CN209343053U - A kind of faraday rotation mirror unrelated with wavelength and temperature - Google Patents
A kind of faraday rotation mirror unrelated with wavelength and temperature Download PDFInfo
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- CN209343053U CN209343053U CN201920161275.1U CN201920161275U CN209343053U CN 209343053 U CN209343053 U CN 209343053U CN 201920161275 U CN201920161275 U CN 201920161275U CN 209343053 U CN209343053 U CN 209343053U
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- faraday rotation
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- temperature
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- 239000013078 crystal Substances 0.000 claims abstract description 57
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Abstract
The utility model provides a kind of faraday rotation mirror unrelated with wavelength and temperature, including optical fiber collimator, birefringent wedge crystal, Faraday rotator and the reflecting mirror being sequentially arranged along optical path, birefringent wedge crystal is inserted between optical fiber collimator and Faraday rotator, eliminate Faraday rotation angle is influenced by wavelength and temperature, and realize product with compact structure, technique is simple, low in cost.
Description
[technical field]
The utility model relates to fiber optic communication and sensory field of optic fibre, especially a kind of farad unrelated with wavelength and temperature
Revolving mirror.
[background technique]
Such as Fig. 1, conventional faraday rotation mirror, by single fiber head 11, collimation lens 12, Faraday rotation piece 3, reflecting mirror
4 compositions.Conventional faraday rotation mirror, does not eliminate the temperature of rotation angle and the mechanism of wavelength relative influence, thus its farad
The rotation angle of revolving fragment is influenced very big by temperature and wavelength.
A kind of fiber birefringence compensating glass, CN102906629A, application number 201180026083.6, and it is a kind of with wavelength and
The unrelated faraday rotation mirror of temperature, CN204241726U, application number 201420703223.X, all by optical fiber head, birefringent crystalline substance
Body, collimation lens, Faraday rotation piece, reflecting mirror composition；Using being inserted into birefringece crystal between optical fiber head and collimation lens
Shifter is influenced although the rotation angle of faraday's revolving fragment can be eliminated by temperature and wavelength, and the position that it is inserted into is in light
Between fine head and lens, what the personnel in this technology industry understood its technique is not easy place, and is not also unfavorable for small-sized
Change；
A kind of faraday rotation unrelated with wavelength and temperature, CN104635347A, application number 201410657273, by optical fiber
Head, collimation lens, the prism of birefringece crystal combination, Faraday rotation piece, reflecting mirror composition；Using in collimation lens and farad
Birefringent crystal prism is inserted between lens, although the rotation angle of faraday's revolving fragment can be eliminated by temperature and the shadow of wavelength
It rings, but because using Birefringent crystal prism, it is with high costs.
[utility model content]
To overcome defect existing for existing product, the utility model lies in that providing a kind of farad unrelated with wavelength and temperature
Revolving mirror is inserted into birefringent wedge crystal between optical fiber collimator and Faraday rotator, eliminates Faraday rotation angle
It is influenced by wavelength and temperature, and realizes product with compact structure, technique is simple, low in cost.
The utility model is realized in this way: a kind of faraday rotation mirror unrelated with wavelength and temperature, including along optical path
Optical fiber collimator, birefringent wedge crystal, Faraday rotator and the reflecting mirror being sequentially arranged；The reflecting mirror and faraday
The light passing surface of rotator is parallel with birefringent wedge crystal right-angle plane；The birefringent wedge crystal includes one and vertical axes
The light passing plane and a right angle light passing plane that the angle of line is α, and its optical axis is located at the incident ray of birefringent wedge crystal
In the plane of normal composition, while the angle of optical axis and horizontal axis is θ；The incident ray and level of birefringent wedge crystal
The angle of axis is β.
Further, the Faraday rotator is Faraday rotation piece.
Further, the birefringent wedge crystal, Faraday rotation piece, reflecting mirror are split type.
Further, the birefringent wedge crystal, Faraday rotation piece, reflecting mirror are monoblock type.
Further, the optical fiber collimator includes single fiber head, collimation lens and glass bushing；The glass sock pipe sleeve
In the outside of the single fiber head and collimation lens, and the collimation lens is located at the rear of the injection light of single fiber head.
Further, the Faraday rotator includes Faraday rotation crystal and externally-applied magnetic field mechanism, the additional magnetic
The magnetic direction that field mechanism applies is parallel to optical direction.
Further, the Faraday rotator is the Faraday rotation crystal of included magnetic, and included magnetic direction is flat
Row is in optical direction.
Further, the reflecting mirror is coated with reflective coating for the rear end face in the Faraday rotation crystal and is formed
Mirror surface.
Further, the reflecting mirror is split type reflecting optics.
Further, the relationship of α, β and θ need to meet following equation:
Wherein, noFor birefringece crystal O optical index, neFor birefringece crystal E optical index, n (θ e) is E light two-fold
Penetrate refractive index when crystal is propagated along wave normal direction, θ e is the angle of E wave normal and horizontal axis, n (θ e) and θ e by with
Lower two equations solve:
Sin (alpha+beta)=n (θ e) sin (α-(θ-θ e)) --- --- --- (2).
Utility model has the advantages that the utility model provides a kind of Faraday rotation unrelated with wavelength and temperature
Mirror, including optical fiber collimator, birefringent wedge crystal, Faraday rotator and the reflecting mirror being sequentially arranged along optical path, in light
It is inserted into birefringent wedge crystal between fine collimator and Faraday rotator, eliminates Faraday rotation angle by wavelength and temperature
It influences, and realizes product with compact structure, technique is simple, low in cost.
[Detailed description of the invention]
The utility model is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structure and light path schematic diagram of faraday rotation mirror conventional in background technique.
Fig. 2 is the structure and light path schematic diagram of faraday rotation mirror described in the utility model.
Fig. 3 is the structure and light path schematic diagram of faraday rotation mirror another kind embodiment described in the utility model.
In figure: 1, optical fiber collimator, 11, single fiber head, 12, collimation lens, 13, glass bushing, 2, birefringent wedge crystalline substance
Body, 21, light passing plane, 22, right angle light passing plane, 23, optical axis, 3, Faraday rotator, 31, reflective coating, 4, reflecting mirror,
100, light beam, the 110, first polarised light, the 111, first the reflected beams, 112, light beam one, 113, the polarization of light beam two, 120, second
Light, the 121, second the reflected beams, 122, light beam three, 123, light beam four.
[specific embodiment]
It please referring to shown in Fig. 2 and Fig. 3, the utility model provides a kind of faraday rotation mirror unrelated with wavelength and temperature,
Including optical fiber collimator 1, birefringent wedge crystal 2, Faraday rotator 3 and the reflecting mirror 4 being sequentially arranged along optical path；It is described
The light passing surface of reflecting mirror 4 and Faraday rotator 3 is parallel with 2 right-angle plane of birefringent wedge crystal；The birefringent wedge
The light passing plane 21 and a right angle light passing plane 22 that angle of the crystal 2 including one and vertical axis is α, and its optical axis 23 is located at
In the plane of incident ray and the normal composition of birefringent wedge crystal 2, while the angle of optical axis 23 and horizontal axis is θ, and θ is
For the azimuth of optical axis 23；The incident ray of birefringent wedge crystal 2 and the angle of horizontal axis are β.
In a specific embodiment: the Faraday rotator 3 is Faraday rotation piece 3.
The birefringent wedge crystal 2, Faraday rotation piece 3, reflecting mirror 4 be it is split type, can be parallel to each other and discrete
In the presence of.
The birefringent wedge crystal 2, Faraday rotation piece 3, reflecting mirror 4 are monoblock type.In specific implementation, the wedge
Shape birefringece crystal 2, Faraday rotation piece 3, reflecting mirror 4 can be bonded into an entirety by glued or bonding technology.
The optical fiber collimator 1 includes single fiber head 11, collimation lens 12 and glass bushing 13；13 sets of the glass bushing
In the outside of the single fiber head 11 and collimation lens 12, and after the collimation lens 12 is located at the injection light of single fiber head 11
Side, and there is a gap.
In a specific embodiment: the Faraday rotator 3 includes Faraday rotation crystal 3 and externally-applied magnetic field mechanism
The magnetic direction of (not shown), the externally-applied magnetic field mechanism application (not shown) is parallel to optical direction.Externally-applied magnetic field mechanism is (not
Diagram) it is the prior art, preferably permanent magnet, permanent magnet ring can also be set in Faraday rotation crystal 3 using induction coil
Outside.
In an another specific embodiment: the Faraday rotator 3 is the Faraday rotation crystal 3 of included magnetic, and from
The magnetic direction of band is parallel to optical direction.
As shown in figure 3, the reflecting mirror 4 be the Faraday rotation crystal 3 rear end face be coated with reflective coating 31 and
The mirror surface of formation, so that reflecting mirror 4 and Faraday rotation crystal 3 constitute an entirety, more compact structure is simply, more sharp
In miniaturization.
The reflecting mirror 4 is split type reflecting optics 4.
The relationship of α, β and θ need to meet following equation:
Wherein, noFor birefringece crystal O optical index, neFor birefringece crystal E optical index, n (θ e) is E light two-fold
Penetrate refractive index when crystal is propagated along wave normal direction, θ e is the angle of E wave normal and horizontal axis, n (θ e) and θ e by with
Lower two equations solve:
Sin (alpha+beta)=n (θ e) sin (α-(θ-θ e)) --- --- --- (2).
, the unit of α, β, θ all uses unified angular unit, such as is all degree.
Working principle is as follows:
As shown in Fig. 2, being propagated from the light beam 100 that optical fiber collimator 1 is emitted along rectangular coordinate system Z axis.It is incident on wedge-shaped double
In refracting crystal 2, it is divided into orthogonal first polarised light 110 in polarization direction and the second polarised light 120.By Faraday rotation
Device 3, corresponding polarization state respectively press 45 ° of rotation clockwise (or counterclockwise), are again incident on the reflection of reflecting mirror 4, and pass through again
Cross Faraday rotator 3, the polarization state of corresponding first the reflected beams 111 and the second the reflected beams 121 is pressed clockwise again
The plane of polarization of (or counterclockwise) 45 ° of rotation, the first the reflected beams 111 and the second the reflected beams 121 is total to be rotated by 90 °.
Wherein, it is stringent with the angle of the plane of polarization of light beam 100 when the first the reflected beams 111 enter birefringent wedge crystal 2
The light beam being rotated by 90 ° is propagated with the beam path of light beam 1, and is assembled and entered via the collimation lens of optical fiber collimator 1 12
Single fiber head 11.And temperature and wavelength dependence energy due to Faraday rotator 3, it is revolved with the angle of the plane of polarization of light beam 100
Turn to deviate 90 ° of light beam to propagate with the beam path of light beam 2 113, from birefringent wedge crystal 2 and vertical axis angle
It is emitted, and cannot be coupled in optical fiber head 11 by the collimation lens 12 of optical fiber collimator 1 for the light passing plane 21 of α.
When second the reflected beams 121 enter birefringent wedge crystal 2, strictly rotated with the angle of the plane of polarization of light beam 100
90 ° of light beam is propagated with the beam path of light beam 3 122, and is assembled via the collimation lens of optical fiber collimator 1 12 and entered monochromatic light
Fine head 11.And temperature and wavelength dependence energy due to Faraday rotator 3, it is inclined with the angle rotation of the plane of polarization of light beam 100
Light beam from 90 ° is propagated with the beam path of light beam 4 123, is α's from birefringent wedge crystal 2 and vertical axis angle
Light passing plane 21 is emitted, and cannot be coupled in optical fiber head 11 by the collimation lens 12 of optical fiber collimator 1.
It is achieved in outgoing beam 100, through birefringent wedge crystal 2, Faraday rotator 3, after reflecting mirror 4 reflects,
Polarization state is not influenced by temperature and wavelength, is strictly rotated by 90 °, and is coupled into optical fiber collimator 1 again.
The utility model is inserted into birefringent wedge crystal 2 between optical fiber collimator 1 and Faraday rotator 3, eliminates
Faraday rotation angle is influenced by wavelength and temperature, and realizes product with compact structure, and technique is simple, low in cost.
The Birefringent crystal prism that the patent CN104635347A that compares simultaneously is used, the cost of the utility model are lower
It is honest and clean, more compact structure.
Patent CN102906629A, CN204241726U that compares use be inserted between this in double optical fiber head and collimation lens it is double
Refracting crystal shifter, without being inserted into birefringece crystal displacement between the single fiber head 11 and collimation lens 12 of the utility model
Device, manufacturing process is simpler, and more compact structure.
Although those familiar with the art answers the foregoing describe specific embodiment of the present utility model
Working as understanding, we are merely exemplary described specific embodiment, rather than for the limit to the scope of the utility model
Fixed, those skilled in the art modification and variation equivalent made by the spirit according to the utility model all should
Cover in the scope of the claimed protection of the utility model.
Claims (10)
1. a kind of faraday rotation mirror unrelated with wavelength and temperature, it is characterised in that: including the optical fiber being sequentially arranged along optical path
Collimator, birefringent wedge crystal, Faraday rotator and reflecting mirror；The light passing table of the reflecting mirror and Faraday rotator
Face is parallel with birefringent wedge crystal right-angle plane；The birefringent wedge crystal include one and the angle of vertical axis be α's
Light passing plane and a right angle light passing plane, and its optical axis is located at the incident ray of birefringent wedge crystal and putting down for normal composition
In face, while the angle of optical axis and horizontal axis is θ；The incident ray of birefringent wedge crystal and the angle of horizontal axis are β.
2. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: the farad
Rotator is Faraday rotation piece.
3. a kind of faraday rotation mirror unrelated with wavelength and temperature as claimed in claim 2, it is characterised in that: the wedge shape
Birefringece crystal, Faraday rotation piece, reflecting mirror are split type.
4. a kind of faraday rotation mirror unrelated with wavelength and temperature as claimed in claim 2, it is characterised in that: the wedge shape
Birefringece crystal, Faraday rotation piece, reflecting mirror are monoblock type.
5. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: the optical fiber
Collimator includes single fiber head, collimation lens and glass bushing；The glass sock pipe sleeve is in the single fiber head and collimation lens
Outside, and the collimation lens be located at single fiber head injection light rear.
6. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: the farad
Rotator includes Faraday rotation crystal and externally-applied magnetic field mechanism, and the magnetic direction that the externally-applied magnetic field mechanism applies is parallel to
Optical direction.
7. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: the farad
Rotator is the Faraday rotation crystal of included magnetic, and included magnetic direction is parallel to optical direction.
8. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: the reflection
Mirror is to be coated with reflective coating and the mirror surface that is formed in the rear end face of the Faraday rotation crystal.
9. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: the reflection
Mirror is split type reflecting optics.
10. a kind of faraday rotation mirror unrelated with wavelength and temperature as described in claim 1, it is characterised in that: α, β and θ
Relationship, following equation need to be met:
Wherein, noFor birefringece crystal O optical index, neFor birefringece crystal E optical index, n (θ e) is E light in birefringent crystalline substance
Refractive index when body is propagated along wave normal direction, θ e are the angle of E wave normal and horizontal axis, and n (θ e) and θ e are by following two
Equation solves:
Sin (alpha+beta)=n (θ e) sin (α-(θ-θ e)) --- --- --- (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920161275.1U CN209343053U (en) | 2019-01-30 | 2019-01-30 | A kind of faraday rotation mirror unrelated with wavelength and temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920161275.1U CN209343053U (en) | 2019-01-30 | 2019-01-30 | A kind of faraday rotation mirror unrelated with wavelength and temperature |
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| CN209343053U true CN209343053U (en) | 2019-09-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581681A (en) * | 2019-01-30 | 2019-04-05 | 福建华科光电有限公司 | A kind of faraday rotation mirror unrelated with wavelength and temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581681A (en) * | 2019-01-30 | 2019-04-05 | 福建华科光电有限公司 | A kind of faraday rotation mirror unrelated with wavelength and temperature |
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