CN202649637U - Free-space polarization dependence type optoisolator - Google Patents
Free-space polarization dependence type optoisolator Download PDFInfo
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- CN202649637U CN202649637U CN 201220215461 CN201220215461U CN202649637U CN 202649637 U CN202649637 U CN 202649637U CN 201220215461 CN201220215461 CN 201220215461 CN 201220215461 U CN201220215461 U CN 201220215461U CN 202649637 U CN202649637 U CN 202649637U
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- polarizing film
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- 230000010287 polarization Effects 0.000 title claims abstract description 92
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000010408 film Substances 0.000 description 40
- 230000005540 biological transmission Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
The utility model provides a free-space polarization dependence type optoisolator which comprises a 45-degree Faraday rotator, an incidence polarizing film and an emergence polarizing film. The 45-degree Faraday rotator is distributed along the optical axis, the incidence polarizing film is prepared on the incident plane of the Faraday rotator, the emergence polarizing film is prepared on the emergent plane of the Faraday rotator, the polarizing directions of the incidence polarizing film and the emergence polarizing film are perpendicular to the Z axis and are parallel after rotation around the Z axis, and the incidence polarizing film and the emergence polarizing film are composed of a series of birefringence layers which have the same refractive index to the polarized light along the x- direction and have alternate high and low refractive indexes to the polarized light along the y- direction. The free-space polarization dependence type optoisolator is low in cost, small in size and integrated.
Description
[technical field]
The utility model relates to a kind of optical field, refers in particular to a kind of free space polarization sensitive photocoupler.
[background technology]
Optoisolator is in optical communication and the widespread use of industrial lasers application, it is a kind of optical passive component of nonreciprocal transmission light, be used for allowing the forward transmission light normally by this product, and be coupled in the output waveguide, stop simultaneously reverse transfer to couple light in the input waveguide, cause the optical system job insecurity.Optoisolator is divided in line style and free space type two large classes by the environment of its use, can be divided into polarization relationship type and polarization independent type by its polarization characteristic.The relevant isolator of the polarization of general free space type is used some more, mainly is used in the encapsulation of active device.
At present, a large amount of commercial free space isolators adopt two polaroids and 45 ° of Faraday polarization apparatus of a slice to form, and 45 ° of Faraday polarization apparatus are placed between two polaroids, and the polarization direction of two polaroids differs 45 °.When light positive to when transmission, incident light passes through polaroid with the parallel part in first polaroid polarization direction, the part vertical with the polarization direction is polarized sheet and absorbs, light by polaroid enters behind the Faraday polarization apparatus under the Faraday effect effect 45 ° of rotations, just in time parallel with the polarization direction of second polaroid, therefore can pass through second polaroid losslessly.When the light reverse transfer, the part vertical with second polaroid polarization direction directly is polarized sheet and absorbs, and the part parallel with the polarization direction is lossless to be seen through, and then enters Faraday polarization apparatus; Because the sense of rotation of Faraday polarization apparatus only is decided by magnetic direction, can not change along with the incident direction of light, therefore continue 45 ° of arrival of direction rotation the first polaroid the same when transmit along forward, this moment, the polarisation of light attitude was vertical with the polarization direction of the first polaroid, light is absorbed by the first polaroid, can not project in the input waveguide.But the free space isolator volume of this structure is large and cost is higher.
Dielectric film with structural birefringence (form birefringence) characteristic can prepare by vacuum.Simultaneously, by the growth conditions of seriation ground control film, such as degree of tilt and the anglec of rotation etc. of periodic variation substrate in vacuum chamber, can obtain a birefringent film series.For vertical incidence light, birefringent film has same refractive index to the light along one party to polarization in this series, and to the meet at right angles light of polarization of this direction high low-refraction interval being arranged.Therefore, thickness and birefraction thereof by each rete in the control series thin film can make along the polarized light that the incident of same refractive index direction is arranged and see through this series thin film, along there being the polarized light of high low-refraction direction incident then to be reflected by this series thin film.For example, referring to " Serial bideposition of anisotropic thin films with enhanced linear birefringence " such as Hodgkinson, Applied Optics, 38,3621 (1999) (" having the serial secondary preparation method who strengthens the linear birefringence effect anisotropic films ", applied optics, 38,3621 (1999)).
[utility model content]
The technical problems to be solved in the utility model is to provide a kind of performance index higher, and cost hangs down the integrated-type free space polarization sensitive photocoupler device with small volume.
The utility model is achieved in that a kind of free space polarization sensitive photocoupler, it comprises 45 ° of Faraday rotators of a slice, incident polarization film and outgoing polarization film, described 45 ° of Faraday rotators distribute along optical axis, described incident polarization film preparation is in this Faraday rotator plane of incidence, the outgoing polarization film is prepared in the exit facet of this Faraday rotator, the polarization direction of described incident polarization film and outgoing polarization film is perpendicular to Z axis, and the polarization direction of described incident polarization film and outgoing polarization film around Z axis rotate 45 ° parallel.Wherein, described incident polarization film and outgoing polarization film are by a series of polarized light along the x-direction to be had same refractive index, and the polarized light along the y-direction is the rete composition at high low-refraction interval.
The utility model has the advantage of: but the utility model free space polarization sensitive photocoupler uses the plane polarization film of one time to produce to replace polaroid as polarizing component, to realize the purpose of the return light of isolation.In the utility model free space polarization sensitive photocoupler, polarization film directly is prepared on the Faraday rotator, becomes an integrated optics body, has not only reduced cost, has also reduced the volume of optoisolator.
[description of drawings]
In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.
Fig. 1 be the utility model incident polarization film and outgoing polarization film along x-direction light with along the synoptic diagram of y-direction light transmission rate.
Fig. 2 is the structural representation of the utility model free space polarization sensitive photocoupler, and shows forward entrance polarisation of light attitude.
Fig. 3 is the structural representation of the utility model free space polarization sensitive photocoupler, and shows the polarization state of reverse incident light.
[embodiment]
See also Fig. 1 to shown in Figure 3, the utility model free space polarization sensitive photocoupler comprises 45 ° of Faraday rotators 1 of a slice, incident polarization film 2 and outgoing polarization film 3, described 45 ° of Faraday rotators 1 distribute along Z axis, described incident polarization film 2 is prepared in this Faraday rotator 1 plane of incidence, outgoing polarization film 3 is prepared in the exit facet of this Faraday rotator 1, the polarization direction of described incident polarization film 2 and outgoing polarization film 3 is perpendicular to Z axis, and the polarization direction of described incident polarization film 2 and outgoing polarization film 3 around Z axis rotate 45 ° parallel.
Wherein, described incident polarization film 2 and outgoing polarization film 3 are by a series of polarized light along the x-direction to be had same refractive index, and the polarized light along the y-direction is the rete composition at high low-refraction interval.So that the fairing of x-direction is sharp by this rete, y-direction light then can be reflected out rete during by this rete.
Now analyze principle of work of the present utility model:
Based on general optical principle, light beam incident is the high refractive index layer of λ/4 and film that low-index layer alternately builds up system by nh, and this film system can symbolically be
GHLHLH…LHA=G(HL)
pHA p=1,2,3，...
In the formula, G and A are respectively substrate and air, and H and L are respectively the high and low refractive index layer, and 2p+1 is the rete number.Following formula is the reflectance formula of light when normal incidence:
In the formula, n
HAnd n
LBe respectively the refractive index of high and low refractive index layer, n
GRefractive index for substrate.As shown from the above formula, high low-refraction differs larger, and it is more that rete is counted 2p+1, and the reflectance of film system is just higher.
As shown in Figure 1, in the employed rete of the utility model free space polarization sensitive photocoupler, suppose one with the rete series that is made of 21 layers of birefringent film of silicon preparation, its refractive index is n in the x-direction
x=2.15, its refractive index is respectively n for two adjacent film layers in the y-direction
Y1=2.40 and n
X2=1.90, near 1550nm along the light transmission rate of x-direction polarization near 100%, and along the light transmission rate of y-direction polarization near 0, namely the light along y-direction polarization is reflected rete fully.
As shown in Figure 2, in the utility model free space polarization sensitive photocoupler, when natural light during from forward entrance, the polarization direction will be reflected perpendicular to the light (being y-direction light) of the polarization direction of incident polarization film 2, the polarization direction light (be x-direction light) consistent with the polarization direction of incident polarization film 2 can pass through incident polarization film 2, polarized light rotates 45 ° through 45 ° of Faraday rotators, 1 rear polarizer direction around the z axle, this moment polarisation of light direction parallel with the polarization direction of outgoing polarization film 3 (being x-direction light), so light can pass through.Its light from the polarization state of forward entrance as shown in the dotted line frame of Fig. 2 the latter half.
As shown in Figure 3, in the utility model free space polarization sensitive photocoupler, when natural light during from reverse incident, x-direction light transmission incident polarization film 3, again through 45 ° of Faraday rotators, 1 rear polarizer direction rotation 45 °, this moment polarisation of light direction and incident polarization film 2 mutual vertical being reflected out in polarization direction, do not have light to pass through, thereby reach the effect of reverse isolation, its light from the polarization state of reverse incident as shown in the dotted line frame of Fig. 3 the latter half.
Although more than described embodiment of the present utility model; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present utility model; those of ordinary skill in the art are in modification and the variation of the equivalence of doing according to spirit of the present utility model, all should be encompassed in the scope that claim of the present utility model protects.
Claims (1)
1. free space polarization sensitive photocoupler, it is characterized in that: comprise 45 ° of Faraday rotators of a slice, the incident polarization film of planar film structure and outgoing polarization film, described 45 ° of Faraday rotators distribute along optical axis, described incident polarization film preparation is in this Faraday rotator plane of incidence, the outgoing polarization film is prepared in the exit facet of this Faraday rotator, the polarization direction of described incident polarization film and outgoing polarization film is perpendicular to Z axis, and the polarization direction of described incident polarization film and outgoing polarization film around Z axis rotate 45 ° parallel, described incident polarization film and outgoing polarization film are by a series of polarized light along the x-direction to be had same refractive index, and the polarized light along the y-direction is the birefringence rete composition at high low-refraction interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215461 CN202649637U (en) | 2012-05-14 | 2012-05-14 | Free-space polarization dependence type optoisolator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215461 CN202649637U (en) | 2012-05-14 | 2012-05-14 | Free-space polarization dependence type optoisolator |
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| Publication Number | Publication Date |
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| CN202649637U true CN202649637U (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220215461 Expired - Lifetime CN202649637U (en) | 2012-05-14 | 2012-05-14 | Free-space polarization dependence type optoisolator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104656287A (en) * | 2015-03-11 | 2015-05-27 | 宋博 | Ultrathin optical isolator and manufacturing method thereof |
| CN109725378A (en) * | 2018-02-13 | 2019-05-07 | 华为技术有限公司 | Protective film, the method and apparatus for cutting protective film |
| CN110531529A (en) * | 2019-09-29 | 2019-12-03 | 平行现实（杭州）科技有限公司 | A kind of optical texture of Unidirectional transparent |
-
2012
- 2012-05-14 CN CN 201220215461 patent/CN202649637U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104656287A (en) * | 2015-03-11 | 2015-05-27 | 宋博 | Ultrathin optical isolator and manufacturing method thereof |
| CN109725378A (en) * | 2018-02-13 | 2019-05-07 | 华为技术有限公司 | Protective film, the method and apparatus for cutting protective film |
| CN110531529A (en) * | 2019-09-29 | 2019-12-03 | 平行现实（杭州）科技有限公司 | A kind of optical texture of Unidirectional transparent |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130102 |