CN207423216U - A kind of M-Z optical interference circuit structures for having the function of that all risk insurance is inclined - Google Patents
A kind of M-Z optical interference circuit structures for having the function of that all risk insurance is inclined Download PDFInfo
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- CN207423216U CN207423216U CN201721508604.2U CN201721508604U CN207423216U CN 207423216 U CN207423216 U CN 207423216U CN 201721508604 U CN201721508604 U CN 201721508604U CN 207423216 U CN207423216 U CN 207423216U
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Abstract
The utility model proposes a kind of M Z optical interference circuit structures for having the function of that all risk insurance is inclined, including light splitting device, the first polarization-maintaining transferring device, the first faraday rotation mirror, the second polarization-maintaining transferring device, the second faraday rotation mirror, the first polarization-maintaining coupler.First polarization-maintaining transferring device includes first port, second port, third port, its first port receives the first polarised light of light splitting device output, second port is connected with the first faraday rotation mirror, and third port is connected with the first port of the first polarization-maintaining coupler.Second polarization-maintaining transferring device includes first port, second port, third port, its first port receives the second polarised light of light splitting device output, second port is connected with the second faraday rotation mirror, and third port is connected with the second port of the first polarization-maintaining coupler.The utility model is sensed suitable for long-distance distributed optical fiber, such as the monitoring of fiber communication link, long range circumference, oil, the fields such as Safety monitoring of natural gas line.
Description
Technical field
The utility model is related to technical field of optical fiber sensing, interfere more particularly to a kind of M-Z for having the function of that all risk insurance is inclined
Light channel structure.
Background technology
With the development of optical fiber technology, optical fiber sensing technology is paid attention to by more and more application fields, wherein M-Z
(Mach-Zehnder, Mach-Zehnder) interference structure is a kind of common sensing technology, is commonly used for the vibrations such as optical fiber perimeter
(bibliography in Detection Techniques：Laser is with infrared, Zhu Yan, Dai Zhiyong etc., and distributed optical fiber vibration sensing technology and development are dynamic
State, 2011,10, P1072), concrete structure is as shown in Figure 1, wherein, L1And L2For single mode optical fiber, the first coupler 1 sends out light source
The light gone out is divided into two-way, is injected separately into single mode optical fiber L1And L2, through single mode optical fiber L1、L2The light of transmission converges at the second coupler 2
It closes, interferes, interference signal is detected via detector.In this configuration, single mode optical fiber L1And/or L2As sense light
Fibre acts on sensor fibre, such as single mode optical fiber L when there is external disturbance1On, the variation of light path will be caused, by interference effect,
Change in optical path length can be changed into the variation of interference light intensity, so as to fulfill the monitoring to circuit disturbance situation.
Although above-mentioned M-Z interference structures are realized simply, since the polarization characteristic of single mode optical fiber itself is highly prone to outside
The influence of boundary's environmental factor causes through single mode optical fiber L1、L2Two-beam after transmission reaches the polarization shape at the second coupler 2
State is random, therefore the polarization state for forming the light of interference is also occurring to change always, in extreme circumstances, when this two-beam
When polarization state is mutually orthogonal, this two-beam will not form interference, and detector will be detected less than interference signal.Therefore, this profit
, often because polarization stability is poor, and there is serious mistake, fail to report in the M-Z structures realized with single mode optical fiber.From optical knowledge,
If forming the inclined structure of all risk insurance using polarization maintaining optical fibre, it can solve the problems, such as that polarization stability is poor, still, due to polarization maintaining optical fibre
Cost factor reduces the availability of the technology.Meanwhile the technology can not also utilize the communications optical cable laid to realize biography
Sense, is not suitable for distributing optical fiber sensing.In Distributed Optical Fiber Sensing Techniques, in order to ensure the practicability of technology, still use
Common single mode optical fiber is as sensor fibre in communication, for example, in oil-gas pipeline safety monitoring technology, using along Oil/Gas Pipe
The single mode fiber cable that line is laid with realizes sensing.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide one kind to have the function of that all risk insurance is inclined
M-Z optical interference circuit structures, for solving not realizing biography due to polarization stability caused by single mode optical fiber polarizes neurological susceptibility is poor
The problem of sense.
In order to achieve the above objects and other related objects, the utility model provides a kind of M-Z for having the function of that all risk insurance is inclined and does
Light channel structure is related to, including light splitting device, the first polarization-maintaining transferring device, the second polarization-maintaining transferring device, the first Faraday rotation
Mirror, the second faraday rotation mirror, the first polarization-maintaining coupler, the light splitting device are used to receive the light of light source input, and defeated
Go out polarization state consistent the first polarised light and the second polarised light；The first polarization-maintaining transferring device includes first port, second
Port, third port, the first port of the first polarization-maintaining transferring device receive described the of the light splitting device output
One polarised light, the second port of the first polarization-maintaining transferring device are connected with first faraday rotation mirror, and described first protects
The third port of inclined transferring device is connected with the first port of first polarization-maintaining coupler, wherein, the first polarization-maintaining transfer
Between the first port of device and the light splitting device, the third port of the first polarization-maintaining transferring device and described first
The optical fiber being connected between the first port of polarization-maintaining coupler is polarization maintaining optical fibre；The second polarization-maintaining transferring device includes first end
Mouth, second port, third port, the first port of the second polarization-maintaining transferring device receive the light splitting device output
Second polarised light, the second port of the second polarization-maintaining transferring device is connected with second faraday rotation mirror, described
The third port of second polarization-maintaining transferring device is connected with the second port of first polarization-maintaining coupler, wherein, described second protects
Between the first port and the light splitting device of inclined transferring device, the third port of the second polarization-maintaining transferring device and institute
It is polarization maintaining optical fibre to state the optical fiber being connected between the second port of the first polarization-maintaining coupler.
Further, the M-Z optical interference circuits structure further includes injection fibre, and the light of the light source input is linear polarization
Light, the injection fibre are polarization maintaining optical fibre, and the linearly polarized light is defeated along the polarization principal axis of the working-spindle of the injection fibre
Enter the light splitting device.
Further, the light splitting device is polarization-maintaining beam splitter.
Further, the light splitting device is polarization-maintaining coupling device.
Further, the light splitting device is the polarization-maintaining coupling device uniaxially or biaxially to work.
Further, the first polarization-maintaining transferring device and the second polarization-maintaining transferring device are polarization beam apparatus, institute
It is partial wave port to state the first port of the first polarization-maintaining transferring device and third port, the second end of the first polarization-maintaining transferring device
Mouth is multiplex port, and the first port and third port of the second polarization-maintaining transferring device are partial wave ports, second polarization-maintaining
The second port of transferring device is multiplex port.
Further, the first polarization-maintaining transferring device and the second polarization-maintaining transferring device use 90 ° of polarization-maintaining welding.
Further, the first polarization-maintaining transferring device includes the first polarization-maintaining circulator, the first polarizer, and described first protects
The first port of inclined circulator receives first polarised light of the light splitting device output, the first polarization-maintaining circulator
Second port be connected with first faraday rotation mirror, the third port of the first polarization-maintaining circulator with described first partially
The device that shakes is connected, and first polarizer is connected with the first port of first polarization-maintaining coupler, wherein, the first polarization-maintaining ring
Between the first port of shape device and the light splitting device, the third port of the first polarization-maintaining circulator with described first partially
The optical fiber being connected between device, between first polarizer and the first port of first polarization-maintaining coupler that shakes is polarization-maintaining light
It is fine；The second polarization-maintaining transferring device include the second polarization-maintaining circulator, the second polarizer, the first of the second polarization-maintaining circulator
Port receives second polarised light of the light splitting device output, the second port of the second polarization-maintaining circulator and institute
It states the second faraday rotation mirror to be connected, the third port of the second polarization-maintaining circulator is connected with second polarizer, described
Second polarizer is connected with the second port of first polarization-maintaining coupler, wherein, the first end of the second polarization-maintaining circulator
Mouthful between the light splitting device, between the third port of the second polarization-maintaining circulator and second polarizer, institute
It is polarization maintaining optical fibre to state the optical fiber being connected between the second polarizer and the second port of first polarization-maintaining coupler.
Further, between the second port of the first polarization-maintaining transferring device and first faraday rotation mirror, institute
The optical fiber being connected between the second port of the second polarization-maintaining transferring device and second faraday rotation mirror is stated by sensing optic cable bag
It wraps up in.
Further, first polarization-maintaining coupler is two-way or multi-channel optical fiber coupler.
A kind of M-Z optical interference circuit structures for having the function of that all risk insurance is inclined of the utility model, have the advantages that：
(1) utilize polarization-preserving optical fibre device characteristic, in optical interference circuit there are single mode optical fiber in the case of, realizing has
The M-Z light channel structures of the inclined function of all risk insurance；
(2) coherent beam polarization uniformity is high, has high interference fringe clarity, can obtain high measurement sensitivity,
Precision；
(3) interfering beam takes single polarization operating mode, can eliminate dissipating backwards in fiber path to a certain extent
Penetrate the influence of light；
(4) it is particularly available to have laid using single mode optical fiber as sensor fibre due to the use of single mode optical fiber
Optical cable for communication realize sensing, strong applicability is easy to the popularization and application of the technology.
The utility model is sensed especially suitable for long-distance distributed optical fiber, for example, the prison available for fiber communication link
Control, long range circumference, oil, the fields such as Safety monitoring of natural gas line.
Above description is only the general introduction of technical solutions of the utility model, in order to better understand the skill of the utility model
Art means, and being practiced according to the content of specification, and in order to allow the above and other purpose, feature of the utility model
It can be clearer and more comprehensible with advantage, it is special below to lift preferred embodiment, and coordinate attached drawing, detailed description are as follows.
Description of the drawings
Fig. 1 is a kind of existing M-Z optical interference circuits structure.
Fig. 2 is the M-Z optical interference circuit structures for having the function of that all risk insurance is inclined of the utility model first embodiment.
Fig. 3 is the M-Z optical interference circuit structures for having the function of that all risk insurance is inclined of the utility model second embodiment.
Fig. 4 is the M-Z optical interference circuit structures for having the function of that all risk insurance is inclined of the utility model 3rd embodiment.
Wherein, L1 and L2 is single mode optical fiber, and 1 is the first coupler, 2 be the second coupler, and 3 be light splitting device, and 4 are
First polarization-maintaining transferring device, 5 be the first faraday rotation mirror, and 6 be the second polarization-maintaining transferring device, and 7 be the second faraday rotation mirror,
8 be the first polarization-maintaining coupler；9 be 3 injection fibre, is polarization maintaining optical fibre；10 fill for 3 and first polarization-maintaining transfer of light splitting device
Put the optical fiber between 4；11 optical fiber between the first polarization-maintaining transferring device 4 and the first polarization-maintaining coupler 8；12 fill for polarization spectro
Put the optical fiber between the 3, second polarization-maintaining transferring device 6；13 light between the second polarization-maintaining transferring device 6, the first polarization-maintaining coupler 8
It is fine；14 optical fiber between the first polarization-maintaining transferring device 4, the first faraday rotation mirror 5；15 be the second polarization-maintaining transferring device 6, the
Optical fiber between two faraday rotation mirrors 7；41 be the first polarization-maintaining circulator, and 61 be the second polarization-maintaining circulator, and 42 be the first polarization
Device, 62 be the second polarizer；111 optical fiber between the first polarization-maintaining circulator 41, the first polarizer 42；131 be the second polarization-maintaining
Optical fiber between circulator 61, the second polarizer 62；112 optical fiber between the first polarization-maintaining coupler 8, the first polarizer 42；
132 optical fiber between the first polarization-maintaining coupler 8, the second polarizer 62；16 be sensing optic cable, and 17 be the first polarization-maintaining coupler 8
Output optical fibre.
Specific embodiment
Fig. 2 is the M-Z optical interference circuit structures of the utility model first embodiment.As shown in Fig. 2, the utility model first is real
Applying the M-Z optical interference circuits structure of example includes light splitting device 3, the first polarization-maintaining transferring device 4, the first faraday rotation mirror 5, the
Two polarization-maintaining transferring devices 6, the second faraday rotation mirror 7, the first polarization-maintaining coupler 8.
In one embodiment, light splitting device 3 can be, but not limited to as polarization-maintaining beam splitter, or uniaxial or double
The polarization-maintaining coupling device and/or the first polarization-maintaining transferring device 4 of axis work can be, but not limited to as polarization beam apparatus, or
Polarization-maintaining circulator and/or the first polarization-maintaining transferring device 6 can be, but not limited to as polarization beam apparatus, or polarization-maintaining circulator,
And/or first polarization-maintaining coupler 8 can be, but not limited to two-way polarization-maintaining fiber coupler, or multi-channel optical fiber couple
Device.Wherein, when the first polarization-maintaining transferring device 4 is polarization beam apparatus, the first port and third port of the first polarization-maintaining transferring device 4
It is partial wave port, the second port of the first polarization-maintaining transferring device 4 is multiplex port；Second polarization-maintaining transferring device 6 is polarization beam splitting
During device, the first port and third port of the second polarization-maintaining transferring device 6 are partial wave ports, the second of the second polarization-maintaining transferring device 6
Port is multiplex port.
In one embodiment, M-Z optical interference circuits structure further includes injection fibre 9, and the light of light source input is linearly polarized light,
Injection fibre 9 be polarization maintaining optical fibre, polarization principal axis input polarization light-dividing device of the linearly polarized light along the working-spindle of injection fibre 9
3, because injection fibre 9 is polarization maintaining optical fibre, then the polarization direction of linearly polarized light remains unchanged in injection fibre 9.
First polarization-maintaining transferring device 4 includes first port, second port, third port, and the of the first polarization-maintaining transferring device 4
Single port receive light splitting device 3 export the first polarised light, the second port of the first polarization-maintaining transferring device 4 with first farad
Revolving mirror 5 is connected, and the third port of the first polarization-maintaining transferring device 4 is connected with the first port of the first polarization-maintaining coupler 8,
In, the optical fiber 10, the first polarization-maintaining transfer dress that are connected between the first port of the first polarization-maintaining transferring device 4 and light splitting device 3
It is polarization maintaining optical fibre to put the optical fiber 11 being connected between 4 third port and the first port of the first polarization-maintaining coupler 8.Second polarization-maintaining
Transferring device 6 includes first port, second port, third port, and the first port of the second polarization-maintaining transferring device 6 receives polarization point
The second polarised light that electro-optical device 3 exports, the second port of the second polarization-maintaining transferring device 6 are connected with the second faraday rotation mirror 7, the
The third port of two polarization-maintaining transferring devices 6 is connected with the second port of the first polarization-maintaining coupler 8, wherein, the second polarization-maintaining transfer dress
Put the third port and the of the optical fiber 12 being connected between 6 first port and light splitting device 3, the second polarization-maintaining transferring device 6
The optical fiber 13 being connected between the second port of one polarization-maintaining coupler 8 is polarization maintaining optical fibre.
Wherein, light splitting device 3 is used to receive the light of light source input, and exports the first consistent polarised light of polarization state
With the second polarised light.Light splitting device 3 is the device of polarization spectro, for obtaining the consistent polarised light of two beam polarization states,
But the utility model is not limited thereto, and light splitting device 3 can also obtain the multichannel light beam with polarization state is determined
Device.
First polarization-maintaining transferring device 4 has the light inputted from first port, and light is only exported from second port, from second port
The light of input, the function that light is only exported from third port；Second polarization-maintaining transferring device 6 has the light inputted from first port, light
It is only exported from second port, the light inputted from second port, the function that light is only exported from third port.
Specifically, when light source is input to light splitting device 3, it is inclined to obtain two beams by polarization spectro for light splitting device 3
Shake the polarised light of state consistency.This two beams polarised light is respectively the first polarised light and the second polarised light.First polarised light first passes through
Optical fiber 10 is input to the first port of the first polarization-maintaining transferring device 4, and optical fiber 10 is polarization maintaining optical fibre, then in optical fiber 10 first partially
The shake polarization direction of light remains unchanged.First polarised light exports again from the second port of the first polarization-maintaining transferring device 4, passes through connection
Optical fiber 14 between the second port of the first polarization-maintaining transferring device 4 and faraday rotation mirror 5, is transferred to faraday rotation mirror 5,
Through 14 backtracking of optical fiber to the second port of the first polarization-maintaining transferring device 4 after the reflection of faraday rotation mirror 5.Wherein, first
For polarised light when being transferred to faraday rotation mirror 5 and from during the reflection output of faraday rotation mirror 5, polarization direction can rotate 90
Degree, and the first polarised light is backtracking in optical fiber 14, so no matter the first polarised light is in the transmission process of optical fiber 14
Which kind of change of polarization is generated, from the inclined of the first polarised light of the output of the second port of the first polarization-maintaining transferring device 4 and input
The direction that shakes only changes 90 degree, that is to say, that optical fiber 14 can use single mode optical fiber, even if the first polarised light in optical fiber 14 by
Change polarization direction to the influence of outside environmental elements, but the first polarised light is returning to the of the first polarization-maintaining transferring device 4
During Two-port netwerk, the polarization direction of the first polarised light is fixed change when being exported with the second port from the first polarization-maintaining transferring device 4
90 degree, therefore, even if optical fiber 14 using single mode optical fiber, nor affect on the first polarised light from optical fiber 14 export when it is opposite from optical fiber 14
The stability of the polarization state of polarised light during input.
Equally, the second polarised light is input to the first port of the second polarization-maintaining transferring device 6 by optical fiber 12, and optical fiber 12 is
Polarization maintaining optical fibre, then the polarization state of second polarised light remains unchanged in optical fiber 12.The second port of second polarization-maintaining transferring device 6 is defeated
Go out the second polarised light, pass through the optical fiber being connected between the second port of the second polarization-maintaining transferring device 6 and faraday rotation mirror 7
15, faraday rotation mirror 7 is transferred to, the second polarised light after the reflection of faraday rotation mirror 7 is through 15 backtracking of optical fiber to the
The second port of two polarization-maintaining transferring devices 6.Wherein, the second polarised light is revolved when being transferred to faraday rotation mirror 7 and from faraday
During the reflection output of tilting mirror 7, polarization direction can be rotated by 90 °, and the second polarised light is backtracking in optical fiber 15, so
No matter which kind of change of polarization the first polarised light generates in the transmission process of optical fiber 15, from the second polarization-maintaining transferring device 6
Second port exports and the polarization direction of the second polarised light of input only changes 90 degree, that is to say, that optical fiber 15 can use
Single mode optical fiber, even if the second polarised light is influenced be subject to outside environmental elements in optical fiber 15 and changes polarization direction, but the
Two polarised lights when returning to the second port of the second polarization-maintaining transferring device 6, the polarization direction of the second polarised light with from the second polarization-maintaining
It is fixed 90 degree of change during the second port output of transferring device 6, therefore, even if optical fiber 15 is nor affected on using single mode optical fiber
The stability of polarization state when first polarised light inputs when being exported from optical fiber 15 from optical fiber 15 relatively.
Then, the first polarised light of the third port output of the first polarization-maintaining transferring device 4 is input to first by optical fiber 11
Polarization-maintaining coupler 8, the second polarised light of the third port output of the second polarization-maintaining transferring device 6 are input to the first guarantor by optical fiber 13
Inclined coupler 8.Wherein, optical fiber 11 and optical fiber 13 are polarization maintaining optical fibres, then the polarization direction of the first polarised light is kept in the fibre 11
Constant, the polarization direction of second polarised light remains unchanged in optical fiber 13.The polarization state of first polarised light and the second polarised light
Unanimously, and at the first polarization-maintaining coupler 8 interfered, interference signal can be detected by detector.
Wherein, optical fiber 10, optical fiber 11, optical fiber 12, optical fiber 13 are all polarization maintaining optical fibres, thus can be made consistent with its polarization principal axis
The polarised light of direction incidence keep its polarizability.First polarised light, the second polarised light are transmitted along polarization principal axis, if optical fiber 10
In first polarization optical transport when corresponding Orientation of polarized main axis polarization principal axis be working-spindle, then the second polarised light is in optical fiber 12
In be also transmitted along working-spindle.If the polarization state for the light that polarised light polarizes in working-spindle direction is perpendicular polarisation state, use
" ⊥ " is represented, the polarization state orthogonal with perpendicular polarisation state is horizontal polarization, is represented with " ∥ ".Then the first polarised light is transferred to first
During the first port of polarization-maintaining transferring device 4, the first polarised light is vertical polarization.When the first polarised light is returned from faraday rotation mirror 5
The second port of the first polarization-maintaining transferring device 4 is returned to, the first polarised light inputs the first of the first polarization-maintaining transferring device 4 compared with it
Polarization direction has rotated 90 degree during port, is horizontal polarization.First polarised light is from the third port of the first polarization-maintaining transferring device 4
During output, the first polarised light is horizontal polarization.Similarly, the second polarised light is transferred to the first end of the second polarization-maintaining transferring device 6
During mouth, the second polarised light is vertical polarization；When the second polarised light returns to the second polarization-maintaining transferring device 6 from faraday rotation mirror 7
Second port, the second polarised light compared with its input the second polarization-maintaining transferring device 6 first port when, polarization direction has rotated
90 degree, be horizontal polarization；From during the third port output of the second polarization-maintaining transferring device 6, the second polarised light is second polarised light
Horizontal polarization.And the first polarised light inputs the first polarization-maintaining coupler 8 by optical fiber 11, the second polarised light passes through the input of optical fiber 13 the
One polarization-maintaining coupler 8, so input the first polarised light of the first polarization-maintaining coupler 8, the polarization state of the second polarised light are identical and all
It is horizontal polarization, the first polarised light, the second polarised light are interfered at the first polarization-maintaining coupler 8, and interference signal can be by detecting
Device is detected.
In one embodiment, can be as needed for polarised light is made to be transmitted always along working-spindle, polarization maintaining optical fibre melts
Connect the polarization-maintaining welding mode using 0 ° or 90 °.Specifically, hang down along the polarization principal axis injection one of the working-spindle of injection fibre 9
The linearly polarized light directly polarized, optical fiber 14, optical fiber 15 are single mode optical fiber, the first polarization-maintaining transferring device 4 and the second polarization-maintaining transferring device 6
For polarization beam apparatus, then for the first polarised light from during the third port output of the first polarization-maintaining transferring device 4, the first polarised light is horizontal
Polarization, then in order to which the first polarised light is made to be transmitted always along working-spindle, in the third port and optical fiber of the first polarization-maintaining transferring device 4
90 ° of polarization-maintaining welding is used between 11.Equally, when third port output of second polarised light from the second polarization-maintaining transferring device 6, the
Two polarised lights are horizontal polarizations, in order to which the second polarised light is made to be transmitted always along working-spindle, the of the second polarization-maintaining transferring device 6
90 ° of polarization-maintaining welding is used between three ports and optical fiber 13.So the first polarised light of the first polarization-maintaining coupler 8 of input, second are partially
Shake light polarization state it is identical and be all vertical polarization, the first polarised light, the second polarised light are done at the first polarization-maintaining coupler 8
It relates to, interference signal can be detected by detector.First polarised light, the polarization variations of the second polarised light are as follows：
Ⅰ：Injection fibre 9 (⊥) → light splitting device 3 (⊥) → (⊥) → first polarization-maintaining of optical fiber 10 transferring device 4 (⊥)
5 (random) → optical fiber of → optical fiber 14 (⊥ or random) → first faraday rotation mirror, 14 polarization-maintaining of (random) → first transferring device 4
(∥) → optical fiber 11 (⊥) → first polarization-maintaining coupler 8 (⊥)
Ⅱ：Injection fibre 9 (⊥) → light splitting device 3 (⊥) → (⊥) → second polarization-maintaining of optical fiber 12 transferring device 6
7 (random) → optical fiber of (⊥) → optical fiber 15 (⊥ or random) → second faraday rotation mirror, 15 polarization-maintaining of (random) → second transfer fills
Put 6 (∥) → optical fiber, 13 polarization-maintaining coupler of (⊥) → first 8 (⊥)
As it can be seen that in the transmission process of entire light, except optical fiber 14, optical fiber 15, the first polarization-maintaining transferring device 4, the second polarization-maintaining
Light in transferring device 6, remaining light transmit all along polarization maintaining optical fibre working-spindle direction, ensure that and be eventually returned to the first polarization-maintaining
Polarization state during coupler 8 is consistent；Simultaneously as ensure single polarization state of the light when coherent beam merges, thus can be with
The back-scattering light on sensor fibre path is eliminated to a certain extent.
The utility model first embodiment employs the combination of single mode optical fiber and faraday rotation mirror, eliminates single mode optical fiber
Influence of the upper polarization variations to interference, thus sensed especially suitable for long-distance distributed optical fiber, such as it is used for fiber communication link
Monitoring, long range circumference, oil, the fields such as Safety monitoring of natural gas line.
Fig. 3 is the M-Z optical interference circuit structures of the utility model second embodiment.M-Z optical interference circuit structures as shown in Figure 3
Essentially identical with M-Z optical interference circuits structure shown in Fig. 2, difference is only in that：Light splitting device 3 is polarization-maintaining coupling dress
It puts.Specifically, light splitting device 3 is the polarization-maintaining coupling device uniaxially or biaxially to work；First polarization-maintaining transferring device 4 includes the
One polarization-maintaining circulator 41 and the first polarizer 42；Second polarization-maintaining transferring device 6 includes the second polarization-maintaining circulator 61 and the second polarization
Device 62.The first port of first polarization-maintaining circulator 41 receives the first polarised light that light splitting device 3 exports, the first polarization-maintaining annular
The second port of device 41 is connected with the first faraday rotation mirror 5, third port and the first polarizer of the first polarization-maintaining circulator 41
42 are connected, and the first polarizer 42 is connected with the first port of the first polarization-maintaining coupler 8, wherein, the of the first polarization-maintaining circulator 41
Optical fiber 10, the third port of the first polarization-maintaining circulator 41 and the first polarizer being connected between Single port and light splitting device 3
The optical fiber 112 being connected between the optical fiber 111, the first polarizer 42 and the first port of the first polarization-maintaining coupler 8 that are connected between 42
It is polarization maintaining optical fibre.The second polarised light that the first port reception light splitting device 3 of second polarization-maintaining circulator 61 exports, second
The second port of polarization-maintaining circulator 61 is connected with the second faraday rotation mirror 7, the third port of the second polarization-maintaining circulator 61 and the
Two polarizers 62 are connected, and the second polarizer 62 is connected with the second port of the first polarization-maintaining coupler 8, wherein, the second polarization-maintaining annular
The optical fiber 12 that is connected between the first port of device 61 and light splitting device 3, the third port of the second polarization-maintaining circulator 61 and the
It is connected between the optical fiber 131, the second polarizer 62 and the second port of the first polarization-maintaining coupler 8 that are connected between two polarizers 62
Optical fiber 132 is polarization maintaining optical fibre.
Wherein, the first polarization-maintaining circulator 41 has the light inputted from first port, and light is only exported from second port, from second
The light of port input, the function that light is only exported from third port；Second polarization-maintaining circulator 61 has the light inputted from first port,
Light is only exported from second port, the light inputted from second port, the function that light is only exported from third port.First polarizer 42,
Second polarizer 62 for obtaining polarised light, and filters out the stray light different with polarization light polarization direction.
In one embodiment, M-Z optical interference circuits structure further includes injection fibre 9, and the light of light source input is linearly polarized light,
Injection fibre 9 be polarization maintaining optical fibre, polarization principal axis input polarization light-dividing device of the linearly polarized light along the working-spindle of injection fibre 9
3, because injection fibre 9 is polarization maintaining optical fibre, then the polarization direction of linearly polarized light remains unchanged in injection fibre 9.
Wherein, optical fiber 10, optical fiber 111, optical fiber 112, optical fiber 12, optical fiber 131, optical fiber 132 are all polarization maintaining optical fibres, thus energy
The polarised light of the direction incidence consistent with its polarization principal axis is made to keep its polarizability.First polarised light, the second polarised light are along inclined
The main shaft that shakes transmits, if the polarization principal axis of corresponding Orientation of polarized main axis is working-spindle during the first polarization optical transport in optical fiber 10,
Then the second polarised light is also to be transmitted along working-spindle in optical fiber 12.If the polarization for the light that polarised light polarizes in working-spindle direction
State is perpendicular polarisation state, is represented with " ⊥ ", and the polarization state orthogonal with perpendicular polarisation state is horizontal polarization, is represented with " ∥ ".Then
When one polarised light is transferred to the first port of the first polarization-maintaining circulator 41, the first polarised light is vertical polarization.When the first polarised light
The second port of the first polarization-maintaining circulator 41 is returned to from faraday rotation mirror 5, the first polarised light inputs first compared with it and protects
Polarization direction has rotated 90 degree during the first port of inclined circulator 41, is horizontal polarization.First polarised light is from the first polarization-maintaining ring
During the third port output of shape device 41, the first polarised light is horizontal polarization.Similarly, the second polarised light is transferred to the second polarization-maintaining ring
During the first port of shape device 61, the second polarised light is vertical polarization；When the second polarised light returns to second from faraday rotation mirror 7
The second port of polarization-maintaining circulator 61, the second polarised light polarize when the first port of the first polarization-maintaining circulator 41 is inputted compared with it
Direction has rotated 90 degree, is horizontal polarization.Second polarised light is from during the output of the third port of the second polarization-maintaining circulator 61, and second
Polarised light is horizontal polarization.And the first polarised light inputs the first polarizer 42 by optical fiber 111, then input the first polarization-maintaining coupler
8, the second polarised light inputs the second polarizer 62 by optical fiber 13, then inputs the first polarization-maintaining coupler 8, so the first polarization-maintaining of input
First polarised light of coupler 8, the polarization state of the second polarised light are identical and are all horizontal polarizations, and the first polarised light, second polarize
Light is interfered at the first polarization-maintaining coupler 8, and interference signal can be detected by detector.
In one embodiment, can be as needed for polarised light is made to be transmitted always along working-spindle, polarization maintaining optical fibre melts
Connect the polarization-maintaining welding mode using 0 ° or 90 °.Specifically, hang down along the polarization principal axis injection one of the working-spindle of injection fibre 9
The linearly polarized light directly polarized, optical fiber 14, optical fiber 15 are single mode optical fiber, the first polarization-maintaining transferring device 4 and the second polarization-maintaining transferring device 6
For polarization beam apparatus, then when third port output of first polarised light from the first polarization-maintaining circulator 41, the first polarised light is water
Flat polarization, then in order to which the first polarised light is made to be transmitted always along working-spindle, in the third port and light of the first polarization-maintaining circulator 41
90 ° of polarization-maintaining welding is used between fibre 111.Equally, when third port output of second polarised light from the second polarization-maintaining circulator 61,
Second polarised light is horizontal polarization, in order to which the second polarised light is made to be transmitted always along working-spindle, in the second polarization-maintaining circulator 61
90 ° of polarization-maintaining welding is used between third port and optical fiber 131.So the first polarised light of the first polarization-maintaining coupler 8 of input, second
The polarization state of polarised light is identical and is all vertical polarization, and the first polarised light, the second polarised light carry out at the first polarization-maintaining coupler 8
Interference, interference signal can be detected by detector.First polarised light, the polarization variations of the second polarised light are as follows：
Ⅰ：Injection fibre 9 (⊥) → light splitting device 3 (⊥) → (⊥) → first polarization-maintaining of optical fiber 10 circulator 41 (⊥)
5 (random) → optical fiber of → optical fiber 14 (⊥ or random) → first faraday rotation mirror, 14 polarization-maintaining of (random) → first circulator 41
42 (⊥) → optical fiber of (∥) → optical fiber 111 (⊥) → first polarizer, 112 polarization-maintaining coupler of (⊥) → first 8 (⊥)
Ⅱ：Injection fibre 9 (⊥) → light splitting device 3 (⊥) → (⊥) → second polarization-maintaining of optical fiber 12 circulator 61 (⊥)
7 (random) → optical fiber of → optical fiber 15 (⊥ or random) → second faraday rotation mirror, 15 polarization-maintaining of (random) → second circulator 61
62 (⊥) → optical fiber of (∥) → optical fiber 131 (⊥) → second polarizer, 132 polarization-maintaining coupler of (⊥) → first 8 (⊥)
As it can be seen that in the transmission process of entire light, except optical fiber 14, optical fiber 15, the first polarization-maintaining circulator 41, the second polarization-maintaining ring
Light in shape device 61, remaining light transmit all along the working-spindle direction of polarization maintaining optical fibre, ensure that and be eventually returned to the first polarization-maintaining
Polarization state during coupler 8 is consistent；Simultaneously as ensure single polarization state of the light when coherent beam merges, thus can be with
The back-scattering light on sensor fibre path is eliminated to a certain extent.
The utility model second embodiment employs the combination of single mode optical fiber and faraday rotation mirror, eliminates single mode optical fiber
Influence of the upper polarization variations to interference, thus sensed especially suitable for long-distance distributed optical fiber, such as it is used for fiber communication link
Monitoring, long range circumference, oil, the fields such as Safety monitoring of natural gas line.
Fig. 4 is the M-Z optical interference circuit structures of the utility model 3rd embodiment.M-Z optical interference circuit structures as shown in Figure 4
Essentially identical with M-Z optical interference circuits structure shown in Fig. 2, difference is only in that：The second end of first polarization-maintaining transferring device 4
Between mouth and the first faraday rotation mirror 5, between the second port of the second polarization-maintaining transferring device 6 and the second faraday rotation mirror 7
Connected optical fiber is wrapped up by sensing optic cable 16.Optical interference circuit structure includes a detector, the interference of the first polarization-maintaining coupler 8 output
Light is exported from output optical fibre 17 to detector.
Specifically, light source is LD light sources, and optical fiber 14, optical fiber 15 are single mode optical fiber, will when sensing optic cable 16 is disturbed
Cause optical fiber 14, the first polarised light on optical fiber 15, the second polarised light light path variation, can be by light by interference effect
Journey change transitions are the variation of interference light intensity, so as to which detector detects corresponding interference output by output optical fibre 17, are realized
Monitoring to circuit disturbance situation is such as suitable for sensing optic cable 16 being laid on the fence of circumference.Experiment show system from
The influence of single mode optical fiber polarization state, clear-cut texture degree is close to 100%.
The utility model 3rd embodiment employs the combination of single mode optical fiber and faraday rotation mirror, eliminates single mode optical fiber
Influence of the upper polarization variations to interference, thus sensed especially suitable for long-distance distributed optical fiber, such as it is used for fiber communication link
Monitoring, long range circumference, oil, the fields such as Safety monitoring of natural gas line.
The principles and effects of the application is only illustrated in above-described embodiment, not for limitation the application.It is any ripe
Know the personage of this technology all can without prejudice to spirit herein and under the scope of, modifications and changes are carried out to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from spirit disclosed herein and institute under technological thought such as
Into all equivalent modifications or change, should be covered by claims hereof.
Claims (10)
1. a kind of M-Z optical interference circuit structures for having the function of that all risk insurance is inclined, which is characterized in that including light splitting device (3), first
Polarization-maintaining transferring device (4), the first faraday rotation mirror (5), the second polarization-maintaining transferring device (6), the second faraday rotation mirror (7),
First polarization-maintaining coupler (8)；
The light splitting device (3) is used to receive the light of light source input, and export the first consistent polarised light of polarization state and
Second polarised light；
The first polarization-maintaining transferring device (4) includes first port, second port, third port, the first polarization-maintaining transfer dress
The first port for putting (4) receives first polarised light of light splitting device (3) output, the first polarization-maintaining transfer dress
The second port for putting (4) is connected with first faraday rotation mirror (5), the 3rd end of the first polarization-maintaining transferring device (4)
Mouth is connected with the first port of first polarization-maintaining coupler (8), wherein, the first end of the first polarization-maintaining transferring device (4)
Mouthful between the light splitting device (3), the third port of the first polarization-maintaining transferring device (4) and the first polarization-maintaining coupling
The optical fiber being connected between the first port of clutch (8) is polarization maintaining optical fibre；
The second polarization-maintaining transferring device (6) includes first port, second port, third port, the second polarization-maintaining transfer dress
The first port for putting (6) receives second polarised light of light splitting device (3) output, the second polarization-maintaining transfer dress
The second port for putting (6) is connected with second faraday rotation mirror (7), the 3rd end of the second polarization-maintaining transferring device (6)
Mouth is connected with the second port of first polarization-maintaining coupler (8), wherein, the first end of the second polarization-maintaining transferring device (6)
Mouthful between the light splitting device (3), the third port of the second polarization-maintaining transferring device (6) and the first polarization-maintaining coupling
The optical fiber being connected between the second port of clutch (8) is polarization maintaining optical fibre.
2. there is the inclined M-Z optical interference circuit structures of all risk insurance as described in claim 1, which is characterized in that the M-Z interference
Light channel structure further includes injection fibre (9), and the light of the light source input is linearly polarized light, and the injection fibre (9) is polarization-maintaining light
Fibre, the linearly polarized light input the light splitting device along the polarization principal axis of the working-spindle of the injection fibre (9)
(3)。
3. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that the polarization
Light-dividing device (3) is polarization-maintaining beam splitter.
4. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that the polarization
Light-dividing device (3) is polarization-maintaining coupling device.
5. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 4, which is characterized in that the polarization point
Electro-optical device (3) is the polarization-maintaining coupling device uniaxially or biaxially to work.
6. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that described first
Polarization-maintaining transferring device (4) and the second polarization-maintaining transferring device (6) are polarization beam apparatus, the first polarization-maintaining transferring device
(4) first port and third port is partial wave port, and the second port of the first polarization-maintaining transferring device (4) is multiplex end
Mouthful, the first port and third port of the second polarization-maintaining transferring device (6) are partial wave ports, the second polarization-maintaining transferring device
(6) second port is multiplex port.
7. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that described first
Polarization-maintaining transferring device (4) and the second polarization-maintaining transferring device (6) use 90 ° of polarization-maintaining welding.
8. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that described first
Polarization-maintaining transferring device (4) includes the first polarization-maintaining circulator (41), the first polarizer (42), the first polarization-maintaining circulator (41)
First port receives first polarised light of light splitting device (3) output, the first polarization-maintaining circulator (41)
Second port is connected with first faraday rotation mirror (5), the third port of the first polarization-maintaining circulator (41) with it is described
First polarizer (42) is connected, and first polarizer (42) is connected with the first port of first polarization-maintaining coupler (8),
In, between the first port of the first polarization-maintaining circulator (41) and the light splitting device (3), first polarization-maintaining annular
Between the third port of device (41) and first polarizer (42), first polarizer (42) couples with first polarization-maintaining
The optical fiber being connected between the first port of device (8) is polarization maintaining optical fibre；
The second polarization-maintaining transferring device (6) includes the second polarization-maintaining circulator (61), the second polarizer (62), second polarization-maintaining
The first port of circulator (61) receives second polarised light of light splitting device (3) output, second polarization-maintaining
The second port of circulator (61) is connected with second faraday rotation mirror (7), and the of the second polarization-maintaining circulator (61)
Three ports are connected with second polarizer (62), and the of second polarizer (62) and first polarization-maintaining coupler (8)
Two-port netwerk is connected, wherein, between the first port of the second polarization-maintaining circulator (61) and the light splitting device (3), institute
It states between the third port of the second polarization-maintaining circulator (61) and second polarizer (62), second polarizer (62) and institute
It is polarization maintaining optical fibre to state the optical fiber being connected between the second port of the first polarization-maintaining coupler (8).
9. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that described first
Between the second port of polarization-maintaining transferring device (4) and first faraday rotation mirror (5), the second polarization-maintaining transferring device
(6) optical fiber being connected between second port and second faraday rotation mirror (7) is wrapped up by sensing optic cable (16).
10. there is the inclined M-Z optical interference circuit structures of all risk insurance as claimed in claim 1 or 2, which is characterized in that described
One polarization-maintaining coupler (8) is two-way or multi-channel optical fiber coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721508604.2U CN207423216U (en) | 2017-11-10 | 2017-11-10 | A kind of M-Z optical interference circuit structures for having the function of that all risk insurance is inclined |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721508604.2U CN207423216U (en) | 2017-11-10 | 2017-11-10 | A kind of M-Z optical interference circuit structures for having the function of that all risk insurance is inclined |
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| CN207423216U true CN207423216U (en) | 2018-05-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741244A (en) * | 2017-11-10 | 2018-02-27 | 广东复安科技发展有限公司 | A kind of M Z optical interference circuit structures with the inclined function of all risk insurance |
| WO2019090706A1 (en) * | 2017-11-10 | 2019-05-16 | 广东复安科技发展有限公司 | Mach-zehnder interference optical path structure having full polarization maintenance function |
| US11493693B2 (en) | 2017-11-10 | 2022-11-08 | Guangdong Fu'an Technology Development Co., Ltd. | M-Z interface light path structure with all polarization-maintaining function |
-
2017
- 2017-11-10 CN CN201721508604.2U patent/CN207423216U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741244A (en) * | 2017-11-10 | 2018-02-27 | 广东复安科技发展有限公司 | A kind of M Z optical interference circuit structures with the inclined function of all risk insurance |
| WO2019090706A1 (en) * | 2017-11-10 | 2019-05-16 | 广东复安科技发展有限公司 | Mach-zehnder interference optical path structure having full polarization maintenance function |
| US11493693B2 (en) | 2017-11-10 | 2022-11-08 | Guangdong Fu'an Technology Development Co., Ltd. | M-Z interface light path structure with all polarization-maintaining function |
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