CN105572916A - Opto-isolator - Google Patents
Opto-isolator Download PDFInfo
- Publication number
- CN105572916A CN105572916A CN201610078046.4A CN201610078046A CN105572916A CN 105572916 A CN105572916 A CN 105572916A CN 201610078046 A CN201610078046 A CN 201610078046A CN 105572916 A CN105572916 A CN 105572916A
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- China
- Prior art keywords
- optoisolator
- glass tube
- birefringece crystal
- optical fiber
- light
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention belongs to the optical field, and provides an opto-isolator. An input end optical fiber collimator, a first birefringent crystal, a Faraday optical rotator, a half-wave plate, a second birefringent crystal, a narrow-passband filter and an output end optical fiber collimator are arranged in sequence in the light propagation direction of the opto-isolator. By means of the opto-isolator, the isolation effect on return light is greatly enhanced, and the filtration effect on band-pass outer wavebands is also enhanced.
Description
Technical field
The present invention is applicable to optical field, particularly relates to a kind of optoisolator.
Background technology
Flashlight, in the transmitting procedure from light source to receiving end, through many different optical interfaces, at each optical interface place, all can produce reflection in various degree, and the return light that these reflections produce finally can return light source along light path.When the intensity accumulation of return light acquires a certain degree, light source works will be caused unstable, produce the problem such as frequency drift, changes in amplitude, thus affect the normal work of whole system.
Optoisolator is a kind of the Passive Optical Components allowing Unidirectional light to pass through, its principle of work is the nonreciprocity based on Faraday rotation, the optically-active angle of the Faraday polarization apparatus of optoisolator inside is relevant with the Verdet constant of optically activ material itself, i.e. θ=BLV, wherein, θ is optically-active angle, V is Verdet constant, and for optically activ material of the same race, different wavelength is corresponding different V value again, that is when the optical wavelength change passed through, Faraday polarization apparatus also will convert the anglec of rotation of light wave, final isolation can be affected like this, so, usually the optoisolator used only has high-isolation in central wavelength, depart from centre wavelength more, isolation declines more, make to cause very large hidden danger during the application of optoisolator.
Summary of the invention
The object of the present invention is to provide a kind of optoisolator, to the narrow bandwidth light echo near centre wavelength or to other wavelength light echos that wavelength frequency displacement causes, all there is good isolation effect, thus solve the bad and hidden danger caused of the isolation effect of traditional optoisolator to wide bandwidth light echo.
The embodiment of the present invention realizes like this, a kind of optoisolator, described optoisolator optical propagation direction is disposed with: input end fiber collimating apparatus, the first birefringece crystal, Faraday polarization apparatus, half-wave plate, the second birefringece crystal, narrow bandpass filter plate, output terminal optical fiber collimator.
The optoisolator that the embodiment of the present invention provides by setting gradually input end fiber collimating apparatus, the first birefringece crystal, Faraday polarization apparatus, half-wave plate, the second birefringece crystal, narrow bandpass filter plate, output terminal optical fiber collimator on the optical propagation direction of optoisolator, enhance the isolation effect to light echo greatly, also enhance the filter effect to the logical outer wave band of band simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of optoisolator provided by the invention;
Fig. 2 is the structural representation of another kind of optoisolator provided by the invention;
Fig. 3 is the structural representation of another kind of optoisolator provided by the invention;
Fig. 4 is the structural representation of another kind of optoisolator provided by the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, 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, be not intended to limit the present invention.
The present invention realizes like this, as in Fig. 1, filtering optoisolator provided by the invention is disposed with input end fiber collimating apparatus 10, first birefringece crystal 11, Faraday polarization apparatus 12, half-wave plate 13, second birefringece crystal 14, narrow bandpass filter plate 15, output terminal optical fiber collimator 16 on optical propagation direction.
Concrete, the working beam as forward converts directional light to from input end fiber collimating apparatus 10 and is input to the first birefringece crystal 11, is divided into the identical but different two bunch polarisations in polarization direction in the direction of propagation; Two bunch polarisations are after Faraday polarization apparatus 12, polarization state all can by rotation а, polarization direction turns clockwise а (also can counterclockwise), polarization direction after half-wave plate 13 rotates в again, and therefore two bunch polarisations all have rotated а+в relative to the initial polarization direction before Faraday polarization apparatus 12; The two bunch polarisations that above-mentioned polarization state changes again synthesize light beam after the second birefringece crystal 14, again through narrow bandpass filter plate 15, after the light worked described in filtering in beam wavelength and neighbouring bandwidth, finally be coupled into described output terminal optical fiber collimator 16, complete the function that optoisolator forward passes through and filters.
After reverse light beam filters the extraneous light wave of narrow bandwidth by narrow bandpass filter plate 15, transmit and be divided into the different line polarisation in two bundle polarization directions into the second birefringece crystal 14, this two bunch polarisation is all rotated counterclockwise в through half-wave plate 13 rear polarizer direction, then through Faraday polarization apparatus 12.Backlight wavelength now is all in the scope of narrow bandwidth, the а so this two-beam still turns clockwise through Faraday polarization apparatus rear polarizer direction, then two-beam does not change relative to through the second birefringece crystal polarization direction, so when two bunch polarisations are through the first birefringece crystal, transmission direction deflects again, transmit to the direction further from optoisolator central shaft, after the first birefringece crystal outgoing, two bunch polarisations lay respectively at the upper of input end fiber collimating apparatus, lower both sides, cannot enter again in input end fiber collimating apparatus, complete the function of optoisolator reverse isolation.The optoisolator that the embodiment of the present invention provides by the light filtering outside bandwidth range in light beam, can greatly improve the buffer action of optoisolator to the light outside bandwidth range by narrow bandpass filter plate 15.
A kind of optoisolator as shown in Figure 2, described optoisolator is disposed with on optical propagation direction: input end fiber collimating apparatus 20, first birefringece crystal 21, Faraday polarization apparatus 22, half-wave plate 23, second birefringece crystal 24, narrow bandpass filter plate 25 and output terminal optical fiber collimator 26, and wherein input end fiber collimating apparatus 20 comprises the first lens 201 and the first kapillary 202;
Faraday polarization apparatus 22 comprises: a slice faraday rotator 220 and a circular ring magnet 221, and circular ring magnet 221 is arranged around faraday rotator 220;
Output terminal optical fiber collimator 26 comprises the second lens 261 and the second kapillary 262, narrow bandpass filter plate 25 and the second kapillary 262 end face not parallel, and narrow bandpass filter plate 25 surface is coated with optical thin film, described optical thin film has antiradar reflectivity to the light in the logical scope of band and has high reflectance to the logical extraneous light of band.
By described optoisolator, output terminal optical fiber collimator 26 through described in the process of the optical transport of reverse transfer is surperficial to narrow bandpass filter plate 25, light in bandwidth range normal through, because the relative optical propagation direction of narrow bandpass filter plate 25 has certain pitch angle, light then outside most of bandwidth range deflects relative to incident direction and reflects away, make the light outside described bandwidth range can not by narrow bandpass filter plate 25, output terminal optical fiber collimator 26 can not be come back to again, also prevent from again entering output terminal optical fiber collimator 26 and impact system works below while serving buffer action.
Preferably, the angle of narrow bandpass filter plate 25 and the second kapillary 262 end face is 8 °-11 °, making the light outside bandwidth range obtain utilizing emitted light relative to the deflection angle of incident direction is 16 °-22 °, also can better prevent from again entering output terminal optical fiber collimator 26 and impact system works below while serving better buffer action.
In order to better take into account cost and the effect of optoisolator, preferably, above-mentioned optical thin film leads to scope internal reflection rate < 0.5%, at scope external reflection rate > 98%, to reduce light beam loss and to realize better isolation effect at band.
Due in this kind of optoisolator, faraday rotator 220 is main pyrotoxin, temperature is too high may affect loss, so preferred, can be bonding with half-wave plate 23 by faraday rotator 220 with heat conductive silica gel, under the prerequisite retaining enough clear aperatures, connect the surrounding point of half-wave plate 23 is gluing, be then fixed in magnetic ring inner hole.
A kind of optoisolator as shown in Figure 3, described optoisolator is disposed with on optical propagation direction: input end fiber collimating apparatus 30, first birefringece crystal 31, Faraday polarization apparatus 32, half-wave plate 33, second birefringece crystal 34, narrow bandpass filter plate 35 and output terminal optical fiber collimator 36, and wherein input end fiber collimating apparatus 30 comprises the first optical fiber 300, first kapillary 301 and the first lens 302; Output terminal optical fiber collimator 36 comprises the second optical fiber 360, second kapillary 361 and the second lens 362, first birefringece crystal 31 and the second birefringece crystal 34 are identical and its single axial birefringence crystal be parallel to each other at optical propagation direction two end surfaces separately of specification, and the first birefringece crystal 31 and the second birefringece crystal 34 are not 90 degree with the angle of described optical propagation direction.
By using both ends of the surface parallel and with optical propagation direction, there is the birefringece crystal of the angle not being 90 degree, the reflected light that input end fiber collimating apparatus 30 emergent light is produced at birefringece crystal end face can not come back in input end fiber collimating apparatus 30 again, the return loss of the whole isolator of further reduction, improves the stability of work system; Make final emergent light and incident light simultaneously on same straight line, avoid the emergent light that rectangle birefringece crystal causes and offset a segment distance relative to incident light, reduce the volume of required crystal, saved cost.
Preferably, the material of the first birefringece crystal 31 and the second birefringece crystal 34 can be YVO4 or LiNbO3.
Preferably, the close face of the first kapillary 301 and the first lens 302 is parallel to each other, and the angle of described two close faces and described optical propagation direction is 8 °-11 ° spends, under the prerequisite of insertion loss not increasing collimating apparatus, at utmost can reduce the return loss of collimating apparatus like this, thus avoid making because return loss is large the whole work system of light echo to isolator place produce interference.
As an alternative embodiment of the invention, a kind of optoisolator as shown in Figure 4, described optoisolator is disposed with on optical propagation direction: input end fiber collimating apparatus 40, first birefringece crystal 41, Faraday polarization apparatus 42, half-wave plate 43, second birefringece crystal 44, narrow bandpass filter plate 45, first glass tube 46 second glass tube 47 and output terminal optical fiber collimator 48;
Wherein, input end fiber collimating apparatus 40 comprises the first optical fiber 400, first lens 402 and the first kapillary 401;
Output terminal optical fiber collimator 48 comprises the first optical fiber 480, second lens 482 and the second kapillary 481;
Second glass tube 47 and the first glass tube 46 hollow, the internal diameter of the second glass tube 47 is greater than the internal diameter of described first glass tube 46, and the first glass tube 46 both ends of the surface are not parallel, first glass tube 46 one end is connected to narrow bandpass filter plate 45, other end is parallel to the end face of the second kapillary 481 of output terminal optical fiber collimator 48, make narrow bandpass filter plate 45 be not parallel to the end face of the second kapillary 481 of output terminal optical fiber collimator 48, the second glass tube 47 is socketed the first glass tube 46 and the second kapillary 482; Between first glass tube 46 and narrow bandpass filter plate 45, between the second glass tube 47 and the first glass tube 46, fixed by some glue between the second glass tube 47 and the second kapillary 482.By the socket of the first glass tube 46 and the second glass tube 47, narrow bandpass filter plate 45 and output terminal optical fiber collimator 48 are better fixed together, are convenient to practical operation like this and the vibration resistance of optoisolator can be improved.Preferably, the length over half of the first glass tube 46 is inserted in the second glass tube 47, to reduce the spacing of output terminal optical fiber collimator 48 and the first glass tube 46, device shock resistance can be ensured, also reduce narrow bandpass filter plate 45 and the spacing of output terminal optical fiber collimator 48, facilitate the adjustment of light path.
Preferably, for cost-saving and Simplified flowsheet, the shell of final optoisolator can make by a monoblock aluminium alloy to process groove mode in inside, is bonded in groove by all parts by light path order, then dust cap in upper cover, guarantees the cleaning of crystal inside.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an optoisolator, it is characterized in that, described optoisolator optical propagation direction is disposed with: input end fiber collimating apparatus, the first birefringece crystal, Faraday polarization apparatus, half-wave plate, the second birefringece crystal, narrow bandpass filter plate, output terminal optical fiber collimator.
2. optoisolator as claimed in claim 1, it is characterized in that, the light-incident end of described narrow bandpass filter plate end face and described output terminal optical fiber collimator is not parallel.
3. optoisolator as claimed in claim 2, it is characterized in that, the angle of the light-incident end of described narrow bandpass filter plate and described output terminal optical fiber collimator is 8 degree to 11 degree.
4. optoisolator as claimed in claim 2, is characterized in that, described optoisolator also comprises hollow second glass tube and hollow and uneven first glass tube of both ends of the surface, and the internal diameter of described second glass tube is greater than the internal diameter of described first glass tube;
Described output terminal optical fiber collimator also comprises the second lens, the second kapillary and the second optical fiber that arrange along optical propagation direction successively;
Described narrow bandpass filter plate is fixed to one end of described first glass tube, and the other end of described first glass tube is parallel to described second lens, makes described narrow bandpass filter plate be not parallel to the end face of described second lens;
Described second glass tube described first glass tube of socket and described second lens.
5. optoisolator as claimed in claim 1, it is characterized in that, described narrow bandpass filter plate surface is coated with optical thin film, and described optical thin film has antiradar reflectivity to the light in the logical scope of band, and has high reflectance to the logical extraneous light of band.
6. optoisolator as claimed in claim 1, it is characterized in that, the material of main part of described first birefringece crystal and described second birefringece crystal is YVO4 or LiNbO3.
7. optoisolator as claimed in claim 1, it is characterized in that, described first birefringece crystal is that a pair specification is identical with described second birefringece crystal, and at the parallel single axial birefringence crystal of two end surfaces of described optical propagation direction.
8. optoisolator as claimed in claim 7, it is characterized in that, the angle of described first birefringece crystal and described second birefringece crystal and the described direction of propagation is not 90 degree.
9. optoisolator as claimed in claim 1, it is characterized in that, described Faraday polarization apparatus comprises: a slice faraday rotator and a circular ring magnet, described circular ring magnet is arranged around described faraday rotator.
10. optoisolator as claimed in claim 1, it is characterized in that, described input end fiber collimating apparatus is disposed with along the direction of propagation of light: the first optical fiber, the first lens and the first kapillary, wherein, the close face of described first lens and described first kapillary is parallel to each other, and the angle of described two relative faces and described optical propagation direction is 8 degree to 11 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610078046.4A CN105572916A (en) | 2016-02-03 | 2016-02-03 | Opto-isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610078046.4A CN105572916A (en) | 2016-02-03 | 2016-02-03 | Opto-isolator |
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| Publication Number | Publication Date |
|---|---|
| CN105572916A true CN105572916A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610078046.4A Pending CN105572916A (en) | 2016-02-03 | 2016-02-03 | Opto-isolator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226925A (en) * | 2016-08-31 | 2016-12-14 | 欧阳征标 | Non-leakage magnetic optical thin film magnetic surface fast wave optical diode |
| CN113009631A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Multifunctional optical isolator, amplifier, laser and debugging method |
| CN113466995A (en) * | 2021-07-16 | 2021-10-01 | 厦门贝莱信息科技有限公司 | Manufacturing process of online isolator with filtering function |
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| CN103852825A (en) * | 2014-03-04 | 2014-06-11 | 青岛海泰光电技术有限公司 | Optical isolator |
| CN103869505A (en) * | 2012-12-17 | 2014-06-18 | 福州高意通讯有限公司 | Large-aperture polarization independent high-power isolator |
| CN205427370U (en) * | 2016-02-03 | 2016-08-03 | 深圳市镭神智能系统有限公司 | An optical separator |
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| US6081635A (en) * | 1997-06-18 | 2000-06-27 | Alcatel | Microoptical module with a WDM filter and an optical isolator for fiber-optic amplifier systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226925A (en) * | 2016-08-31 | 2016-12-14 | 欧阳征标 | Non-leakage magnetic optical thin film magnetic surface fast wave optical diode |
| CN113009631A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Multifunctional optical isolator, amplifier, laser and debugging method |
| CN113466995A (en) * | 2021-07-16 | 2021-10-01 | 厦门贝莱信息科技有限公司 | Manufacturing process of online isolator with filtering function |
| CN113466995B (en) * | 2021-07-16 | 2024-02-23 | 厦门贝莱信息科技有限公司 | On-line isolator manufacturing process with filtering function |
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Application publication date: 20160511 |