CN101770053A - Optical fiber bidirectional coupler - Google Patents
Optical fiber bidirectional coupler Download PDFInfo
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- CN101770053A CN101770053A CN200810242135A CN200810242135A CN101770053A CN 101770053 A CN101770053 A CN 101770053A CN 200810242135 A CN200810242135 A CN 200810242135A CN 200810242135 A CN200810242135 A CN 200810242135A CN 101770053 A CN101770053 A CN 101770053A
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Abstract
The invention discloses a plastic optical fiber bidirectional coupler, which is specially designed for a plastic optical fiber bidirectional transmission system and has high coupling efficiency and good directivity. The optical fiber bidirectional coupler consists of a small-core-diameter optical fiber and a large-core-diameter optical fiber, wherein the large-core-diameter optical fiber is a plastic optical fiber with the diameter four times equal to or more than the diameter of the small-core-diameter optical fiber, the surface of the large-core-diameter optical fiber is engraved with a micro groove with the width slightly more than the diameter of the small-core-diameter optical fiber, the radial normal section of the groove is of a right-angled triangle shape, the axial straight-edged surface of the groove is a coupling surface of the groove, the radial straight-edged surface of the groove is a positioning surface of the groove, the small-core-diameter optical fiber is bonded with the large-core-diameter optical fiber in the groove, wherein the terminal surface of the small-core-diameter optical fiber is aligned with the coupling surface of the groove, and the body of the small-core-diameter optical fiber closely clings to the positioning surface of the groove. The invention overcomes the defects of the traditional plastic optical fiber coupler such as high insertion loss and low directivity, and has significant performance advantages.
Description
Technical field
A kind of optical fiber bidirectional coupler involved in the present invention is specially adapted to the optical fiber bidirectional coupler that the plastic optical fiber bidirectional transmission system is used, and also can be used for the bidirectional coupler of plastic optical fiber sensor (as the optical fibre refractivity meter).
Background technology
Plastic optical fiber is as a kind of low cost, and the transmission medium of high bandwidth is considered to be in following glass optical fiber and the ideal medium of copper cabling in short distance communication is used of replacing.The use of plastic optical fiber must relate to plastic optical fibre coupler and be used for beam split or close light making up the plastic optical fiber network system, and wherein the plastic optical fiber bidirectional transmission system is considered to a kind of very promising transmission system.It uses a plastic optical fiber to replace the common method of using two plastic optical fibers in the point-to-point transmission, has saved the cost of an optical fiber, is considered to have very much the transmission system of cost advantage.
The conventional plastic fiber coupler has the fused biconical taper method, injection moulding, optical fiber connector polishing method, optical fiber surface ultrasonic bonding.The prepared fiber coupler of this several method has the high shortcomings such as loss and low directivity of inserting.Because the high relatively decay of plastic optical fiber itself, these coupling mechanisms can not satisfy the power budget of bidirectional transmission system.
Summary of the invention
At the deficiencies in the prior art, the present invention aims to provide a kind of plastic optical fiber bidirectional coupler, at the design of plastic optical fiber bidirectional transmission system, it has very high coupling efficiency and good directivity specially, to solve the high shortcoming of inserting loss and low directivity in the conventional plastic fiber coupler.
For achieving the above object, a kind of optical fiber bidirectional coupler of the present invention, form by a little core optical fibers and a large core fiber, described large core fiber is the plastic optical fiber that diameter is not less than four times of little core optical fibers diameters, the micro-recesses that width is slightly larger than little core optical fibers diameter is carved with on its surface, the radially normal section of described groove is shaped as the right angle trigonometry type, the coupling surface that its axial straight flange face is a groove, its radially the straight flange face be the locating surface of groove, little core optical fibers is adhered to large core fiber in groove, wherein, the terminal surface of little core optical fibers aligns with the coupling surface of groove, and the locating surface of its fine body and groove is close to.
Described little core optical fibers is to plant single mode or multimode glass fiber arbitrarily, also can be plastic optical fiber.
As improvement, little core optical fibers is adhered in the groove of large core fiber mutually by refractive index match glue or resin.
The present invention compares with prior art, and have following giving prominence to and outstanding feature: this direction coupling mechanism uses glass optical fiber and two kinds of optical fiber of plastic optical fiber to constitute hybridization type fiber coupler first.This direction coupling mechanism uses side-coupled method.The coupling loss of this direction coupling mechanism on both direction breaks through 3 decibels of limit of traditional fiber coupling mechanism all less than 2 decibels.In theory, the directivity of this direction coupling mechanism is greater than 60 decibels, and the conventional plastic fiber coupler directivity be no more than 30 decibels.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the vertical view of the embodiment of the invention.
Wherein, 1 is that little core optical fibers, 2 is the coupling surface of groove for the locating surface of groove, 5 for groove, 4 for large core fiber, 3.
Embodiment
By Fig. 1 and Fig. 2 as can be seen, plastic optical fiber bidirectional coupler of the present invention, it is made up of little core optical fibers 1 and large core fiber 2.Be carved with micro-recesses 3 on the big core diameter plastic optical fiber 2, little core optical fibers 1 be positioned in the micro-recesses 3 and with large core fiber 2 usefulness resins or gluing being connected together.2 one-tenth one coupling angles of little core optical fibers 1 and large core fiber.Choosing of coupling angle in order to satisfy the maximum coupling efficiency of little core optical fibers to large core fiber.Micro-recesses 3 be designed and sized to slightly greater than the height of the yardstick of little core optical fibers and micro-recesses try one's best little, to satisfy the maximum coupling efficiency of plastic optical fiber interior lights.Coupling efficiency on both direction can both reach maximal value like this.And because the place that is coupling in unique reflection on the direction from little core optical fibers to plastic optical fiber of light is the coupling surface 5 of groove, its reflected light is along the direction of little core optical fibers, so reflex in the plastic optical fiber light seldom, thereby can realize the high directivity of coupling mechanism.
As one of the specific embodiment of the present invention, little core optical fibers 1 is the progressive refractive index glass optical fiber of multimode, and the light nuclear diameter is 65um, and fibre diameter is 125um, and large core fiber 2 is a multimode saltant refractive index PMMA plastic optical fiber, and fibre diameter is 1mm.Groove height is 150um, and width is 140um, and physical size can be carried out actual choosing according to actual conditions.The optical fiber coupling angle is 15 degree.Glass optical fiber is positioned in the groove, and fiber end face aligns with coupling surface and leaves the 3-5um slit, and optical fiber itself aligns with locating surface, and between the distance greater than 3um.In groove, add glue or the resin that mates with the plastic optical fiber fiber core refractive index, solidify through UV-irradiation or other method.So two-way plastic optical fibre coupler of high-performance has just been made.
Claims (4)
1. optical fiber bidirectional coupler, form by a little core optical fibers (1) and a large core fiber (2), it is characterized in that: the plastic optical fiber of described large core fiber (2) four times of little core optical fibers (1) diameters for diameter is not less than, the micro-recesses (3) that width is slightly larger than little core optical fibers (1) diameter is carved with on its surface, the radially normal section of described groove (3) is shaped as the right angle trigonometry type, the coupling surface (5) that its axial straight flange face is a groove, its radially the straight flange face be the locating surface (4) of groove, little core optical fibers (1) is adhered to large core fiber (2) in groove (3), wherein, the terminal surface of little core optical fibers (1) aligns with the coupling surface (5) of groove, and the locating surface (4) of its fine body and groove is close to.
2. coupling mechanism according to claim 1 is characterized in that: described little core optical fibers is to plant single mode or multimode glass fiber arbitrarily.
3. coupling mechanism according to claim 1 is characterized in that: described little core optical fibers is a plastic optical fiber.
4. according to each described coupling mechanism in the claim 1 to 3, it is characterized in that: little core optical fibers (1) is adhered in the groove (3) of large core fiber (2) mutually by refractive index match glue or resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810242135A CN101770053A (en) | 2008-12-31 | 2008-12-31 | Optical fiber bidirectional coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810242135A CN101770053A (en) | 2008-12-31 | 2008-12-31 | Optical fiber bidirectional coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101770053A true CN101770053A (en) | 2010-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810242135A Pending CN101770053A (en) | 2008-12-31 | 2008-12-31 | Optical fiber bidirectional coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101770053A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015081759A1 (en) * | 2013-12-03 | 2015-06-11 | 方笑尘 | A high-power optical fiber power combiner |
| CN106918873A (en) * | 2017-03-13 | 2017-07-04 | 讯达康通讯设备(惠州)有限公司 | A kind of integral type multi-core fiber coupling connecting device |
-
2008
- 2008-12-31 CN CN200810242135A patent/CN101770053A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015081759A1 (en) * | 2013-12-03 | 2015-06-11 | 方笑尘 | A high-power optical fiber power combiner |
| CN106918873A (en) * | 2017-03-13 | 2017-07-04 | 讯达康通讯设备(惠州)有限公司 | A kind of integral type multi-core fiber coupling connecting device |
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Application publication date: 20100707 |