CN102944918A - Faraday rotation mirror structure - Google Patents
Faraday rotation mirror structure Download PDFInfo
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- CN102944918A CN102944918A CN2012104473486A CN201210447348A CN102944918A CN 102944918 A CN102944918 A CN 102944918A CN 2012104473486 A CN2012104473486 A CN 2012104473486A CN 201210447348 A CN201210447348 A CN 201210447348A CN 102944918 A CN102944918 A CN 102944918A
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Abstract
The invention discloses a faraday rotation mirror structure, which comprises an optical fiber, a collimating lens, a faraday rotation device, a reflective lens and a magnetic ring, wherein the optical fiber, the collimating lens, the faraday rotation device, the reflective lens and the magnetic ring are arranged coaxially, the end surface of the optical fiber is arranged at the focus of the collimating lens, the rear focal surface of the collimating lens is coincident with the front focal surface of the reflective lens, the rear end surface of the reflective lens is plated with a high-reflection membrane, a reflective surface is arranged at the rear focal surface of the reflective lens, the magnetic ring is sleeved at the outer part of the faraday rotation device, can generate a fixed electromagnetic field after the two ends of the magnetic ring are powered on, the optical fiber is used for receiving the light from the outer part, the light can be emitted to the inclined surface of the collimating lens through the end face, the collimating lens is used for collimating the light from the optical fiber, and the faraday rotation device is used for realizing that the parallel light from the collimating lens can deflect in a light polarization state under the action of the electromagnetic field generated by the magnetic ring. The faraday rotation mirror structure disclosed by the invention can avoid the debugging on a reflective light path, and is directly and mechanically assembled.
Description
Technical field
The invention belongs to sensory field of optic fibre, more specifically, relate to a kind of faraday rotation mirror structure.
Background technology
In recent years, sensor is towards sensitivity, and is accurate, strong adaptability, small and exquisite and intelligentized future development.In this course, Fibre Optical Sensor gains great popularity.Fibre Optical Sensor mainly is comprised of optical fiber and photo-detector.Its basic functional principle is with the light process optical fiber from light source, in transmission course, is subject to external disturbance (such as vibration, pressure, temperature, electric field, magnetic field or acoustic vibration etc.), cause light optical property (such as intensity, wavelength, frequency, phase place, polarization state etc.) change, be called modulated flashlight, these modulated flashlights are admitted to photo-detector, after demodulation, obtain measured parameter.Yet birefringent phenomenon very likely occurs when propagating in light signal in single-mode fiber, cause the change of light signal polarization state, causes error.For avoiding the problems referred to above, introduce faraday rotation mirror, eliminate the variation of the polarization state that light signal causes because of birefringence, keep the light signal polarization state constant.
Fig. 1 is the faraday rotation mirror structural section view of available technology adopting, and this faraday rotation mirror 11 comprises optical fiber 12, C-Lens 13, Faraday rotator 14, catoptron 15 and magnet 16.Optical fiber 12 is single-mode fibers, fiber end face (is generally oblique 8 °, increase return loss) be positioned at the focus place of C-Lens 13, flashlight is from optical fiber 12 inputs, be converted to parallel rays by C-Lens 13 collimations, this parallel rays departs from primary optical axis and certain deflection angle is arranged, through behind the Faraday rotator 14, under the magnetic field of determining, the polarized state of light ψ that rotates to an angle impinges perpendicularly on catoptron 15, and reflected light returns by former road and again passes through Faraday rotator 14, C-Lens 13, from optical fiber 12 outputs, this moment, polarized state of light rotated 2 ψ.But therefore use the deviation of polarization state in the faraday rotation mirror 11 compensated optical fiber sensor-based systems, thereby realize system stability work.Based on above-mentioned principle of work, need to guarantee that the minute surface of catoptron is mutually vertical with the parallel rays of collimation, need accurate optics debugging, so greatly increase the complexity of manufacture craft, thereby needed long installation time.
Summary of the invention
For the defective of prior art, the object of the present invention is to provide a kind of faraday rotation mirror structure, can remove the debugging of reflected light path from, directly carry out the machinery assembling.
For achieving the above object, the invention provides a kind of faraday rotation mirror structure, the optical fiber that comprises coaxial setting, collimation lens, Faraday rotator, reflective lens and magnet ring, the end face of optical fiber is arranged at the focus place of collimation lens, the back focal plane of collimation lens and the front focal plane of reflective lens overlap, the rear end face of reflective lens is coated with highly reflecting films, and reflecting surface is arranged at the back focal plane of reflective lens, magnet ring is the outside that is sheathed on Faraday rotator, and can after the energising of two ends, produce changeless electromagnetic field, optical fiber is used for receiving the light from the outside, and be transmitted into by its end face on the inclined-plane of light collimation lens, collimation lens is used for the light from optical fiber is collimated, and the parallel rays after will collimating is transmitted into Faraday rotator, Faraday rotator is used for making the parallel rays of self-focus lens to realize light polarization state deflection angle ψ under the electromagnetic field effect that magnet ring produces, and with the light emission after the polarization state deflection to reflective lens, reflective lens is used for and will turns back to Faraday rotator from the former road of the light of Faraday rotator, Faraday rotator also is used for making the light from reflective lens to realize again deflection angle ψ of light polarization state under the electromagnetic field effect that magnet ring produces, and with the light emission behind the polarization state polarization to collimation lens, on the back focal plane of collimation lens, height r and the angle θ of the parallel rays behind the collimation lens collimation are as follows:
Wherein α is the angle of optical fiber and vertical axis,
Be the angle of collimation lens and vertical axis, n
fBe the fiber core refractive index of optical fiber, n
cBe the refractive index of collimation lens, f be collimation lens focal length and
Wherein R is the spherical radius of the rear end face of collimation lens, and reflective lens receives that to turn back to the relation of light of Faraday rotator from the light of Faraday rotator and reflective lens as follows:
r
2＝-r
1
θ
2＝-θ
1
R wherein
1And θ
1Respectively height and the angle of the light of reflective lens front focal plane place's incident, r
2And θ
2Respectively height and the angle that reflects back into the light at reflective lens front focal plane place.
Collimation lens is the C-Lens lens.
Reflective lens is the C-Lens lens of rear end face plating highly reflecting films.
Collimation lens also is used for will be from the former road emission of the light of Faraday rotator back into optical fibers, and optical fiber also is used for the light emission of self-focus lens in future to outside.
The above technical scheme of conceiving by the present invention, compared with prior art, the present invention has following beneficial effect: faraday rotation mirror structure of the present invention is by arranging the angle of fiber end face and collimation lens end face, the parallel rays that guarantees collimation is coaxial with collimation lens, use the reflective lens replacement catoptron that rear end face is coated with highly reflecting films instead, parallel rays is injected from the reflective lens optical axis, original optical path returns, can remove the debugging of reflected light path from, directly carry out the machinery assembling, thereby improve the efficiency of assembling of device, more be fit to batch production, can be widely used in optical fiber communication and the optical fiber sensing system.
Description of drawings
Fig. 1 is the cross sectional view of faraday rotation mirror structure of the prior art.
Fig. 2 is the cross sectional view of faraday rotation mirror structure of the present invention.
Fig. 3 is the synoptic diagram that light passes through light polarization state variation behind each element of faraday rotation mirror.
Fig. 4 is the light path synoptic diagram of collimation lens among the present invention.
Fig. 5 is the light path synoptic diagram of reflective lens among the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, faraday rotation mirror structure of the present invention comprises optical fiber 111, collimation lens 112, Faraday rotator 113, reflective lens 114 and the magnet ring 115 of coaxial setting.
The end face of optical fiber 111 is arranged at the focus place of collimation lens 112.
The front focal plane of the back focal plane of collimation lens 112 and reflective lens 114 overlaps.
The rear end face of reflective lens 114 is coated with highly reflecting films, and reflecting surface is arranged at the back focal plane of this reflective lens 114.In the present embodiment, collimation lens 112 is the C-Lens lens, and reflective lens 114 is the C-Lens lens of rear end face plating highly reflecting films.
Optical fiber 111 is used for receiving the light from the outside, and is transmitted into by its end face on the inclined-plane of light collimation lens 112.
Faraday rotator 113 is used for making the parallel rays of self-focus lens 112 to realize light polarization state deflection angle ψ (be take 45 ° as example in diagram) under the electromagnetic field effect that magnet ring 115 produces, and with the light emission after the polarization state deflection to reflective lens 114.
Faraday rotator 113 also is used for making the light from reflective lens 114 to realize again deflection angle ψ of polarization state under the electromagnetic field effect that magnet ring 115 produces, and the light emission behind the polarization state polarization is arrived collimation lens 112.Because the optical direction of Faraday effect is decided by the externally-applied magnetic field direction, irrelevant with the direction of propagation of light, this moment, polarized state of light rotated 2 ψ (namely being 90 ° in this example)
Optical fiber 111 also is used in the future, and the light emission of self-focus lens 112 arrives outside.
Structure of the present invention has guaranteed that the parallel rays of collimation is coaxial with collimation lens, has removed the debugging of reflected light path from, realizes the direct mechanical assembling.The change of light by each element rear polarizer state of faraday rotation mirror of the present invention it should be noted that with reference to figure 3 arrow only represents the lightray propagation direction among this figure.
As shown in Figure 4, on the back focal plane of collimation lens, height r and the angle θ of the parallel rays behind the collimation are as follows:
Wherein α is the angle of optical fiber and vertical axis,
Be the angle of collimation lens and vertical axis, n
fBe the fiber core refractive index of optical fiber, n
cBe the refractive index of collimation lens, f be collimation lens focal length and
Wherein R is the spherical radius of the rear end face of collimation lens.
Can see from following formula, when α and angle
Satisfy
Can with the eliminating from axle of collimated ray, guarantee that the parallel rays of collimation is coaxial with collimation lens.
In the present embodiment, the material of collimation lens is the SF11 shaped material, and its refractive index is n
c=1.7447, optical fiber adopts SMF-28 type optical fiber, and its fiber core refractive index is n
f=1.4682, the optical fiber head angle of optical fiber is 8 ° usually, then can obtain angle by following formula
Be 5 °, can not affect like this return loss of collimating apparatus, and guarantee that the parallel rays of collimation is coaxial with collimation lens, and the light drift angle also reduces a lot.
As shown in Figure 5, light is from the front focal plane incident of reflective lens, and the plane of reflection is positioned at back focal plane, i.e. 2f system, and the transmission matrix that calculates reflective lens according to optical matrix is:
According to above-mentioned transmission matrix, the relation of reflection ray and incident ray (particularly, the light that reflective lens receives from Faraday rotator is incident ray, and the light that reflective lens turns back to Faraday rotator is reflection ray) is as follows:
r
2＝-r
1
θ
2＝-θ
1
R wherein
1And θ
1Respectively height and the angle of the light of reflective lens front focal plane place's incident, r
2And θ
2Respectively height and the angle that reflects back into the light at reflective lens front focal plane place.
Can illustrate that from following formula reflected light is inevitable parallel with incident light, if light is incident on the lens axis, then reflection ray will overlap fully with incident ray, and therefore fully not light requirement road debugging is directly carried out the machinery assembling and got final product.
On the basis of above-mentioned theory knowledge, the faraday rotation mirror structure that the present invention proposes, suitably design the angle of fiber end face and collimation lens end face, can guarantee that the parallel rays that collimates is coaxial with collimation lens, use the reflective lens replacement catoptron that rear end face is coated with highly reflecting films instead, parallel rays is injected from the reflective lens optical axis, no matter and how incident angle changes, but reflection ray all original optical path returns, and can remove the debugging of reflected light path from, directly carries out the machinery assembling.
Those skilled in the art will readily understand; the above only is preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a faraday rotation mirror structure is characterized in that,
The optical fiber, collimation lens, Faraday rotator, reflective lens and the magnet ring that comprise coaxial setting;
The end face of described optical fiber is arranged at the focus place of described collimation lens;
The back focal plane of described collimation lens and the front focal plane of described reflective lens overlap;
The rear end face of described reflective lens is coated with highly reflecting films, and described reflecting surface is arranged at the back focal plane of described reflective lens;
Described magnet ring is the outside that is sheathed on described Faraday rotator, and can produce changeless electromagnetic field after the energising of two ends;
Described optical fiber is used for receiving the light from the outside, and is transmitted into by its end face on the inclined-plane of described light collimation lens;
Described collimation lens is used for the light from optical fiber is collimated, and the parallel rays after will collimating is transmitted into Faraday rotator;
Faraday rotator is used for making from the parallel rays of described collimation lens realizes light polarization state deflection angle ψ under the electromagnetic field effect that described magnet ring produces, and the light emission after the polarization state deflection is arrived described reflective lens;
Described reflective lens is used for and will turns back to described Faraday rotator from the former road of the light of described Faraday rotator;
Described Faraday rotator also is used for making the light from described reflective lens to realize again deflection angle ψ of polarization state under the electromagnetic field effect that described magnet ring produces, and the light emission behind the polarization state polarization is arrived described collimation lens;
Height r and the angle θ of the parallel rays behind the described collimation lens collimation are as follows:
Wherein α is the angle of described optical fiber and vertical axis,
Be the angle of described collimation lens and vertical axis, n
fBe the fiber core refractive index of described optical fiber, n
cBe the refractive index of described collimation lens, f be collimation lens focal length and
Wherein R is the spherical radius of the rear end face of described collimation lens;
Described reflective lens receives that to turn back to the relation of light of described Faraday rotator from the light of described Faraday rotator and described reflective lens as follows:
r
2＝-r
1
θ
2＝-θ
1
R wherein
1And θ
1Respectively height and the angle of the light of described reflective lens front focal plane place's incident, r
2And θ
2Respectively height and the angle that reflects back into the light at described reflective lens front focal plane place.
2. faraday rotation mirror structure according to claim 1 is characterized in that, described collimation lens is the C-Lens lens.
3. faraday rotation mirror structure according to claim 1 is characterized in that, described reflective lens is the C-Lens lens of rear end face plating highly reflecting films.
4. faraday rotation mirror structure according to claim 1 is characterized in that,
Described collimation lens also is used for and will launches back described optical fiber from the former road of the light of described Faraday rotator;
Described optical fiber also is used for arriving from the light emission of described collimation lens outside.
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| CN 201210447348 CN102944918B (en) | 2012-11-10 | 2012-11-10 | Faraday rotation mirror structure |
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| CN 201210447348 CN102944918B (en) | 2012-11-10 | 2012-11-10 | Faraday rotation mirror structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412371A (en) * | 2013-07-29 | 2013-11-27 | 华中科技大学 | Faraday rotary mirror capable of simultaneously carrying out polarization state conversion on multiple paths of optical signals |
| CN106646928A (en) * | 2016-10-28 | 2017-05-10 | 京东方科技集团股份有限公司 | Anti-dazzling device and control method thereof |
| CN106707414A (en) * | 2016-12-26 | 2017-05-24 | 上海伟钊光学科技股份有限公司 | Optical fiber isolator |
| CN106772916A (en) * | 2016-12-14 | 2017-05-31 | 上海伟钊光学科技股份有限公司 | Miniature Faraday speculum |
| CN106940387A (en) * | 2017-04-10 | 2017-07-11 | 三峡大学 | A kind of Michelson interference formula optical fiber acceleration transducer |
| CN107121876A (en) * | 2017-05-26 | 2017-09-01 | 中国科学院西安光学精密机械研究所 | Folding axial lens system capable of being positioned |
| CN107193137A (en) * | 2017-07-24 | 2017-09-22 | 上海伟钊光学科技股份有限公司 | A kind of fibre optic isolater |
| CN111830646A (en) * | 2020-05-12 | 2020-10-27 | 上海交通大学 | Optical fiber coupling packaging structure, coupling packaging method and coupling array |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412371A (en) * | 2013-07-29 | 2013-11-27 | 华中科技大学 | Faraday rotary mirror capable of simultaneously carrying out polarization state conversion on multiple paths of optical signals |
| CN103412371B (en) * | 2013-07-29 | 2015-07-22 | 华中科技大学 | Faraday rotary mirror capable of simultaneously carrying out polarization state conversion on multiple paths of optical signals |
| CN106646928A (en) * | 2016-10-28 | 2017-05-10 | 京东方科技集团股份有限公司 | Anti-dazzling device and control method thereof |
| CN106772916A (en) * | 2016-12-14 | 2017-05-31 | 上海伟钊光学科技股份有限公司 | Miniature Faraday speculum |
| CN106707414A (en) * | 2016-12-26 | 2017-05-24 | 上海伟钊光学科技股份有限公司 | Optical fiber isolator |
| CN106707414B (en) * | 2016-12-26 | 2024-01-19 | 上海毫米星光光学有限公司 | Optical fiber isolator |
| CN106940387A (en) * | 2017-04-10 | 2017-07-11 | 三峡大学 | A kind of Michelson interference formula optical fiber acceleration transducer |
| CN106940387B (en) * | 2017-04-10 | 2023-10-27 | 三峡大学 | Michelson interference type optical fiber acceleration sensor |
| CN107121876A (en) * | 2017-05-26 | 2017-09-01 | 中国科学院西安光学精密机械研究所 | Folding axial lens system capable of being positioned |
| CN107121876B (en) * | 2017-05-26 | 2022-08-19 | 中国科学院西安光学精密机械研究所 | Folding-axis mirror system capable of being positioned |
| CN107193137A (en) * | 2017-07-24 | 2017-09-22 | 上海伟钊光学科技股份有限公司 | A kind of fibre optic isolater |
| CN111830646A (en) * | 2020-05-12 | 2020-10-27 | 上海交通大学 | Optical fiber coupling packaging structure, coupling packaging method and coupling array |
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| CN102944918B (en) | 2013-12-25 |
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