CN209327614U - Tunable filter - Google Patents
Tunable filter Download PDFInfo
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- CN209327614U CN209327614U CN201822197110.8U CN201822197110U CN209327614U CN 209327614 U CN209327614 U CN 209327614U CN 201822197110 U CN201822197110 U CN 201822197110U CN 209327614 U CN209327614 U CN 209327614U
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- fixing piece
- hole
- installation
- fiber stub
- optical path
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Abstract
The utility model provides a kind of tunable filter, including two fixing pieces, two optical fiber connectors and piezoelectric ceramics, fixing piece is provided through installation through-hole along optical path direction, the fibre core of optical fiber connector passes through connection shell along optical path direction and protrudes into fiber stub, the fiber stub of another optical fiber connector passes through connection ring, connection ring is threadedly coupled with installation through-hole, piezoelectric ceramics is provided through receiving opening along optical path direction, piezoelectric ceramics along optical path direction is connected between fixing piece, installation through-hole and receiving opening are sequentially communicated, the exit end of two fiber stubs is positioned opposite in receiving opening.And utilize the piezoelectric effect characteristic of piezoelectric ceramics, realize accurate adjusting subtle to the distance between fixing piece, in addition fiber stub spacing can also be adjusted by the way that the optical path direction of connection ring is mobile, to realize a wide range of adjusting and subtle accurate adjusting of the exit end spacing of fiber stub, keep the filtering adjustable extent of filter big and accurate height.
Description
Technical field
The utility model relates to optical filter field more particularly to a kind of tunable filters.
Background technique
With the development and maturation of fiber grating sensing technology, wavelength interrogation technique is had been to be concerned by more and more people and again
Depending on.Wavelength demodulation system based on tunable optical fiber FP filter has the advantages that at low cost, response is fast, high resolution,
It is widely used.And core devices of the tunable optical fiber FP filter as whole system, performance superiority and inferiority very great Cheng
The performance of entire demodulating system is determined on degree.In optical communication system, tunable FP filter is mainly used for wavelength-division multiplex
Demultiplexing and signal demodulation etc., filter oneself become mainstream device.In addition, FP device also acts as the signal in fiber amplifier
Filter also has important application in optical fiber laser and spectrum analysis.With other kinds of adjustable light wave-filter-sound
Optical filter, Mach-Zenhder filter, distributed feed-back cloth loudspeaker lattice laser tunable optic filter are compared, tunable FP filtering
Utensil has many advantages, and if insertion loss is low, tuned speed is fast, tunable range is wide, fineness is high and flexible structure, can make
At different structure to meet the needs of different free spectral ranges.
There is also many problems and shortcomings in the practical application of tunable optical fiber FP filter, as vulnerable to temperature change
It influences, 1 degree Celsius of variation of ambient temperature, often causes the variation of at least several nanometers of optical fiber FP filter wavelength.The prior art
Middle scheme is to realize temperature control using a sealing space installation refrigerator or thermostat, certainly will increase structure in this way
Complexity, it is difficult to realize small-sized encapsulated.
Utility model content
Simple and frequency domain stable regulation the tunable filter the purpose of the utility model is to provide a kind of structure.
In order to realize the purpose of this utility model, the utility model provide a kind of tunable filter include the first fixing piece,
First optical fiber connector, the second fixing piece, the second optical fiber connector and piezoelectric ceramics, the first fixing piece runs through along optical path direction to be set
It is equipped with the first installation through-hole, the first optical fiber connector includes connection shell, the first fibre core and the first fiber stub, and the first optical fiber is inserted
Core is fixed on connection shell, and the first fibre core passes through connection shell along optical path direction and protrudes into the first fiber stub, even
Body contact body is fixedly mounted in the first installation through-hole, and the second fixing piece is provided through the second installation through-hole along optical path direction, and second
Optical fiber connector includes connection ring, the second fibre core and the second fiber stub, and the second fiber stub passes through connection ring and and connection ring
It is fixedly connected, the second fibre core stretches in the second fiber stub along optical path direction, and connection ring is mounted on the second peace with being threadedly engaged
It fills in through-hole, connection ring can move in the second installation through-hole, and piezoelectric ceramics is arranged in a ring, and piezoelectric ceramics is passed through along optical path direction
It wears and is equipped with receiving opening, piezoelectric ceramics along optical path direction is connected between the first fixing piece and the second fixing piece, the first peace
Dress through-hole, receiving opening and the second installation through-hole are sequentially communicated, and the exit end of the first fiber stub and the second fiber stub go out
It is positioned opposite in receiving opening to penetrate end.
By above scheme as it can be seen that by the way that piezoelectric ceramics is connected between fixing piece, and by the outgoing of the first fiber stub
The exit end of end and the second fiber stub is positioned opposite in receiving opening, then forms F-P resonant cavity, and piezoelectricity is utilized to make pottery
The piezoelectric effect characteristic of porcelain realizes accurate adjusting subtle to the distance between fixing piece, in addition can also pass through the light of connection ring
Road direction is mobile to adjust fiber stub spacing, to realize a wide range of adjusting and subtle essence of the exit end spacing of fiber stub
It really adjusts, using accurate adjustable frequency domain, keeps the filtering adjustable extent of filter big and accurate high.
Further scheme is that the first fixing piece is provided with the first bulge loop in the first end face towards the second fixing piece,
The first end of piezoelectric ceramics is connect with the first end face of the first fixing piece, and the first bulge loop protrudes into receiving opening.
Further scheme is that the second fixing piece is provided with the second bulge loop in the second end face towards the first fixing piece,
The second end of piezoelectric ceramics is connect with the second end face of the second fixing piece, and the second bulge loop protrudes into receiving opening.
Further scheme is the inner wall clearance fit of the first bulge loop and receiving opening.
Further scheme is the inner wall clearance fit of the second bulge loop and receiving opening.
Therefore the limit of piezoelectric ceramics is fixedly mounted by bulge loop, in piezoelectric ceramics deformation, the shifting of fixing piece
Dynamic is coaxially to be axially moveable, and then guarantees the concentricity of filter device.
Further scheme is that the first installation through-hole is provided with the first convex edge radially inwards, and the first optical fiber is inserted
Core passes through the first convex edge.
Further scheme is that the second installation through-hole is provided with the second convex edge radially inwards, and the second optical fiber is inserted
Core passes through the second convex edge.
Therefore by convex along the positioning to fiber stub, then guarantee that fiber stub is coaxial when opposite
Degree lowers light loss.
Further scheme is that the hole wall of the second installation through-hole is provided with internal screw thread, and the outer surface of connection ring is provided with
External screw thread, external screw thread and screw-internal thread fit.
Therefore the adjusting of optical path direction is wanted by being threadedly engaged, it is convenient to adjustment and installation.
Further scheme is that the first fixing piece is made of steel, stainless steel or quartz.
Further scheme is that the second fixing piece is made of steel, stainless steel or quartz.
Therefore fixing piece can be used the lower material of thermal expansion coefficient and be made, such as steel, stainless steel or quartz, make
The expansion for obtaining fixing piece is not influenced by environment temperature or operating temperature, then guarantees to filter accurate and job stability.
Detailed description of the invention
Fig. 1 is the structure chart of the utility model tunable filter first embodiment.
Fig. 2 is the explosive view of the utility model tunable filter first embodiment.
Fig. 3 is the cross-sectional view of the utility model tunable filter first embodiment.
Fig. 4 is the structure chart of the utility model tunable filter second embodiment.
Fig. 5 is the explosive view of the utility model tunable filter second embodiment.
Fig. 6 is the cross-sectional view of the utility model tunable filter second embodiment.
The following is a further explanation of the present invention with reference to the accompanying drawings and embodiments.
Specific embodiment
Tunable filter first embodiment:
Referring to figs. 1 to Fig. 3, tunable filter 1 includes the first fixing piece 11, the first optical fiber connector 12, the second fixing piece
13, the second optical fiber connector 14 and piezoelectric ceramics 15, the first optical fiber connector 12 include the first connection shell 122, the first fibre core
121 and first fiber stub 124, the first connection shell 122 is provided with mounting groove 123, the first fiber stub 124 is fixed at
On the mounting groove 123 of first connection shell 122, the first fiber stub 124 is arranged along optical path direction, the first fiber stub 124
Axial parallel with optical path direction, the first fibre core 121 passes through the first connection shell 122 along optical path direction and protrudes into the first fiber stub
In 124, the end of the first fibre core 121 extends to the exit end of the first fiber stub 124, the signal light of the first fibre core 121 transmission
It is exported in the exit end of the first fiber stub 124.
First fixing piece 11 can be made of steel, stainless steel or quartz, and the first fixing piece 11 is arranged in cylindrical body, and first is fixed
Part 11 is provided through the first installation through-hole 111 and positioning through hole 114 along optical path direction, the first installation through-hole 111 radially towards
The first convex for being inside provided with annular is located at the first installation through-hole 111 and positioning through hole 114 along 112 along 112, first convexes
Between, the first installation through-hole 111 is provided with opening outwardly, and positioning through hole 114 is provided with opening towards piezoelectric ceramics 15, and first
Fixing piece 11 is provided with the first bulge loop 113 in the first end face towards the second fixing piece 13, and the first bulge loop 113 is located at positioning through hole
The diameter of 114 periphery, the first installation through-hole 111 is greater than and the diameter of positioning through hole 114, outside in the diameter of the first bulge loop 113
Side, the first end of the first fixing piece 11 are smooth end face.First connection shell 122 is fixedly mounted in the first installation through-hole 111,
First fiber stub 124 passes through the first convex and protrudes into receiving opening 151 along 112 and positioning through hole 114.
Second optical fiber connector 14 includes the second connection shell 142, the second fibre core 141 and the second fiber stub 144, and second
Connection shell 142 is provided with mounting groove 143, and the second fiber stub 144 is fixed at the mounting groove of the second connection shell 142
On 143, the second fiber stub 144 arranges that the axial direction of the second fiber stub 144 is parallel with optical path direction along optical path direction, second
Fibre core 141 passes through the second connection shell 142 along optical path direction and protrudes into the second fiber stub 144, the end of the second fibre core 141
Extend to the exit end of the second fiber stub 144, outgoing of the signal light that the second fibre core 141 transmits in the second fiber stub 144
End output.
Second fixing piece 13 can be made of steel, stainless steel or quartz, and the second fixing piece 13 is arranged in cylindrical body, and second is fixed
Part 13 is provided through the second installation through-hole 131 and positioning through hole 134 along optical path direction, the second installation through-hole 131 radially towards
The second convex for being inside provided with annular is located at the second installation through-hole 131 and positioning through hole 134 along 132 along 132, second convexes
Between, the second installation through-hole 131 is provided with opening outwardly, and positioning through hole 134 is provided with opening towards piezoelectric ceramics 15, and second
Fixing piece 13 is provided with the second bulge loop 133 in the second end face towards the first fixing piece 11, and the second bulge loop 133 is located at positioning through hole
The diameter of 134 periphery, the second installation through-hole 131 is greater than and the diameter of positioning through hole 134, outside in the diameter of the second bulge loop 133
Side, the second end of the second fixing piece 13 are smooth end face.Second connection shell 122 is fixedly mounted in the second installation through-hole 131,
Second fiber stub 124 passes through the second convex and protrudes into receiving opening 151 along 132 and positioning through hole 134.
Piezoelectric ceramics 15 is arranged in a ring, and piezoelectric ceramics 15 is provided through receiving opening 151, piezoelectricity pottery along optical path direction
Porcelain 15 along optical path direction is connected between the first end face of the first fixing piece 11 and the second end face of the second fixing piece 13, and first
Bulge loop 113 protrudes into receiving opening 151 and the inner wall clearance fit with receiving opening 151, the second bulge loop 133 protrude into receiving opening
In 151, and the inner wall clearance fit with receiving opening 151.First installation through-hole 111, positioning through hole 114, receiving opening 151,
Positioning through hole 134 and the second installation through-hole 131 are sequentially communicated, the exit end of the first fiber stub 124 and the second fiber stub 144
Exit end it is positioned opposite in receiving opening 151.The exit end of first fiber stub 124 and the second fiber stub 144 go out
Penetrating has gap between end, form F-P between the exit end of the first fiber stub 124 and the exit end of the second fiber stub 144
Resonant cavity.
By applying voltage in piezoelectric ceramics 15, so that deformation occurs for piezoelectric ceramics comprising along the deformation of optical path direction,
Then the distance between the first fixing piece 11 and the second fixing piece 13 are had adjusted, going out for the first fiber stub 124 is finally had adjusted
The distance between the exit end of end and the second fiber stub 144 is penetrated, to realize the subtle accurate adjusting to filtered band.
Therefore by the way that piezoelectric ceramics is connected between fixing piece, and by the exit end of the first fiber stub and
The exit end of two fiber stubs is positioned opposite in receiving opening, then forms F-P resonant cavity, and utilizes the pressure of piezoelectric ceramics
Electrical effect characteristic realizes accurate adjusting subtle to the distance between fixing piece, thus realize the exit end spacing of fiber stub
It is accurate to adjust, using accurate adjustable frequency domain, make filter accurately adjustable filtering.The limit of piezoelectric ceramics is fixed by bulge loop
Installation, in piezoelectric ceramics deformation, the movement of fixing piece is coaxially to be axially moveable, and then guarantees the coaxial of filter device
Degree.By convex along the positioning to fiber stub, then guarantees concentricity of fiber stub when opposite, lower light loss.
Fixing piece can be used the lower material of thermal expansion coefficient and be made, such as steel, stainless steel or quartz so that the expansion of fixing piece not by
Environment temperature or operating temperature influence, and then guarantee to filter accurate and job stability.
Tunable filter second embodiment:
Referring to fig. 4 to fig. 6, tunable filter 2 includes the first fixing piece 21, the first optical fiber connector 22, the second fixing piece
23, the second optical fiber connector 24 and piezoelectric ceramics 25, the first optical fiber connector 22 include connection shell 222,221 and of the first fibre core
First fiber stub 224, connection shell 222 are provided with mounting groove 223, and the first fiber stub 224 is fixed at connection shell
On 222 mounting groove 223, the first fiber stub 224 is arranged along optical path direction, the axial direction of the first fiber stub 224 and optical path side
To parallel, the first fibre core 221 passes through connection shell 222 along optical path direction and protrudes into the first fiber stub 224, the first fibre core
221 end extends to the exit end of the first fiber stub 224, and the signal light of the first fibre core 221 transmission is in the first fiber stub
224 exit end output.
First fixing piece 21 can be made of steel, stainless steel or quartz, and the first fixing piece 21 is arranged in cylindrical body, and first is fixed
Part 21 is provided through the first installation through-hole 211 and positioning through hole 224 along optical path direction, the first installation through-hole 211 radially towards
The first convex for being inside provided with annular is located at the first installation through-hole 211 and positioning through hole 214 along 212 along 212, first convexes
Between, the first installation through-hole 211 is provided with opening outwardly, and positioning through hole 214 is provided with opening towards piezoelectric ceramics 25, and first
Fixing piece 21 is provided with the first bulge loop 213 in the first end face towards the second fixing piece 23, and the first bulge loop 213 is located at positioning through hole
The diameter of 214 periphery, the first installation through-hole 211 is greater than and the diameter of positioning through hole 214, outside in the diameter of the first bulge loop 213
Side, the first end of the first fixing piece 21 are smooth end face.It connects shell 222 to be fixedly mounted in the first installation through-hole 211, first
Fiber stub 224 passes through the first convex and protrudes into receiving opening 251 along 212 and positioning through hole 214.
Second optical fiber connector 24 includes connection ring 242, the second fibre core 241 and the second fiber stub 244, connection ring 242
Optical path is provided with location hole, the second fiber stub 244 arranges that the second fiber stub 244 passes through connection ring 242 along optical path direction
And be fixedly connected with connection ring 242, the second fibre core stretches in the second fiber stub along optical path direction, the end of the second fibre core 241
Portion extends to the exit end of the second fiber stub 244, signal light the going out in the second fiber stub 244 of the second fibre core 241 transmission
End output is penetrated, the hole wall of the second installation through-hole 231 is provided with internal screw thread, and the outer surface of connection ring 242 is provided with external screw thread, outer spiral shell
Line and screw-internal thread fit then realize that connection ring is mounted in the second installation through-hole 231 with being threadedly engaged, so that connection ring 242
It can be moved in the second installation through-hole 231 along optical path direction.
Second fixing piece 23 can be made of steel, stainless steel or quartz, and the second fixing piece 23 is arranged in cylindrical body, and second is fixed
Part 23 is provided through the second installation through-hole 231 and positioning through hole 234 along optical path direction, the second installation through-hole 231 radially towards
The second convex for being inside provided with annular is located at the second installation through-hole 231 and positioning through hole 234 along 232 along 232, second convexes
Between, the second installation through-hole 231 is provided with opening outwardly, and positioning through hole 234 is provided with opening towards piezoelectric ceramics 25, and second
Fixing piece 23 is provided with the second bulge loop 233 in the second end face towards the first fixing piece 21, and the second bulge loop 233 is located at positioning through hole
The diameter of 234 periphery, the second installation through-hole 231 is greater than and the diameter of positioning through hole 234, outside in the diameter of the second bulge loop 233
Side, the second end of the second fixing piece 23 are smooth end face.Connection ring 242 is mounted on the second installation through-hole 231 with being threadedly engaged
Interior, the second fiber stub 224 passes through the second convex and protrudes into receiving opening 251 along 232 and positioning through hole 234.
Piezoelectric ceramics 25 is arranged in a ring, and piezoelectric ceramics 25 is provided through receiving opening 251, piezoelectricity pottery along optical path direction
Porcelain 25 along optical path direction is connected between the first end face of the first fixing piece 21 and the second end face of the second fixing piece 23, and first
Bulge loop 213 protrudes into receiving opening 251 and the inner wall clearance fit with receiving opening 251, the second bulge loop 233 protrude into receiving opening
In 251, and the inner wall clearance fit with receiving opening 251.First installation through-hole 211, positioning through hole 224, receiving opening 251,
Positioning through hole 234 and the second installation through-hole 231 are sequentially communicated, the exit end of the first fiber stub 224 and the second fiber stub 244
Exit end it is positioned opposite in receiving opening 251.The exit end of first fiber stub 224 and the second fiber stub 244 go out
Penetrating has gap between end, form F-P between the exit end of the first fiber stub 224 and the exit end of the second fiber stub 244
Resonant cavity.
First the can be then realized by being rotatablely connected ring 242, so that the second fiber stub 241 is moved along optical path direction
Spacing between one fiber stub 224 and the second fiber stub 244 is, it can be achieved that large range of frequency range is adjusted, also, can also be led to
It crosses and applies voltage in piezoelectric ceramics 25, so that deformation occurs for piezoelectric ceramics comprising along the deformation of optical path direction, then have adjusted
The distance between first fixing piece 21 and the second fixing piece 23 finally have adjusted the exit end and second of the first fiber stub 224
The distance between the exit end of fiber stub 244, to realize the subtle accurate adjusting to filtered band.
Therefore by the way that piezoelectric ceramics is connected between fixing piece, and by the exit end of the first fiber stub and
The exit end of two fiber stubs is positioned opposite in receiving opening, then forms F-P resonant cavity, and utilizes the pressure of piezoelectric ceramics
Electrical effect characteristic realizes accurate adjusting subtle to the distance between fixing piece, in addition can also pass through the optical path direction of connection ring
It is mobile that fiber stub spacing is adjusted, to realize that a wide range of of the exit end spacing of fiber stub is adjusted and subtle accurate tune
Section keeps the filtering adjustable extent of filter big and accurate high using accurate adjustable frequency domain.
Claims (10)
1. tunable filter characterized by comprising
First fixing piece, first fixing piece are provided through the first installation through-hole along optical path direction；
First optical fiber connector, first optical fiber connector includes connecting shell, the first fibre core and the first fiber stub, described
First fiber stub is fixed on the connection shell, and first fibre core passes through the connection shell along optical path direction
It protrudes into first fiber stub, the connection shell is fixedly mounted in first installation through-hole；
Second fixing piece, second fixing piece are provided through the second installation through-hole along optical path direction；
Second optical fiber connector, second optical fiber connector include connection ring, the second fibre core and the second fiber stub, and described
Two fiber stubs pass through the connection ring and are fixedly connected with the connection ring, and second fibre core stretches to institute along optical path direction
It states in the second fiber stub, the connection ring is mounted in second installation through-hole with being threadedly engaged, and the connection ring can be
It is moved in second installation through-hole；
Piezoelectric ceramics, the piezoelectric ceramics are arranged in a ring, and the piezoelectric ceramics is provided through receiving opening along optical path direction,
The piezoelectric ceramics along optical path direction is connected between first fixing piece and second fixing piece, first installation
Through-hole, the receiving opening and second installation through-hole are sequentially communicated, the exit end of first fiber stub and described
The exit end of two fiber stubs is positioned opposite in the receiving opening.
2. tunable filter according to claim 1, it is characterised in that:
First fixing piece is provided with the first bulge loop in the first end face towards second fixing piece, the piezoelectric ceramics
First end is connect with the first end face of first fixing piece, and first bulge loop protrudes into the receiving opening.
3. tunable filter according to claim 2, it is characterised in that:
Second fixing piece is provided with the second bulge loop in the second end face towards first fixing piece, the piezoelectric ceramics
Second end is connect with the second end face of second fixing piece, and second bulge loop protrudes into the receiving opening.
4. tunable filter according to claim 2, it is characterised in that:
The inner wall clearance fit of first bulge loop and the receiving opening.
5. tunable filter according to claim 3, it is characterised in that:
The inner wall clearance fit of second bulge loop and the receiving opening.
6. tunable filter according to claim 1, it is characterised in that:
First installation through-hole is provided with the first convex edge radially inwards, and first fiber stub passes through described first
Convex edge.
7. tunable filter according to claim 6, it is characterised in that:
Second installation through-hole is provided with the second convex edge radially inwards, and second fiber stub passes through described second
Convex edge.
8. tunable filter according to claim 1, it is characterised in that:
The hole wall of second installation through-hole is provided with internal screw thread, and the outer surface of the connection ring is provided with external screw thread, described outer
Screw thread and the screw-internal thread fit.
9. tunable filter according to any one of claims 1 to 8, it is characterised in that:
First fixing piece is made of steel, stainless steel or quartz.
10. tunable filter according to any one of claims 1 to 8, it is characterised in that:
Second fixing piece is made of steel, stainless steel or quartz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822197110.8U CN209327614U (en) | 2018-12-25 | 2018-12-25 | Tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822197110.8U CN209327614U (en) | 2018-12-25 | 2018-12-25 | Tunable filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209327614U true CN209327614U (en) | 2019-08-30 |
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ID=67728788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822197110.8U Active CN209327614U (en) | 2018-12-25 | 2018-12-25 | Tunable filter |
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| Country | Link |
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| CN (1) | CN209327614U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491018A (en) * | 2018-12-25 | 2019-03-19 | 珠海光库科技股份有限公司 | Fast tunable filter |
| CN114815071A (en) * | 2022-04-21 | 2022-07-29 | 上海拜安传感技术有限公司 | Optical fiber filter, packaging component thereof and assembling method |
-
2018
- 2018-12-25 CN CN201822197110.8U patent/CN209327614U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491018A (en) * | 2018-12-25 | 2019-03-19 | 珠海光库科技股份有限公司 | Fast tunable filter |
| CN114815071A (en) * | 2022-04-21 | 2022-07-29 | 上海拜安传感技术有限公司 | Optical fiber filter, packaging component thereof and assembling method |
| CN114815071B (en) * | 2022-04-21 | 2023-05-16 | 上海拜安传感技术有限公司 | Optical fiber filter, packaging component thereof and assembling method |
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