CN102798989B - The light partition method of Faraday method and device and this device of use and device - Google Patents
The light partition method of Faraday method and device and this device of use and device Download PDFInfo
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Abstract
The light partition method of a kind of Faraday method and device and this device of use and device; Described method is, makes half slide of backlight between optically-active element, and the polarization state of polarized light is just in time parallel with the optical axis of half slide or become 90 degree.Described device comprises faraday components, magnet ring and half-wave plate; Faraday components is located in magnet ring, and the axle center of faraday components and magnet ring axle center on the same axis, form an optically-active element; Two or more optically-active element magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
Description
Technical field
The present invention relates to the magnetic-optic devices technology in the system such as laser instrument or optical communication, the Faraday device correlation technique particularly in optoisolator.
Background technology
Faraday device is the core devices of current optoisolator application.But, Faraday rotatory material known is at present all very little to the Verdet constant (VerdetConstant) within the scope of 1 mum wavelength at visible ray 400nm, and this just makes magnetic field intensity that the optoisolator product needed in this wavelength coverage is very high and a large amount of faraday's crystal.Thus the optoisolator cost of products that result also in this wavelength coverage is high and not easily produce.As the topmost application-fiber laser technology of this wave band, becoming the mainstream technology of industrial laser.It is up to standard at materials processing, laser, application in laser weapon etc. is just in develop rapidly.In this year, country also increases input to fiber laser technology and support.And isolator has become one of bottleneck limiting its fast development.
The research of related fields is:
" electronic technology ", 2009 (02): 31-32. these papers introduce the method for designing of miniature broadband optoisolator.Optoisolator comprises the online optoisolator of polarization independent type miniaturization optoisolator relevant with polarization.Common polarization independent optical isolator generally all needs light to be splitted into o light and e light two parts, and this just must must use polarizing beam splitter.Conventional polarizing beam splitter has two kinds: 1. birefringence cumeat; 2. the birefringence one type crystal of parallel beam splitter.They have obvious shortcoming: the former can make o light and the light path of e light in crystal different, produce the dispersion of nature polarizing coating, additional polarizing coating dispersion compensation sheet must be obtained, so both added the volume that cost in turn increases isolator.Although the latter can make o, e light light path identical, the volume of crystal own is excessive, is difficult to satisfied optical communication system now to the requirement of device miniaturization.For this reason, devise a kind of without the need to polarizing coating dispersion compensation sheet, and after faraday rotator, add quarter wave plate or full-wave plate to reach the miniature bandwidth optoisolator of spread bandwidth object, overcome both shortcoming above, not only reduce reverse isolation degree, and the isolation scope of 50dB optoisolator can be made to become about more than 80dB, therefore be called miniature broadband optoisolator.
And for example:
" laser and infrared ", 2006 (02): 125-127. this articles propose a kind of design proposal of miniaturization optoisolator, and by theoretical analysis, it realizes principle and each optical parametric, and confirm the validity of the program by experiment.Design result shows, under guarantee obtains excellent parameter situation, adopts the program that optical isolator structure can be made compacter, and effectively reduces its cost and assembly difficulty.After the Optical rotatory dispersion of faraday rotator being compensated by quarter wave plate and full-wave plate, the isolation parameter of this device can be made insensitive with wavelength variations, in addition, owing to adopting symmetrical light path design, the polarization mode dispersion theoretical value of the program is 0, without the need to additional compensation.
For another example:
Publication number is in CN1389991 [P] patent of invention, provide a kind of method and the broadband light isolator thereof that increase isolator isolation bandwidth, the angular dispersion of Farady rotator is converted into the phase place change of polarized light, then phase place change is reduced with full-wave plate, thus eliminate the change of the device isolation degree caused by the angular dispersion of Farady rotator, the bandwidth of isolator is increased, and isolation increases.Its broadband light isolator is by polarizing beam splitter, Farady rotator, polarization splicer and divide at polarization, full-wave plate between splicer and λ/4 wave plate form.
For another example:
Publication number is in the utility model patent of CN201859277U [P], for an optoisolator for optical fiber communication, it is characterized in that successively along optical direction be parallel to each other place forward polarization state Control Component, barrier assembly and negative polarization state Control Component; Forward polarization state Control Component be successively along optical direction be parallel to each other place First Line polarizer and the first quarter-wave plate; Barrier assembly be successively along optical direction be parallel to each other place the first high reflectance reflecting body, Faraday device and the second high reflectance reflecting body and permanent magnet; Negative polarization state Control Component be successively along optical direction be parallel to each other place the second quarter-wave plate and the second linear polarizer.Beneficial effect: the small size change at Faraday rotation angle can not the performance of serious deterioration optoisolator, reduces the requirement to Faraday magnetic optic materials temperature stability; Single-stage isolated is only utilized just to realize the requirement of more than 40-65dB isolation; Light does not produce transversal displacement, and light path is short, can realize the miniaturization of device.
Technology contents
The present invention seeks to for above the deficiencies in the prior art, a kind of the polarization state light allowing linearly polarized light to be parallel to main shaft is provided to pass through, to get rid of the extinction ratio deterioration caused by half-wave plate machining precision, to provide the extinction ratio of maximum possible, and also can realize the isolation of maximum possible based on the isolator of this kind of Faraday device, the Faraday apparatus structure of working stability.
Object of the present invention can be achieved through the following technical solutions: a kind of implementation method of Faraday, for realizing most High Extinction Ratio, described method is, makes the half-wave plate of backlight between optically-active element, and the polarization state of polarized light is just in time parallel with the optical axis of half-wave plate or become 90 degree.
The implementation method of described Faraday, its optically-active element comprises faraday components and magnet ring, and faraday components is located in magnet ring, and the axle center of faraday components and magnet ring axle center are at same axis.
A kind of Faraday device, its Faraday device comprises faraday components, magnet ring and half-wave plate; Faraday components is located in magnet ring, and the axle center of faraday components and magnet ring axle center on the same axis, form an optically-active element; Two or more optically-active element magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
Described Faraday device, its optically-active element is two, and optically-active element magnetic pole reversed arrangement each other vertically, on the axis between two optically-active elements, is provided with half-wave plate.
Described Faraday device, its optically-active element is three, and optically-active element magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
The invention has the advantages that, provide a kind of the polarization state light allowing linearly polarized light to be parallel to main shaft to pass through, to get rid of the extinction ratio deterioration caused by half-wave plate machining precision, to provide the extinction ratio of maximum possible, and the isolation of maximum possible also can be realized based on the isolator of this kind of Faraday device, namely the Faraday apparatus structure of working stability applies this polarization apparatus optoisolator.
Accompanying drawing explanation
Fig. 1 is the sectional drawing schematic diagram of the Faraday device that the present invention is made up of two opposite magnetic magnet rings;
Fig. 2 is the sectional drawing schematic diagram of the Faraday device that the present invention is made up of three opposite magnetic magnet rings;
Fig. 3 A be line polarization light of the present invention by desirable, become the schematic diagram of the half-wave plate of miter angle with wave plate main shaft;
Fig. 3 B be line polarization light of the present invention by incomplete, become the schematic diagram of the half-wave plate of miter angle with wave plate main shaft;
Fig. 4 A is the schematic diagram of linearly polarized light by half-wave plate that polarization state of the present invention is parallel to the fast axle of half-wave plate;
Fig. 4 B is the schematic diagram of linearly polarized light by half-wave plate that polarization state of the present invention is parallel to half-wave plate slow axis;
Fig. 5 A is the sectional drawing schematic diagram of polarized light forward by this optically-active device of the Faraday device that is made up of two faraday components of the present invention and single polarization state;
Fig. 5 B be the Faraday device that is made up of two faraday components of the present invention and single polarization state polarized light back through the sectional drawing schematic diagram of this optical rotation plate;
Fig. 6 A is the sectional drawing schematic diagram of this optically-active device that the polarized light forward of the Faraday device that is made up of three faraday components of the present invention and single polarization state passes through;
Fig. 6 B be the Faraday device that is made up of three faraday components of the present invention and single polarization state polarized light back through the sectional drawing schematic diagram of this optically-active device;
Fig. 7 A is optoisolator of the present invention, and light beam forward is by the cutaway side view schematic diagram of this isolator;
Fig. 7 B is optoisolator of the present invention, and light beam is back through the cutaway side view schematic diagram of this isolator.
Embodiment
Faraday device is a kind of magnetic-optic devices, is made up of faraday components and magnet ring.Magnet ring is the magnetic field that faraday components provides for generation of Faraday effect.By this Faraday effect, can make to produce deflection by the different polarization states of the light of Faraday device.Due to the one-way of this deflection, Faraday device can be applied in optoisolator.This optoisolator can only allow forward light to pass through, and stops retrodirected ray to pass through, to ensure the stability of whole laser system.When Faraday device is used to optoisolator, the angle of forward and reverse rotation and be necessary for 90 degree, to ensure that backlight is isolated; The computing formula of faraday's deflection angle below:
Wherein, L represents the length of faraday components, and V represents the Verdet constant of faraday components, and H represents the magnetic field in optical transmission direction.At visible ray in 1um wavelength coverage, the Verdet constant that can be used as the Transparent paramagnetic material of faraday components is all very little.Therefore, in this section of wavelength coverage, need very strong magnetic field could realize required for Faraday rotation angle.
For obtaining the high-intensity magnetic field for generation of Faraday effect, its method obtaining high-intensity magnetic field is at the multiple magnet ring being magnetized to opposite magnetic pole of axial array, the magnetic field produced due to the magnet ring of this compound is formed by each independent magnetic field overlap, therefore can produce the magnetic field more much better than than single magnet ring.Also therefore, the size of this magnet ring array, more much smaller than the independent magnet ring producing same intensity magnetic field.In this compound magnet ring, the direction of Faraday rotation by vertically each other the magnetic direction of reversed arrangement determine.Therefore, except magnet ring and faraday components, also need in the middle of adjacent two optically-active elements, put into faraday's yawing moment that half-wave plate could realize setting.Half-wave plate is a birefringece crystal having specific direction and thickness in essence.Its function is the equal of a speed reduction unit that can change the polarization state of the light wave by it.When half-wave plate exists deviation on thickness, it can change into linearly polarized light the elliptically polarized light of low extinction ratio, and then reduces the extinction ratio of Faraday device.Therefore, its extinction ratio can be limited to based on the isolation of the optoisolator of this kind of Faraday device.
In FIG, the first one-piece construction that numeral 100 is labeled as this Faraday device, wherein containing two coaxial magnet rings 101,102, is light passing hole in the middle of magnet ring; Be two faraday components be made up of paramagnetic material 103,104 in light passing hole, and be placed on the half-wave plate 105 between two optically-active elements.Can show that magnet ring 101 and 102 is placed as coaxial but magnetic pole is contrary by representing magnetic pole letter N and S in figure, therefore can obtain very strong magnetic field in through hole.
In fig. 2, the second one-piece construction that numeral 200 is labeled as this Faraday device, wherein containing three coaxial magnet rings 201,202 and 203, is light passing hole in the middle of magnet ring.Be three optically-active elements 204,205 and 206 be made up of paramagnetic material in through hole, and be placed on two half-wave plates 207 and 208 between optically-active element.Equally, in order to obtain the magnetic field of high strength in through hole, magnet ring 201,202 and 203 is placed as coaxial still contrary with magnetic pole between adjacent magnet ring.
As described earlier, half-wave plate is the core parts of the Faraday device that this improves.Half-wave plate is made up of birefringent crystal material, and according to its optical axis direction be parallel to surface structure cuts form.When ordinary refractive index is less than extraordinary refractive index, such as quartz, optical axis is called fast axle; And conversely, the direction of vertical surface plane is then called as slow axis.Fast axle and slow axis are all called as the main shaft of wave plate.The polarization state transmission speed being parallel to fast axle in light, faster than the polarization state perpendicular to fast axle, produces phase differential thus.For the slide of different-thickness, the emergent light of different polarization states can be produced by polarizer two axial light.
Half-wave plate can postpone a polarization state half-wavelength or 180 degree of phase differential, therefore can change the polarization direction of linearly polarized light.As shown in Figure 3A, for linearly polarized light is by the schematic diagram of desirable half-wave plate 301, just half-wavelength is postponed.The position that half-wave plate 301 is placed is that main shaft 302 is vertical with Z axis, all becomes miter angle with X, Y-axis simultaneously.As shown in 303, incident light is that transmission direction is parallel with Z axis, the linearly polarized light that polarization direction is parallel with Y-axis.As illustrated at 304, emergent light is still linearly polarized light, but polarization state has been turned to the other one side (polarization direction is parallel with X-axis) of main shaft.
In reality, due to the restriction of machining precision, always there is deviation in the thickness of half-wave plate.Consider this factor, Fig. 3 B be depicted as linearly polarized light in reality be there is the half-wave plate of deviation by thickness after upset result.Thickness there is the half-wave plate 305 of deviation and laying method before just the same, its main shaft 305 all becomes miter angle with X, Y-axis.The elliptically polarized light that it described before being changed into by identical incident light, the main optical axis of its elliptically polarized light is parallel to X-axis (along the upset of half-wave plate main shaft), and secondary optical axis is parallel with Y-axis simultaneously, as shown in plane 307.A branch of elliptically polarized light can be broken down into two bunch polarized lights, and its polarization state is present in the main of elliptically polarized light and secondary optical axis respectively.The ratio accounting for whole luminous power at secondary optical axis glazing power component is referred to as the extinction ratio of this elliptically polarized light.Such as, if the general power of elliptical light is 1000: 1 with the ratio of the luminous power of secondary optical axis, then the extinction ratio of this elliptically polarized light is 1000, or 30dB.Same, the extinction ratio of a branch of linearly polarized light is infinitely great.When the extinction axis of polaroid is parallel to the primary optical axis of polarized light, extinction ratio determines the degree of isolation of polarized light.Illustrating, is the elliptically polarized light of 30dB for a branch of extinction ratio, and after by desirable polaroid, it can be isolated into 0.01 of incident optical power, and a branch of desirable linearly polarized light then can be completely isolated.
And when the main axis parallel of the polarization state of incident light and half-wave plate (no matter fast axle or slow axis), emergent light is still linearly polarized light, and this is irrelevant with the thickness of half-wave plate.As shown in Figure 4 A, the half-wave plate that thickness exists deviation is placed as fast axle perpendicular to Z axis, and the used time is parallel to Y-axis.When the polarization state of the linearly polarized light of incidence is parallel to Y-axis (fast axle) equally, as shown in Fig. 4 A midplane 403, emergent light, as shown in plane 404, is still linearly polarized light, and its polarization state is parallel to Y-axis (not overturning).Equally, if the polarization state of incident light is along X-direction (slow axis), as Fig. 4 B midplane 405, emergent light, as shown in plane 406, is still linearly polarized light, and its polarization state is still parallel to X-axis (slow axis).
Principle of the present invention is exactly the half-wave plate main shaft in arrangement Faraday device, make when linearly polarized light back through invented draw optically-active device time, its polarization state is parallel to the main shaft of Faraday device inside half-wave plate.Like this, be still linearly polarized light from the light of this Faraday device outgoing, to reach the effect being polarized sheet isolation completely.The extinction ratio caused due to half-wave plate machining precision can be got rid of completely, draws the isolator based on the invention of optically-active device can realize the light isolation of maximum possible in this way.Meanwhile, the linearly polarized light that forward passes through then is changed into elliptically polarized light by this Faraday device.Therefore, when light beam is by this isolator, uploads defeated light vector at secondary optical axis and be coupled to after outgoing in the process of polaroid and be lost.But, the loss of this luminous power very little (be 0.1% for 30dB extinction ratio), negligible.
As the first structure of the present invention, the Faraday device 100 introduced before Fig. 5 specifically describes.In order to the object simplified, in figure, eliminate magnet ring 101 and 102.The faraday components 103,104 be made up of the paramagnetic material of negative Wei Dete constant, such as TGG crystal, is placed on magnetic and is being parallel to Z-direction, but in opposition to each other two magnetic fields.Therefore their sense of rotation is clockwise direction (forward) and counter-clockwise direction (oppositely) separately.By material and the shape of the length and magnet ring of selecting suitable faraday components, the absolute rotation angle of faraday components 103 and 104 is similarly 22.5 degree.There is deviation in half-wave plate 105, be placed between two faraday components on thickness, and its main shaft 501 becomes-22.5 degree angle (being rotated counterclockwise 22.5 degree from X-direction) with X-axis.
What Fig. 5 A showed is the schematic diagram (parallel and Z axis) of linearly polarized light forward by Faraday device 100.As shown in figure midplane 503, incident light is the linearly polarized light that polarization state is parallel to Y-axis.Its polarization state in each plane is presented in four polarization state charts.Emergent light is elliptically polarized light, and its main optical axis is X-axis, and secondary optical axis is Y-axis, as shown in plane 503.Same, if incident light is the linearly polarized light being parallel to X-axis, its emergent light is the parallel and Y-axis of main optical axis, and secondary optical axis is parallel to the elliptically polarized light of X-axis.
What Fig. 5 B showed is the schematic diagram (be anti-parallel to Z axis) of linearly polarized light back through Faraday device 100.As shown in figure midplane 504, incident light is the linearly polarized light of polarization state along X-direction.Incident light is before reaching half-wave plate 105, and its polarization state is first rotated-22.5 degree by faraday components 104, makes it be parallel to the main shaft of half-wave plate 105.Therefore, this linearly polarized light is still linearly polarized light after passing through half-wave plate 105.Then, its polarization state is rotated 22.5 degree by faraday components 103, and the light of finally outgoing from Faraday device 100 is the linearly polarized light being parallel to X-axis.The polarization state of light in each plane is presented at each polarization state icon.Equally, if the polarization state of the linearly polarized light of incidence is parallel to Y-axis, emergent light is still for being parallel to the linearly polarized light of Y-axis.
Fig. 6 is the second structure of this invention, the Faraday device 200 before introduced.In order to the object simplified, in figure, eliminate magnet ring 201,202 and 203.The faraday components 204,205,206 be made up of the paramagnetic material of negative Wei Dete constant, such as TGG crystal, be placed on magnetic and be parallel to Z-direction, but in opposition to each other three magnetic fields.Therefore their sense of rotation is clockwise direction (forward) and counter clockwise direction (oppositely) and clockwise direction (forward) separately.By material and the shape of the length and magnet ring of selecting suitable faraday components, faraday components 204,205, the absolute rotation angle of 206 is respectively 11.25 degree ,-22.5 degree and 11.25 degree.Half-wave plate 207 and 208 is placed between faraday components 204 and 205 respectively, between 205 and 206.Main shaft 601 direction of half-wave plate 207 becomes-11.25 to spend angle with X-axis, and main shaft 602 direction of half-wave plate 208 becomes 11.25 degree with X-axis, and the angle between the main shaft 601 and 602 of also therefore two half-wave plates is 22.5 degree.
What Fig. 6 A showed is the schematic diagram (parallel and Z axis) of linearly polarized light forward by Faraday device 200.As shown in figure midplane 603, incident light is the linearly polarized light that polarization state is parallel to Y-axis.Its polarization state in each plane is presented in six polarization state charts.Emergent light is elliptically polarized light, and its main optical axis is X-axis, and secondary optical axis is Y-axis, as shown in plane 604.Same, if incident light is the linearly polarized light being parallel to X-axis, its emergent light is that main optical axis is parallel to Y-axis, and secondary optical axis is parallel to the elliptically polarized light of X-axis.
What Fig. 6 B showed is the schematic diagram (be anti-parallel to Z axis) of linearly polarized light back through Faraday device 100.As shown in figure midplane 605, incident light is the linearly polarized light of polarization state along X-direction.Its polarization state is first rotated 11.25 degree by faraday components 206, makes its polarization state be parallel to the main shaft 602 of half-wave plate 208.Therefore, this linearly polarized light is still linearly polarized light after passing through half-wave plate 208.Then, its polarization state is rotated-22.5 degree by faraday components 205, makes its polarization state be parallel to the main shaft 601 of half-wave plate 207, is still linearly polarized light equally after passing through half-wave plate 207.Then, under the effect of faraday components 204 below, rotate 11.25 degree, the light of finally outgoing from Faraday device 200 is the linearly polarized light being parallel to X-axis.The polarization state of light in each plane is presented in each polarization state icon.Equally, if the polarization state of the linearly polarized light of incidence is parallel to Y-axis, emergent light is still for being parallel to the linearly polarized light of Y-axis.
In sum, the linearly polarized light that polarization state is parallel to X or Y-axis is converted into the elliptically polarized light of main shaft perpendicular to initial polarization direction after forward is by the Faraday device of the present invention.And back through after the Faraday device of the present invention, be still linearly polarized light, and the polarization direction of polarization state is constant.
Faraday device of the present invention can be used in dissimilar optoisolator.Figure 7 shows that this Faraday device invented is preferably to the optical isolator structure of the insensitive a kind of fiber-to-fiber of polarization state.This optoisolator assembly vertically comprises: the optical fiber collimator 701 light being transferred to from optical fiber free space; Unwanted light beam is stoped to return to the light hurdle of collimating apparatus; First light beam and ripple/channel-splitting filter 703; The Faraday device 704 of the present invention; Second light beam that thickness is identical with ripple/channel-splitting filter 703 with first and ripple/channel-splitting filter 705; Unwanted light beam is stoped to incide the output light hurdle 706 of output collimator; And by the output collimator 707 during light beam is from free space transmission to optical fiber.Be made up of birefringece crystal with ripple/channel-splitting filter for first and second, such as YV04.Be processed to principal section with ripple/channel-splitting filter and be parallel to Y-Z axial plane, meanwhile, during placement, require that their optical axis 708 and 709 is parallel to each other.
Fig. 7 A is depicted as the schematic diagram (parallel and Z axis) of the optoisolator that light forward is invented by this.Common polarized light changes directional light 710 by after optical fiber incidence into through optical fiber collimator 701.Point in light and bar represent in light beam two polarization states being parallel to x-axis and y-axis respectively.Through hole and the light beam 710 on light hurdle 702 align, and therefore light beam 710 can incide first and ripple/channel-splitting filter 703 by light hurdle.Partial wave/with the effect of ripple device is the wave plate be separated by light polarization.Light beam 710 is being separated into two bunch polarized lights through first and ripple/channel-splitting filter back immediately.First bunch polarized light is common light (O-ray), and a branch of polarized light is non-generic light (E-ray) in addition.In first and ripple/channel-splitting filter, E-ray separates from O-ray with the polarization state perpendicular to O-ray, is finally divided into 711 and 712 two components from the emergent light first and ripple/channel-splitting filter 703.Component 711 is for being parallel to the linearly polarized light (being denoted as a little) of X-axis, and component 712 is for being parallel to the linearly polarized light (being denoted as bar) of Y-axis.
Then, two components 711 and 712, when the Faraday device 704 invented by this along forward, as previously discussed, are converted into two bundle elliptically polarized lights 713 and 714.The main optical axis of light beam 713 is parallel to Y-axis (being denoted as bar equally), and the main optical axis of light beam 714 is parallel to X-axis (being denoted as equally a little).This two-beam line is broken down into two components, main optical axis and secondary optical axis again respectively when through second partial wave/and ripple device 705.The main optical axis of beam component 713 is non-generic light (E-ray), and therefore, it is vertically to separate and to transmit towards light beam 714 direction.And the main optical axis of light beam 714 is common light (O-ray), therefore its main optical axis is along light beam 714 original direction transmission.Finally, these two main optical axises are merged into Ray Of Light 715 relaying and resume defeated, and by exporting light hurdle 706, the optical fiber collimator 707 finally through exporting is coupled in output optical fibre.
The secondary optical axis (indicating dotted line a little) of light beam 713 is common light (O-ray) in second and ripple/channel-splitting filter, and therefore it is along original direction transmission of light beam 713, is finally output light hurdle 706 and blocks.And the secondary optical axis of light beam 714 (indicating the dotted line of bar) is non-generic light (E-ray) in second and ripple/channel-splitting filter, therefore it is separated along the direction original perpendicular to light beam 714, and is finally output the blocking-up of light hurdle equally.Energy due to this two-beam line is the sub-fraction of whole Transmission Fibers energy, and therefore caused power attenuation is very little.
What Fig. 7 B introduced is light is (the being anti-parallel to Z axis) principle of isolator of being invented by this oppositely.Common polarized light changes directional light 716 by after optical fiber incidence into through optical fiber collimator 707.Point in light and bar represent in light beam two polarization states being parallel to x-axis and y-axis respectively.Through hole and the directional light 716 on light hurdle 706 align, and therefore light beam 710 can incide second and ripple/channel-splitting filter 705 by light hurdle.The half-wave plate that light polarization is separated with the effect of ripple/channel-splitting filter.Polarized light 716 is being separated into two bunch polarized lights through second and ripple/channel-splitting filter back immediately.First bunch polarized light is common light (O-ray), and a branch of polarized light is non-generic light (E-ray) in addition.In first and ripple/channel-splitting filter, E-ray separates from O-ray with the polarization state perpendicular to O-ray, is finally divided into 711 and 712 two components from the emergent light first and ripple/channel-splitting filter 703.Component 711 is for being parallel to the linearly polarized light (being denoted as a little) of X-axis, and component 712 is for being parallel to the linearly polarized light (being denoted as bar) of Y-axis.
Then, two components 717 and 718 are when along the Faraday device 704 invented back through this, and as front introduction, their polarization state and polarization direction all remain unchanged.Therefore, component 717 and 718 can not be again separated in first and ripple/channel-splitting filter 703, but transmit in first and ripple/channel-splitting filter according to common light (O-ray) and non-generic light (E-ray) separately.Component 717 is a branch of E-ray, and therefore it advances along the direction perpendicular to original transmission, and is finally transfused to light hurdle 702 and blocks.And component 718 is a branch of O-ray, therefore it continues transmission along former direction, is equally finally transfused to light hurdle and blocks.Net result is that the luminous energy of reverse transfer is all blocked, and therefore can realize the isolation of maximum possible.
Claims (5)
1. an implementation method for Faraday, is characterized in that, for realizing most High Extinction Ratio, described method is, makes the half-wave plate of backlight between optically-active element, and the polarization state of polarized light is just in time parallel with the optical axis of half-wave plate or become 90 degree.
2. the implementation method of Faraday according to claim 1, is characterized in that, described optically-active element comprises faraday components and magnet ring, and faraday components is located in magnet ring, and the axle center of faraday components and magnet ring axle center are at same axis.
3. a Faraday device, is characterized in that, described Faraday device comprises faraday components, magnet ring and half-wave plate; Faraday components is located in magnet ring, and the axle center of faraday components and magnet ring axle center on the same axis, form an optically-active element; Two or more optically-active element magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
4. Faraday device according to claim 3, is characterized in that, described optically-active element is two, and optically-active element magnetic pole reversed arrangement each other vertically, on the axis between two optically-active elements, is provided with half-wave plate.
5. Faraday device according to claim 3, is characterized in that, described optically-active element is three, and optically-active element magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
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| CN103869507B (en) * | 2012-12-07 | 2017-09-01 | 高值光电股份有限公司 | Faraday rotator and isolator |
| CN103278943B (en) * | 2013-03-29 | 2016-01-27 | 北京航空航天大学 | A kind of Faraday rotator being applicable to high-power optoisolator |
| CN103913857B (en) * | 2014-04-01 | 2017-04-12 | 浙江奥智光电科技有限公司 | Optical isolation method and optical isolation device |
| US9823500B2 (en) * | 2014-06-23 | 2017-11-21 | Lightel Technologies, Inc. | Optical assembly for 90° polarization rotation |
| CN105511121B (en) * | 2016-02-02 | 2018-01-26 | 珠海光库科技股份有限公司 | Optoisolator |
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| JP2003287713A (en) * | 2002-03-27 | 2003-10-10 | Shin Etsu Chem Co Ltd | Optical isolator |
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