CN1186657C - Optical fibre collimator and making method thereof - Google Patents
Optical fibre collimator and making method thereof Download PDFInfo
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- CN1186657C CN1186657C CNB021028516A CN02102851A CN1186657C CN 1186657 C CN1186657 C CN 1186657C CN B021028516 A CNB021028516 A CN B021028516A CN 02102851 A CN02102851 A CN 02102851A CN 1186657 C CN1186657 C CN 1186657C
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- graded index
- index multimode
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- multimode fiber
- optical fiber
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Abstract
The present invention relates to an optical fiber collimator which comprises a single-mode optical fiber and a graded index multimode optical fiber, which are connected with each other, wherein the graded index multimode optical fiber has preset length for providing convenience for collimating light rays. The wave form of each light ray has a cycle when the light ray is transmitted in the graded index multimode optical fiber, and the length of the graded index multimode optical fiber is actually 0.25*N*P, wherein the N is a positive odd number.
Description
Technical field
The present invention relates to a kind of collimating apparatus, particularly relate to a kind of optical fiber collimator that utilizes graded index multimode fiber to come collimated ray.
Background technology
In optical devices or optical system, collimating apparatus is an optical element commonly used.It mainly is that light signal collimation is directional light, to reduce the phenomenon of dispersing of light beam.
In the prior art, collimating apparatus is to use gradual index lens (graded-index lens, GRIN lens) changes the angle of divergence by the diverging light of single-mode fiber (single-mode fiber) incident, make it become parallel emission light, and therefore light signal is coupled to other optical element.
Yet the volume of this kind collimating apparatus is bigger, and external diameter is about 1.8mm.So it also is not suitable for the less optical devices of volume, on micro electronmechanical photoswitch (MEMS switch) or slab guide device.
Summary of the invention
At the problems referred to above, the object of the present invention is to provide a kind of optical fiber collimator and manufacture method thereof, its shared space is less, is applicable to the optical devices that volume is less.
For achieving the above object, optical fiber collimator proposed by the invention comprises a single-mode fiber and a graded index multimode fiber.Graded index multimode fiber is connected with single-mode fiber, and its length is that a predetermined length is with collimated ray.Waveform when light transmits in graded index multimode fiber has one-period P, and the length of graded index multimode fiber is essentially 0.25 * N * P, and wherein N is a positive odd number.
Graded index multimode fiber can fuse connected mode (fusion splicing) or gummed connected mode (adhesive splicing) is connected with single-mode fiber.One diaphragm can be socketed in the junction of this single-mode fiber and graded index multimode fiber, ruptures in the junction to prevent single-mode fiber and graded index multimode fiber.
With after graded index multimode fiber is connected, can change the length of graded index multimode fiber at single-mode fiber, make it be essentially 0.25 * N * P with heating and the mode that stretches.In addition, also can use the ultraviolet light irradiation graded index multimode fiber, changing its refractive index gradient, and then the cycle P when changing light and in graded index multimode fiber, transmitting.
When adjusting graded index multimode fiber, can be to graded index multimode fiber with a light beam coupling, and survey the output of single-mode fiber with a light power meter, whether adjusted finishes with the differentiation graded index multimode fiber.In addition, also can be with light beam coupling to single-mode fiber, and come the tangent plane size of detecting light beam after graded index multimode fiber output with a photoscanner, whether adjusted finishes to differentiate graded index multimode fiber.
For achieving the above object, the present invention proposes a kind of manufacture method of optical fiber collimator, it comprises: a graded index multimode fiber is connected with a single-mode fiber, and wherein this is connected to fusion connection or gummed connection.And, detect a light that passes through this graded index multimode fiber and this single-mode fiber with a photodetector, and adjust this graded index multimode fiber, and this graded index multimode fiber can be collimated by light, wherein this photodetector can be a light power meter (power meter); In addition, this photodetector also can be a photoscanner (beamscanner); This set-up procedure comprises heating and this graded index multimode fiber or with this graded index multimode fiber of ultraviolet light irradiation of stretching.
This manufacture method also comprises, can polish the end face that polishes this graded index multimode fiber; And at the junction of this graded index multimode fiber and this single-mode fiber socket one diaphragm.Further, this set-up procedure comprises: the relative position of adjusting this graded index multimode fiber and this single-mode fiber; And fix this graded index multimode fiber and this single-mode fiber with fixing glue.
Description of drawings
With reference to accompanying drawing, below will be described in detail and illustrate that advantages and features of the invention show with will be more readily apparent to foundation optical fiber collimator of the present invention and manufacture method thereof,
Accompanying drawing comprises:
Fig. 1 is a synoptic diagram, and it has shown the structure according to the optical fiber collimator of preferred embodiment of the present invention;
Fig. 2 A and Fig. 2 B are synoptic diagram, and it has shown a kind of manufacture method according to the optical fiber collimator of preferred embodiment of the present invention;
Fig. 3 A and Fig. 3 B are synoptic diagram, and it has shown the another kind of manufacture method according to the optical fiber collimator of preferred embodiment of the present invention;
Fig. 4 is a synoptic diagram, and it has shown another manufacture method according to the optical fiber collimator of preferred embodiment of the present invention; With
Fig. 5 A and Fig. 5 B are synoptic diagram, and it has shown another manufacture method according to the optical fiber collimator of preferred embodiment of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, optical fiber collimator and manufacture method thereof according to preferred embodiment of the present invention are described.Wherein identical assembly will be illustrated with identical reference numerals.
Please refer to Fig. 1, the optical fiber collimator 1 of foundation preferred embodiment of the present invention comprises: a single-mode fiber (single-mode fiber) 11 and one graded index multimode fiber (graded-index multi-mode fiber) 12.In single-mode fiber 11, light system advances in the total reflection mode.Because in the graded index multimode fiber 12, the change meeting of refractive index constantly changes direction to fiber axis, so in graded index multimode fiber 12, light can be that the waveform of P is propagated with the one-period.
In the present embodiment, the pass of the length L of graded index multimode fiber 12 and cycle P is:
L＝0.25×N×P
Wherein N is a positive odd number.If length L and cycle P meet above-mentioned relation, then light can penetrate with the directional light form in fact by behind the graded index multimode fiber 12.In addition, graded index multimode fiber 12 can for example connect (adhesive splicing) mode with fusion connection (fusion splicing) or gummed and connect in every way with single-mode fiber 11.
Following with reference to accompanying drawing, the manufacture process according to the optical fiber collimator 1 of preferred embodiment of the present invention is described.
Please refer to Fig. 2 A and Fig. 2 B, in a preferred embodiment of the present invention, a graded index multimode fiber 12 is welded together with single-mode fiber 11 earlier, and then the end face polishing of graded index multimode fiber 12 is polished.Then, light beam B is coupled into graded index multimode fiber 12, monitors the output of single-mode fibers 11 simultaneously with a light power meter (power meter) 20.Can the serve as reasons light of another collimating apparatus output of light beam B.
After light beam B was coupled into graded index multimode fiber 12, graded index multimode fiber 12 was heated to wait a moment and is stretched slowly to change length.When stretching graded index multimode fiber 12,, can learn that light is sent to the focusing situation of single-mode fiber 11 by graded index multimode fiber 12 by the output of monitoring light power meter 20.If the output result of light power meter 20 is a maximum power value, the light beam B that expression is incident to graded index multimode fiber 12 focuses to single-mode fiber fully.Promptly stop heating and stretching this moment, and rupture to prevent welding point in welding point place cover upper protective film 21 to graded index multimode fiber 12.
Embodiment 2
Please refer to Fig. 3 A and Fig. 3 B, in another embodiment of the present invention, graded index multimode fiber 12 is that elder generation and single-mode fiber 11 are welded together, and then the end face polishing of graded index multimode fiber 12 is polished.Then, light beam B is coupled into single-mode fiber 11, exports the tangent plane size of light simultaneously with a photoscanner 30 (beam scanner) monitoring graded index multimode fiber 12.
At this moment, heating graded index multimode fiber 12, and the graded index multimode fiber 12 that slowly stretches is to change its length.When stretching,, whether be essentially directional light in the time of can learning light by graded index multimode fiber 12 outputs by the optical section size that monitoring photoscanner 30 is detected.If the output result of photoscanner 30 demonstration is essentially directional light by the output light of graded index multimode fiber 12, then stops graded index multimode fiber 12 heating and stretching, and rupture to prevent contact in welding point cover upper protective film 21.
Embodiment 3
Please refer to Fig. 4, in another embodiment of the present invention, the length of graded index multimode fiber 12 is calculated in advance, approximates 0.25 * N * P, and wherein N is a positive odd number, the cycle of the waveform that P then advances in graded index multimode fiber 12 for light.Polished the polishing of one end of single-mode fiber 11, the other end then are coupled with a light source, make light beam B enter single-mode fiber 11.
Then, adjust the relative position of single-mode fiber 11 and graded index multimode fiber 12, and export the tangent plane size of light with photoscanner 30 monitoring graded index multimode fibers 12.When the output result of photoscanner 30 shows that output light by graded index multimode fiber 12 is essentially directional light, promptly add fixing glue, to fix its relative position in the junction of single-mode fiber 11 and graded index multimode fiber 12.
It should be noted that, graded index multimode fiber can adopt a ultraviolet ray induction graded index multimode fiber (UV sensitivity Graded-index Multimode Fiber), and change its refractive index gradient in the mode of irradiation ultraviolet radiation, to change cycle P.For example, please refer to Fig. 5 A and Fig. 5 B, after graded index multimode fiber 12 and single-mode fiber 11 weldings, graded index multimode fiber 12 can be accepted ultraviolet irradiation changing its refractive index gradient, and then changes the cycle P of light waveform.So, when the output result of photoscanner 30 shows that output light by graded index multimode fiber 12 is directional light, then stop graded index multimode fiber 12 irradiation ultraviolet radiations, and rupture to prevent contact in welding point cover upper protective film 21.
Because optical fiber collimator proposed by the invention is to replace the bigger gradual index lens of volume (the about 1.8mm of external diameter) with the less graded index multimode fiber of volume (the about 0.125mm of external diameter), so can reduce the volume of collimating apparatus effectively.When the less optical devices of utilization volume, optical fiber collimator proposed by the invention can reduce effectively because of the excessive problem that occurs of collimating apparatus volume.
Therefore, the above only is explanation preferred embodiment of the present invention, and it does not have restrictive effect.Anyly do not break away from spirit of the present invention and category and, all should be regarded as being included within the application's the claim scope its equivalent modifications of carrying out.
Claims (10)
1. optical fiber collimator, it comprises:
One is used for the single-mode fiber of transmission ray; And
One graded index multimode fiber;
It is characterized in that, this graded index multimode fiber engages earlier with this single-mode fiber, and this graded index multimode fiber is after engaging, this graded index multimode fiber is applied a thermal treatment, the length that makes this graded index multimode fiber is 0.25 * N * P, to collimate this light, wherein N is a positive odd number, and P is the wave period of this light when transmitting in this graded index multimode fiber.
2. optical fiber collimator as claimed in claim 1 is characterized in that, this graded index multimode fiber is connected with this single-mode fiber with the fusion juncture or with the gummed juncture.
3. optical fiber collimator as claimed in claim 1 is characterized in that it also comprises:
One diaphragm, it is socketed on the joint of this single-mode fiber and this graded index multimode fiber.
4. the manufacture method of an optical fiber collimator is characterized in that:
Connect a graded index multimode fiber and a single-mode fiber earlier, detect a light that passes through this graded index multimode fiber and this single-mode fiber with a photodetector again, and this graded index multimode fiber applied a thermal treatment, the length that makes this graded index multimode fiber is 0.25 * N * P, pass through this light with collimation, wherein N is a positive odd number, and P is the wave period of this light when transmitting in this graded index multimode fiber.
5. the manufacture method of optical fiber collimator as claimed in claim 4 is characterized in that, this is connected to, and fusion connects or gummed connects.
6. the manufacture method of optical fiber collimator as claimed in claim 4 is characterized in that, this photodetector is a light power meter.
7. the manufacture method of optical fiber collimator as claimed in claim 4 is characterized in that, this photodetector is a photoscanner.
8. the manufacture method of optical fiber collimator as claimed in claim 4 is characterized in that, can also use the method for this graded index multimode fiber of ultraviolet light irradiation in this heat treatment step.
9. the manufacture method of optical fiber collimator as claimed in claim 4 is characterized in that, it more comprises:
Polishing polishes the end face of this graded index multimode fiber.
10. the manufacture method of optical fiber collimator as claimed in claim 4 is characterized in that, more comprises:
At the junction of this graded index multimode fiber and this single-mode fiber socket one diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021028516A CN1186657C (en) | 2002-01-25 | 2002-01-25 | Optical fibre collimator and making method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021028516A CN1186657C (en) | 2002-01-25 | 2002-01-25 | Optical fibre collimator and making method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1434340A CN1434340A (en) | 2003-08-06 |
| CN1186657C true CN1186657C (en) | 2005-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021028516A Expired - Fee Related CN1186657C (en) | 2002-01-25 | 2002-01-25 | Optical fibre collimator and making method thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7190864B2 (en) * | 2004-04-02 | 2007-03-13 | Beamtek, Inc. | Fiber collimating lenses and method |
| CN103235389B (en) * | 2013-05-02 | 2015-02-11 | 哈尔滨理工大学 | Optical fiber coupling-based optical fiber rotating collimator and coaxial debugging method for mechanical axis and optical axis of optical fiber rotating collimator |
| CN103267497B (en) * | 2013-05-23 | 2015-12-02 | 哈尔滨理工大学 | Based on the fiber spinning collimating apparatus mechanical axis of coupling fiber and the measuring method of optical axis included angle |
| EP3026484A4 (en) * | 2013-07-26 | 2016-10-26 | Citizen Holdings Co Ltd | Light source device and projection device |
| CN105759372B (en) * | 2016-04-27 | 2018-05-22 | 武汉电信器件有限公司 | A kind of optical lens component and its method |
| CN107561160B (en) * | 2017-08-31 | 2020-04-07 | 西北大学 | High signal-to-noise ratio optical fiber ultrasonic sensor based on polytetrafluoroethylene film |
| CN111653659B (en) * | 2020-07-16 | 2021-05-18 | 湖北大学 | Device for reducing divergence angle of light emitted by light emitting diode and manufacturing method thereof |
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2002
- 2002-01-25 CN CNB021028516A patent/CN1186657C/en not_active Expired - Fee Related
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| CN1434340A (en) | 2003-08-06 |
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