mrow></msup></mrow><mrow><mtext>λ</mtext></mrow></mfrac></mrow></mfenced></mrow><mrow><mtext>2</mtext></mrow></msup><msup><mrow><mtext>·C</mtext></mrow><mrow><mtext>2</mtext></mrow></msup><msup><mrow><mtext> + D</mtext></mrow><mrow><mtext>2</mtext></mrow></msup></mrow></mfrac></mrow></math><img file="EP0802433A1_D0005.tif" /></maths> whereby ω<sub>y</sub> can be obtained. For example, when the curvature R = 10 µm, ω<sub>y</sub> = 1.32 µm results. Conversely, when ω<sub>y</sub> is known, an optimum curvature R can be obtained.
0035Similarly, from<maths id="math0006" num="Equation 6"><math display="block"><mrow><msup><mrow><mfenced open="(" close=")"><mrow><mfrac><mrow><mtext>ω</mtext></mrow><mrow><mtext>ω</mtext><msub><mrow><mtext></mtext></mrow><mrow><mtext>0</mtext></mrow></msub></mrow></mfrac></mrow></mfenced></mrow><mrow><mtext>2</mtext></mrow></msup><msup><mrow><mtext> = A</mtext></mrow><mrow><mtext>2</mtext></mrow></msup><mtext> + </mtext><msup><mrow><mfenced open="(" close=")"><mrow><mfrac><mrow><mtext>λ</mtext></mrow><mrow><mtext>π·ω</mtext><msub><mrow><mtext></mtext></mrow><mrow><mtext>0</mtext></mrow></msub><mtext> </mtext><msup><mrow><mtext></mtext></mrow><mrow><mtext>2</mtext></mrow></msup></mrow></mfrac></mrow></mfenced></mrow><mrow><mtext>2</mtext></mrow></msup><mtext> · B</mtext></mrow></math><img file="EP0802433A1_D0006.tif" /></maths> d = 15.22 µm is obtained. At this time, since ω<sub>x</sub> has no lens effect,<maths id="math0007" num="Equation 7"><math display="block"><mrow><msub><mrow><mtext>ω</mtext></mrow><mrow><mtext>1x</mtext></mrow></msub><msub><mrow><mtext> = ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msqrt><mtext>1+</mtext><mfenced open="(" close=")"><mrow><mfrac><mrow><mtext>λ</mtext><mfenced open="(" close=")"><mrow><mfrac><mrow><msub><mrow><mtext>d</mtext></mrow><mrow><mtext>0</mtext></mrow></msub></mrow><mrow><mtext>n</mtext></mrow></mfrac><mtext> + d</mtext></mrow></mfenced></mrow><mrow><msub><mrow><mtext>π·ω</mtext></mrow><mrow><mtext>0</mtext></mrow></msub><msup><mrow><mtext> </mtext></mrow><mrow><mtext>2</mtext></mrow></msup></mrow></mfrac></mrow></mfenced><msup><mrow><mtext></mtext></mrow><mrow><mtext>2</mtext></mrow></msup></msqrt></mrow></math><img file="EP0802433A1_D0007.tif" /></maths> is expressed. For example, when d<sub>0</sub> = 3.12 and ω<sub>0</sub> = 2.9024, ω<sub>x</sub> = 3,4 µm results.
0036In other words, the beam emitted from the semicircular lens fiber is able to form a flat beam waist of ω<sub>x</sub> = ca. 3.4 µm and ω<sub>y</sub> = ca. 1.3 µm at a position of d = ca. 15 µm from the lens tip A, if the wavelength is = 830 nm and the core diameter of the SMF is 2ω = 6 µm, and when the curvature R = 10 µm.
0037Consequently, when a high output semiconductor laser having a relatively smaller ω<sub>y</sub> compared to ω<sub>x</sub> is used, a fiber lens compatible to the flattened, irradiating window of <maths id="math0008" num=""><math display="inline"><mrow><msub><mrow><mtext>(ω</mtext></mrow><mrow><mtext>y</mtext></mrow></msub><msub><mrow><mtext>/ω</mtext></mrow><mrow><mtext>x</mtext></mrow></msub><mtext>) = ca. 1/3 - 1/5</mtext></mrow></math><img file="EP0802433A1_D0008.tif" /></maths>, can be formed, and a high coupling efficiency can be obtained.
0038The manufacturing processes involve stabilizing the optical fiber and lapping it at 25° to the optical axis to the center of the fiber using an abrasive board. Then, the stabilized fiber is turned upside down 180° and shaped to a wedge form by lapping at 25° to the optical axis as before using an abrasive board.
0039Subsequently, the fiber is lap-finished to a curvature of R = 10 µm at the wedged tip by rotating it around the optical axis.
14 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| WO03076994A1 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| EP0971252A3 | Cited by | European Patent Office (EPO) | Search report |
| EP1109042A1 | Cited by | European Patent Office (EPO) | Search report |
| WO0039620A3 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| EP1298460A1 | Cited by | European Patent Office (EPO) | Search report |
| US6597835B2 | Cited by | United States of America | Applicant |
| US6963682B2 | Cited by | United States of America | Applicant |
| US6904197B2 | Cited by | United States of America | Applicant |
| EP1109042A1 | Cited by | European Patent Office (EPO) | Search report |
| EP0971252A2 | Cited by | European Patent Office (EPO) | Search report |
| WO03076992A1 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| US7099535B2 | Cited by | United States of America | Applicant |
| EP1109043A1 | Cited by | European Patent Office (EPO) | Search report |
| US6332721B1 | Cited by | United States of America | Applicant |
| WO0039620A2 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| CN1317579C | Cited by | China | Search report |
| WO0039620A3 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| EP1298460A4 | Cited by | European Patent Office (EPO) | Search report |
| WO0019253A1 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| GB2077943A | Cites | United Kingdom | Search report |
| US3910677A | Cites | United States of America | Search report |
8 members in 6 offices
Priority claims7
| Document | Office | Kind | Date |
|---|---|---|---|
| 24863394 | Japan | A | |
| 24863394 | Japan | – | |
| 9501853 | Japan | W | |
| WO1995JP01853 | – | – | – |
| JP19940248633 | – | – | – |
| JP9501853 | – | – | – |
| 24863394 | – | – | – |
Members8
| Document | Office | Kind | |
|---|---|---|---|
| CA2200072A1 | Canada | A1 | |
| WO9608738A1 | World Intellectual Property Organization (WIPO) | A1 | |
| JPH0886923A | Japan | A | |
| EP0802433A1This record | European Patent Office (EPO) | A1 | |
| EP0802433A4 | European Patent Office (EPO) | A4 | |
| DE802433T1 | Germany | T1 | |
| US5845024A | United States of America | A | |
| CA2200072C | Canada | C |
17 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Application refused18R | 18R | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE APPLICATION HAS BEEN REFUSEDSTAA | STAA | |
| Appeal procedure closedAppealORIGINAL CODE: EPIDOSNNOA9EAPBT | APBT | |
| Appeal reference modifiedAppealORIGINAL CODE: EPIDOSCREFNEAPAF | APAF | |
| Appeal reference recordedAppealORIGINAL CODE: EPIDOS REFNAPAA | APAA | |
| Date of receipt of statement of grounds of appeal recordedAppealORIGINAL CODE: EPIDOSNNOA3EAPBR | APBR | |
| Date of receipt of notice of appeal recordedAppealORIGINAL CODE: EPIDOSNNOA2EAPBN | APBN | |
| First examination report despatched17Q | 17Q | |
| De: translation of patent claimsDET | DET | |
| Nl: translation of patent claims filedTCNL | TCNL | |
| Fr: translation of claims filedEL | EL | |
| It: translation for ep claims filedITCL | ITCL | |
| Request for examination filed17P | 17P | |
| Supplementary search report drawn up and despatchedA4 | A4 | |
| Designated contracting statesAK | AK | |
| Designated contracting statesAK | AK | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI |
Numbers
- Publication
- 0802433
- Publication, DOCDB
- 0802433
- Publication, EPODOC
- EP0802433
- Application
- 95931431
- Application, DOCDB
- 95931431
- Application, EPODOC
- EP19950931431
Titles3
- German
- OPTISCHE FASER MIT LINSE UND VERFAHREN ZU DEREN HERSTELLUNG
- English
- OPTICAL FIBER WITH LENS AND METHOD OF MANUFACTURING THE SAME
- French
- FIBRE OPTIQUE A LENTILLE ET SON PROCEDE DE FABRICATION
Classification
- CPC, 2
- G02B6/4203
- G02B6/4206
- IPC, 7
- G02B6 32
- G02B6 02
- G02B6 42
- H01L31 0232
- H01L33 58
- H01S5 00
- H01S5 30
Designated states6
- Contracting states, 6
- Germany
- France
- United Kingdom
- Italy
- Netherlands (Kingdom of the)
- Sweden