CN107966764A - A kind of depolarized system for polarised light and depolarized method - Google Patents
A kind of depolarized system for polarised light and depolarized method Download PDFInfo
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- CN107966764A CN107966764A CN201810026762.7A CN201810026762A CN107966764A CN 107966764 A CN107966764 A CN 107966764A CN 201810026762 A CN201810026762 A CN 201810026762A CN 107966764 A CN107966764 A CN 107966764A
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- 238000000034 method Methods 0.000 title claims description 17
- 230000010287 polarization Effects 0.000 claims abstract description 148
- 239000013307 optical fiber Substances 0.000 claims abstract description 102
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 239000000835 fiber Substances 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 13
- 230000000644 propagated effect Effects 0.000 claims description 4
- 230000004927 fusion Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/276—Removing selected polarisation component of light, i.e. polarizers
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2786—Reducing the polarisation degree, i.e. depolarisers, scramblers, unpolarised output
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A kind of depolarized system for polarised light, employing 3dB energy beam splitting polarization-maintaining beam splitters is, the incidence end of polarization-maintaining beam splitter is connected with the first polarization maintaining optical fibre, the exit end of polarization-maintaining beam splitter connects the second polarization maintaining optical fibre, the 3rd polarization maintaining optical fibre respectively, the incidence end of polarization beam apparatus is connected to the 4th polarization maintaining optical fibre and the 5th polarization maintaining optical fibre, second polarization maintaining optical fibre be connected with the 4th polarization maintaining optical fibre to be formed it is long-armed, 3rd polarization maintaining optical fibre is connected to form galianconism with the 5th polarization maintaining optical fibre, the long-armed generation distance for being more than transmission light coherence time with the arm length difference of galianconism.Compared with prior art, the present invention is made of polarization-maintaining beam splitter and polarization beam apparatus, the fusion point of optical fiber need not deflect 45 ° to axis between two devices, using 0 ° to axis, an optical fiber can be used to connect between such two device, in addition, the depolarized system is overlapped only with two-stage device, substantial amounts of polarization maintaining optical fibre is saved, not only reduces the complexity of system, while reduces production cost.
Description
Technical field
The present invention relates to quantum phase coding techniques field, more particularly to a kind of depolarized system for polarised light and depolarized
Method.
Background technology
Depolarized technology is to eliminate a kind of effective ways of polarization-dependent effects in single mode optical fiber application system, in long range light
Play an important roll in the system such as fiber communication, relevant sensing and measurement, with the development of network communication, the data biography of fiber optic network
Speed is sent to be getting faster, it is also higher and higher to the capacity requirement of fiber optic network.Existing fiber network transmission is mostly polarised light,
The interference to polarization sensitive such as the device Polarization Dependent Loss that thus brings, Polarization-Dependent Gain, all influences fiber optic network and passes
The quality of defeated signal.Therefore, some existing fiber optic networks are realized using optics depolarizer carries out depolarized processing to polarised light, with
Polarised light is become into non-polarized light.
As shown in Figure 1, Chinese invention patent (Authorization Notice No.：CN102221729B a kind of optics depolarizer) is disclosed,
Connected respectively by polarization maintaining optical fibre using first order polarization beam apparatus, second level luminous energy distribution devices and the 3rd pole polarization beam combiner
Connect, the depolarized of light, the no depolarized length depending on polarization maintaining optical fibre of luminous energy are realized by the optical path difference of two optical fiber between two-stage device
The ratio of degree difference and polarization maintaining optical fibre refractive index, rather than polarization maintaining optical fibre length and the ratio of polarization maintaining optical fibre refractive index difference, therefore
It the i.e. achievable light source longer to coherence length of less optical fiber can be used to carry out depolarized, that is, disappear to quasi-monochromatic light
Partially, above-mentioned depolarizer is carried out depolarized using three-level device, and polarization maintaining optical fibre quantity is added in system；Second level luminous energy distributor
When part and the 3rd pole polarization beam combiner carry out welding by respective polarization maintaining optical fibre, optical fiber fusion welding point need 45° angle to axis,
Add numerous and diverse degree of device fabrication.
The content of the invention
Present invention aims at a kind of depolarized system for polarised light and depolarized method is provided, adopted with solving depolarizer
Carried out with three-level device depolarized, cause to add polarization maintaining optical fibre quantity in system；Second level luminous energy distribution devices and the 3rd pole
Polarization beam combiner by respective polarization maintaining optical fibre carry out welding when, optical fiber fusion welding point need 45° angle to axis, add device and add
The technical problem of numerous and diverse degree of work.
The technical proposal of the invention is realized in this way：
A kind of depolarized system for polarised light, including the polarization-maintaining beam splitter of front end and the polarization beam apparatus of rear end, institute
It is 3dB energy beam splitting to state polarization-maintaining beam splitter, and the incidence end of the polarization-maintaining beam splitter is connected with the first polarization maintaining optical fibre, the polarization-maintaining point
The exit end of beam device connects the second polarization maintaining optical fibre, the 3rd polarization maintaining optical fibre respectively, and the incidence end of the polarization beam apparatus connects respectively
There are the 4th polarization maintaining optical fibre and the 5th polarization maintaining optical fibre, the exit end connection single mode optical fiber of the polarization beam apparatus, described second protects
Polarisation fibre is connected to be formed long-armed with the 4th polarization maintaining optical fibre, and the 3rd polarization maintaining optical fibre is connected to form galianconism with the 5th polarization maintaining optical fibre,
The long-armed generation distance for being more than or equal to transmission light coherence time with the arm length difference of galianconism is less than the transmission optical superposition time
Generation distance.
Preferably, the described long-armed and arm length difference of galianconism is more than the generation distance of transmission light coherence time and is less than transmission light
It is superimposed the generation distance of time.
Preferably, second polarization maintaining optical fibre is integrated with the 4th polarization maintaining optical fibre is made, the 3rd polarization maintaining optical fibre and
Five polarization maintaining optical fibres, which are integrated, to be made.
Preferably, second polarization maintaining optical fibre and the 4th polarization maintaining optical fibre carry out 0 ° of welding, the 3rd polarization maintaining optical fibre and the
Five polarization maintaining optical fibres carry out 0 ° of welding.
A kind of depolarized method of polarised light, comprises the following steps：
1) polarization-maintaining beam splitter of the laser for sending laser Jing Guo 3dB energy beam splitting is divided into that intensity is equal, polarization state phase
Two same beam emergent lights；
2) two-way emergent light is corresponded to along the second polarization maintaining optical fibre, the 4th polarization maintaining optical fibre and the 3rd polarization maintaining optical fibre, the respectively
The slow axis of five polarization maintaining optical fibres is propagated；
3) two-beam by galianconism with it is long-armed synthesize along respective slow axis into polarization beam apparatus it is a branch of, it is described long-armed and
The generation distance that the arm length difference of galianconism is more than or equal to transmission light coherence time is less than the generation distance for transmitting the optical superposition time；
4) one-component is transmitted along the slow axis of polarization beam apparatus exit end single-mode fiber in polarization beam apparatus, another point
Amount is transmitted along the fast axle of polarization beam apparatus exit end single-mode fiber；
5) two components of light of polarization beam apparatus outgoing at this time are equal, and since the path difference between two paths is more than
Or the generation equal to transmission light coherence time does not have between the generation distance for being less than the transmission optical superposition time, two light components
There is interference, just become non-polarized light after the two superposition.
In the above method, it is preferred that by one-component edge polarization in long-armed transmission polarization beam apparatus in the step 4)
The slow axis transmission of beam splitter exit end single-mode fiber, transmits one-component in polarization beam apparatus by galianconism and goes out along polarization beam apparatus
Penetrate the fast axle transmission of end single mode optical fiber.
In the above method, it is preferred that when the laser that the laser is sent is pulsed light, the described long-armed and brachium of galianconism
Difference is less than the generation distance of transmission light superimposed pulses time.
Compared with prior art, the present invention has following beneficial effect：
The depolarized system for polarised light and depolarized method of the present invention, polarization-maintaining beam splitter and rear end by front end
Polarization beam apparatus is formed, and is more than or equal to the generation distance of transmission light coherence time between two devices by two-way arm length difference
Polarization-maintaining beam splitter connects, and incident light directly can be divided into two beams that intensity is equal, polarization state is identical and is emitted by polarization-maintaining beam splitter
Light, may be such that the fusion point of optical fiber between two devices need not deflect 45 ° to axis, using 0 ° to axis, such two device it
Between optical fiber can be used to connect, in addition, the depolarized system is overlapped only with two-stage device, save substantial amounts of polarization-maintaining
Optical fiber, not only reduces the complexity of system, while reduces production cost.
Brief description of the drawings
Fig. 1 is a kind of functional block diagram of optics depolarizer of the prior art；
Fig. 2 is the functional block diagram for the depolarized system that the present invention is used for polarised light.
In figure：Polarization-maintaining beam splitter 100, polarization beam apparatus 200, the first polarization maintaining optical fibre 300, the second polarization maintaining optical fibre 400, the 3rd
Polarization maintaining optical fibre 500, the 4th polarization maintaining optical fibre 600, the 5th polarization maintaining optical fibre 700.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the present invention is clearly and completely described.
As shown in Figure 1, a kind of depolarized system for polarised light, including the polarization-maintaining beam splitter 100 of front end and rear end
Polarization beam apparatus 200, the polarization-maintaining beam splitter 100 are 3dB energy beam splitting, you can incident light is divided into intensity is equal, polarization
Two identical beam emergent lights of state, the incidence end of the polarization-maintaining beam splitter 100 are connected with the first polarization maintaining optical fibre 300, the polarization-maintaining point
The exit end of beam device 100 connects the second polarization maintaining optical fibre 400, the 3rd polarization maintaining optical fibre 500 respectively, and the polarization beam apparatus 200 enters
Penetrate end and be connected to the 4th polarization maintaining optical fibre 600 and the 5th polarization maintaining optical fibre 700, the exit end of the polarization beam apparatus 200 connects
Order mode fiber 800, second polarization maintaining optical fibre 400 are connected to form long-armed, the 3rd polarization-maintaining light with the 4th polarization maintaining optical fibre 600
Fibre 500 is connected to form galianconism with the 5th polarization maintaining optical fibre 700, for pulsed light, described long-armed and galianconism arm length difference be more than or
Generation distance equal to transmission light coherence time is less than the generation distance of transmission optical superposition time；And continuous light is directed to, the length
The arm length difference of arm and galianconism only needs to meet the generation distance more than or equal to transmission light coherence time.
Due to enter polarization-maintaining beam splitter 100 laser can 0 ° of incidence, it is equal, inclined to be divided into intensity by polarization-maintaining beam splitter 100
Two identical beam emergent lights of polarization state, the polarization maintaining optical fibre that the two beams emergent light passes through need not all deflect certain angle welding, institute
It can be used and be made into integration with the 4th polarization maintaining optical fibre 600 with second polarization maintaining optical fibre 400, same the 3rd polarization maintaining optical fibre
500 the step of also being made into integration with the 5th polarization maintaining optical fibre 700, save fused fiber splice, while avoid fusion point out-of-flatness
Harmful effect is moved towards to light.
In another embodiment, 400 and the 4th polarization maintaining optical fibre 600 of the second polarization maintaining optical fibre carries out 0 ° of welding, and described the
Three polarization maintaining optical fibres 500 and the 5th polarization maintaining optical fibre 700 carry out 0 ° of welding, and fused fiber splice process is：, will using Polarization Maintaining Optical Fiber Fusion Splicer
The polarization maintaining optical fibre of two outlets of polarization-maintaining beam splitter 100 carries out 0 ° with the two entrances polarization maintaining optical fibre of polarization beam apparatus 200 respectively
Welding, i.e. polarization maintaining optical fibre are directed at the slow axis welding of rear end.When laser is continuous light, it is necessary to ensure that the arm length difference L of two-arm is more than
The coherence length of laser, wherein laser center wavelength are λ, and line width is Δ λ, coherence length Lc=λ2/ Δ λ, i.e. L>Lc；If laser
I.e. Lc when being pulsed light<L<Ls, wherein Ls are the generation distances for transmitting the optical superposition time.
Depolarized effect：
The definition of degree of polarization DOP：
Wherein, Ix,IyThe respectively light light intensity of slow axis and fast axis component in a fiber, gxyRepresent the component on two optical axises
Between association.In depolarized system, 200 output terminal of polarization beam apparatus exports two components, is propagated respectively along fast axle and slow axis,
Since the two components are by 50:What 50 polarization-maintaining beam splitter separated, so the light intensity of the two components is equal, i.e. Ix=Iy.And
And the length difference between long galianconism is more than the coherence length of light, the degree of association is close to 0, i.e. g between two componentsxy≈0.Finally
Arrive：
I.e. degree of polarization has reached preferable depolarized effect close to 0.
The invention also discloses a kind of depolarized method of polarised light, comprise the following steps：
1) polarization-maintaining beam splitter of the laser for sending laser Jing Guo 3dB energy beam splitting is divided into that intensity is equal, polarization state phase
Two same beam emergent lights；
2) two-way emergent light is corresponded to along the second polarization maintaining optical fibre, the 4th polarization maintaining optical fibre and the 3rd polarization maintaining optical fibre, the respectively
The slow axis of five polarization maintaining optical fibres is propagated；
3) two-beam by galianconism with it is long-armed synthesize along respective slow axis into polarization beam apparatus it is a branch of, it is described long-armed and
The generation distance that the arm length difference of galianconism is more than or equal to transmission light coherence time is less than the generation distance for transmitting the optical superposition time；
4) one-component is transmitted along the slow axis of polarization beam apparatus exit end single-mode fiber in polarization beam apparatus, another point
Amount is transmitted along the fast axle of polarization beam apparatus exit end single-mode fiber；
5) two components of light of polarization beam apparatus outgoing at this time are equal, and since the path difference between two paths is more than
Or the generation equal to transmission light coherence time does not have between the generation distance for being less than the transmission optical superposition time, two light components
There is interference, just become non-polarized light after the two superposition.
In the above method, go out in the step 4) by one-component in long-armed transmission polarization beam apparatus along polarization beam apparatus
The slow axis transmission of end single mode optical fiber is penetrated, one-component is transmitted in polarization beam apparatus along polarization beam apparatus exit end single mode by galianconism
The fast axle transmission of optical fiber.
In the above method, when the laser that the laser is sent is pulsed light, the long-armed arm length difference with galianconism is less than
The generation distance of transmission pulse optical superposition time.
The structure of the comprehensive present invention understands with principle, the depolarized system for polarised light of the invention and depolarized method,
It is made of the polarization-maintaining beam splitter of front end and the polarization beam apparatus of rear end, is more than or waits by two-way arm length difference between two devices
In the polarization-maintaining beam splitter connection of the generation distance of transmission light coherence time, incident light can directly be divided into by force by polarization-maintaining beam splitter
Two beam emergent lights equal, that polarization state is identical are spent, may be such that the fusion point of optical fiber between two devices need not deflect 45 ° to axis,
Using 0 ° to axis, an optical fiber can be used to connect between such two device, in addition, the depolarized system is only with two
Level device overlap joint, saves substantial amounts of polarization maintaining optical fibre, not only reduces the complexity of system, while reduce production cost.
Claims (7)
- A kind of 1. depolarized system for polarised light, it is characterised in that the polarization of polarization-maintaining beam splitter and rear end including front end Beam splitter, the polarization-maintaining beam splitter are 3dB energy beam splitting, and the incidence end of the polarization-maintaining beam splitter is connected with the first polarization maintaining optical fibre, The exit end of the polarization-maintaining beam splitter connects the second polarization maintaining optical fibre, the 3rd polarization maintaining optical fibre, the incidence of the polarization beam apparatus respectively End is connected to the 4th polarization maintaining optical fibre and the 5th polarization maintaining optical fibre, and the exit end of the polarization beam apparatus connects single mode optical fiber, Second polarization maintaining optical fibre is connected with the 4th polarization maintaining optical fibre to be formed long-armed, and the 3rd polarization maintaining optical fibre is connected with the 5th polarization maintaining optical fibre Form galianconism, the long-armed generation distance for being more than transmission light coherence time with the arm length difference of galianconism.
- 2. it is used for the depolarized system of polarised light as claimed in claim 1, it is characterised in that the described long-armed and arm length difference of galianconism Distance is produced more than transmission light coherence time and less than the generation distance of transmission optical superposition time.
- 3. it is used for the depolarized system of polarised light as claimed in claim 1, it is characterised in that second polarization maintaining optical fibre and the 4th Polarization maintaining optical fibre, which is integrated, to be made, and the 3rd polarization maintaining optical fibre is integrated with the 5th polarization maintaining optical fibre to be made.
- 4. it is used for the depolarized system of polarised light as claimed in claim 1, it is characterised in that second polarization maintaining optical fibre and the 4th Polarization maintaining optical fibre carries out 0 ° of welding, and the 3rd polarization maintaining optical fibre and the 5th polarization maintaining optical fibre carry out 0 ° of welding.
- A kind of 5. depolarized method of polarised light, it is characterised in that comprise the following steps：1) polarization-maintaining beam splitter of the laser for sending laser Jing Guo 3dB energy beam splitting is divided into that intensity is equal, polarization state is identical Two beam emergent lights；2) two-way emergent light corresponds to respectively protects along the second polarization maintaining optical fibre, the 4th polarization maintaining optical fibre and the 3rd polarization maintaining optical fibre, the 5th The slow axis of polarisation fibre is propagated；3) two-beam synthesizes a branch of, described long-armed and galianconism along respective slow axis into polarization beam apparatus by galianconism with long-armed Arm length difference be more than or equal to transmission light coherence time generation distance be less than transmission the optical superposition time generation distance；4) one-component is transmitted along the slow axis of polarization beam apparatus exit end single-mode fiber in polarization beam apparatus, another component edge The fast axle transmission of polarization beam apparatus exit end single-mode fiber；5) two components of light of polarization beam apparatus outgoing at this time are equal, and be more than due to the path difference between two paths or It is no between two light components to do equal to the generation distance for producing distance and being less than the transmission optical superposition time of transmission light coherence time Relate to, just become non-polarized light after the two superposition.
- 6. the depolarized method of polarised light as claimed in claim 5, it is characterised in that polarized in the step 4) by long-armed transmission One-component is transmitted along the slow axis of polarization beam apparatus exit end single-mode fiber in beam splitter, is transmitted by galianconism in polarization beam apparatus One-component is transmitted along the fast axle of polarization beam apparatus exit end single-mode fiber.
- 7. the depolarized method of polarised light as claimed in claim 5, it is characterised in that the laser that the laser is sent is pulsed light When, the long-armed generation distance for being less than the transmission light superimposed pulses time with the arm length difference of galianconism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810026762.7A CN107966764A (en) | 2018-01-11 | 2018-01-11 | A kind of depolarized system for polarised light and depolarized method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810026762.7A CN107966764A (en) | 2018-01-11 | 2018-01-11 | A kind of depolarized system for polarised light and depolarized method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266458B1 (en) * | 1998-11-24 | 2001-07-24 | Electronics And Telecommunications Research Institute | Tunable optical filtering system using fiber-optic polarimetric interferometer |
| EP1241499A1 (en) * | 2001-03-13 | 2002-09-18 | JDS Uniphase Inc. | Laser with depolariser |
| US20030063833A1 (en) * | 2001-09-28 | 2003-04-03 | Francois Gonthier | All-fiber depolarizer |
| CN102221729A (en) * | 2011-07-05 | 2011-10-19 | 珠海保税区光联通讯技术有限公司 | Optics depolarizer |
| CN102279444A (en) * | 2011-07-26 | 2011-12-14 | 南京大学 | Passive device for eliminating polarization noise in Brillouin optical fiber sensor |
| CN103645544A (en) * | 2013-12-25 | 2014-03-19 | 光库通讯(珠海)有限公司 | Optical depolarizer |
| CN207764414U (en) * | 2018-01-11 | 2018-08-24 | 浙江九州量子信息技术股份有限公司 | A kind of depolarized system for polarised light |
-
2018
- 2018-01-11 CN CN201810026762.7A patent/CN107966764A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266458B1 (en) * | 1998-11-24 | 2001-07-24 | Electronics And Telecommunications Research Institute | Tunable optical filtering system using fiber-optic polarimetric interferometer |
| EP1241499A1 (en) * | 2001-03-13 | 2002-09-18 | JDS Uniphase Inc. | Laser with depolariser |
| US20030063833A1 (en) * | 2001-09-28 | 2003-04-03 | Francois Gonthier | All-fiber depolarizer |
| CN102221729A (en) * | 2011-07-05 | 2011-10-19 | 珠海保税区光联通讯技术有限公司 | Optics depolarizer |
| CN102279444A (en) * | 2011-07-26 | 2011-12-14 | 南京大学 | Passive device for eliminating polarization noise in Brillouin optical fiber sensor |
| CN103645544A (en) * | 2013-12-25 | 2014-03-19 | 光库通讯(珠海)有限公司 | Optical depolarizer |
| CN207764414U (en) * | 2018-01-11 | 2018-08-24 | 浙江九州量子信息技术股份有限公司 | A kind of depolarized system for polarised light |
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