CN110231722A - A kind of optoisolator - Google Patents
A kind of optoisolator Download PDFInfo
- Publication number
- CN110231722A CN110231722A CN201910454895.9A CN201910454895A CN110231722A CN 110231722 A CN110231722 A CN 110231722A CN 201910454895 A CN201910454895 A CN 201910454895A CN 110231722 A CN110231722 A CN 110231722A
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- CN
- China
- Prior art keywords
- light
- birefringece crystal
- optoisolator
- crystal
- isolator core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
-
- 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
- G02F1/095—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 in an optical waveguide structure
- G02F1/0955—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 in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The present invention discloses a kind of optoisolator, includes input/output optical fiber head, at least one isolator core, lens；The isolator core is placed in input/output optical fiber head end.The isolator core is by the first birefringece crystal, Faraday rotator, half-wave plate and the second birefringece crystal composition, and first birefringece crystal and second birefringece crystal are all light passing surface parallel crystals, and thickness is identical；Light enters the isolator core through the input optical fibre head end diverging light, it is divided into the o light and e light of diverging through the first birefringece crystal, through 90 ° of the Faraday rotator and half-wave plate polarization direction corotating, the o light for being incident on the second birefringece crystal is consistent with the e light polarization direction of the second birefringent crystalline substance, e light is consistent with the o light polarization direction of the second birefringent crystalline substance, therefore enters output optical fibre head through the second birefringent brilliant a branch of diverging optical coupling lens of synthesis.When reversed, due to faraday's nonreciprocity, isolated light cannot synthesize light beam, cannot be coupled out.
Description
[technical field]
The invention belongs to fiber optic passive device fields, and in particular to the optical isolation of fiber optic communication field and field of lasers
Device, more particularly to the unrelated fibre optic isolater of polarization.
[background technique]
In fiber optic communication systems, backlight meeting interference signal modulates laser works in optical fiber, and laser is caused to export
Optical signal is distorted, is unstable, it is therefore desirable to which a kind of device prevents the optical fibre device of backlight passback realization one-way conduction.Optical fiber every
It is a kind of nonreciprocity optical passive component for only allowing light one-way transmission from device, for eliminate or inhibit to generate in fiber channel
Backlight, in fiber optic communication systems with had very important effect in field of lasers.
Belong to ordinary optic fibre using optical fiber in general optical fiber telecommunications system, polarised light transmit in a fiber be light polarization state
It cannot keep, therefore so that optoisolator is belonged to the unrelated fibre optic isolater of polarization in general optical fiber telecommunications system.It is general on the market
Logical polarization independent optical isolator is as shown in Figure 1, place a faraday rotator in 11 optical fiber wedge 12 of birefringece crystal wedge
13, three pieces combination is commonly referred to as isolator core.The optical axis of wedge 11 and wedge 12 is at 45 °, and faraday rotator 13 rotates angle
It is 45 °.Single fiber collimator 14 is used as input terminal, and single fiber collimator 15 is used as output end.
Isolator core is made of two panels birefringece crystal wedge and faraday rotator, since birefringece crystal has the angle of wedge,
Therefore each isolator core needs to debug two birefringece crystal wedges of matching, reaches ideal isolation, the isolation of this structure
Device core assembles and adjusts extremely complex cumbersome, and cost of labor is higher.It installs both sides collimator adjustment additional again, welds, working hour is higher；Add
On be collimation hot spot entrance crystal, the area of crystal is larger；Because collimation hot spot is big, Yao Tigao device isolation degree is just needed two-fold
Penetrating crystal thickness increase keeps reversed photo-fission wider, and material cost just will increase.
[summary of the invention]
It is an object of the present invention to provide a kind of assembly simply, is easy to the fibre optic isolater produced in batches.
To achieve the goals above, cost is reduced, the light of optical fiber end output is directly entered isolator core, because of fiber exit
Hot spot is small, so the effective clear field of isolator core can be with very little.
The present invention provides a kind of optoisolator, which is characterized in that includes input/output optical fiber head, at least one isolator
Core, lens；The isolator core is placed in input/output optical fiber head end.The isolator core is by the first birefringece crystal, farad
Rotator, half-wave plate and the second birefringece crystal composition, first birefringece crystal and second birefringece crystal are all
It is light passing surface parallel crystal, and thickness is identical.
A kind of optoisolator, it is characterised in that the lens are the lens or two lens groups that a both sides are assembled.
A kind of optoisolator, it is characterised in that the Faraday rotator rotation light polarization rotation angle is 45 degree.
A kind of optoisolator, it is characterised in that the half-wave plate and the setting of La rotator are birefringent described first
Between crystal and second birefringece crystal.
Above-mentioned optoisolator at least has the advantages that lower:
(1) above-mentioned optical fiber head emergent light spot is very small, and the clear field of isolator core requires also very small, birefringece crystal
Can very thin very little, the clear field of Faraday polarization apparatus requires also very small；Greatly save material cost.
(2) first birefringece crystals and the second birefringece crystal are two sides parallel crystals, and thickness is identical, therefore isolator
Polarization Dependent Loss and polarization mode dispersion it is all very small.
(3) isolator core has half-wave plate, can make up and draw the correlation rotatory dispersive of rotator wavelength, make the operation of isolator
Wavelength is more widened, and temperature characterisitic is more preferable.
(4) optoisolator core is by the first birefringece crystal, Faraday rotator, half-wave plate and the second birefringece crystal group
At, first birefringece crystal and second birefringece crystal are all light passing surface parallel crystals, and thickness is identical, because
It is the direct output light of optical fiber by isolator core, refracting crystal can design very thin, therefore the folding of large area can be used in we
The half-wave plate debugging for penetrating crystal, the Faraday rotator of large area, large area is assembled into large area isolator core, is then cut into
The countless smaller isolator cores of clear field.It is easy to mass, automated production
[Detailed description of the invention]
The existing polarization independent optical isolator of Fig. 1；
Fig. 2 a is the 1st example structure schematic diagram of optoisolator of the invention
Fig. 2 b is the 1st reversed schematic diagram of example structure light of optoisolator of the invention；
Fig. 3 is the 2nd example structure schematic diagram of optoisolator of the invention；
[specific embodiment]
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.
Fig. 2 a be the 1st embodiment of optoisolator of the invention, in the present embodiment, optoisolator by input optical fibre head 21,
Isolator core 22, lens 23 and input optical fibre head 24 form, and wherein isolator core 22 is by the first birefringece crystal 221, half-wave plate
222, Faraday rotator 223 and the second birefringece crystal 224 composition.When light forward direction is transmitted, optical signal goes out from single fiber head 21
The light of a misconvergence of beams is penetrated, the first birefringece crystal 221 is injected, the first birefringece crystal 221 splits light into the orthogonal e of polarization
Light and o light, the e light and o light of diverging are through half-wave plate 222, because, at 22.5 ° of angles, the e light and o light of diverging pass through with 222 optical axis of half-wave plate
Half-wave plate 222 retrodeviates polarization state and is rotated by 45 °；Turn device 223 through faraday again and retrodeviate polarization state to be rotated by 45 ° again, corotating
90 °, o light is consistent with the e light polarization of the second birefringece crystal 224 at this time, the o light polarization one of e light and the second birefringece crystal 224
It causes, two-beam synthesizes a branch of diverging light in the second birefringece crystal 224, and diverging light is assembled through the coupling of lens 23 enters single fiber head
24 outputs.
When light reversely inputs, as shown in Figure 2 b, optical signal is emitted the light of a misconvergence of beams from single fiber head 24, and diverging light is through saturating
The coupling of mirror 23, which is assembled, injects the second birefringece crystal 224, and the second birefringece crystal 224 splits light into the orthogonal e light of polarization
With o light, the e light and o light of convergence through faraday turn device 223 and retrodeviate polarization state to be rotated by 45 ° again, and at this time with 222 light of half-wave plate
At 67.5 ° of angles, the e light and o light of convergence retrodeviate polarization state through half-wave plate 222 and are rotated by 135 ° axis, and 180 ° of corotating, o light at this time
Vertical with the e light polarization of the first birefringece crystal 221, e light is vertical with the o light polarization of the first birefringece crystal 221, by first
After birefringece crystal 221, light does not close beam but more separates, and is unable to the output of coupled into optical fibres 21, realizes reversed optical isolation.
Fig. 3 is the 2nd embodiment of optoisolator of the invention, and in this embodiment, isolator core 32 and isolator core 35 divide
It is not placed in 31 end of input optical fibre head and output optical fibre head 36, two lens 33 and lens 34 are placed in centre.Light passes through input optical fibre
First 31 arrive lens 33, output collimator light；The collimator output formed through optical fiber head 36 and lens 34, there are two in collimator
Isolator core forms bipolar separators.Reverse isolation principle is consistent with the 1st embodiment.
The upper embodiment only expresses several exemplary embodiments of the invention, is not all.Technology people of the same trade
Member is modified slightly, such as increases lens, and it is also scope that composition lens group either two groups of isolator cores, which are superimposed,.
Claims (7)
1. a kind of optoisolator, which is characterized in that include input optical fibre head, at least one isolator core, lens, output optical fibre
Head；The isolator core is placed in output/output optical fibre head end.
2. a kind of optoisolator according to claim 1, it is characterised in that the isolator core is by the first birefringece crystal, method
Draw rotator, half-wave plate and the second birefringece crystal composition.
3. a kind of optoisolator according to claim 1, it is characterised in that the lens be the lens that both sides are assembled or
Two or more lens groups.
4. a kind of optoisolator according to claim 2, it is characterised in that the Faraday rotator rotation light polarization rotation
Angle is 45 degree.
5. according to a kind of optoisolator described in claim 2, it is characterised in that first birefringece crystal and described second two-fold
Penetrating crystal all is light passing surface parallel crystal, and thickness is identical.
6. a kind of optoisolator according to claim 2, it is characterised in that the half-wave plate setting is birefringent described first
Between crystal and second birefringece crystal.
7. a kind of optoisolator according to claim 2, it is characterised in that the Faraday rotator is arranged described first
Between birefringece crystal and second birefringece crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454895.9A CN110231722A (en) | 2019-05-29 | 2019-05-29 | A kind of optoisolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454895.9A CN110231722A (en) | 2019-05-29 | 2019-05-29 | A kind of optoisolator |
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| Publication Number | Publication Date |
|---|---|
| CN110231722A true CN110231722A (en) | 2019-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910454895.9A Pending CN110231722A (en) | 2019-05-29 | 2019-05-29 | A kind of optoisolator |
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| CN (1) | CN110231722A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347158A (en) * | 2020-03-20 | 2020-06-30 | 华中科技大学 | Compound welding set of semiconductor blue light laser and fiber laser |
| CN115032745A (en) * | 2022-08-15 | 2022-09-09 | 光越科技(深圳)有限公司 | Online optical isolator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4712880A (en) * | 1982-06-28 | 1987-12-15 | Fujitsu Limited | Polarization rotation compensator and optical isolator using the same |
| CN1365011A (en) * | 2000-07-14 | 2002-08-21 | Jds尤尼费斯公司 | Beam splitter and beam combiner with isolated polarized beam |
| JP2004029334A (en) * | 2002-06-25 | 2004-01-29 | Sumitomo Metal Mining Co Ltd | Optical isolator module |
-
2019
- 2019-05-29 CN CN201910454895.9A patent/CN110231722A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4712880A (en) * | 1982-06-28 | 1987-12-15 | Fujitsu Limited | Polarization rotation compensator and optical isolator using the same |
| CN1365011A (en) * | 2000-07-14 | 2002-08-21 | Jds尤尼费斯公司 | Beam splitter and beam combiner with isolated polarized beam |
| JP2004029334A (en) * | 2002-06-25 | 2004-01-29 | Sumitomo Metal Mining Co Ltd | Optical isolator module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347158A (en) * | 2020-03-20 | 2020-06-30 | 华中科技大学 | Compound welding set of semiconductor blue light laser and fiber laser |
| CN115032745A (en) * | 2022-08-15 | 2022-09-09 | 光越科技(深圳)有限公司 | Online optical isolator |
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Application publication date: 20190913 |