CN109613724A - A kind of magneto-optic adjustable optical attenuator - Google Patents
A kind of magneto-optic adjustable optical attenuator Download PDFInfo
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- CN109613724A CN109613724A CN201910089184.6A CN201910089184A CN109613724A CN 109613724 A CN109613724 A CN 109613724A CN 201910089184 A CN201910089184 A CN 201910089184A CN 109613724 A CN109613724 A CN 109613724A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/48—Variable attenuator
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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention provides a kind of magneto-optic adjustable optical attenuator, using the sub-assembly of the first wedge-shaped birefringece crystal, the second birefringent wedge crystal and a Faraday rotation crystal, magneto-optic adjustable optical attenuator of the present invention is further minimized, and debugging assembly is simpler, improves working efficiency.The permanent-magnetic field perpendicular to optical path of a saturation is applied in side using saturation magnetic field applying mechanism simultaneously, and the variable magnetic field applying mechanism of upper variable magnetic field is covered in the first wedge-shaped birefringece crystal, the second birefringent wedge crystal and Faraday rotation crystal periphery, both the purpose for having realized miniaturization also overcomes the defect of the unstable brought poor repeatability in magnetic domain boundary in the prior art.The difficulty in process that birefringent crystal beam shifter is placed in institute's band between double optical fiber head and collimation lens in the prior art is also overcomed, so that present invention manufacture is more simple and convenient, substantially reduces manufacturing cost.
Description
Technical field
The present invention relates to variable optical attenuator field, especially a kind of magneto-optic adjustable optical attenuator.
Background technique
Conventional magneto-optic attenuator, by double optical fiber head, collimation lens, birefringent wedge crystal, Faraday rotator, reflection
Microscope group at.Wherein Faraday rotator has the fixed magnet of a variable magnetic field by Faraday rotation crystal, and in its side, applies
Add the variable magnetic field perpendicular to optical direction, and have the magnet of a fixed magnetic field after reflecting mirror, magnetic direction is parallel to light passing
Direction composition.Conventional magneto-optic attenuator, due to using birefringent wedge crystal in optical path, it is required that collimator is two-fold with wedge shape
Crystal to be penetrated to have a certain degree, i.e., collimator will be in tilted layout, cannot be horizontally disposed, it is unfavorable for assembling in this way, is also unfavorable for small
Type.In addition, applying the fixation magnetic of a parallel light path after reflecting mirror due to applying the variable magnetic field perpendicular to optical path in side
, this structure, volume is larger, is unfavorable for the miniaturization of product.
Application No. is 03127861.2, Authorization Notice No. CN100334484C, authorized announcement date is the hair of 2007.8.29
Bright patent specifically discloses a kind of magneto-optic optical parts, by double optical fiber head, collimation lens, birefringent wedge crystal, faraday
Rotator, reflecting mirror composition.Wherein Faraday rotator has a fixed magnet by Faraday rotation crystal, and in its side,
Apply the saturation magnetic field for being parallel to optical direction, and have the magnet of a variable magnetic field after reflecting mirror, magnetic direction is parallel to
Optical direction.In optical path as conventional magneto-optical attenuator, using birefringent wedge crystal, it is unfavorable for minimizing.In addition, side
One fixed magnetic field for being parallel to optical path is set, applies a variable magnetic field again in optical path direction, by changing in the full of light passing region
Faraday's rotation angle is controlled with magnetic domain area, its shortcoming is that the unstability on magnetic domain boundary, so that product repeatability is not
It is good.
United States Patent (USP) US7379226B2 discloses a variable light attenuator, by double optical fiber head, birefringece crystal displacement
Device, collimation lens, Faraday rotator, reflecting mirror composition.Wherein Faraday rotator is by Faraday rotation crystal, and at it
There is the magnet of variable magnetic field in side, applies the variable magnetic field perpendicular to optical direction, and have a fixed magnetic field after reflecting mirror
Magnet, magnetic direction are parallel to optical direction.Birefringent crystal beam shifter is used in optical path, is placed in double optical fiber head and standard
Between straight lens, although overcoming collimator required by the birefringent cumeat used by routine techniques and birefringent wedge
The defect of the intrinsic flat angle of crystal.But because birefringent crystal beam shifter be placed on double optical fiber head and collimation lens it
Between, so that actual product assembly technology is complicated, it is with high costs.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of magneto-optic adjustable optical attenuator, two-fold using two wedge shapes
Crystal and faraday's crystal combinations part are penetrated, most of single birefringent wedges used in conventional and other patents are overcome
Collimator brought by crystal forms an angle with birefringent wedge crystal, is unfavorable for the shortcomings that minimizing and debugging assembly.
The present invention is implemented as follows: a kind of magneto-optic adjustable optical attenuator, including the first wedge-shaped birefringece crystal, the second wedge
Shape birefringece crystal, Faraday rotation crystal, the saturation magnetic field for applying saturation magnetic field to the Faraday rotation crystal are applied
Add mechanism, the variable magnetic field applying mechanism for applying variable magnetic field, for emitting optical signal and receiving double optical fiber of optical signal
Collimator；
Described first wedge-shaped birefringece crystal includes first wedge edged surface and the second angle of wedge face；Second birefringent wedge is brilliant
Body includes third angle of wedge face and the 4th angle of wedge face, and third angle of wedge face is parallel to second angle of wedge face；
The double-fiber collimator includes the second optical fiber, the Yi Jizhun of the first optical fiber of optical signal input, optical signal output
Straight lens；The standard is arranged again behind the outgoing end face of first optical fiber and the second optical fiber parallel arrangement, the first optical fiber and the second optical fiber
Straight lens, the first wedge-shaped birefringece crystal, the second birefringent wedge crystal, Faraday rotation crystal be successively close to arrange,
And second angle of wedge face and third angle of wedge face are close to, the optical axis of the described first wedge-shaped birefringece crystal is in horizontal axis and normal
In the plane at place, the Axis Azimuth angle of the first wedge-shaped birefringece crystal and horizontal axis are into θ angle, second birefringent wedge
The optical axis of crystal is perpendicular to the plane where horizontal axis and normal；
The saturation magnetic field applying mechanism is arranged in the side of the Faraday rotation crystal, and the saturation magnetic field applied
Direction is perpendicular to horizontal axis；The variable magnetic field applying mechanism is set in the described first wedge-shaped birefringece crystal, the second wedge shape
The outside of birefringece crystal, Faraday rotation crystal, saturation magnetic field applying mechanism, and variable magnetic field applying mechanism application
The direction of variable magnetic field is to be parallel to horizontal axis.
Further, the described first wedge-shaped birefringece crystal, the second birefringent wedge crystal, the connection of Faraday rotation crystal
At an entirety.
Further, the incidence angle for injecting the incident light of the described first wedge-shaped birefringece crystal is β, the first wedge edged surface
Inclination angle be α 1；The inclination angle in second angle of wedge face and third angle of wedge face is all α 2；The inclination angle in the 4th angle of wedge face is α 3；α
1, α 2, α 3, θ and β, meet following relational expression:
Wherein, the sign convention of angle of wedge face inclination angle is that inclination is negative clockwise, and inclination is positive counterclockwise；noFor birefringece crystal
O optical index, neFor birefringece crystal E optical index, θ e is the angle of E wave normal and horizontal axis, and n (θ e) is that E light exists
Refractive index when birefringece crystal wave normal direction is propagated, n (θ e) and θ e are obtained by following two equation:
sin(α1- β)=n (θ e) sin (α 1- (θ-θ e)) (2).
Further, the saturation magnetic field applying mechanism is two permanent magnets, and the two permanent magnet one-to-one correspondence are arranged in
The two sides up and down of the Faraday rotation crystal.
Further, the variable magnetic field applying mechanism is induction coil.
Further, the Faraday rotation crystal is the Faraday rotation piece in not included magnetic field, and in the farad
Revolving fragment rear end face is provided with reflective coating as mirror surface.
The present invention has the advantage that the present invention is due to brilliant using the first wedge-shaped birefringece crystal, the second birefringent wedge
The sub-assembly of body and a Faraday rotation crystal allows magneto-optic adjustable optical attenuator of the present invention further small
Type, and debug and assemble simpler, raising working efficiency.A saturation is applied in side using saturation magnetic field applying mechanism simultaneously
Perpendicular to the permanent-magnetic field of optical path, and in the first wedge-shaped birefringece crystal, the second birefringent wedge crystal and Faraday rotation
Crystal periphery puts on the variable magnetic field applying mechanism of variable magnetic field, had both realized the purpose of miniaturization, and had also overcomed the prior art
The defect of poor repeatability brought by middle magnetic domain boundary is unstable.It also overcomes and is in the prior art displaced birefringent crystal beam
Device is placed in the difficulty in process of institute's band between double optical fiber head and collimation lens, so that present invention manufacture is more simple and convenient, drops significantly
Low manufacturing cost.
Detailed description of the invention
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
In the description of the present invention, it should be noted that such as occur term " center ", "upper", "lower", "left", "right",
"vertical", "horizontal", "inner", "outside" etc., the orientation or positional relationship of instruction are that orientation based on the figure or position are closed
System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, such as there is art
Language " first ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Fig. 1 is the structure and light path schematic diagram of magneto-optic attenuator conventional in background technique.
Fig. 2 is the structure and light path schematic diagram of magneto-optic adjustable optical attenuator of the invention.
Fig. 3 is the side view of magneto-optic adjustable optical attenuator of the invention.
Fig. 4 is the top view of magneto-optic adjustable optical attenuator of the invention.
In figure: 1, double optical fiber head, 2, collimation lens, 3, birefringent wedge crystal, 4, Faraday rotator, 5, reflecting mirror,
6, permanent magnet；
100, the light that the first optical fiber projects, the 110, first light beam, the 111, first the reflected beams, 112, light beam one,
113, light beam three, the 120, second light beam, the 121, second the reflected beams, 122, light beam two, 123, light beam four；
200, double-fiber collimator, the 201, first wedge-shaped birefringece crystal, 2011, first wedge edged surface, 2012, second angle of wedge
Face, the 202, second birefringent wedge crystal, 2021, third angle of wedge face, the 2022, the 4th angle of wedge face, 203, Faraday rotation crystal,
2031, reflective coating, 204, saturation magnetic field applying mechanism, 205, variable magnetic field applying mechanism, the 206, first optical fiber, 207, second
Optical fiber, 208, collimation lens, the optical axis of the 209, first wedge-shaped birefringece crystal, 210, the light of the second birefringent wedge crystal
Axis, 211, capillary glass tube；The direction in the magnetic field that B1, saturation magnetic field applying mechanism apply, B2, variable magnetic field applying mechanism apply
Magnetic field direction.
Specific embodiment
It please refers to shown in Fig. 2 to 4, the present invention provides a kind of magneto-optic adjustable optical attenuator, including the first birefringent wedge crystalline substance
Body 201, Faraday rotation crystal 203, is used to apply second birefringent wedge crystal 202 to the Faraday rotation crystal 203
The saturation magnetic field applying mechanism 204 of saturation magnetic field, the variable magnetic field applying mechanism 205 for applying variable magnetic field, for emitting
First optical fiber 206 of optical signal and the second optical fiber 207 for receiving optical signal；
Described first wedge-shaped birefringece crystal 201 includes first wedge edged surface 2011 and the second angle of wedge face 2012；Described second
Birefringent wedge crystal 202 includes third angle of wedge face 2021 and the 4th angle of wedge face 2022, and third angle of wedge face 2021 is parallel to
Second angle of wedge face 2012；
The double-fiber collimator 200 includes the second optical fiber of the first optical fiber 206 of optical signal input, optical signal output
207 and collimation lens 208；First optical fiber 206 and the second optical fiber 207 parallel arrangement, the first optical fiber 206 and the second optical fiber 207
Outgoing end face after arrange the collimation lens 208 again；Described first wedge-shaped birefringece crystal 201, the second birefringent wedge are brilliant
Body 202, Faraday rotation crystal 203 are successively close to arrangement, and second angle of wedge face 2012 and third angle of wedge face 2021 are close to,
The optical axis 209 of described first wedge-shaped birefringece crystal 201 is in the plane where horizontal axis and normal, the first birefringent wedge
209 azimuth of optical axis of crystal 201 and horizontal axis are into θ angle, and the optical axis 210 of the second birefringent wedge crystal 202 is vertical
Plane where horizontal axis and normal.In a specific embodiment, the first optical fiber 206 and the second optical fiber 207 are placed in parallel
In capillary glass tube 211, collimation lens 208 is mounted on going out for capillary glass tube 211, the first optical fiber 206 and the second optical fiber 207
After penetrating end face, to connect into an entirety as double-fiber collimator 200, collimation lens 208 is for will be from the first optical fiber
The diverging light collimation of 206 outgoing, and will reflect back into the collimated light come and converge on the second optical fiber 207.
The wedge-shaped birefringece crystal 201 of described first, the second birefringent wedge crystal 202, Faraday rotation crystal 203 connect
It is connected into an entirety, in specific implementation, for example, they are whole at one by the technique bonding of glued, bonding or optical contact
Body.
The side of the Faraday rotation crystal 203 is arranged in the saturation magnetic field applying mechanism 204, be in Fig. 2 on
Lower two sides, and the direction B1 of the saturation magnetic field applied is perpendicular to horizontal axis；The variable magnetic field applying mechanism 205 is set in institute
The first wedge-shaped birefringece crystal 201, the second birefringent wedge crystal 202, Faraday rotation crystal 203, saturation magnetic field is stated to apply
The outside of mechanism 204, and the direction B2 of the variable magnetic field of the variable magnetic field applying mechanism 205 application is to be parallel to trunnion axis
Line.
The incidence angle for injecting the incident light of the described first wedge-shaped birefringece crystal 201 is the β (light that as the first optical fiber projects
The angle of line 100 and horizontal axis), the inclination angle of the first wedge edged surface 2011 is α 1；Second angle of wedge face 2012 and third
The inclination angle in angle of wedge face 2021 is all α 2；The inclination angle in the 4th angle of wedge face 2022 is α 3；α 1, α 2, α 3, θ and β meet such as ShiShimonoseki
It is formula:
Wherein, the sign convention of angle of wedge face inclination angle is that inclination is negative clockwise, and inclination is positive counterclockwise；noFor birefringece crystal
O optical index, neFor birefringece crystal E optical index, θ e is the angle of E wave normal and horizontal axis, and n (θ e) is that E light exists
Refractive index when birefringece crystal is propagated along wave normal direction, n (θ e) and θ e are obtained by following two equation:
sin(α1- β)=n (θ e) sin (α 1- (θ-θ e)) (2).
Wherein, α 1, α 2, α 3, θ and β use unified angular unit, for example, unit all degree of being.
The saturation magnetic field applying mechanism 204 is two permanent magnets 204, and two one-to-one correspondence of permanent magnet 204 are arranged in
The two sides up and down of the Faraday rotation crystal 203, so that the Faraday rotation crystal 203 is in saturation magnetic field always
It is interior, when overcoming that Faraday rotation crystal is in variable magnetic field in the prior art, the unstability on magnetic domain boundary, so that product weight
The bad problem of renaturation, so that repeatability of the present invention greatly improves.
The variable magnetic field applying mechanism 205 is induction coil 205.
The Faraday rotation crystal 203 is the Faraday rotation piece 203 in not included magnetic field, and is revolved in the faraday
203 rear end face of rotor is provided with reflective coating 2031 as mirror surface, has the function of reflecting mirror, such as be embodied
In, the high reflection film layer in operating wavelength range is directly coated with as mirror surface in 203 rear end face of Faraday rotation piece.
Working principle: the light 100 projected from the output optical fibre 206 of double-fiber collimator 200, along rectangular coordinate system Z axis
It propagates, is injected into the first wedge-shaped birefringece crystal 201, be divided into orthogonal first light beam 110 in polarization direction and the
Two light beams 120.Using the second birefringent wedge crystal 202, make the first light beam 110 and the second light beam 120
On the reflecting surface for assembling Faraday rotation crystal 203.
As shown in Figures 3 and 4, make the saturation magnetic field B1 of its variable magnetic field B2 and two permanent magnets 204 when induction coil 205 is powered
When the saturation magnetic field that the magnetic-field component on optical direction is more than or equal to Faraday rotation crystal requires, light beam is revolved by faraday
Turn device to reflect, the plane of polarization of the first the reflected beams 111 and the second the reflected beams 121 is total to be rotated by 90 °.Wherein, the first reflected light
When beam 111 enters the first wedge-shaped birefringece crystal 201, propagated with the beam path of light beam 1, via 208 meeting of collimation lens
It is received after poly- by the second optical fiber 207.When second the reflected beams 121 enter the first wedge-shaped birefringece crystal 201, with light beam two
122 beam path is propagated, and is received after assembling via collimation lens 208 by the second optical fiber 207.It is thus achieved that polarization nothing
Loss-free optical transport of the optical signal of pass in entry port to exit ports.
As shown in Figures 3 and 4, as the energization of induction coil 205, the saturation magnetic field B1 of variable magnetic field B2 and two permanent magnetics 204
When the saturation magnetic field that magnetic-field component on optical direction is less than Faraday rotation crystal requires, light beam passes through Faraday rotator
The plane of polarization of 203 reflections, the first the reflected beams 111 and the second the reflected beams 121 is total to rotate less than 90 °.First the reflected beams
When 111 the first wedge-shaped birefringece crystal 201 of entrance, in addition to some is propagated with the beam path of light beam 1, and it is collimated
Mirror 208 is received outer by the second optical fiber 207 after assembling, also some, can not coupling with the beam path propagation of light beam 3 113
It closes into the second optical fiber 207.Similarly, when the second the reflected beams 121 enter the first wedge-shaped birefringece crystal 201, in addition to some
It is propagated with the beam path of light beam 2 122, and outside being received by the second optical fiber 207 after being assembled via collimation lens 208, also
Some is propagated with the beam path of light beam 4 123, can not be coupled in the second optical fiber collimator 207.It is thus achieved that polarization
Transmission of the unrelated optical signal in the magnetic control light decrement of entry port to exit ports.
The present invention adjusts the size of variable magnetic field by adjusting the size of the electric current of induction coil, thus realization pair
The adjusting of attenuated optical signal.
The present invention is due to using the first wedge-shaped birefringece crystal 201, the second birefringent wedge crystal 202 and a faraday
The sub-assembly of rotating crystal 203 overcomes most of single birefringent wedge crystal institute bands used in conventional and other patents
The collimator come forms an angle with birefringent wedge crystal, inclination arrangement that collimator needs and horizontal axis has angle, no
The shortcomings that conducive to minimizing and debugging assembly.So that the first optical fiber collimator 201 of the invention, the second optical fiber collimator
202 or the double-fiber collimator 200 of monoblock type can be arranged by the way of being parallel to horizontal axis so that of the present invention
Magneto-optic adjustable optical attenuator can further minimize, and debug assembly it is simpler, improve working efficiency.
Compare patent CN100334484C simultaneously, and the present invention is due to using in one saturation of side application perpendicular to optical path
Permanent-magnetic field, that is, saturation magnetic field B1, and in the first wedge-shaped birefringece crystal 201, the second birefringent wedge crystal 202 and method
It draws 203 periphery of rotating crystal to put on the induction coil 205 of variable magnetic field, has both realized the purpose of miniaturization, also overcomed
The defect of poor repeatability brought by CN100334484C patented technology magnetic domain boundary is unstable.
The United States Patent (USP) that compares US7379226B2 uses two birefringent wedge crystal and a faraday due to the present invention
Crystal combinations part overcomes United States Patent (USP) US7379226B2 for birefringent crystal beam shifter and is placed in double optical fiber head and standard
The difficulty in process of institute's band between straight lens.So that present invention manufacture is more simple and convenient, manufacturing cost is substantially reduced.
Although specific embodiments of the present invention have been described above, those familiar with the art should be managed
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field should be covered of the invention according to modification and variation equivalent made by spirit of the invention
In scope of the claimed protection.
Claims (6)
1. a kind of magneto-optic adjustable optical attenuator, it is characterised in that: brilliant including the first wedge-shaped birefringece crystal, the second birefringent wedge
Body, the saturation magnetic field applying mechanism for applying saturation magnetic field to the Faraday rotation crystal, is used for Faraday rotation crystal
Apply the variable magnetic field applying mechanism of variable magnetic field, for emitting optical signal and receiving the double-fiber collimator of optical signal；
Described first wedge-shaped birefringece crystal includes first wedge edged surface and the second angle of wedge face；The second birefringent wedge crystal packet
Third angle of wedge face and the 4th angle of wedge face are included, third angle of wedge face is parallel to second angle of wedge face；
The double-fiber collimator includes that the first optical fiber of optical signal input, the second optical fiber of optical signal output and collimation are saturating
Mirror；Arrange that the collimation is saturating again behind the outgoing end face of first optical fiber and the second optical fiber parallel arrangement, the first optical fiber and the second optical fiber
Mirror, the described first wedge-shaped birefringece crystal, the second birefringent wedge crystal, Faraday rotation crystal are successively close to arrange, and institute
It states the second angle of wedge face and third angle of wedge face to be close to, the optical axis of the described first wedge-shaped birefringece crystal is where horizontal axis and normal
Plane in, the Axis Azimuth angle of the first wedge-shaped birefringece crystal and horizontal axis are into θ angle, the second birefringent wedge crystal
Plane of the optical axis perpendicular to horizontal axis and where normal；
The side of the Faraday rotation crystal, and the direction of the saturation magnetic field applied is arranged in the saturation magnetic field applying mechanism
Perpendicular to horizontal axis；It is two-fold that the variable magnetic field applying mechanism is set in the described first wedge-shaped birefringece crystal, the second wedge shape
The outside of crystal, Faraday rotation crystal, saturation magnetic field applying mechanism is penetrated, and variable magnetic field applying mechanism application is variable
The direction in magnetic field is to be parallel to horizontal axis.
2. a kind of magneto-optic adjustable optical attenuator according to claim 1, it is characterised in that: first birefringent wedge is brilliant
Body, the second birefringent wedge crystal, Faraday rotation crystal connect into an entirety.
3. a kind of magneto-optic adjustable optical attenuator according to claim 1, it is characterised in that: it is two-fold to inject first wedge shape
The incidence angle for penetrating the incident light of crystal is β, and the inclination angle of the first wedge edged surface is α 1；Second angle of wedge face and third angle of wedge face
Inclination angle be all α 2；The inclination angle in the 4th angle of wedge face is α 3；α 1, α 2, α 3, θ and β, meet following relational expression:
Wherein, the sign convention of angle of wedge face inclination angle is that inclination is negative clockwise, and inclination is positive counterclockwise；noFor birefringece crystal O light folding
Penetrate rate, neFor birefringece crystal E optical index, θ e is the angle of E wave normal and horizontal axis, and n (θ e) is E light birefringent
Refractive index when crystal wave normal direction is propagated, n (θ e) and θ e are obtained by following two equation:
Sin (α 1- β)=n (θ e) sin (α 1- (θ-θ e)) (2).
4. a kind of magneto-optic adjustable optical attenuator according to claim 1, it is characterised in that: the saturation magnetic field applying mechanism
For two permanent magnets, two permanent magnets correspond the two sides up and down for being arranged in the Faraday rotation crystal.
5. a kind of magneto-optic adjustable optical attenuator according to claim 1, it is characterised in that: the variable magnetic field applying mechanism
For induction coil.
6. a kind of magneto-optic adjustable optical attenuator according to claim 1, it is characterised in that: the Faraday rotation crystal is
The Faraday rotation piece in not included magnetic field, and reflective coating is provided with as reflecting mirror in the Faraday rotation piece rear end face
Face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910089184.6A CN109613724B (en) | 2019-01-30 | 2019-01-30 | Magneto-optical adjustable optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910089184.6A CN109613724B (en) | 2019-01-30 | 2019-01-30 | Magneto-optical adjustable optical attenuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109613724A true CN109613724A (en) | 2019-04-12 |
| CN109613724B CN109613724B (en) | 2024-02-13 |
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| CN201910089184.6A Active CN109613724B (en) | 2019-01-30 | 2019-01-30 | Magneto-optical adjustable optical attenuator |
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| CN209343071U (en) * | 2019-01-30 | 2019-09-03 | 福建华科光电有限公司 | A kind of magneto-optic adjustable optical attenuator |
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| CN1160212A (en) * | 1996-03-01 | 1997-09-24 | 富士通株式会社 | Variable optical attenuator which applies magnetic field to faraday element to rotate polarization of light signal |
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| CN209343071U (en) * | 2019-01-30 | 2019-09-03 | 福建华科光电有限公司 | A kind of magneto-optic adjustable optical attenuator |
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| CN109613724B (en) | 2024-02-13 |
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