CN106383380B - Faraday rotation reflector and fibre optic interferometer - Google Patents
Faraday rotation reflector and fibre optic interferometer Download PDFInfo
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- CN106383380B CN106383380B CN201611112526.4A CN201611112526A CN106383380B CN 106383380 B CN106383380 B CN 106383380B CN 201611112526 A CN201611112526 A CN 201611112526A CN 106383380 B CN106383380 B CN 106383380B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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Abstract
The present invention provides a kind of Faraday rotation reflector and fibre optic interferometers, belong to fibre coherence technique field.The Faraday rotation reflector includes: that collimator, polarizing beam splitter, Faraday rotator, light regulator and commutation optical fiber, polarizing beam splitter are set between collimator and Faraday rotator, and light regulator is set between Faraday rotator and commutation optical fiber.Faraday rotation reflector provided by the invention realizes the exchange of the first linearly polarized light of polarizing beam splitter output and the transmission path of the second linearly polarized light by the optical fiber that commutates, the polarized component generated is influenced by the dispersion characteristics and temperature characterisitic of Faraday rotator to eliminate using polarizing beam splitter, it effectively ensures the light beam being emitted by Faraday rotation reflector and has rotated 90 degree compared to the polarization direction of incident beam, do not influenced by environment temperature and lambda1-wavelength.In addition, the present invention also provides a kind of fibre optic interferometers using above-mentioned Faraday rotation reflector.
Description
Technical field
The present invention relates to fibre coherence technique fields, dry in particular to a kind of Faraday rotation reflector and optical fiber
Interferometer.
Background technique
Interference formula demodulation method resolving power with higher, is widely used in the demodulation of optical signal.Compared to biography
The interferometer that the lens system of system is constituted, fibre optic interferometer have small in size, light weight, electromagnetism interference, anticorrosion, sensitivity
High, the advantages that Measurement bandwidth is wider, detection electronic equipment and sensor distance is far, measure pressure, stress (strain), magnetic field,
Refractive index, micro-vibration, micro-displacement etc. have important application.
In order to avoid there are polarization decays for fibre optic interferometer, the output of interference signal is influenced, usually in fibre optic interferometer
It is respectively provided with Faraday rotator on two fiber optic interferometric arms, so that the polarization direction for the light being reflected back from two fiber optic interferometric arms
It is rotated by 90 °, to improve the signal-to-noise ratio of fibre optic interferometer.However, the light due to different wave length passes through after Faraday rotator
Polarization direction rotation angle it is different, only in its center at wavelength, the rotation angle of the polarization direction of light is just 90 degree.And
The central wavelength of Faraday rotator can change with the variation of environment temperature.That is, in certain signal light spectrum models
The oil exploration in wider application or in the biggish application environment of some temperature difference in such as desert is enclosed, by farad
After rotator is applied to fibre optic interferometer, due to Faraday rotator intrinsic dispersion and temperature characterisitic, so that two interference
The polarization state for the light beam that arm returns is different, is unfavorable for alleviating the polarization decay of fibre optic interferometer, is also unfavorable for improving fiber optic interferometric
The signal-to-noise ratio of instrument, to also limit application of the Faraday rotator in fibre optic interferometer.
Summary of the invention
In view of this, it is an object of the present invention to provide a kind of Faraday rotation reflector and fibre optic interferometer, with
Effectively improve the above problem.
To achieve the goals above, The technical solution adopted by the invention is as follows:
On the one hand, the embodiment of the invention provides a kind of Faraday rotation reflectors, comprising: collimator, polarizing beam splitter,
Faraday rotator, light regulator and commutation optical fiber.The polarizing beam splitter is set to the collimator and the faraday is revolved
Turn between device, the light regulator is set between the Faraday rotator and the commutation optical fiber.The polarizing beam splitter
Incident light beam splitting for that will pass through the collimator collimation is the first linearly polarized light and the second linearly polarized light, and the First Line is inclined
The polarization direction of vibration light and second linearly polarized light is mutually perpendicular to.The Faraday rotator is used to make incident described first
The polarization direction of linearly polarized light and second linearly polarized light rotates predetermined angle.The commutation optical fiber includes first end and
Two ends, the light regulator are used to for incident first linearly polarized light being coupled to the first end of the commutation optical fiber, will enter
Second linearly polarized light penetrated is coupled to the second end of the commutation optical fiber, and to be brought out by the second of the commutation optical fiber
The first linearly polarized light penetrated along second linearly polarized light path reverse transfer so that first bringing out by the commutation optical fiber
Path reverse transfer of the second linearly polarized light penetrated along first linearly polarized light.
In preferred embodiments of the present invention, the light regulator includes that convergent lens and setting are remote in the convergent lens
The capillary of side from the Faraday rotator.The commutation optical fiber include the first optical fiber and the second optical fiber, described first
One end of optical fiber is the first end of the commutation optical fiber, one end company of the other end of first optical fiber and second optical fiber
It connects, the other end of second optical fiber is the second end of the commutation optical fiber.First optical fiber and second optical fiber are arranged side by side
It is embedded in the capillary, the first end and second end of the commutation optical fiber is towards the convergent lens.
In preferred embodiments of the present invention, first optical fiber and second optical fiber are polarization maintaining optical fibre to be maintained at
The polarization direction of the first linearly polarized light and the second linearly polarized light that are transmitted in the commutation optical fiber.
In preferred embodiments of the present invention, it is incident on the polarization of the first linearly polarized light of the first end of the commutation optical fiber
Direction and the polarization direction of the second linearly polarized light of first end for being incident on the commutation optical fiber are located at the commutation light
Fine major axes orientation.
In preferred embodiments of the present invention, the second end of the first end of the commutation optical fiber and the commutation optical fiber is located at
In same plane.
In preferred embodiments of the present invention, the light regulator further includes shell, and the shell is provided with light admission port, institute
It states convergent lens and the capillary is all set in the shell.
In preferred embodiments of the present invention, the Faraday rotator is set to the first of the polarizing beam splitter output
In the transmission path of linearly polarized light or the second linearly polarized light.
In preferred embodiments of the present invention, the Faraday rotator is set to the first of the polarizing beam splitter output
In the transmission path of linearly polarized light and the second linearly polarized light.
In preferred embodiments of the present invention, the polarizing beam splitter is wollaston prism.
On the other hand, the embodiment of the invention also provides a kind of fibre optic interferometers, including the first fiber optic interferometric arm and second
Above-mentioned Faraday rotation reflection is respectively provided on fiber optic interferometric arm, the first fiber optic interferometric arm and the second fiber optic interferometric arm
Device.The first light beam of the Faraday rotation reflector is transferred to along the first fiber optic interferometric arm, through the Faraday rotation
It is reversely exported after reflector reflection along the first fiber optic interferometric arm, is transferred to the faraday along the second fiber optic interferometric arm
Second light beam of rotoflector, it is reversely defeated along the second fiber optic interferometric arm after Faraday rotation reflector reflection
Out.
Faraday rotation reflector provided in an embodiment of the present invention passes through design polarizing beam splitter, Faraday rotator, light
Adjuster and commutation optical fiber, so that orthogonal first linearly polarized light in polarization direction and the second line that are exported through polarizing beam splitter
The polarization direction of polarised light returns after turning 90 degrees partially, and realizes the first linearly polarized light and the second linearly polarized light by commutation optical fiber
Transmission path exchange, to eliminate the dispersion characteristics and temperature characterisitic by Faraday rotator using polarizing beam splitter
The polarized component generated is influenced, effectively ensures the light beam being emitted by Faraday rotation reflector compared to incident light beam
Polarization direction has rotated 90 degree, is not influenced by environment temperature and lambda1-wavelength.Further, it reduces using this faraday
Requirement of the fibre optic interferometer of rotoflector to lambda1-wavelength and operating ambient temperature is conducive to improve fibre optic interferometer
Signal-to-noise ratio.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is knot of the Faraday rotation reflector that provides of first embodiment of the invention in the first specific embodiment
Structure schematic diagram；
Fig. 2 is knot of the Faraday rotation reflector that provides of first embodiment of the invention in second of specific embodiment
Structure schematic diagram；
Fig. 3 is knot of the Faraday rotation reflector that provides of first embodiment of the invention in the third specific embodiment
Structure schematic diagram；
Fig. 4 is the light regulator for the Faraday rotation reflector that first embodiment of the invention provides in a kind of specific embodiment party
Structural schematic diagram in formula；
Fig. 5 is the E-E sectional view of Fig. 4；
Fig. 6 is light of the Faraday rotation reflector that provides of first embodiment of the invention in the first specific embodiment
Transmission direction schematic diagram；
Fig. 7 is the structural schematic diagram for the fibre optic interferometer that second embodiment of the invention provides.
In figure: 1- fibre optic interferometer；100- Faraday rotation reflector；110- collimator；120- polarizing beam splitter；130-
Faraday rotator；140- magnetic field generator；150- light regulator；151- shell；1511- light admission port；152- convergent lens；
153- capillary；154- viscose glue；160- commutation optical fiber；160a- first end；160b- second end；The first optical fiber of 161-；161m-
One opal；The second optical fiber of 162-；The second opal of 162m-；200- fiber coupler；301- the first fiber optic interferometric arm；302- second
Fiber optic interferometric arm.
Specific embodiment
In order to avoid there are polarization decays for fibre optic interferometer, the output of interference signal is influenced, usually in fibre optic interferometer
It is respectively provided with Faraday rotator on two fiber optic interferometric arms, so that the polarization direction for the light being reflected back from two fiber optic interferometric arms
It is rotated by 90 °, to improve the signal-to-noise ratio of fibre optic interferometer.However, the light due to different wave length passes through after Faraday rotator
Polarization direction rotation angle it is different, only in its center at wavelength, the rotation angle of the polarization direction of light is just 90 degree.And
The central wavelength of Faraday rotator can change with the variation of environment temperature.That is, in certain signal light spectrum models
The oil exploration in wider application or in the biggish application environment of some temperature difference in such as desert is enclosed, by farad
After rotator is applied to fibre optic interferometer, due to Faraday rotator intrinsic dispersion and temperature characterisitic, so that two interference
The polarization state for the light beam that arm returns is different, reduces so as to cause the signal-to-noise ratio of fibre optic interferometer, also limits Faraday rotation
Application of the device in fibre optic interferometer.
In consideration of it, the embodiment of the invention provides a kind of Faraday rotation reflectors, to efficiently solve lambda1-wavelength
And ambient temperature effect light beam polarization direction rotation angle the problem of, advantageously reduce fibre optic interferometer to lambda1-wavelength and
The requirement of operating ambient temperature is conducive to application of the Faraday rotation reflector in fibre optic interferometer.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Usually herein
The component of the embodiment of the present invention described and illustrated in place's attached drawing can be arranged and be designed with a variety of different configurations.Therefore,
The model of claimed invention is not intended to limit to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
It encloses, but is merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, or be somebody's turn to do
Invention product using when the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.In addition, term " first ", " second " etc. are only used for distinguishing description, and should not be understood as referring to
Show or imply relative importance.
In addition, the terms such as term "horizontal", "vertical", " vertical " are not offered as requiring component abswolute level or vertical, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
First embodiment
As shown in Figure 1, Faraday rotation reflector 100 provided in this embodiment includes collimator 110, polarizing beam splitter
120, Faraday rotator 130, light regulator 150 and commutation optical fiber 160.Polarizing beam splitter 120 is set to collimator 110 and method
It draws between rotator 130, light regulator 150 is set between Faraday rotator 130 and commutation optical fiber 160.
Wherein, collimator 110 to incident light for being collimated, being converted to the outgoing of less parallel light.It is understood that
Faraday rotation reflector 100 is usually applied in fibre optic interferometer, at this point, the incidence end of Faraday rotation reflector 100 with
The fiber optic interferometric arm of fibre optic interferometer couples.
Polarizing beam splitter 120 will be for that will be the first linearly polarized light and second by the incident light beam splitting that collimator 110 collimates
Linearly polarized light.Wherein, the polarization direction of the first linearly polarized light and second linearly polarized light is mutually perpendicular to.Polarizing beam splitter 120
It can be birefringece crystal, for example, calcite, or the wollaston prism being made of two birefringece crystals.Certainly,
Polarizing beam splitter 120 be also possible to it is other incident beam can be decomposed into polarization direction be mutually perpendicular to and exit direction have it is certain
The structure of two bunch polarised lights of angle.
Faraday rotator 130 is used to that the polarization direction of incident the first linearly polarized light and the second linearly polarized light to be made to rotate
Predetermined angle.As an implementation, as shown in Figure 1, Faraday rotator 130 is set to the output of polarizing beam splitter 120
In the transmission path of first linearly polarized light and the second linearly polarized light.At this point, predetermined angle is 45 °.As another embodiment,
Faraday rotator 130 is set in the transmission path of the first linearly polarized light of the output of polarizing beam splitter 120, as shown in Fig. 2, or
Person, Faraday rotator 130 is set in the transmission path of the second linearly polarized light of the output of polarizing beam splitter 120, such as Fig. 3 institute
Show.At this point, above-mentioned predetermined angle is 90 °.Faraday rotator 130 is placed in a magnetic field generator 140.Magnetic field generator
140 can be the iron core for being externally wrapped with coil, magnetic field can be generated in iron core after coil is powered.Preferably, above-mentioned iron core
For annular core.In addition, magnetic field generator 140 is also possible to that the permanent magnet of fixed magnetic field can be generated.Magnetic field generator 140 produces
Raw magnetic fields are on Faraday rotator 130, so that the polarization direction rotation of the light beam by Faraday rotator 130
45 ° or 90 °.
The above two embodiment of Faraday rotator 130 the difference is that, when using the faraday for rotating 45 °
Rotator 130, the first linearly polarized light and the second linearly polarized light are required to that could be made by Faraday rotator 130 twice
The polarization direction of one linearly polarized light and the second linearly polarized light is rotated by 90 °；When using the Faraday rotator 130 that is rotated by 90 °, the
One linearly polarized light and the second linearly polarized light need to only pass through a Faraday rotator 130, so that it may so that the first linearly polarized light and
The polarization direction of second linearly polarized light is rotated by 90 °.The effect as caused by both embodiments is identical, in the present embodiment
Do not illustrate one by one.In the following description, it is illustrated in case where using the Faraday rotator 130 for rotating 45 °.
The optical fiber 160 that commutates includes first end 160a and second end 160b.It should be noted that first end 160a and second end
160b is respectively two end faces of optical fiber.First Line of the light regulator 150 for will be incident after above-mentioned polarization rotator is inclined
The first end 160a to shake optically coupling to commutation optical fiber 160, by incident the second linear polarization optocoupler after above-mentioned polarization rotator
Close the second end 160b of the commutation optical fiber 160.Exist from the first linearly polarized light of the first end 160a incidence of commutation optical fiber 160
The interior transmission of the optical fiber 160 that commutates, from the second end 160b outgoing of commutation optical fiber 160.It is incident from the second end 160b of commutation optical fiber 160
The second linearly polarized light commutation optical fiber 160 in transmit, from commutation optical fiber 160 first end 160a outgoing.Hereafter, by commutation light
Fibre 160 second end 160b outgoing the first linearly polarized light along the second linearly polarized light path reverse transfer, by commutation optical fiber 160
First end 160a outgoing the second linearly polarized light along the first linearly polarized light path reverse transfer.That is, the present embodiment
In, commutation optical fiber 160 approximate can be arranged in U-typed, can realize First Line by light regulator 150 and commutation optical fiber 160
The exchange of the transmission path of polarised light and the second linearly polarized light.
Fig. 4 shows structural schematic diagram of the three-dimensional light regulator on the X/Y plane in three-dimensional cartesian coordinate system (X, Y, Z).
As shown in figure 4, light regulator 150 may include shell 151, convergent lens in a kind of specific embodiment of the present embodiment
152 and the capillary 153 of side of the convergent lens 152 far from Faraday rotator 130 is set.Shell 151 is provided with light passing
Mouth 1511, convergent lens 152 and capillary 153 are all set in shell 151.The light admission port 1511 is used to penetrate light beam.
At this point, commutation optical fiber 160 may include the first optical fiber 161 and the second optical fiber 162, one end of the first optical fiber 161 is
For the first end 160a of above-mentioned commutation optical fiber 160, the other end of the first optical fiber 161 is connect with one end of second optical fiber 162,
The other end of second optical fiber 162 is the second end 160b of commutation optical fiber 160, the first optical fiber 161 and the second insertion side by side of optical fiber 162
In capillary 153, and the first end 160a and second end 160b for the optical fiber 160 that commutates are towards convergent lens 152.In order to fix
The position of one optical fiber 161 and the second optical fiber 162 in the one end of capillary 153 far from convergent lens 152 and can be pierced by capillary
Viscose glue 154 is coated between 153 the first optical fiber 161 and the second optical fiber 162.First optical fiber 161 as a preferred implementation manner,
It may belong to same root optical fiber with the second optical fiber 162, i.e. what the first optical fiber 161 and the second optical fiber 162 were one of the forming.Certainly,
First optical fiber 161 and the second optical fiber 162 are also possible to mutually independent two optical fiber, the other end of the first above-mentioned optical fiber 161
One end welding with second optical fiber 162 forms commutation optical fiber 160.
It is set on shell 151 at this point, the first linearly polarized light and the second linearly polarized light that are emitted by Faraday rotator 130 penetrate
The light admission port 1511 set is incident on convergent lens 152, and the first linearly polarized light is converged to commutation optical fiber by the convergent lens 152
160 first end 160a enter commutation optical fiber 160, by the second linearly polarized light converge to commutation optical fiber 160 second end 160b into
Enter to commutate optical fiber 160.
Further, the process in order to keep the first linearly polarized light and the second linearly polarized light to transmit in commutation optical fiber 160
In polarization state do not change, above-mentioned commutation optical fiber 160 is polarization maintaining optical fibre, i.e. the first optical fiber and the second optical fiber 162 are to protect
Polarisation is fine.And it is incident on the polarization direction of the first linearly polarized light of the first end 160a of commutation optical fiber 160 and is incident on commutation
The polarization direction of the second linearly polarized light of the second end 160b of optical fiber 160 is located at the major axes orientation of commutation optical fiber 160.This reality
It applies in example, the first optical fiber 161 and the second optical fiber 162 can be " panda eye " polarization maintaining optical fibre, " butterfly " polarization maintaining optical fibre etc..For example,
When the first optical fiber 161 and the second optical fiber 162 are " panda eye " polarization maintaining optical fibre, it is embedded in the cat of the first optical fiber 161 of capillary 153
Line between eye is parallel with the line between the opal of the second optical fiber 162.Fig. 5 shows the E-E sectional view of Fig. 4, i.e., three-dimensional
The sectional view in YZ plane in rectangular coordinate system (X, Y, Z).Further, for the ease of convergent lens 152 that First Line is inclined
Vibration light converges to the first end 160a of commutation optical fiber 160, and the second linearly polarized light is converged to the second end of commutation optical fiber 160
160b, as shown in figure 5, the second cat of the first opal 161m of the first optical fiber 161 of insertion capillary 153 and the second optical fiber 162
Eye 162m is arranged in the horizontal direction.Wherein, horizontal direction is the Z-direction in Fig. 5.Preferably, the first end of commutation optical fiber 160
The second end 160b of 160a and commutation optical fiber 160 is in the same plane, that is, is respectively positioned in YZ plane.
It should be noted that the shell 151 of light regulator 150 can be preferably by glass or metal material in the present embodiment
It is made, capillary 153 can be preferably glass capillary.Certainly, shell 151 and capillary 153 can also use other materials
It is made, the present embodiment is with no restriction.
It, below will be to Faraday rotation reflector provided in this embodiment for the clearer scheme for illustrating the present embodiment
100 course of work is further described.For using wollaston prism as polarizing beam splitter 120.
As shown in fig. 6, the incident beam 10 of random polarization state enters collimator 110 along conduction optical fiber, by collimator 110
The light beam being emitted after collimation is denoted as light beam 12.Light beam 12 continues to propagate the one end for being incident on polarizing beam splitter 120.According to polarization point
The crystal property of light device 120, the light beam of random polarization state enter after polarizing beam splitter 120, are decomposed to form the first linearly polarized light
With the second linearly polarized light.The polarization direction of this two bunch polarised light is mutually perpendicular to, and is generally termed ordinary light (o light) and extraordinary ray
(e light), this two-beam can be propagated in different directions in polarizing beam splitter 120.As shown in fig. 6, polarizing beam splitter 120 will
Incident light beam 12 is decomposed into the o light 14 and e light 16 being emitted from different directions.It should be noted that label 10 in Fig. 6 is to mark
Numbers 26 and corresponding arrow be only used for the transmission direction of signal light beam, be not offered as actual light beam.
At this point, o light 14 passes through polarizing beam splitter 120 along optical path 1A, it is emitted from position D1.O after position D1 outgoing
The continuation of light 14 is propagated forward, and Faraday rotator 130 is incident on.After Faraday rotator 130, the polarization direction of o light 14
45 ° of rotation.The light beam being emitted from Faraday rotator 130 is denoted as light beam 18.
The polarization direction of e light 16 is vertical with the polarization direction of o light 14, and e light 16 passes through polarizing beam splitter along optical path 1B
120, it is emitted from position D2.It is propagated forward from the continuation of e light 16 after position D2 outgoing, is incident on Faraday rotator 130.By
After Faraday rotator 130, the polarization direction of e light 16 rotates 45 °.The light beam being emitted from Faraday rotator 130 is denoted as light
Beam 20.
Light beam 18 and light beam 20 continue to propagate at the different location for the convergent lens 152 being incident in light regulator 150, light
Enter the first end 160a of commutation optical fiber 160 after the convergence of the concentrated lens 152 of beam 18, after the convergence of the concentrated lens 152 of light beam 20
Into the second end 160b of commutation optical fiber 160, to realize that optical path is exchanged.After the second end 160b outgoing of commutation optical fiber 160
Light beam 18 along light beam 20 incident path backpropagation, by commutation optical fiber 160 first end 160a outgoing after light beam 20
Along the incident path backpropagation of light beam 18.
Light beam 18 continues the incident path backpropagation along light beam 20 after being emitted again by convergent lens 152, again pass by
Faraday rotator 130, polarization direction deflect 45 ° again, and light beam 18 is again passed by the light after Faraday rotator 130 is emitted
Shu Jiwei light beam 22.Similarly, continue reversely to pass along the incident path of light beam 18 after light beam 20 is emitted by convergent lens 152 again
It broadcasts, again passes by Faraday rotator 130, polarization direction deflects 45 ° again, and light beam 20 is again passed by Faraday rotator
Light beam after 130 outgoing is denoted as light beam 24.It is understood that the polarization direction of light beam 22 deflects compared to light beam 14
90°；Compared to light beam 16, the polarization direction of light beam 24 has also deflected 90 °.Light beam 22 enters polarizing beam splitter 120 along optical path 1B,
And the direction of propagation of light beam 22 and light beam 16 the direction of propagation on the contrary, and light beam 24 along optical path 1A enters polarizing beam splitter 120, and
The direction of propagation of light beam 24 is opposite with the direction of propagation of light beam 14.
As the above analysis, the o light 14 that polarizing beam splitter 120 is emitted is converted to e light, and along the propagation of e light 16
Path returns to the eye point D2 of polarizing beam splitter 120, and the e light 16 that polarizing beam splitter 120 is emitted is converted to o light, and along o
The propagation path of light 14 returns to the eye point D1 of polarizing beam splitter 120.The synthesis light beam of this two-beam goes out from polarizing beam splitter 120
It penetrates, after collimator 110, is denoted as light beam 26.Since the polarization direction of this two-beam realizes exchange, emergent light
The polarization direction of beam 26 is vertical with the polarization direction of incident beam 10.
In the above process, polarizing beam splitter 120 can be equivalent to the filter of Faraday rotation angle, can eliminate by method
The polarized component drawing the influence of the dispersion characteristics and temperature characterisitic of rotator 130 and generating.Specifically, since faraday is revolved
Turning device 130, there are dispersions and temperature characterisitic, can not all be rotated by 90 ° the polarization direction of all light for passing twice through it.And
Polarizing beam splitter 120 allow for its o light 14 and e light 16 that are emitted, and the light that polarization direction just has rotated 90 ° is logical
It crosses.That is, only polarization direction, could be along polarizing beam splitter perpendicular to the light of the optical axis direction of polarizing beam splitter 120
Optical path 1A backpropagation in 120, can reach collimator 110 after outgoing, only polarization direction is parallel to polarizing beam splitter 120
The light of optical axis direction could can reach collimator 110 along the optical path 1B backpropagation in polarizing beam splitter 120 after outgoing.Example
Such as, certain light beam is incident on the position D1 of polarizing beam splitter 120 along direction identical with light beam 24, due to Faraday rotator 130
Error so that the polarization direction after Faraday rotator 130 is vertical with 120 optical axis of polarizing beam splitter twice by this Shu Guang
There is small 1 ° of angle in direction.At this point, only polarization direction is perpendicular to polarizing beam splitter in the electric field intensity of this Shu Guang
The polarized component of 120 optical axis could travel to collimator 110 along the path of 1A back through polarizing beam splitter 120.
In conclusion making the deflection direction of incident light although Faraday rotator 130 is influenced by dispersion and temperature characterisitic
Rotation angle shift, Faraday rotation reflector 100 provided in an embodiment of the present invention enables to outgoing beam 26
Polarization direction always perpendicular to the polarization direction of incident beam 10, restrained effectively the dispersion and temperature of Faraday rotator 130
Influence of the characteristic to the polarization direction of outgoing beam 26 is spent, advantageously reduces fibre optic interferometer to lambda1-wavelength and working environment
The requirement of temperature is conducive to application of the Faraday rotation reflector 100 in fibre optic interferometer.
Second embodiment
Present embodiments provide a kind of fibre optic interferometer.As shown in fig. 7, the fibre optic interferometer 1 includes fiber coupler
200, the first fiber optic interferometric arm 301 and the second fiber optic interferometric arm 302, the first fiber optic interferometric arm 301 and the second fiber optic interferometric arm 302
On be provided with the Faraday rotation reflector 100 that above-mentioned first embodiment provides.Wherein, Faraday rotation reflector 100
Specific structure and principle please refer to above-mentioned first embodiment, and details are not described herein again.
Fiber coupler 200 can use splitting ratio for 2 × 2 fiber couplers of 50:50.The fiber coupler 200 packet
Include the first connecting pin a, second connection end b, third connecting pin c and the 4th connecting pin d.Signal light is by the of fiber coupler 200
One connecting pin a enters, and is divided into light intensity equal the first light beam and the second light beam.First light beam is incident on by third connecting pin c
One fiber optic interferometric arm 301 is transferred to Faraday rotation reflector 100 along the first fiber optic interferometric arm 301, reflects through Faraday rotation
Device 100 reversely exports after reflecting along the first fiber optic interferometric arm 301.Second light beam, which is incident on the second optical fiber by the 4th connecting pin d, to be done
Arm 302 is related to, the second light beam of Faraday rotation reflector 100 is transferred to along the second fiber optic interferometric arm 302, it is anti-through Faraday rotation
Emitter 100 reversely exports after reflecting along the second fiber optic interferometric arm 302.At this point, reversely exported along the first fiber optic interferometric arm 301
One light beam is mutually perpendicular to the polarization direction by the first incident light beam of the first fiber optic interferometric arm 301, along the second fiber optic interferometric arm
302 the second light beams reversely exported are mutually perpendicular to the polarization direction by the second incident light beam of the second fiber optic interferometric arm 302.Edge
The first light beam that first fiber optic interferometric arm 301 reversely exports enters fiber coupler 200 by third connecting pin c, along the second optical fiber
The second light beam that interfere arm 302 reversely exports enters fiber coupler 200 by the 4th connecting pin d, interferes to form interference letter
Number, it is exported by the second connection end b of fiber coupler 200.
Fibre optic interferometer 1 provided in an embodiment of the present invention, the Faraday rotation provided using above-mentioned first embodiment are anti-
Emitter 100 is effectively eliminated on the basis of reducing requirement of the fibre optic interferometer 1 to lambda1-wavelength and operating ambient temperature
Polarization decay problem existing for existing fiber interferometer improves the signal-to-noise ratio of output interference signal.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of Faraday rotation reflector characterized by comprising collimator, polarizing beam splitter, Faraday rotator, light
Adjuster and commutation optical fiber, the polarizing beam splitter are set between the collimator and the Faraday rotator, the light
Adjuster is set between the Faraday rotator and the commutation optical fiber；
The polarizing beam splitter will be for that will be the first linearly polarized light and the second line by the incident light beam splitting of collimator collimation
The polarization direction of polarised light, first linearly polarized light and second linearly polarized light is mutually perpendicular to；
The Faraday rotator is used to make the polarization direction of incident first linearly polarized light and second linearly polarized light
Rotate predetermined angle；
The commutation optical fiber includes first end and second end, and the light regulator is used for incident the first linearly polarized light coupling
Incident second linearly polarized light is coupled to the second end of the commutation optical fiber by the first end for closing the commutation optical fiber,
And the first linearly polarized light of the second end outgoing by the commutation optical fiber is reversely passed along the path of second linearly polarized light
It is defeated, so that reversely being passed by the second linearly polarized light of the first end outgoing of the commutation optical fiber along the path of first linearly polarized light
It is defeated；
Wherein, the light regulator includes convergent lens and one of the convergent lens far from the Faraday rotator is arranged in
The capillary of side, the commutation optical fiber include the first optical fiber and the second optical fiber, and one end of first optical fiber is the commutation light
Fine first end, the other end of first optical fiber are connect with one end of second optical fiber, the other end of second optical fiber
For the second end of the commutation optical fiber, first optical fiber and second optical fiber are embedded in side by side in the capillary, described to change
To optical fiber first end and second end towards the convergent lens, and first optical fiber and second optical fiber are polarization-maintaining
Optical fiber is to be maintained at the polarization direction of the first linearly polarized light and the second linearly polarized light transmitted in the commutation optical fiber.
2. Faraday rotation reflector according to claim 1, which is characterized in that be incident on the first of the commutation optical fiber
End the first linearly polarized light polarization direction and be incident on it is described commutation optical fiber second end the second linearly polarized light polarization
Direction is located at the major axes orientation of the commutation optical fiber.
3. Faraday rotation reflector according to claim 2, which is characterized in that the first end of the commutation optical fiber and institute
The second end for stating commutation optical fiber is in the same plane.
4. Faraday rotation reflector according to claim 1, which is characterized in that the light regulator further includes shell,
The shell is provided with light admission port, and the convergent lens and the capillary are all set in the shell.
5. Faraday rotation reflector described in any one of -4 according to claim 1, which is characterized in that the Faraday rotation
Device is set in first linearly polarized light of the polarizing beam splitter output or the transmission path of second linearly polarized light.
6. Faraday rotation reflector described in any one of -4 according to claim 1, which is characterized in that the Faraday rotation
Device is set in first linearly polarized light of the polarizing beam splitter output and the transmission path of second linearly polarized light.
7. Faraday rotation reflector according to claim 1, which is characterized in that the polarizing beam splitter is Wollaston
Prism.
8. a kind of fibre optic interferometer, which is characterized in that including the first fiber optic interferometric arm and the second fiber optic interferometric arm, first light
It is provided in fine interfere arm and the second fiber optic interferometric arm as Faraday rotation of any of claims 1-7 is anti-
Emitter is transferred to the first light beam of the Faraday rotation reflector along the first fiber optic interferometric arm, revolves through the faraday
It is reversely exported after turning reflector reflection along the first fiber optic interferometric arm, is transferred to the farad along the second fiber optic interferometric arm
Second light beam of rotoflector, it is reversely defeated along the second fiber optic interferometric arm after Faraday rotation reflector reflection
Out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611112526.4A CN106383380B (en) | 2016-12-06 | 2016-12-06 | Faraday rotation reflector and fibre optic interferometer |
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| CN201611112526.4A CN106383380B (en) | 2016-12-06 | 2016-12-06 | Faraday rotation reflector and fibre optic interferometer |
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| CN110146993A (en) * | 2018-02-13 | 2019-08-20 | 李卫 | A kind of method and apparatus for the biasing of fibre ring interferometer passive phase |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885195A (en) * | 2014-04-11 | 2014-06-25 | 珠海保税区光联通讯技术有限公司 | Faraday rotation reflection mirror and optical fiber interferometer |
| CN104317072A (en) * | 2014-10-13 | 2015-01-28 | 匠研光学科技（上海）有限公司 | Faraday rotating lens irrelevant to wavelength and temperature |
| CN104567959A (en) * | 2015-01-27 | 2015-04-29 | 中国人民解放军国防科学技术大学 | Large-dynamic interference type optical fiber sensor based on two-channel unbalanced interferometer |
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2016
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885195A (en) * | 2014-04-11 | 2014-06-25 | 珠海保税区光联通讯技术有限公司 | Faraday rotation reflection mirror and optical fiber interferometer |
| CN104317072A (en) * | 2014-10-13 | 2015-01-28 | 匠研光学科技（上海）有限公司 | Faraday rotating lens irrelevant to wavelength and temperature |
| CN104567959A (en) * | 2015-01-27 | 2015-04-29 | 中国人民解放军国防科学技术大学 | Large-dynamic interference type optical fiber sensor based on two-channel unbalanced interferometer |
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