CN101334506A - Optical isolator - Google Patents
Optical isolator Download PDFInfo
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- CN101334506A CN101334506A CNA2007100181914A CN200710018191A CN101334506A CN 101334506 A CN101334506 A CN 101334506A CN A2007100181914 A CNA2007100181914 A CN A2007100181914A CN 200710018191 A CN200710018191 A CN 200710018191A CN 101334506 A CN101334506 A CN 101334506A
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- optical fiber
- fiber head
- grin lens
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- inner face
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Abstract
The invention provides an optical separator, consisting of an inlet optical fibre head, a separation body, two self-focus lenses and an outlet optical fibre head which are sequentially arranged; the separation body consists of a displacement-typed crystal, 45DEG Faraday rotary plate, a half-wave plate and a displacement-typed crystal which are sequentially arranged and fixedly connected with each other; the separated surfaces of the two displacement-typed crystals are parallel to each other, with the same separation quantity and reverse separation directions. The facing surfaces of the inlet optical fibre head and the first self-focus lens are parallel to each other and the facing surfaces of the outlet optical fibre head and the second self-focus lens are parallel to each other; the optical axes of the two self-focus lenses are parallel to each other, with the same focal length and coincident adjacent focal surfaces; the internal end surface of the inlet optical fibre head and the internal end surface of the outlet optical fibre head are arranged at an object/image conjugation position. The optical separator solves the technical problems of large volume and high cost in the background technique, and has the advantages of good separation effect and eliminating the polarization mode dispersion.
Description
Technical field
The present invention relates to a kind of optoisolator that is applied to fiber optic communication field.
Background technology
Optoisolator is an a kind of optical passive component that allows the light one-way transmission, is used to protect luminescent devices such as laser instrument, image intensifer, makes it not to be subjected to the interference of Hui Xiangguang.Optoisolator is divided into two kinds by the correlativity of polarization: polarization relationship type and polarization independent type.Since in the optical fiber communication in the optical fiber polarization state of light wave be stochastic transformation, therefore, often adopt polarization independent optical isolator.
The implementation of polarization independent optical isolator has multiple, wherein mainly contains two types: displacement (Displacer) type optoisolator and wedge type optoisolator.These two types at document " polarization independent optical isolator ", photoelectron association, and 1979/7 Vol.J.62-CNo.7 has detailed introduction among pp.505-512 and the United States Patent (USP) U.S.Pat.No.4548478.The optoisolator of such traditional structure, when light sends through after the GRIN Lens coupling through optical fiber head, radius at lens output terminal light beam is 0.5mm, like this, if isolated body partly is placed between two GRIN Lens, must make reverse o light and e light separately very big distance just can get the effect of isolation, this just requires, and the size of used displacement type crystal and faraday's revolving fragment or wedge type birefringece crystal is very big just to reach requirement, causes the volume of device big, cost is high.For example: the displacement type optoisolator, in order to satisfy insulated degree requirement, make backlight with respect to input collimating apparatus generation transversal displacement, two-beam in the reverse optical path need be offset big distance, this just requires the volume of displacement crystal very big, thereby cause the optoisolator overall volume big, and with high costs, replaced by the wedge type optoisolator.The wedge type optoisolator, make backlight with respect to input collimating apparatus generation angle deviating, isolation effect is good than the displacement type optoisolator, but there are deficiencies such as polarization mode dispersion and parallel displacement in it, need compensate, and the cross section of used wedge type birefringece crystal and faraday's revolving fragment is excessive, and cost is also higher.
Summary of the invention
The object of the present invention is to provide a kind of optoisolator, it has solved the technical matters that volume is big in the background technology, cost is high.
Technical solution of the present invention is as follows:
A kind of optoisolator, comprise: isolated body 2, be divided into going into to hold optical fiber head 1 and going out to hold optical fiber head 5 of housing 7 two ends, be arranged at end optical fiber head 1 and go out to hold first GRIN Lens 3, second GRIN Lens 4 between the optical fiber head 5, describedly go into to hold optical fiber head 1, first GRIN Lens 3, second GRIN Lens 4 to be fixed in the glass bushing 6; It is characterized in that: described isolated body 2 is fixed with one by the displacement type crystal 2 that sets gradually 01,45 ° of faraday's revolving fragments 202, half-wave plate 203 and displacement type crystal 2s 04 and constitutes, optical axis included angle between the described first displacement type crystal 2 01 and the second displacement type crystal 2 04 is 90 °, the described first displacement type crystal 2 01 and the second displacement type crystal 2 04 walk from plane parallel, walk identical and walk from direction opposite from amount; Described isolated body 2 is arranged between the end optical fiber head 1 and first GRIN Lens 3 and by the second displacement type crystal 2 04 and first GRIN Lens 3 and fixes; The described inner face of going into to hold optical fiber head 1 parallels with in opposite directions the end face of first GRIN Lens 3 with it, the described inner face that goes out to hold optical fiber head 5 parallels with in opposite directions the end face of second GRIN Lens 4 with it, described first GRIN Lens 3 and second GRIN Lens 4 end face in opposite directions are perpendicular to central shaft OO ', described first GRIN Lens 3 is parallel with the optical axis of second GRIN Lens 4, focal length is identical and adjacent focal plane overlaps, the described inner face of going into to hold optical fiber head 1 with go out to hold the inner face of optical fiber head 5 to be on the object-image conjugate position.
Optical axis included angle between the above-mentioned half-wave plate 203 and the first displacement type crystal 2 01 generally should be 22.5 °.
The above-mentioned inner face of going into to hold optical fiber head 1 can be perpendicular to the plane of central shaft OO ', or has the inclined-plane of 90 °-α angle with central shaft OO '; The above-mentioned inner face that goes out to hold optical fiber head 5 can be perpendicular to the plane of central shaft OO ' or for having the inclined-plane of 90 °-α angle with central shaft OO ', the value of described α is 6 °～10 °.
The above-mentioned inner face of going into to hold optical fiber head 1 is good with going out to hold the inner face of optical fiber head 5 all to be coated with anti-reflection film, and above-mentioned first GRIN Lens 3 and second GRIN Lens 4 end face in opposite directions are good to be coated with anti-reflection film also.
Above-mentioned 45 ° of faraday's revolving fragments 202 can adopt the magnetic revolving fragment, also can adopt the non magnetic revolving fragment of peripheral hardware permanent magnetism ring.
90 °-α the angle of the above-mentioned inner face of going into to hold optical fiber head 1 and central shaft OO ' and describedly go out to hold the inner face of optical fiber head 5 and the 90 °-α angle of central shaft OO ', the value of this α is good with 8 °.
The present invention has the following advantages:
The present invention is positioned over isolated body between optical fiber head and the GRIN Lens, the displacement type crystal that then selectable size is very little and faraday's revolving fragment.Because, the spot size w of the light that sends in the optical fiber
0≈ 5um can be approximated to be pointolite, and forward light can pass through isolated body fully, and reverse o light and e light only need separate very little distance and promptly can not be coupled in the optical fiber, so have good isolation effect.
The present invention can adopt the very little displacement type crystal of volume and faraday's revolving fragment, and product is realized microminiaturized, to adapt to the microminiaturized requirement of Fibre Optical Communication Technology develop rapidly to optoisolator.
Cost of the present invention descends significantly, and can eliminate polarization mode dispersion.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The drawing reference numeral explanation:
1-goes into to hold optical fiber head; The 2-isolated body; The 201-first displacement type crystal; 202-45 ° of faraday's revolving fragment; The 203-half-wave plate; The 204-second displacement type crystal; 3-first GRIN Lens; 4-second GRIN Lens; 5-goes out to hold optical fiber head; The 6-glass bushing, the 7-housing.
Embodiment
Referring to Fig. 1, one end of housing 7 of the present invention is for going into to hold optical fiber head 1, the other end is for going out to hold optical fiber head 5, go into to hold optical fiber head 1 and go out to hold to be followed successively by between the optical fiber head 5 isolated body 2, first GRIN Lens 3 and second GRIN Lens 4, wherein go into to hold optical fiber head 1, isolated body 2, first GRIN Lens 3, second GRIN Lens 4 to be fixed in the glass bushing 6.
Isolated body 2 is fixed with one by the displacement type crystal 2 that sets gradually 01,45 ° of faraday's revolving fragments 202, half-wave plate 203 and displacement type crystal 2s 04 and constitutes, optical axis included angle between the first displacement type crystal 2 01 and the second displacement type crystal 2 04 is 90 °, the first displacement type crystal 2 01 and the second displacement type crystal 2 04 walk from plane parallel, walk identical and walk from direction opposite from amount.Optical axis included angle between 4 half-wave plates 203 and the first displacement type crystal 2 01 is 22.5 °.45 ° of faraday's revolving fragments 202 are the magnetic revolving fragment, or the non magnetic revolving fragment of peripheral hardware permanent magnetism ring.Isolated body 2 fixes by the second displacement type crystal 2 04 and first GRIN Lens 3.
The inner face of going into to hold optical fiber head 1 parallels with in opposite directions the end face of first GRIN Lens 3 with it, the inner face that goes out to hold optical fiber head 5 parallels with in opposite directions the end face of second GRIN Lens 4 with it, first GRIN Lens 3 and second GRIN Lens 4 end face in opposite directions are perpendicular to central shaft OO ', first GRIN Lens 3 is parallel with the optical axis of second GRIN Lens 4, focal length is identical and adjacent focal plane overlaps, and goes into to hold the inner face of optical fiber head 1 and goes out to hold the inner face of optical fiber head 5 to be on the object-image conjugate position.Go into to hold the inner face of optical fiber head 1 can be perpendicular to the plane of central shaft OO ' or have the inclined-plane of 90 °-α angle, go out to hold the inner face of optical fiber head 5 can be perpendicular to the plane of central shaft OO ' or for having the inclined-plane of 90 °-α angle with central shaft OO ' with central shaft OO '.The value of α in 6 °～10 ° scopes, is good with 8 ° generally.In opposite directions end face of first GRIN Lens 3 and second GRIN Lens 4, going into to hold the inner face of optical fiber head 1 and go out to hold the inner face of optical fiber head 5, is good to be coated with anti-reflection film all.
During work, pointolite is by going into to hold optical fiber head 1 to enter, and entering first GRIN Lens 3 by isolated body 2 becomes directional light, pools pointolite through second GRIN Lens 4 again, by going out to hold optical fiber head 5 to penetrate.By the pointolite that goes out to hold optical fiber head 5 to return, become directional light through second GRIN Lens 4, pool pointolite through first GRIN Lens 3 again, o light and e light are separated a bigger angle during through isolated body 2, can not be coupled into, thereby reach the purpose that light is isolated into end optical fiber head 1.
Claims (6)
1. optoisolator, comprise isolated body (2), be divided into going into to hold optical fiber head (1) and going out to hold optical fiber head (5) of housing (7) two ends, be arranged at end optical fiber head (1) and go out to hold first GRIN Lens (3), second GRIN Lens (4) between the optical fiber head (5), describedly go into to hold optical fiber head (1), first GRIN Lens (3), second GRIN Lens (4) to be fixed in the glass bushing (6); It is characterized in that: described isolated body (2) is by the displacement type crystal (201) that sets gradually, 45 ° of faraday's revolving fragments (202), half-wave plate (203) and displacement type crystal (204) formation that is fixed with one, optical axis included angle between the described first displacement type crystal (201) and the second displacement type crystal (204) is 90 °, the described first displacement type crystal (201) and the second displacement type crystal (204) walk from plane parallel, walk identical and walk from direction opposite from amount; Described isolated body (2) is arranged between end optical fiber head (1) and first GRIN Lens (3) and by the second displacement type crystal (204) and first GRIN Lens (3) and fixes; The described inner face of going into to hold optical fiber head (1) parallels with in opposite directions the end face of first GRIN Lens (3) with it, the described inner face that goes out to hold optical fiber head (5) parallels with in opposite directions the end face of second GRIN Lens (4) with it, described first GRIN Lens (3) and second GRIN Lens (4) end face in opposite directions are perpendicular to central shaft OO ', described first GRIN Lens (3) is parallel with the optical axis of second GRIN Lens (4), identical and the adjacent focal plane of focal length overlaps, the described inner face of going into to hold optical fiber head (1) with go out to hold the inner face of optical fiber head (5) to be on the object-image conjugate position.
2. optoisolator according to claim 1 is characterized in that: the optical axis included angle between the described half-wave plate (203) and the first displacement type crystal (201) is 22.5 °.
3. optoisolator according to claim 1 and 2, it is characterized in that: the described inner face of going into to hold optical fiber head (1) is perpendicular to the plane of central shaft OO ' or has the inclined-plane of 90 °-α angle with central shaft OO ', the described inner face that goes out to hold optical fiber head (5) is perpendicular to the plane of central shaft OO ' or for having the inclined-plane of 90 °-α angle with central shaft OO ', the value of described α is 6 °～10 °.
4. optoisolator according to claim 3, it is characterized in that: the described inner face of going into to hold optical fiber head 1 with go out to hold the inner face of optical fiber head (5) all to be coated with anti-reflection film, described first GRIN Lens (3) is coated with anti-reflection film with second GRIN Lens (4) end face in opposite directions.
5. optoisolator according to claim 4 is characterized in that: described 45 ° of faraday's revolving fragments (202) are the magnetic revolving fragment, or described 45 ° of faraday's revolving fragments (202) are the non magnetic revolving fragment of peripheral hardware permanent magnetism ring.
6. optoisolator according to claim 5, it is characterized in that: the 90 °-α angle of the described inner face of going into to hold optical fiber head (1) and central shaft OO ' and describedly go out to hold the inner face of optical fiber head (5) and the 90 °-α angle of central shaft OO ', the value of described α is 8 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100181914A CN101334506A (en) | 2007-06-30 | 2007-06-30 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100181914A CN101334506A (en) | 2007-06-30 | 2007-06-30 | Optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101334506A true CN101334506A (en) | 2008-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100181914A Pending CN101334506A (en) | 2007-06-30 | 2007-06-30 | Optical isolator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902014A (en) * | 2011-04-29 | 2013-01-30 | 中国科学院西安光学精密机械研究所 | Optoisolator |
| WO2013127063A1 (en) * | 2012-02-28 | 2013-09-06 | 深圳市杰普特电子技术有限公司 | Optical isolator |
| CN105572916A (en) * | 2016-02-03 | 2016-05-11 | 深圳市镭神智能***有限公司 | Opto-isolator |
| CN109307910A (en) * | 2018-12-05 | 2019-02-05 | 珠海市杰威光电科技有限公司 | A kind of online fibre optic isolater of microminiature |
| CN112987194A (en) * | 2019-12-13 | 2021-06-18 | 讯芯电子科技（中山）有限公司 | Optical communication module |
| CN113922199A (en) * | 2021-09-28 | 2022-01-11 | 上海飞博激光科技有限公司 | Anti-return main oscillation power amplification pulse laser |
| CN114779402A (en) * | 2022-04-01 | 2022-07-22 | 深圳市欧凌镭射科技有限公司 | Integrated optical element |
-
2007
- 2007-06-30 CN CNA2007100181914A patent/CN101334506A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902014A (en) * | 2011-04-29 | 2013-01-30 | 中国科学院西安光学精密机械研究所 | Optoisolator |
| CN102902014B (en) * | 2011-04-29 | 2014-07-02 | 中国科学院西安光学精密机械研究所 | Optoisolator |
| WO2013127063A1 (en) * | 2012-02-28 | 2013-09-06 | 深圳市杰普特电子技术有限公司 | Optical isolator |
| CN103299233A (en) * | 2012-02-28 | 2013-09-11 | 深圳市杰普特电子技术有限公司 | Optical isolator |
| CN105572916A (en) * | 2016-02-03 | 2016-05-11 | 深圳市镭神智能***有限公司 | Opto-isolator |
| CN109307910A (en) * | 2018-12-05 | 2019-02-05 | 珠海市杰威光电科技有限公司 | A kind of online fibre optic isolater of microminiature |
| CN112987194A (en) * | 2019-12-13 | 2021-06-18 | 讯芯电子科技（中山）有限公司 | Optical communication module |
| CN113922199A (en) * | 2021-09-28 | 2022-01-11 | 上海飞博激光科技有限公司 | Anti-return main oscillation power amplification pulse laser |
| CN114779402A (en) * | 2022-04-01 | 2022-07-22 | 深圳市欧凌镭射科技有限公司 | Integrated optical element |
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Open date: 20081231 |