CN102798989A - Faraday optical rotation method and device, and optical isolation method and device using Faraday optical rotation device - Google Patents
Faraday optical rotation method and device, and optical isolation method and device using Faraday optical rotation device Download PDFInfo
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Abstract
The invention discloses a Faraday optical rotation method and a device, and an optical isolation method and a device using the Faraday optical rotation device. The Faraday optical rotation method is characterized in that the polarization state of a polarized light is rightly parallel with or has an angle of 90 DEG with an optical axis of a glass plate when a reversal light passes through the glass plate between optical rotation elements. The Faraday optical rotation device comprises a Faraday element, a magnetic ring and a half-wave plate, wherein the Faraday element is arranged in the magnetic ring, and the axis of the Faraday element and the axis of the magnetic ring are arranged on the same axis to form one optical rotation element; more than two rotation elements with opposite magnetic poles are arranged along the axial direction; and the half-wave plate is arranged on the axis between two adjacent optical rotation elements. The optical isolation method is characterized in that the reversal light passes through the Faraday optical rotation device and then is separated into positive light paths by a polarized splitting crystal and blocked. The light isolation device comprises an input optical fiber collimator, an input diaphragm, a first wave combiner/separator, the Faraday optical rotation device, a second wave combiner/separator, an output diaphragm and an output optical fiber collimator.
Description
Technical field
The present invention relates to the magnetic-optic devices technology in the systems such as laser instrument or optical communication, particularly the Faraday device correlation technique in the optoisolator.
Background technology
The Faraday device is present optoisolator key issue in application device.Yet; At present known Faraday material is all very little to the Verdet constant (Verdet Constant) in the 1 mum wavelength scope at visible light 400nm, and this just makes magnetic field intensity that optoisolator product needed in this wavelength coverage is very high and a large amount of faraday's crystal.Thereby, high and difficult production of optoisolator cost of products that has also caused this wavelength coverage.As the topmost application-fiber laser technology of this wave band, becoming the mainstream technology of industrial laser.The application of aspects such as it is up to standard in materials processing, laser, laser weapon is just in develop rapidly.In this year, country has also strengthened input and the support to fiber laser technology.And isolator has become and has limited one of its fast-developing bottleneck.
The research of related fields is:
" electronic technology ", 2009 (02): this paper of 31-32. introduces the method for designing of miniature broadband optoisolator.Optoisolator comprises the relevant miniaturization optoisolator with polarization of the online optoisolator of polarization independent type.Common polarization independent optical isolator generally all need split into o light and e light two parts with light, and this just must must use the polarized beam splitting device.Polarized beam splitting device commonly used has two kinds: 1. birefringence wedge shape crystal; 2. the birefringence one type crystal of parallel beam splitter.They have significant disadvantages: the former can make o light and the light path of e light in crystal different, produces the chromatic dispersion of nature polarizing coating, must must add polarizing coating dispersion compensation sheet, has so not only increased cost but also has increased the volume of isolator.Though the latter can make o, e light light path identical, the volume of crystal own is excessive, is difficult to satisfy now optical communication system to the requirement of device miniaturization.For this reason; Designed a kind of polarizing coating dispersion compensation sheet that need not; And behind faraday rotator, add the miniature bandwidth optoisolator that quarter wave plate or full-wave plate reach the spread bandwidth purpose, and overcome above both shortcoming, not only reduced the reverse isolation degree; And the isolation scope of 50dB optoisolator is become more than about 80dB, so be called the miniature broadband optoisolator.
And for example:
" laser and infrared ", 2006 (02): 125-127. this article has proposed a kind of design proposal of miniaturization optoisolator, it realizes principle and each optical parametric through theoretical analysis, and by experiment confirm the validity of this scheme.Design result shows, is guaranteeing under the good parameter situation of acquisition, adopts this scheme can make optical isolator structure compacter, and effectively reduces its cost and assembly difficulty.Behind quarter wave plate and the rotatory dispersion characteristic compensation of full-wave plate to faraday rotator; Can make the isolation parameter of this device insensitive with wavelength change, in addition, owing to adopt the light path design of symmetry; The polarization mode dispersion theoretical value of this scheme is 0, need not extra compensation.
For another example:
Publication number is in CN1389991 [P] patent of invention; A kind of method and broadband light isolator thereof that increases isolator isolation bandwidth is provided; The angular dispersion of Faraday crystal is converted into the phase change of polarized light, reduces phase change with full-wave plate then, thereby eliminate the variation of the device isolation degree that the angular dispersion by the Faraday crystal causes; The bandwidth of isolator is increased, and isolation increases.Its broadband light isolator is made up of polarizing beam splitter, Faraday crystal, polarization splicer and full-wave plate and λ/4 wave plates between polarization branch, splicer.
For another example:
Publication number is in the utility model patent of CN201859277U [P], and a kind of optoisolator that is used for optical fiber communication is characterized in that the forward polarization state Control Component, barrier assembly and the negative polarization state Control Component that are parallel to each other and place along optical direction successively; First linear polarizer and first quarter-wave plate of forward polarization state Control Component for being parallel to each other and placing along optical direction successively; First high reflectance reflecting body, Faraday device and second high reflectance reflecting body and the permanent magnet of barrier assembly for being parallel to each other and placing along optical direction successively; Second quarter-wave plate and second linear polarizer of negative polarization state Control Component for being parallel to each other and placing along optical direction successively.Beneficial effect: the small size variation of faraday's rotation angle is the serious performance of deterioration optoisolator not, has reduced the requirement to Faraday magneto-optical material temperature stability; Only utilize single-stage to isolate the requirement that just realizes the above isolation of 40-65dB; Light does not produce transversal displacement, and light path is short, can realize miniaturization of devices.
Technology contents
The present invention seeks to deficiency to above prior art; Provide a kind of polarization state light that allows linearly polarized light to be parallel to main shaft to pass through; To get rid of because the caused extinction ratio deterioration of half-wave plate machining precision; So that the extinction ratio of maximum possible to be provided, and also can realize the isolation of maximum possible, the Faraday apparatus structure of working stability based on the isolator of this kind Faraday device.
The object of the invention can be realized through following technical scheme: a kind of implementation method of Faraday; For realizing High Extinction Ratio; Said method is that when making backlight through the slide between the optically-active element, the polarization polarization state of light is just in time parallel with the optical axis of slide or become 90 to spend.
The implementation method of described Faraday, its optically-active element comprises faraday components and magnet ring, and faraday components is located in the magnet ring, and the axle center of faraday components and magnet ring axle center are at same axis.
The implementation method of described Faraday, its said slide is a half-wave plate.
A kind of Faraday device, its Faraday device comprises faraday components, magnet ring and half-wave plate; Faraday components is located in the magnet ring, and an optically-active element is formed in the axle center of faraday components and magnet ring axle center on same axis; Two above optically-active elements are 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, the optically-active element is 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, the optically-active element is magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
A kind of light partition method of using the Faraday device be to realize the isolation of light, and said method does, backlight through the Faraday device after, by the polarization spectro crystal backlight is separated the forward light path, and with its obstruction.
A kind of light spacer assembly that uses the Faraday device, its light spacer assembly comprises:
Polarized light is changed common polarized light the input optical fibre collimating apparatus of directional light into after by optical fiber input;
Stop unwanted light beam to return the input light hurdle of collimating apparatus;
First and ripple/channel-splitting filter with the light polarization separation;
The Faraday device;
Second and ripple/channel-splitting filter with the light polarization separation;
Stop unwanted light beam to return the output light hurdle of collimating apparatus;
Light is outputed to the output optical fibre collimating apparatus that is coupled in the output optical fibre.
The light spacer assembly of described use Faraday device, in its light spacer assembly first and ripple/channel-splitting filter and second and the optical axis principal section of ripple/channel-splitting filter be parallel to each other.
The invention has the advantages that; Provide a kind of polarization state light that allows linearly polarized light to be parallel to main shaft to pass through; To get rid of because the caused extinction ratio deterioration of half-wave plate machining precision; So that the extinction ratio of maximum possible to be provided, and also can realize the isolation of maximum possible based on the isolator of this kind Faraday device, the Faraday apparatus structure of working stability is promptly used this polarization apparatus optoisolator.
Description of drawings
The sectional drawing synoptic diagram of the Faraday device that Fig. 1 is made up of two opposite magnetic magnet rings for the present invention;
The sectional drawing synoptic diagram of the Faraday device that Fig. 2 is made up of three opposite magnetic magnet rings for the present invention;
Fig. 3 A for line polarization light of the present invention through desirable, become the synoptic diagram of the half-wave plate of miter angle with the wave plate main shaft;
Fig. 3 B for line polarization light of the present invention through incomplete, become the synoptic diagram of the half-wave plate of miter angle with the wave plate main shaft;
Fig. 4 A is parallel to the synoptic diagram of the linearly polarized light of the fast axle of half-wave plate through half-wave plate for polarization state of the present invention;
Fig. 4 B is parallel to the synoptic diagram of the linearly polarized light of half-wave plate slow axis through half-wave plate for polarization state of the present invention;
The Faraday device that Fig. 5 A is made up of two faraday components for the present invention and the polarized light forward of single polarization state pass through the sectional drawing synoptic diagram of this optically-active device;
The sectional drawing synoptic diagram of this optical rotation plate that the Faraday device that Fig. 5 B is made up of two faraday components for the present invention and the polarized light of single polarization state oppositely pass through;
Fig. 6 A is the sectional drawing synoptic diagram of this optically-active device of passing through of the polarized light forward of the Faraday device of being made up of three faraday components of the present invention and single polarization state;
The sectional drawing synoptic diagram of this optically-active device that the Faraday device that Fig. 6 B is made up of three faraday components for the present invention and the polarized light of single polarization state oppositely pass through;
Fig. 7 A is an optoisolator of the present invention, and the light beam forward is through the cutaway side view synoptic diagram of this isolator;
Fig. 7 B is an optoisolator of the present invention, and light beam oppositely passes through the cutaway side view synoptic diagram of this isolator.
Embodiment
The Faraday device is a kind of magnetic-optic devices, is made up of faraday components and magnet ring.Magnet ring is that faraday components provides the magnetic field that is used to produce Faraday effect.Through this Faraday effect, can make different polarization states generation deflection through the light of Faraday device.Because the one-way of this deflection, the Faraday device can be applied in the optoisolator.This optoisolator can only allow forward light to pass through, and stops retrodirected ray to pass through, to guarantee the stability of whole laser system.When the Faraday device is used to optoisolator, the angle of forward and reverse rotation be necessary for 90 degree, isolated to guarantee backlight; The computing formula of following faraday's deflection angle:
Wherein, L represents the length of faraday components, and V represents the Verdet constant of faraday components, and H represents the magnetic field on the optical transmission direction.In the 1um wavelength coverage, the Verdet constant of transparent paramagnetic material that can be used as faraday components is all very little at visible light.Therefore, in this section wavelength coverage, need very strong magnetic field could realize needed faraday's anglec of rotation.
For obtaining to be used to produce the high-intensity magnetic field of Faraday effect; Its method that obtains high-intensity magnetic field is at a plurality of magnet rings that are magnetized to opposite magnetic pole of axial array; Because this compound magnetic field that magnet ring produced is that independent magnetic field is overlapping forms by each, therefore can produce the magnetic field more much better than than single magnet ring.Also therefore, the size of this magnet ring array is much littler than the independent magnet ring that produces same intensity magnetic field.In this compound magnet ring, the direction of faraday's rotation is by the magnetic direction of reversed arrangement decision each other vertically.Therefore, except magnet ring and faraday components, also need in the middle of two adjacent optically-active elements, put into faraday's yawing moment that half-wave plate could be realized setting.Half-wave plate is a birefringece crystal that has specific direction and thickness in essence.Its function is the equal of a speed reduction unit of polarization state that can change through its light wave.When there was deviation in half-wave plate on thickness, it can change into linearly polarized light the elliptically polarized light of low extinction ratio, and then had reduced the extinction ratio of Faraday device.Therefore, can be subject to its extinction ratio based on the isolation of the optoisolator of this kind Faraday device.
In Fig. 1, digital 100 marks are first kind of one-piece construction of this Faraday device, have wherein comprised two coaxial magnet rings 101,102, pass through the hole for light in the middle of the magnet ring; Light is through being two faraday components 103,104 that are made up of paramagnetic material in the hole, and is placed on two half-wave plates 105 between the optically-active element.Opposite among the figure through representing magnetic pole letter N and S can show that but magnet ring 101 and 102 is placed as coaxial magnetic pole, therefore in through hole, can obtain very strong magnetic field.
In Fig. 2, digital 200 marks are second kind of one-piece construction of this Faraday device, have wherein comprised three coaxial magnet rings 201,202 and 203, pass through the hole for light in the middle of the magnet ring.Be three optically-active elements 204,105 and 206 that constitute by paramagnetic material in the through hole, and be placed on two half- wave plates 207 and 208 between the optically-active element.Equally, in order in through hole, to obtain high-intensity magnetic field, magnet ring 201, but 202 and 203 to be placed as between the coaxial and adjacent magnet ring magnetic pole opposite.
Such as before description, half-wave plate is the core parts of this improved Faraday device.Half-wave plate is to be processed by the birefringece crystal material, and according to its optical axis direction be parallel to the surface structure cuts form.When ordinary refractive index during less than extraordinary refractive index, for example quartzy, optical axis is called " fast axle "; And conversely, the direction on vertical surface plane then is called as slow axis.Fast axle and slow axis all are called as the main shaft of wave plate.The polarization state transmission speed that is parallel to fast axle in the light produces phase differential thus faster than the polarization state perpendicular to fast axle.For the slide of different-thickness, can produce the emergent light of different polarization states through two axial light of polarizer.
Half-wave plate can postpone a polarization state half-wavelength or 180 degree phase differential, therefore can change the polarization direction of linearly polarized light.Shown in Fig. 3 A,, postpone half-wavelength just for the synoptic diagram of linearly polarized light through desirable half-wave plate 301.The position that half-wave plate 301 is placed is that main shaft 302 is vertical with the Z axle, all becomes miter angle with X, Y axle simultaneously.Shown in 303, incident light is that transmission direction is parallel with the Z axle, the linearly polarized light that the polarization direction is parallel with the Y axle.Shown in 304, emergent light still is a linearly polarized light, but polarization state has been turned to the other one side (polarization direction is parallel with the X axle) of main shaft.
In the reality, because the restriction of machining precision, always there is deviation in the thickness of half-wave plate.Consider this factor, Fig. 3 B is depicted as the upset result behind there is deviation in linearly polarized light in the reality through thickness the half-wave plate.Thickness exists the half-wave plate 305 of deviation and laying method before just the same, and its main shaft 305 all becomes miter angle with X, Y axle.The elliptically polarized light that it was described before identical incident light is changed into, the main optical axis of its elliptically polarized light are parallel to X axle (along the upset of half-wave plate main shaft), and less important optical axis is parallel with the Y axle simultaneously, 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 and less important optical axis of elliptically polarized light respectively.The ratio that accounts for whole luminous powers at less important optical axis glazing power component is referred to as the extinction ratio of this elliptically polarized light.For example, if the ratio of the general power of elliptical light and the luminous power of less important optical axis is 1000:1, then the extinction ratio of this elliptically polarized light is 1000, perhaps 30dB.Same, the extinction ratio of a branch of linearly polarized light is infinitely great.When the extinction axis of polaroid was parallel to the primary optical axis of polarized light, extinction ratio had determined the degree of isolation of polarized light.Illustrating, is the elliptically polarized light of 30dB for a branch of extinction ratio, and after passing through desirable polaroid, it can be isolated into 0.01 of incident optical power, and a branch of desirable linearly polarized light then can be isolated fully.
And when the spindle parallel of polarization of incident light attitude and half-wave plate (no matter fast axle or slow axis), emergent light is still linearly polarized light, and this thickness with half-wave plate has nothing to do.Shown in Fig. 4 A, thickness exists the half-wave plate of deviation to be placed as fast axle perpendicular to the Z axle, and the time spent is parallel to the Y axle.When the linear polarization polarization state of light of incident is parallel to Y axle (fast axle) equally, shown in Fig. 4 A midplane 403, emergent light is still linearly polarized light shown in plane 404, and its polarization state is parallel to Y axle (not overturning).Equally, if the polarization of incident light attitude along X-direction (slow axis), like Fig. 4 B midplane 405, emergent light is still linearly polarized light shown in plane 406, its polarization state still is parallel to X axle (slow axis).
Principle of the present invention is exactly the half-wave plate main shaft of arranging in the Faraday device, make when linearly polarized light oppositely pass through to be invented draw the 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, to reach the effect of being isolated by polaroid fully from the light of this Faraday device outgoing.Because the extinction ratio that the half-wave plate machining precision causes can be got rid of fully, invents the light isolation that the isolator that is the basis can be realized maximum possible with this Faraday device.Simultaneously, the linearly polarized light that passes through of forward is then changed into elliptically polarized light by this Faraday device.Therefore, when light beam when this isolator, upload in defeated light vector is coupled to polaroid after outgoing the process at less important optical axis and to be lost.But the loss of this luminous power very little (is 0.1% for the 30dB extinction ratio) can be ignored.
As first kind of structure of the present invention, the Faraday device 100 that Fig. 5 had introduced before having specifically described.For the purpose of simplifying, magnet ring 101 and 102 have been omitted among the figure.By the faraday components 103,104 that the paramagnetic material of negative Wei Dete constant is processed, for example the TGG crystal is placed on magnetic and is being parallel to Z-direction, but in two magnetic fields in opposition to each other.Therefore respectively do for oneself CW (forward) and counter-clockwise direction (oppositely) of their sense of rotation.The length through selecting suitable faraday components and the material and the shape of magnet ring, the faraday components 103 and 104 the absolute anglec of rotation are similarly 22.5 degree.There is deviation in half-wave plate 105 on thickness, be placed between two faraday components, and its main shaft 501 becomes-22.5 degree angles (being rotated counterclockwise 22.5 degree from X-direction) with the X axle.
What Fig. 5 A showed is the schematic diagram (parallel and Z axle) of linearly polarized light forward through Faraday device 100.As scheme shown in the midplane 503, incident light is the linearly polarized light that polarization state is parallel to the Y axle.Its polarization state on each plane all is presented in four polarization state charts.Emergent light is an elliptically polarized light, and its main optical axis is the X axle, and less important optical axis is the Y axle, shown in plane 503.Same, if incident light is the linearly polarized light that is parallel to the X axle, its emergent light is the parallel and Y axle of main optical axis, less important optical axis is parallel to the elliptically polarized light of X axle.
Fig. 5 B shows is the oppositely schematic diagram (being anti-parallel to the Z axle) through Faraday device 100 of linearly polarized light.As scheme shown in the 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 by faraday components 104 rotations-22.5 degree, makes it be parallel to the main shaft of half-wave plate 105 earlier.Therefore, this linearly polarized light still is a linearly polarized light passing through behind the half-wave plate 105.Then, its polarization state is by faraday components 103 rotations 22.5 degree, and the light of final outgoing from Faraday device 100 is the linearly polarized light that is parallel to the X axle.The polarization state of light on each plane is presented at each polarization state icon.Equally, if the linear polarization polarization state of light of incident is parallel to the Y axle, emergent light is still for being parallel to the linearly polarized light of Y axle.
Fig. 6 is second kind of structure of this invention, the Faraday device of before introducing 200.For the purpose of simplifying, magnet ring 201,202 and 203 have been omitted among the figure.By the faraday components 204,205,206 that the paramagnetic material of negative Wei Dete constant is processed, for example the TGG crystal is placed on magnetic and is being parallel to Z-direction, but in three magnetic fields in opposition to each other.Therefore respectively do for oneself CW (forward) and counter clockwise direction (oppositely) and CW (forward) of their sense of rotation.The length through selecting suitable faraday components and the material and the shape of magnet ring, faraday components 204,205,206 the absolute anglec of rotation is respectively 11.25 degree, and-22.5 degree are spent with 11.25.Half- wave plate 207 and 208 is placed on respectively between faraday components 204 and 205, between 205 and 206.Main shaft 601 directions of half-wave plate 207 become-11.25 degree angles with the X axle, and main shaft 602 directions of half-wave plate 208 become 11.25 degree with the X axle, and also therefore the angle between the main shaft 601 and 602 of two half-wave plates is 22.5 degree.
What Fig. 6 A showed is the schematic diagram (parallel and Z axle) of linearly polarized light forward through Faraday device 200.As scheme shown in the midplane 603, incident light is the linearly polarized light that polarization state is parallel to the Y axle.Its polarization state on each plane all is presented in six polarization state charts.Emergent light is an elliptically polarized light, and its main optical axis is the X axle, and less important optical axis is the Y axle, shown in plane 604.Same, if incident light is the linearly polarized light that is parallel to the X axle, its emergent light is that main optical axis is parallel to the Y axle, less important optical axis is parallel to the elliptically polarized light of X axle.
Fig. 6 B shows is the oppositely schematic diagram (being anti-parallel to the Z axle) through Faraday device 100 of linearly polarized light.As scheme shown in the midplane 605, incident light is the linearly polarized light of polarization state along X-direction.Its polarization state by faraday components 206 rotations 11.25 degree, makes its polarization state be parallel to the main shaft 602 of half-wave plate 208 earlier.Therefore, this linearly polarized light still is a linearly polarized light passing through behind the half-wave plate 208.Then, its polarization state is made its polarization state be parallel to the main shaft 601 of half-wave plate 207 by faraday components 205 rotations-22.5 degree, still is linearly polarized light passing through behind the half-wave plate 207 equally.Then, 11.25 degree are rotated in the effect of faraday components 204 down in the back, and the light of final outgoing from Faraday device 200 is the linearly polarized light that is parallel to the X axle.The polarization state of light on each plane is presented in each polarization state icon.Equally, if the linear polarization polarization state of light of incident is parallel to the Y axle, emergent light is still for being parallel to the linearly polarized light of Y axle.
In sum, the polarization state linearly polarized light that is parallel to X or Y axle is changed into the elliptically polarized light of main shaft perpendicular to initial polarization direction after forward is through the Faraday device of the present invention.And oppositely through behind the Faraday device of the present invention, still be linearly polarized light, and the polarization direction of polarization state is constant.
Faraday device of the present invention can be used in the dissimilar optoisolators.Shown in Figure 7 is that the Faraday device of this invention 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 that light is transferred to free space from optical fiber; Stop unwanted light beam to return 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; Stop unwanted light beam to incide the output light hurdle 706 of output collimator; And light beam is transferred to the output collimator 707 the optical fiber from free space.First is processed by birefringece crystal with second and ripple/channel-splitting filter, for example YVO4.And ripple/channel-splitting filter is processed to the principal section and is parallel to the Y-Z axial plane, simultaneously, requires their optical axis 708 and 709 to be parallel to each other during placement.
Fig. 7 A is depicted as the schematic diagram (parallel and Z axle) of light forward through the optoisolator of this invention.Common polarized light by optical fiber input after optical fiber collimator 701 changes directional light 710 into.Point in the light and bar are represented two polarization states that are parallel to x axle and y axle in the light beam respectively.710 alignment of the through hole on light hurdle 702 and light beam, so light beam 710 can incide first and ripple/channel-splitting filter 703 through the light hurdle.Partial wave/with the effect of ripple device is the wave plate that light polarization is separated.Light beam 710 is being separated into two bunch polarized lights through first and ripple/channel-splitting filter back immediately.The first bunch polarized light is normal optical (O-ray), and a branch of in addition polarized light is non-normal optical (E-ray).In first and ripple/channel-splitting filter, E-ray separates from O-ray with the polarization state perpendicular to O-ray, and finally the emergent light from first and ripple/channel-splitting filter 703 is divided into 711 and 712 two components.Component 711 is the linearly polarized light (being denoted as a little) that is parallel to the X axle, and component 712 is for being parallel to the linearly polarized light (being denoted as bar) of Y axle.
Then, two components 711 and 712 like the introduction of front institute, are converted into two and restraint elliptically polarized lights 713 and 714 along the Faraday device 704 of forward through this invention the time.The main optical axis of light beam 713 is parallel to Y axle (being denoted as bar equally), and the main optical axis of light beam 714 is parallel to X axle (being denoted as a little equally).This two-beam line is again respectively through second partial wave/be broken down into when the ripple device 705 two components, main optical axis and less important optical axis.The main optical axis of beam component 713 is non-normal optical (E-ray), and therefore, it is to separate along vertical direction and to transmit towards light beam 714 directions.And the main optical axis of light beam 714 is normal optical (O-ray), so its main optical axis is along light beam 714 original direction transmission.Finally, these two main optical axises merge to and continue transmission in the Ray Of Light 715, and through output light hurdle 706, final optical fiber collimator 707 through output is coupled in the output optical fibre.
The less important optical axis of light beam 713 (indicating dotted line a little) is normal optical (O-ray) in second and ripple/channel-splitting filter, so it is along original direction transmission of light beam 713, finally by 706 blocking-up of output light hurdle.And the less important optical axis of light beam 714 (indicating the dotted line of bar) is non-normal optical (E-ray) in second and ripple/channel-splitting filter, so it is along separating perpendicular to light beam 714 original directions, and finally equally by the hurdle blocking-up of output light.Because the energy of this two-beam line is the sub-fraction of whole Transmission Fibers energy, the power attenuation that is therefore caused is very little.
What Fig. 7 B introduced is the principle of light reverse (being anti-parallel to the Z axle) through the isolator of this invention.Common polarized light by optical fiber input after optical fiber collimator 707 changes directional light 716 into.Point in the light and bar are represented two polarization states that are parallel to x axle and y axle in the light beam respectively.The through hole on light hurdle 706 and directional light 716 alignment, so light beam 710 can incide second and ripple/channel-splitting filter 705 through the light hurdle.With the effect of ripple/channel-splitting filter is the wave plate that light polarization is separated.Polarized light 716 is being separated into two bunch polarized lights through second and ripple/channel-splitting filter back immediately.The first bunch polarized light is normal optical (O-ray), and a branch of in addition polarized light is non-normal optical (E-ray).In first and ripple/channel-splitting filter, E-ray separates from O-ray with the polarization state perpendicular to O-ray, and finally the emergent light from first and ripple/channel-splitting filter 703 is divided into 711 and 712 two components.Component 711 is the linearly polarized light (being denoted as a little) that is parallel to the X axle, and component 712 is for being parallel to the linearly polarized light (being denoted as bar) of Y axle.
Then, two components 717 and 718 along reverse Faraday device 704 through this invention the time, such as the front introduction, their polarization state and polarization direction all remain unchanged.Therefore, component 717 and 718 can be not separated once more in first and ripple/channel-splitting filter 703, but transmit in first and ripple/channel-splitting filter according to normal optical (O-ray) and non-normal optical (E-ray) separately.Component 717 is a branch of E-ray, so it is along advancing perpendicular to the direction of original transmission, and finally is transfused to 702 blocking-up in light hurdle.And component 718 is a branch of O-ray, so it equally finally is transfused to the light hurdle and blocks along original direction continuation transmission.Final result is that the luminous energy of reverse transfer is blocked all, therefore can realize the isolation of maximum possible.
Claims (9)
1. the implementation method of a Faraday is characterized in that, for realizing High Extinction Ratio, said method does, when making backlight through the slide between the optically-active element, the polarization polarization state of light is just in time parallel with the optical axis of slide or become 90 degree.
2. the implementation method of Faraday according to claim 1 is characterized in that, said optically-active element comprises faraday components and magnet ring, and faraday components is located in the magnet ring, and the axle center of faraday components and magnet ring axle center are at same axis.
3. the implementation method of Faraday according to claim 1 is characterized in that, said slide is a half-wave plate.
4. a Faraday device is characterized in that, said Faraday device comprises faraday components, magnet ring and half-wave plate; Faraday components is located in the magnet ring, and an optically-active element is formed in the axle center of faraday components and magnet ring axle center on same axis; Two above optically-active elements are magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
5. Faraday device according to claim 4 is characterized in that, said optically-active element is two, and the optically-active element is magnetic pole reversed arrangement each other vertically, on the axis between two optically-active elements, is provided with half-wave plate.
6. Faraday device according to claim 4 is characterized in that, said optically-active element is three, and the optically-active element is magnetic pole reversed arrangement each other vertically, on the axis between adjacent two optically-active elements, is provided with half-wave plate.
7. a light partition method of using the Faraday device is characterized in that, be to realize the isolation of light, and said method does, backlight through the Faraday device after, by the polarization spectro crystal backlight is separated the forward light path, and with its obstruction.
8. a light spacer assembly that uses the Faraday device is characterized in that, said smooth spacer assembly comprises:
Polarized light is changed common polarized light the input optical fibre collimating apparatus of directional light into after by optical fiber input;
Stop unwanted light beam to return the input light hurdle of collimating apparatus;
First and ripple/channel-splitting filter with the light polarization separation;
The Faraday device;
Second and ripple/channel-splitting filter with the light polarization separation;
Stop unwanted light beam to return the output light hurdle of collimating apparatus;
Light is outputed to the output optical fibre collimating apparatus that is coupled in the output optical fibre.
9. the light spacer assembly of use Faraday device according to claim 8 is characterized in that, in the said smooth spacer assembly first and ripple/channel-splitting filter and second and the optical axis principal section of ripple/channel-splitting filter be parallel to each other.
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| CN103869507A (en) * | 2012-12-07 | 2014-06-18 | 高值光电股份有限公司 | Faraday Rotator and Isolator |
| CN103913857A (en) * | 2014-04-01 | 2014-07-09 | 深圳市艾格莱光电科技有限公司 | Optical isolation method and optical isolation device |
| CN105116562A (en) * | 2014-06-23 | 2015-12-02 | 莱特尔科技公司 | Optical assembly for 90 DEG polarization rotation |
| CN105511121A (en) * | 2016-02-02 | 2016-04-20 | 珠海光库科技股份有限公司 | Photoisolator |
| CN106353855A (en) * | 2016-11-14 | 2017-01-25 | 福建福晶科技股份有限公司 | Optical isolator at high isolation degree |
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| CN108020887B (en) * | 2016-11-04 | 2020-05-29 | 珠海光库科技股份有限公司 | Optical fiber isolator and refractive index compensation method thereof |
| CN106353855A (en) * | 2016-11-14 | 2017-01-25 | 福建福晶科技股份有限公司 | Optical isolator at high isolation degree |
| CN106707534A (en) * | 2016-12-14 | 2017-05-24 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| WO2019000833A1 (en) * | 2017-06-30 | 2019-01-03 | 深圳市创鑫激光股份有限公司 | Method for adjusting degree of isolation, optical fiber isolator, and fiber laser |
| CN107908022A (en) * | 2017-12-21 | 2018-04-13 | 珠海光库科技股份有限公司 | Fibre optic isolater and its application method |
| CN107908022B (en) * | 2017-12-21 | 2024-05-03 | 珠海光库科技股份有限公司 | Optical fiber isolator and method of use thereof |
| CN112540431A (en) * | 2020-12-17 | 2021-03-23 | 珠海光库科技股份有限公司 | Optical circulator |
| CN114355513A (en) * | 2022-01-18 | 2022-04-15 | 北京航空航天大学 | Rotary light reflector with reciprocal light path characteristic |
| WO2023168321A3 (en) * | 2022-03-02 | 2023-10-26 | Voyant Photonics, Inc. | Integrated isolator and circulator systems |
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Owner name: ZHEJIANG OZ OPTICS TECHNOLOGIES CO., LTD. Free format text: FORMER OWNER: SHENZHEN AIGELAI PHOTOELECTRIC CO., LTD. Effective date: 20150608 |
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