CN105629386A - Optical isolator - Google Patents
Optical isolator Download PDFInfo
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- CN105629386A CN105629386A CN201410624463.5A CN201410624463A CN105629386A CN 105629386 A CN105629386 A CN 105629386A CN 201410624463 A CN201410624463 A CN 201410624463A CN 105629386 A CN105629386 A CN 105629386A
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Abstract
An optical isolator provided by the present invention comprises orderly, along a transmission direction of the positive incident light, a polarizer; a first Faraday rotating plate of which a rotation angle is 45-degree; and a polarization analyzer. A polarization direction rotator is also arranged at the emergent light end of the polarization analyzer and has an emergent light polarization direction rotation angle alpha, and the alpha is greater than 0 degree. By the optical isolator of the above structures, the emergent light end of the polarization analyzer also comprises the polarization direction rotator, so that a final emergent light polarization direction can be the arbitrary direction. The polarization direction rotator can be a half wave plate or a second Faraday rotating plate, and enables the emergent light polarization direction of the polarization analyzer to rotate an arbitrary angle greater than 0 degree, thereby satisfying the special application of needing to adjust the emergent light polarization direction.
Description
Technical field
The present invention relates to high speed optical communication device, particularly relate to a kind of optoisolator.
Background technology
Two-forty, distance fiber-optic transfer in need with optoisolator stop reflection light, optoisolator is a kind of the Passive Optical Components allowing Unidirectional light to pass through, its operation principle is based on the nonreciprocity of Faraday rotation, the optoisolator of prior art, including: a polarizer, a Faraday rotation sheet and an analyzer. For the flashlight of forward entrance, by becoming line polarized light after the polarizer, Faraday rotation sheet makes the polarization side of flashlight rotate 45 �� together with external magnetic field, and the analyzer of optical direction and the placement at 45 �� of polarizer optical direction is passed through in low-loss just. For backlight, by the line polarized light after analyzer through Faraday rotation sheet, yawing moment rotates 45 �� along the identical optical direction of incident illumination again, so that the polarization direction of backlight is orthogonal with polarizer optical direction, can not pass through, thus block the transmission of backlight completely. This structured light isolator requires the deflection that forward entrance light polarization direction and emergent light polarization direction need to strictly meet 45 ��, this principle defect, limit it and need, at some, the special applications made adjustment in emergent light polarization direction, when closing ripple such as polarization splitting prism, require that two bundle incident light polarization directions are vertical, and chip of laser emergent light is typically all horizontal polarization, usual this situation all can select rotary laser chip, thus causing the complexity of structure and technique to be significantly increased.
Summary of the invention
For overcoming disadvantage mentioned above, the present invention provides a kind of optoisolator, and its emergent light polarization direction can be any direction.
For reaching above goal of the invention, the present invention adopts the following technical scheme that a kind of optoisolator, and the transmission direction along forward entrance light includes successively: a polarizer; One first Faraday rotation sheet, its optically-active angle is 45 ��; With an analyzer, be positioned at this analyzer emergent light end and also include a polarization rotator, its emergent light polarization direction anglec of rotation is ��, this �� > 0 ��.
Described polarization rotator is half of wave plate, and its optical axis and described analyzer optical direction angle are ��/2.
Described polarization rotator is one second Faraday rotation sheet.
Optoisolator due to said structure, its analyzer emergent light end also includes a polarization rotator, its final emergent light polarization direction can be any direction, this polarization rotator can be half of wave plate or one second Faraday rotation sheet, the light polarization direction that goes out of analyzer can be rotated arbitrarily angled more than 0 ��, meet the special applications made adjustment in emergent light polarization direction by needs.
Accompanying drawing explanation
Fig. 1 represents optoisolator first embodiment light channel structure schematic diagram of the present invention;
Fig. 2 represents optoisolator of the present invention second embodiment light channel structure schematic diagram.
L detailed description of the invention
Preferred embodiment is described in detail below in conjunction with accompanying drawing.
First embodiment optoisolator as shown in Figure 1, the transmission direction along forward entrance light includes successively: a polarizer 10; One first Faraday rotation sheet 20, its optically-active angle is 45 �� and an analyzer 30, is positioned at this analyzer 30 emergent light end and also includes a polarization rotator 40, and its emergent light polarization direction anglec of rotation is ��, this �� > 0 ��. In the present embodiment, this polarization rotator 40 is half of wave plate, and its optical axis and described analyzer 30 optical direction angle are ��/2. When forward optical transport, with the optical direction directional light component of the polarizer 10 by the polarizer 10 in incident illumination, then it is polarized device 10 with optical direction vertical light component to absorb, after entering the first Faraday rotation sheet 20 by the line polarized light of the polarizer 10, under Faraday effect effect, polarization direction rotates 45 degree, just parallel with the optical direction of analyzer 30, therefore without loss analyzer 30 can be passed through, by after line polarized light then through half-wave plate 40, make outgoing light polarization direction have rotated angle [alpha], complete forward optic path. Owing to �� is arbitrarily angled more than 0 ��, so the polarization direction of final emergent light can meet the demand of any direction. Simultaneously, when backlight transmits, the backlight of arbitrary polarized direction is after half-wave plate 40, its polarization direction anglec of rotation is similarly ��, but still it is rendered as any direction, wherein directly absorbed by analyzer 30 with analyzer 30 optical direction vertical light component, lossless with analyzer 30 optical direction directional light component pass through, subsequently into the first Faraday rotation sheet 20; Owing to the optical direction of Faraday rotation sheet 20 is solely dependent upon magnetic direction, therefore when reflective to when transmitting, optical direction when optical direction is with forward optical transport is consistent, after have rotated 45 �� equally, now the polarization direction of backlight is vertical with the optical direction of the polarizer 10, this vertical light component will be polarized device 10 and absorb, and therefore backlight cannot arrive the input of the polarizer 10, thus realizing the effect of isolation backlight.
Second embodiment optoisolator as shown in Figure 2, the transmission direction along forward entrance light includes successively: a polarizer 10, one first Faraday rotation sheet 20, its optically-active angle is 45 ��, with an analyzer 30, be positioned at this analyzer 30 emergent light end and also include a polarization rotator 41, its emergent light polarization direction anglec of rotation is ��, this �� > 0 ��. in the present embodiment, this polarization rotator 41 is one second Faraday rotation sheet. when light forward transmits, with the optical direction directional light component of the polarizer 10 by the polarizer 10 in incident illumination, it is polarized device 10 with the polarizer 10 optical direction vertical light component to absorb, after entering the first Faraday rotation sheet 20 by the line polarized light of the polarizer 10, under Faraday effect effect, polarization direction rotates 45 ��, just parallel with the optical direction of analyzer 30, this line polarized light without loss can pass through analyzer 30, then then through the second faraday rotator 41, its emergent light polarization direction anglec of rotation is ��, completes forward optic path. owing to �� is arbitrarily angled more than 0 �� so that emergent light polarization direction can be any direction. simultaneously, when backlight transmits, the backlight of arbitrary polarized direction is after the second faraday rotator 41, owing to the optical direction of Faraday rotation sheet 41 is solely dependent upon magnetic direction, therefore when reflective to when transmitting, optical direction when optical direction is with forward optical transport is consistent, the anglec of rotation is similarly ��, but still it is rendered as any direction, wherein directly absorbed by analyzer 30 with analyzer 30 optical direction vertical light component, lossless with analyzer 30 optical direction directional light component pass through, subsequently into the first Faraday rotation sheet 20, along optical direction the same during with forward optical transport, after same rotation 45 ��, the polarization direction in this time is vertical with the optical direction of the polarizer 10, this vertical light component is polarized device 10 and absorbs, therefore backlight cannot arrive the input of the polarizer 10, thus realizing the effect of isolation backlight.
In above-mentioned two embodiments, analyzer 30 goes out no matter light end adopts half-wave plate 40 or the second Faraday rotation sheet 41, except realizing, common isolator forward light is lossless or low damage is passed through, outside the basic function of isolation backlight, can also arbitrarily adjust the polarization direction of emergent light, thus meeting the application that output direction of polarized light is had particular/special requirement.
Claims (3)
1. an optoisolator, the transmission direction along forward entrance light includes successively: a polarizer; One first Faraday rotation sheet, its optically-active angle is 45 ��; With an analyzer, it is characterised in that being positioned at this analyzer emergent light end and also include a polarization rotator, its emergent light polarization direction anglec of rotation is ��, this �� > 0 ��.
2. optoisolator as claimed in claim 1, it is characterised in that described polarization rotator is half of wave plate, and its optical axis and described analyzer optical direction angle are ��/2.
3. optoisolator as claimed in claim 1, it is characterised in that described polarization rotator is one second Faraday rotation sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410624463.5A CN105629386A (en) | 2014-11-07 | 2014-11-07 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410624463.5A CN105629386A (en) | 2014-11-07 | 2014-11-07 | Optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105629386A true CN105629386A (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410624463.5A Pending CN105629386A (en) | 2014-11-07 | 2014-11-07 | Optical isolator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019617A (en) * | 2016-07-28 | 2016-10-12 | 中国工程物理研究院应用电子学研究所 | Optical isolation beam combining device |
| CN107238952A (en) * | 2017-06-30 | 2017-10-10 | 深圳市创鑫激光股份有限公司 | Adjust method, fibre optic isolater and the optical fiber laser of isolation |
| CN108169857A (en) * | 2017-12-27 | 2018-06-15 | 中国科学院半导体研究所 | A kind of bidirectional optical amplifier transmitted applied to extra long distance split-second precision |
| CN112799185A (en) * | 2021-04-14 | 2021-05-14 | 武汉恩达通科技有限公司 | Four-port circulator for single-fiber bidirectional communication and optical module |
| CN113281922A (en) * | 2021-05-21 | 2021-08-20 | 中国科学院半导体研究所 | Light emitting module |
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| EP0665452A1 (en) * | 1994-01-28 | 1995-08-02 | Namiki Precision Jewel Co., Ltd. | Polarization independent optical isolator |
| CN201569820U (en) * | 2009-07-21 | 2010-09-01 | 昂纳信息技术（深圳）有限公司 | Optical isolator |
| CN202472172U (en) * | 2012-03-16 | 2012-10-03 | 深圳新飞通光电子技术有限公司 | Polarization direction rotator and light component thereof |
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| CN203745678U (en) * | 2014-03-12 | 2014-07-30 | 武汉电信器件有限公司 | Polarization-maintaining isolator |
| CN203799143U (en) * | 2014-03-20 | 2014-08-27 | 昂纳信息技术（深圳）有限公司 | Novel optical isolator |
| CN204116645U (en) * | 2014-11-07 | 2015-01-21 | 深圳新飞通光电子技术有限公司 | A kind of optoisolator |
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2014
- 2014-11-07 CN CN201410624463.5A patent/CN105629386A/en active Pending
Patent Citations (7)
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| EP0665452A1 (en) * | 1994-01-28 | 1995-08-02 | Namiki Precision Jewel Co., Ltd. | Polarization independent optical isolator |
| CN201569820U (en) * | 2009-07-21 | 2010-09-01 | 昂纳信息技术（深圳）有限公司 | Optical isolator |
| CN202472172U (en) * | 2012-03-16 | 2012-10-03 | 深圳新飞通光电子技术有限公司 | Polarization direction rotator and light component thereof |
| CN202677010U (en) * | 2012-06-14 | 2013-01-16 | 昂纳信息技术（深圳）有限公司 | Free space isolator |
| CN203745678U (en) * | 2014-03-12 | 2014-07-30 | 武汉电信器件有限公司 | Polarization-maintaining isolator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019617A (en) * | 2016-07-28 | 2016-10-12 | 中国工程物理研究院应用电子学研究所 | Optical isolation beam combining device |
| CN106019617B (en) * | 2016-07-28 | 2018-11-06 | 中国工程物理研究院应用电子学研究所 | A kind of optically isolated beam merging apparatus |
| CN107238952A (en) * | 2017-06-30 | 2017-10-10 | 深圳市创鑫激光股份有限公司 | Adjust method, fibre optic isolater and the optical fiber laser of isolation |
| CN108169857A (en) * | 2017-12-27 | 2018-06-15 | 中国科学院半导体研究所 | A kind of bidirectional optical amplifier transmitted applied to extra long distance split-second precision |
| CN112799185A (en) * | 2021-04-14 | 2021-05-14 | 武汉恩达通科技有限公司 | Four-port circulator for single-fiber bidirectional communication and optical module |
| CN113281922A (en) * | 2021-05-21 | 2021-08-20 | 中国科学院半导体研究所 | Light emitting module |
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