CN207408624U - A kind of mixed type fiber coupler - Google Patents
A kind of mixed type fiber coupler Download PDFInfo
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- CN207408624U CN207408624U CN201721435238.2U CN201721435238U CN207408624U CN 207408624 U CN207408624 U CN 207408624U CN 201721435238 U CN201721435238 U CN 201721435238U CN 207408624 U CN207408624 U CN 207408624U
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Abstract
The utility model is suitable for technical field of optical fiber, provide a kind of mixed type fiber coupler, importing single mode optical fiber, coreless fiber, hollow glass tube and export single mode optical fiber including welding in order, the importing single mode optical fiber and the export single mode optical fiber include fibre core and covering, and single mode optical fiber and the fibre core for importing single mode optical fiber of importing be not or not same level direction；Being inscribed in the coreless fiber and the hollow glass tube has a curvilinear waveguides, and the fibre core of the importing single mode optical fiber and the export single mode optical fiber is connected with the curvilinear waveguides；The both sides of the hollow glass tube respectively have a microchannel, two microchannels and the microchannel that is centrally formed of the hollow glass tube, and the microchannel is used to pass in and out the hollow glass tube for analysis liquid.The mixed type fiber coupler that the utility model embodiment provides simplifies the structure of device, making material is cheap, it is simple in structure, facilitate making.
Description
Technical field
The utility model belongs to technical field of optical fiber more particularly to a kind of mixed type fiber coupler.
Background technology
In the prior art, refractometry mainly is carried out to analysis liquid by the following method：
1st, photonic crystal fiber method is filled：It is selective at one according to the natural air pore structure of photonic crystal fiber
Or with the liquid waveguide after filling directional couple can occur for Filling Analysi liquid in multiple airports, the optical signal in fiber core.
The disadvantages of this method is that the liquid waveguide after Filling Analysi liquid is closing, it is impossible to realize the dynamic measurement of external environment liquid.
2nd, special light nanofarads are drawn：The method devises a kind of special construction optical fiber with air duct, and passage is parallel
In shaft axis of optic fibre, and in its interior Filling Analysi liquid, the liquid waveguide of directional couple can occur with fiber core for formation.This method
Shortcoming is that used optical fiber is not Commercial fibers, it is necessary to design customized, and cost makes high.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of mixed type fiber couplers, it is intended to solve existing
When the refractive index measurement of analysis liquid is carried out in technology, it is impossible to realize the dynamic measurement of external environment liquid, optical fiber fabrication is of high cost
The problem of.
The utility model is realized in this way a kind of mixed type fiber coupler, the importing single mode including welding in order
Optical fiber, coreless fiber, hollow glass tube and export single mode optical fiber, the importing single mode optical fiber and the export single mode optical fiber wrap
Fibre core and covering are included, single mode optical fiber and the fibre core for importing single mode optical fiber of importing be not or not same level direction；
Being inscribed in the coreless fiber and the hollow glass tube has a curvilinear waveguides, the importing single mode optical fiber and institute
The fibre core for stating export single mode optical fiber is connected with the curvilinear waveguides；
The both sides of the hollow glass tube respectively have a microchannel, two microchannels and the hollow glass tube
Microchannel is centrally formed, the microchannel is used to pass in and out the hollow glass tube for analysis liquid.
Further, the curvilinear waveguides include curved waveguide and straight waveguide, wherein：
The curved waveguide is located in the coreless fiber, and the straight waveguide is located in the hollow glass tube, and institute
State central axes of the straight waveguide parallel to the hollow glass tube.
Compared with prior art, advantageous effect is the utility model：The hybrid optical that the utility model embodiment provides
Fine coupler includes importing single mode optical fiber, coreless fiber, hollow glass tube and export single mode optical fiber, coreless fiber and hollow glass
Being inscribed in pipe has a curvilinear waveguides, and the fibre core for importing single mode optical fiber and export single mode optical fiber is connected with curvilinear waveguides, the sky
The both sides of heart glass tube respectively have a microchannel, and two microchannels are centrally formed microchannel with the hollow glass tube, should
Microchannel is used to pass in and out the hollow glass tube for analysis liquid.The mixed type fiber coupler letter that the utility model embodiment provides
The structure of device is changed, analysis liquid passes in and out the liquid for being formed inside hollow glass tube and being coupled with solid guide by microchannel
State waveguide measures the dynamic for analyzing liquid refractive index to realize by monitoring the drift at Hybrid waveguide coupled resonance peak, simultaneously
The utility model embodiment provide mixed type fiber coupler making material it is cheap, it is simple in structure, facilitate making.
Description of the drawings
Fig. 1 is a kind of structure diagram for mixed type fiber coupler that the utility model embodiment provides；
Fig. 2 is the sectional view for importing single mode optical fiber and importing single mode optical fiber that the utility model embodiment provides；
Fig. 3 is the structure diagram for the microchannel that the utility model embodiment provides；
Fig. 4 a to Fig. 4 f are a kind of production process figures for mixed type fiber coupler that the utility model embodiment provides；
Fig. 5 is that the analysis liquid that the utility model embodiment provides enters transmission spectrum before and after mixed type fiber coupler；
Fig. 6 is the response diagram for the mixed type fiber coupler refractive index that the utility model embodiment provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 shows a kind of mixed type fiber coupler that the utility model embodiment provides, including welding in order
Single mode optical fiber 101, coreless fiber 102, hollow glass tube 103 and export single mode optical fiber 104 are imported, imports 101 He of single mode optical fiber
Exporting single mode optical fiber 104 includes fibre core and covering, imports single mode optical fiber 101 and imports the fibre core of single mode optical fiber 104 not same
One horizontal direction；
Being inscribed in coreless fiber 102 and hollow glass tube 103 has a curvilinear waveguides, imports single mode optical fiber 101 and export
The fibre core of single mode optical fiber 104 is connected with the curvilinear waveguides；The both sides of hollow glass tube 103 respectively have a microchannel, two
Zhi Suoshu microchannels and the microchannel that is centrally formed of hollow glass tube 103, the microchannel are used for empty for analysis liquid disengaging
Heart glass tube 103.
Fibre core 201 and covering 202, centreless are provided with as shown in Fig. 2, importing single mode optical fiber 101 and exporting single mode optical fiber 104
The curvilinear waveguides inscribed in optical fiber 102 and hollow glass tube 103 are respectively with importing single mode optical fiber 101 and export single mode optical fiber 104
Fibre core be connected, i.e., curvilinear waveguides coincide with fibre core.
As shown in figure 3, the both sides of hollow glass tube 103 respectively have a microchannel and microchannel 301 and 302, two
Microchannel and the center 303 of the hollow glass tube form microchannel, and the microchannel is used for for described in analysis liquid disengaging
Hollow glass tube.
The production process for the mixed type fiber coupler that the utility model embodiment provides is as shown in Figure 4.Single mode in Fig. 4
Optical fiber forms total reflection condition by fibre core and covering so that light with low-loss can be transmitted in fibre core middle and long distance；Femtosecond laser
The increased fiber waveguide of local indexes of refraction is generated with coreless fiber and hollow glass tube effect, to conduct light energy；Utilize femtosecond
Laser goes out two microchannels in the ablation of hollow glass tube side, is centrally formed U-shaped miniflow access with hollow glass tube, conveniently treats
The inside of analysis liquid disengaging hollow glass tube is surveyed, forms liquid waveguide.Curved waveguide imports single mode optical fiber and hollow for connecting
Straight waveguide in glass tube；Straight waveguide is used to that orientation coupling to occur with the liquid waveguide formed after filling inside hollow glass tube
It closes；Straight waveguide is used for connecting curved waveguide and export single mode optical fiber.In practical applications, import the fibre core of single mode optical fiber, lead
Fibre core, coreless fiber and the hollow glass tube for going out single mode optical fiber are made of quartz material, different according to actual needs, quartz
The purity of material is also different.
Five steps below the preparation method for the mixed type fiber coupler that the utility model embodiment provides：
First, one end welding of single mode optical fiber and coreless fiber will be imported using optical fiber splicer, is existed using optical fiber cutter
Position away from fusion point certain distance cuts off coreless fiber, as shown in fig. 4 a.
2nd, using optical fiber splicer by one end welding of coreless fiber and hollow glass tube, using optical fiber cutter away from
The position of fusion point certain distance cuts off hollow glass tube, as shown in Figure 4 b.
3rd, single mode optical fiber dislocation welding by hollow glass tube and is exported using optical fiber splicer, as illustrated in fig. 4 c.Specifically
Ground, hollow glass tube have with the magnitude of misalignment for exporting single mode optical fiber with the straight waveguide in the curvilinear waveguides inscribed in next step
It closes, the purpose of dislocation welding is to be able to that the fibre core of export single mode optical fiber is made to overlap with straight waveguide.
4th, a curvilinear waveguides are inscribed in coreless fiber and hollow glass tube using femtosecond laser, the curvilinear waveguides bag
Curved waveguide and straight waveguide are included, wherein curved waveguide is located at coreless fiber, and straight waveguide is located in hollow glass tube, straight wave
Lead the central axes parallel to hollow glass tube, and spacing is H, the coupling efficiency between spacing H and straight waveguide and liquid waveguide
Correlation, the both ends for the curvilinear waveguides that femtosecond laser is inscribed overlap respectively with importing single mode optical fiber and exporting the fibre core of single mode optical fiber,
As shown in figure 4d；
5th, two microchannels are processed in the side of hollow glass tube using femtosecond laser, makes it tubular with hollow glass
Into U-shaped microchannel, hollow glass tube is passed in and out for analysis liquid, as shown in fig 4e；
During specifically used, optical signals import Single-Mode Fiber Coupling to the curvilinear waveguides inscribed, through curved waveguide
Be transmitted to after linear pattern waveguide export single mode optical fiber fibre core in；According to coupled mode theory, when phase-matching condition meets,
Directional couple can occur for two neighbouring parallel waveguides, and due to the difference of dispersion curve, liquid waveguide and solid waveguide only can be
Resonance occurs in one wavelength range, when the straight waveguide transmission that optical signal is inscribed in hollow glass tube, some light
Liquid waveguide can be coupled to, and is lost in the form of cladding mode, finally in the spectrum of the fibre core output of export single mode optical fiber
Generate a unique resonance loss peak.When the refractive index for analyzing liquid changes, coupling summit is drifted about therewith, is demarcated
Refractive index realizes the dynamic measurement of analysis liquid refractive index, as shown in fig. 4f with coupling the correspondence between peak.
The preparation process of the Combination fiber coupler provided below by one the utility model embodiment and make
With further being illustrated：
First, using optical fiber splicer and optical fiber cutter according to certain one general single mode light of size and sequentially built
Fine -- the device that coreless fiber -- hollow glass tube -- general single mode fiber is connected with each other.Wherein, the length of coreless fiber is
2mm, the outer diameter and internal diameter of hollow glass tube are respectively the dislocation welding of 125 μm and 5 μm, hollow glass tube and general single mode fiber
Offset is 15 μm.
Then, one curved waveguide of system and one section of straight wave are write with femto-second laser in coreless fiber and hollow glass tube
Lead, two radius of curvature of curved waveguide are 50mm, straight waveguide parallel to hollow glass tube axle center and away from its central axes
15 μm, make the central axial alignment of the central shaft and export single mode optical fiber of straight waveguide, make when making curved waveguide and straight waveguide
The numerical aperture of immersion oil object lens is 1.25, femtosecond laser output wavelength 532nm, output pulse width 250fs, pulse recurrence frequency
For 200kHZ, the energy of single laser pulse is 250nJ, and the translational speed of sample optical fiber is 200 μm/s, and the sample optical fiber is successively
Welding imports the sample for not writing waveguide obtained after single mode optical fiber, wireless optical fiber, hollow glass tube and export single mode optical fiber.Most
Afterwards, go out two micro- accesses in the side ablation of hollow glass tube with femtosecond laser, make it U-shaped with being centrally formed for hollow glass tube
Microchannel facilitates analysis liquid to be measured to pass in and out the inside of hollow glass tube.The spectrum of obtained optical fibre device is as shown in figure 5, reality
Line and chain-dotted line are to analyze liquid to enter the curve of spectrum before and after hollow glass tube respectively.Refractive index be 1.465876 analysis liquid into
Enter microchannel and form liquid waveguide.
As shown in figure 5, solid waveguide meets phase-matching condition with liquid waveguide near 1550nm, in solid waveguide
The optical signal of middle transmission can be coupled in liquid waveguide, so generating a special loss peak in transmission spectrum.When
When the refractive index of analysis liquid to be measured increases, the curve of spectrum drifts about toward shortwave direction, as shown in Figure 6.Therefore, this practicality
The mixed type coupler that new embodiment provides can be used for measuring the refractive index of external environment.
A kind of Hybrid waveguide coupler for surveying refractive index and prior art phase that the utility model embodiment provides
Than the advantages of Hybrid waveguide coupler is most prominent is a simplified the structure of device, and it is empty that analysis liquid passes through microchannel disengaging
The liquid waveguide that the formation of heart glass tube is coupled with solid guide, by the drift for monitoring Hybrid waveguide coupled resonance peak
In-migration, which is realized, measures the dynamic for analyzing liquid refractive index, while the utility model embodiment provides Hybrid waveguide coupler and makes
Material is cheap, it is simple in structure, facilitate making.
The utility model embodiment is applied and following fields：
(1) highly sensitive index sensor：It analyzes liquid and can be passed in and out by microchannel and formed inside hollow glass tube and solid
The liquid waveguide that state waveguide couples reflects analysis liquid to realize by monitoring the drift at Hybrid waveguide coupled resonance peak
The dynamic measurement of rate；
(2) high-sensitivity temperature sensor：The higher liquid of thermo-optical coeffecient is filled in hollow glass tube and forms liquid ripple
It leads, the stabilization that uv-curable glue ensures liquid waveguide is filled in micro- access of laser ablation.The refractive index of liquid waveguide can be with
The variation of temperature and change, by monitor coupling peak drift, realize the real-time measurement of temperature；
(3) elongation strain sensor：When optical fibre device is subject to longitudinal stretching, the liquid waveguide index in hollow glass tube
It is constant, and inscribe waveguide index and change because generating elasto-optical effect, by monitoring the drift at coupling peak, realize elongation strain
Measurement.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (2)
1. a kind of mixed type fiber coupler, which is characterized in that importing single mode optical fiber, coreless fiber including welding in order,
Hollow glass tube and export single mode optical fiber, the importing single mode optical fiber and the export single mode optical fiber include fibre core and covering,
Single mode optical fiber and the fibre core for importing single mode optical fiber of importing be not or not same level direction；
Being inscribed in the coreless fiber and the hollow glass tube has a curvilinear waveguides, the importing single mode optical fiber and described leads
The fibre core for going out single mode optical fiber is connected with the curvilinear waveguides；
The both sides of the hollow glass tube respectively have a microchannel, two microchannels and the center of the hollow glass tube
Microchannel is formed, the microchannel is used to pass in and out the hollow glass tube for analysis liquid.
2. mixed type fiber coupler as described in claim 1, which is characterized in that the curvilinear waveguides include curved waveguide and
Straight waveguide, wherein：
The curved waveguide is located in the coreless fiber, and the straight waveguide is located in the hollow glass tube, and described straight
Line waveguide is parallel to the central axes of the hollow glass tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721435238.2U CN207408624U (en) | 2017-10-31 | 2017-10-31 | A kind of mixed type fiber coupler |
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| CN201721435238.2U CN207408624U (en) | 2017-10-31 | 2017-10-31 | A kind of mixed type fiber coupler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608030A (en) * | 2017-10-31 | 2018-01-19 | 深圳大学 | A kind of mixed type fiber coupler and preparation method thereof |
| CN109211839A (en) * | 2018-09-01 | 2019-01-15 | 哈尔滨工程大学 | A kind of binary channels side-hole fiber grating sensing device |
| CN110470240A (en) * | 2019-08-16 | 2019-11-19 | 天津大学 | A kind of optical fiber curvature measurement sensor and preparation method thereof, measuring system |
-
2017
- 2017-10-31 CN CN201721435238.2U patent/CN207408624U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608030A (en) * | 2017-10-31 | 2018-01-19 | 深圳大学 | A kind of mixed type fiber coupler and preparation method thereof |
| CN107608030B (en) * | 2017-10-31 | 2023-08-15 | 深圳大学 | Hybrid optical fiber coupler and preparation method thereof |
| CN109211839A (en) * | 2018-09-01 | 2019-01-15 | 哈尔滨工程大学 | A kind of binary channels side-hole fiber grating sensing device |
| CN109211839B (en) * | 2018-09-01 | 2021-01-12 | 哈尔滨工程大学 | Double-channel side hole fiber grating sensing device |
| CN110470240A (en) * | 2019-08-16 | 2019-11-19 | 天津大学 | A kind of optical fiber curvature measurement sensor and preparation method thereof, measuring system |
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