CN108696330B - Mode conversion method, mode converter, electronic equipment and readable storage medium storing program for executing - Google Patents
Mode conversion method, mode converter, electronic equipment and readable storage medium storing program for executing Download PDFInfo
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- CN108696330B CN108696330B CN201810360735.3A CN201810360735A CN108696330B CN 108696330 B CN108696330 B CN 108696330B CN 201810360735 A CN201810360735 A CN 201810360735A CN 108696330 B CN108696330 B CN 108696330B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
Abstract
The embodiment of the invention provides one mode conversion method, mode converter, electronic equipment and readable storage medium storing program for executing, applied to optical-fiber network technical field, the described method includes: obtaining the basic mode in different polarization direction, the basic mode in different polarization direction is converted to by the LP that mode direction is identical but polarization direction is different by modeling coupler11Mode；By polarization mode controller by mode direction is identical but polarization direction is different LP11Mode is converted to different single order modes；The first polarization direction of different single order modes is filtered out respectively by the polarizer, retains the second polarization direction of different single order modes, obtains the different LP in mode direction11Mode.The present invention can be by the LP in different polarization direction01Mode is converted to the LP in different mode direction11Mode, and the direction of energy High-speed Control mode.
Description
Technical field
The present invention relates to optical-fiber network technical fields, set more particularly to one mode conversion method, mode converter, electronics
Standby and readable storage medium storing program for executing.
Background technique
In optical-fiber network technology, in order to keep up with ever-increasing data traffic, researcher explore and attempt to optimize the time,
The multiplexing of wavelength and polarization.In recent years, SDM (Space Division Multiplexing, space division multiplexing) is suggested, and
SDM is considered as the new way for improving optical network data capacity, and SDM includes the space division multiplexing of multi-core optical fiber and the mould of less fundamental mode optical fibre
Divide multiplexing.For the mixed optical network of the following high flexible, all dimensions (palarization multiplexing, wavelength multiplexing, time-multiplexed and mould
Formula multiplexing etc.) all it is expected to coexist in the same network, bumpless transfer is needed between them, to realize high capacity transmission and high grain
Spend channel control.WDM (Wavelength Division Multiplexing, wavelength-division multiplex) and OTDM (Optical Time
Division Multiplexing, Optical Time Division Multiplexing) between and the conversion between SDM and WDM be suggested.
Currently, proposed on silica-based waveguides device PDM (Polarization Division Multiplexing,
Palarization multiplexing) to the application of MDM (Model Division Multiplexing, mode multiplexing), but in a fiber without real
The conversion of existing PDM to MDM.For the Polarization Control mode of silicon substrate, the insertion loss of system itself is at least 6dB, and silicon substrate
In mode and optical fiber in model shape it is different, will further increase insertion loss.In addition, the system can only be by two lines
The basic mode of polarization is respectively converted into basic mode group and single order model group, can only achieve the multiplexing of model group, cannot reach Polarization Control
The multiplexing of same model group degenerate mode, i.e., cannot be by the LP of different linear polarizations01It is different that mode is converted to mode direction
LP11Mode.
Summary of the invention
The embodiment of the present invention is designed to provide one mode conversion method, mode converter, electronic equipment and readable
Storage medium to realize the conversion of PDM to MDM in a fiber, and passes through the multiplexing of the same model group degenerate mode of Polarization Control.
Specific technical solution is as follows:
The embodiment of the invention provides one mode conversion methods, which comprises
The basic mode for obtaining different polarization direction, is converted to mould for the basic mode in the different polarization direction by modeling coupler
The LP that formula direction is identical but polarization direction is different11Mode；
By polarization mode controller by the mode direction is identical but polarization direction is different LP11Mode is converted to difference
Single order mode；
The first polarization direction of the different single order mode is filtered out respectively by the polarizer, retains described different one
Second polarization direction of rank mode obtains the different LP in mode direction11Mode.
Optionally, it is described by polarization mode controller by the mode direction is identical but polarization direction is different LP11Mould
Formula is converted to different single order modes, comprising:
By changing in polarization mode controller one in the angle and polarization mode controller of paddle plane and horizontal direction
Phase difference between four substrates of rank mode, by the LP that the mode direction is identical but polarization direction is different11Mode is converted to
Different single order modes.
Optionally, change the mode of the phase difference between four substrates of single order mode in the polarization mode controller,
Include:
Less fundamental mode optical fibre is wrapped on the paddle of Polarization Controller, four single order mode substrates are generated, it is described few by changing
The circle number that mode fiber is wound on the paddle of the Polarization Controller changes four of single order mode in the polarization mode controller
Phase difference between substrate；
Wherein, the phase difference in polarization mode controller between any two single order mode substrate is L=2 π RN, N are the circle numbers that less fundamental mode optical fibre is wound on the paddle of the Polarization Controller, and Δ n is corresponding two
Effective refractive index between a substrate is poor, and R is the bending radius of the paddle of the Polarization Controller.
Optionally, the angle and polarization mode by changing paddle plane and horizontal direction in polarization mode controller
Phase difference in formula controller between four substrates of single order mode is identical by the mode direction but polarization direction is different
LP11Mode is converted to different single order modes, comprising:
If paddle plane rotates angle [alpha], the polarization mode controller from horizontal direction in the polarization mode controller
Rotation alpha degree is distinguished in the mode direction of middle substrate and polarization direction；
If the substrate LP of the less fundamental mode optical fibre11AXMode direction and polarization direction be horizontal direction, few mould light
Fine substrate LP11BXMode direction and polarization direction be respectively vertically and horizontally, the substrate of the less fundamental mode optical fibre
LP11AYMode direction and polarization direction be respectively horizontal direction and vertical direction, the substrate LP of the less fundamental mode optical fibre11BYMould
Formula direction and polarization direction are vertical direction, by the substrate LP of the less fundamental mode optical fibre11AX、LP11BX、LP11AYAnd LP11BYRotation
To the substrate lp of the polarization mode controller11ax、lp11bx、lp11ayAnd lp11byTransition matrix R (α) indicate are as follows:
If the phase that the different mode in the identical polarization direction in the mode direction generates in the polarization mode controller
Delay matrix Indicate lp11axAnd lp11byPhase
Difference,Indicate lp11bxAnd lp11byPhase difference,Indicate lp11ayAnd lp11byPhase difference；lp11ax、
lp11bx、lp11ayAnd lp11byFor the substrate of single order mode in the polarization mode controller, and lp11axMode direction and polarization
Direction is parallel with the normal direction of the paddle of polarization mode controller, lp11bxMode direction and polarization direction respectively with polarization
The normal direction of the paddle of mode controller is parallel with tangential direction, lp11ayMode direction and polarization direction respectively with polarization mode
The tangential direction of the paddle of formula controller is parallel with normal direction, lp11byMode direction and polarization direction with polarization mode control
The tangential direction of the paddle of device processed is parallel；
As the LP that the mode direction is identical but polarization direction is different11After mode passes through the polarization mode controller, institute
State the substrate of polarization mode controller to the less fundamental mode optical fibre substrate inverse conversion matrix
If the single order mode in less fundamental mode optical fibre is the combination of four orthogonal modes, any single order mode E=in optical fiber
EAX|LP11AX>+EBX|LP11BX>+EAY|LP11AY>+EBY|LP11BY>, EAXFor LP11AXThe amplitude of mode, EBXFor LP11BXMode
Amplitude, EAYFor LP11AYThe amplitude of mode, EBYFor LP11BYThe amplitude of mode；
F (r) is the solution of first-order bessel function, r andIt is radially and angularly coordinate,WithFor the direction of polarization, difference
It is aligned with horizontal and vertical direction；
The mode in the less fundamental mode optical fibre is expressed as by Jones matrixThe then polarization mode controller
Mode Eoutput=R' × T × R × E of output.
Optionally, if the mode direction of input pattern E is horizontal and polarization is linear, and the angle of polarization and x-axis angle
For θ, thenIf α=45 °,Then
Optionally, described respectively to be filtered out the first polarization direction of the different single order mode by the polarizer, retain
Second polarization direction of the different single order mode, obtains the different LP in mode direction11Mode, comprising:
If the first polarization direction is the direction y, the second polarization direction is the direction x, and different single order modes is in x-polarisation direction
Mode intensity is Wherein, the rotation angle and input line of mode
Polarization angle is linear relationship, and the two differs
Optionally, the basic mode in the different polarization direction is by electronic Polarization Controller to the light obtained from laser light source
Set what different polarization directions obtained.
The embodiment of the invention provides one mode converter, the mode converter includes:
Modeling coupler is converted to the basic mode in the different polarization direction for obtaining the basic mode in different polarization direction
The LP that mode direction is identical but polarization direction is different11Mode；
Polarization mode controller, for by the mode direction is identical but polarization direction is different LP11Mode is converted to not
Same single order mode；
The polarizer retains described different for respectively filtering out the first polarization direction of the different single order mode
Second polarization direction of single order mode obtains the different LP in mode direction11Mode.
Optionally, the polarization mode controller is specifically used for, by changing paddle plane in the polarization mode controller
With the phase difference in the angle and the polarization mode controller of horizontal direction between four substrates of single order mode, by institute
State the LP that mode direction is identical but polarization direction is different11Mode is converted to different single order modes.
Optionally, the polarization mode controller includes:
Less fundamental mode optical fibre generates four single order mode substrates, by changing few mould for winding the paddle of Polarization Controller
The circle number that optical fiber is wound on the paddle of the Polarization Controller changes four bases of single order mode in the polarization mode controller
Phase difference between bottom；
Wherein, the phase difference in polarization mode controller between any two single order mode substrate is L=2 π RN, N are the circle numbers that less fundamental mode optical fibre is wound on the paddle of the Polarization Controller, and Δ n is corresponding two
Effective refractive index between a substrate is poor, and R is the bending radius of the paddle of the Polarization Controller.
Optionally, the polarization mode controller is specifically used for, if paddle plane is from level in the polarization mode controller
Direction rotates angle [alpha], then rotation alpha degree is distinguished in the mode direction and polarization direction of substrate in the polarization mode controller；
If the substrate LP of the less fundamental mode optical fibre11AXMode direction and polarization direction be horizontal direction, few mould light
Fine substrate LP11BXMode direction and polarization direction be respectively vertically and horizontally, the substrate of the less fundamental mode optical fibre
LP11AYMode direction and polarization direction be respectively horizontal direction and vertical direction, the substrate LP of the less fundamental mode optical fibre11BYMould
Formula direction and polarization direction are vertical direction, by the substrate LP of the less fundamental mode optical fibre11AX、LP11BX、LP11AYAnd LP11BYRotation
To the substrate lp of the polarization mode controller11ax、lp11bx、lp11ayAnd lp11byTransition matrix R (α) indicate are as follows:
If the phase that the different mode in the identical polarization direction in the mode direction generates in the polarization mode controller
Delay matrix Indicate lp11axAnd lp11byPhase
Difference,Indicate lp11bxAnd lp11byPhase difference,Indicate lp11ayAnd lp11byPhase difference；lp11ax、
lp11bx、lp11ayAnd lp11byFor the substrate of single order mode in the polarization mode controller, and lp11axMode direction and polarization
Direction is parallel with the normal direction of the paddle of polarization mode controller, lp11bxMode direction and polarization direction respectively with polarization
The normal direction of the paddle of mode controller is parallel with tangential direction, lp11ayMode direction and polarization direction respectively with polarization mode
The tangential direction of the paddle of formula controller is parallel with normal direction, lp11byMode direction and polarization direction with polarization mode control
The tangential direction of the paddle of device processed is parallel；
As the LP that the mode direction is identical but polarization direction is different11After mode passes through the polarization mode controller, institute
State the substrate of polarization mode controller to the less fundamental mode optical fibre substrate inverse conversion matrix
If the single order mode in less fundamental mode optical fibre is the combination of four orthogonal modes, any single order mode E=in optical fiber
EAX|LP11AX>+EBX|LP11BX>+EAY|LP11AY>+EBY|LP11BY>, EAXFor LP11AXThe amplitude of mode, EBXFor LP11BXThe vibration of mode
Width, EAYFor LP11AYThe amplitude of mode, EBYFor LP11BYThe amplitude of mode；
F (r) is the solution of first-order bessel function, r andIt is radially and angularly coordinate,WithFor the direction of polarization, difference
It is aligned with horizontal and vertical direction；
The mode in the less fundamental mode optical fibre is expressed as by Jones matrixThe then polarization mode controller
Mode Eoutput=R' × T × R × E of output.
Optionally, in the mode converter of the embodiment of the present invention, if the mode direction of input pattern E is horizontal and polarizes
It is linear, and the angle of polarization and x-axis angle are θ, thenIf α=45 °,Then
Optionally, the polarizer is specifically used for, if the first polarization direction is the direction y, the second polarization direction is the direction x,
Mode intensity of the different single order modes in x-polarisation direction be
Wherein, the rotation angle of mode and input line polarization angle are linear relationships, and the two differs
Optionally, the basic mode in the different polarization direction is by electronic Polarization Controller to the light obtained from laser light source
Set what different polarization directions obtained.
The embodiment of the invention provides a kind of electronic equipment, comprising: processor, communication interface, memory and communication bus,
Wherein, the processor, the communication interface, the memory complete mutual communication by the communication bus；
The memory, for storing computer program；
The processor when for executing the program stored on the memory, realizes any of the above-described mode
The step of conversion method.
The embodiment of the invention provides a kind of computer readable storage medium, storage in the computer readable storage medium
There is computer program, when the computer program is executed by processor, realizes the step of any of the above-described mode conversion method
Suddenly.
Mode conversion method, mode converter, electronic equipment and readable storage medium storing program for executing provided in an embodiment of the present invention, pass through
Obtain different polarization direction basic mode, by modeling coupler by the basic mode in different polarization direction be converted to mode direction it is identical but
The different LP in polarization direction11Mode；By polarization mode controller by mode direction is identical but polarization direction is different LP11Mould
Formula is converted to different single order modes；The first polarization direction of different single order modes is filtered out respectively by the polarizer, is retained
Second polarization direction of different single order modes obtains the different LP in mode direction11Mode.The present invention can be by mode direction phase
Same but different polarization direction LP11Mode is converted to the different LP in mode direction11Mode, and the side of energy High-speed Control mode
To.Certainly, it implements any of the products of the present invention or method does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of the mode conversion method of the embodiment of the present invention；
Fig. 2 is refringence in the embodiment of the present invention with the curve graph of wavelength change；
Fig. 3 is phase difference in the embodiment of the present invention with the curve graph of wavelength change；
Fig. 4 is the mode substrate schematic diagram in the embodiment of the present invention in less fundamental mode optical fibre；
Fig. 5 is the mode substrate schematic diagram in the embodiment of the present invention in polarization mode controller；
Fig. 6 is conversion process of the substrate in the embodiment of the present invention in less fundamental mode optical fibre to the substrate in polarization mode controller
Schematic diagram；
Fig. 7 is polarization mode controller output mode in the embodiment of the present invention, obtains the mould in x-polarisation direction by the polarizer
The phase distribution of formula and x-polarisation mode is respectively with the change curve of the linear polarization angle change of input；
Fig. 8 is the simulation result and comparison of test results figure of the x-polarisation direction mode of the embodiment of the present invention；
Fig. 9 is the structure chart of the mode converter of the embodiment of the present invention；
Figure 10 is the structure chart of the electronic equipment of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides one mode conversion method, mode converter, electronic equipment and readable storage medium storing program for executing,
The conversion of PDM to MDM can be realized in a fiber, and passes through the multiplexing of the same model group degenerate mode of Polarization Control.
Mode conversion method is provided for the embodiments of the invention first below to describe in detail.
It is the flow chart of the mode conversion method of the embodiment of the present invention referring to Fig. 1, Fig. 1, comprising the following steps:
S101 obtains the basic mode in different polarization direction, is converted to the basic mode in different polarization direction by modeling coupler
The LP that mode direction is identical but polarization direction is different11Mode.
In common FMF (few-mode fiber, less fundamental mode optical fibre), it is divided into symmetrically according to the spatial asymmetry of mode
Mode and asymmetric mode.LP01 mode is basic mode, and LP01 mode may be considered the concept that symmetric pattern does not have mode direction,
But basic mode can be there are many different polarization directions.LP11 mode is one of single order mode, and LP11 mode can consider
It is asymmetric mode, the mode direction of asymmetric mould is the line direction of two opposite valves, and two valve phase differences are π.
In the embodiment of the present invention, electronic Polarization Controller can control the polarization of basic mode in optical fiber, therefore, different polarization side
To basic mode can be and obtained by the electronic Polarization Controller polarization direction different to the light settings obtained from laser light source,
And laser light source can be Wavelength tunable section.The basic mode in different polarization direction can be converted to mode side by modeling coupler
To identical but different polarization direction LP11Mode.
S102, by polarization mode controller by mode direction is identical but polarization direction is different LP11Mode is converted to not
Same single order mode.
In the embodiment of the present invention, less fundamental mode optical fibre can be wrapped on the paddle of Polarization Controller and be controlled as polarization mode
Device.It, can be by mode direction is identical but polarization direction is different LP by being configured to polarization mode controller11Mode conversion
For arbitrary single order mode.Single order mode is including LP11 mode, OAM (Orbital Angular momentum) mode
With some oval intermediate states etc..
First polarization direction of different single order modes is filtered out respectively by the polarizer, retains different single orders by S103
Second polarization direction of mode obtains the different LP in mode direction11Mode.
The polarizer is the device for obtaining polarised light, and therefore, the polarizer can be by the first of different single order modes partially
Vibration direction filters out, and retains the second polarization direction of different single order modes, obtains the different LP in mode direction11Mode.Wherein, when
When first polarization direction is the direction y, the second polarization direction is the direction x；When the first polarization direction is the direction x, the second polarization side
To for the direction y.
Mode conversion method provided in an embodiment of the present invention passes through modeling coupling by obtaining the basic mode in different polarization direction
The basic mode in different polarization direction is converted to the LP that mode direction is identical but polarization direction is different by clutch11Mode；Pass through polarization mode
Formula controller is by the LP that mode direction is identical but polarization direction is different11Mode is converted to different single order modes；Pass through the polarizer
The first polarization direction of different single order modes is filtered out respectively, retains the second polarization direction of different single order modes, obtains
The different LP in mode direction11Mode.The present invention can be by the LP in different polarization direction01Mode is converted to different mode direction
LP11Mode, and the direction of energy High-speed Control mode.
In a kind of implementation of the invention, in Fig. 1 embodiment S102, by polarization mode controller by mode direction phase
Same but different polarization direction LP11Mode is converted to different single order modes, comprising:
By changing in polarization mode controller one in the angle and polarization mode controller of paddle plane and horizontal direction
Phase difference between four substrates of rank mode, by the LP that mode direction is identical but polarization direction is different11Mode is converted to difference
Single order mode.
In the embodiment of the present invention, paddle plane and level in polarization mode controller are changed by the paddle of rotatory polarization controller
The asymmetric mould of single order based on the basic mode control different angle in different polarization direction in less fundamental mode optical fibre may be implemented in the angle in direction
Formula.Also, any single order mode can be expressed as the combination of four orthogonal modes (i.e. four substrates), and less fundamental mode optical fibre is wrapped in
On the paddle of Polarization Controller, four single order mode substrates are generated, are wound on the paddle of Polarization Controller by changing less fundamental mode optical fibre
Circle number, thus it is possible to vary the phase difference in polarization mode controller between four substrates of single order mode, realize to single order mode
Phase difference control.
For example, if lp11ax、lp11bx、lp11ayAnd lp11byFor the substrate of single order mode in polarization mode controller, and lp11ax
Mode direction and polarization direction it is parallel with the normal direction of the paddle of polarization mode controller, lp11bxMode direction and partially
Vibration direction is parallel with the normal direction of the paddle of polarization mode controller and tangential direction respectively, lp11ayMode direction and polarization
Direction is parallel with the tangential direction of the paddle of polarization mode controller and normal direction respectively, lp11byMode direction and polarization side
The tangential direction of the paddle of Xiang Junyu polarization mode controller is parallel.When the paddle of Polarization Controller rotates, it will change
The mode direction of substrate and polarization direction, the tangential direction of the paddle of polarization mode controller in the plane of paddle, can pass through always
Adjustment paddle comes the direction of adjustment modes direction and polarization.When the paddle plane and horizontal direction at α angle of polarization mode controller, base
The mode direction at bottom and polarization direction and horizontal direction are also in the angle α.
If less fundamental mode optical fibre is two mode fibers, two mode fibers are wrapped in the Polarization Controller that radius of curvature R is 28.5mm
Polarization mode controller is used as on paddle.When the bending of two mode fibers, it will cause in the substrate of polarization mode controller double
Refraction effect, i.e., it is poor with certain effective refractive index between four substrates.Referring to fig. 2, Fig. 2 is to roll in the embodiment of the present invention
Rate difference is penetrated with the curve graph of wavelength change, specially lp11ax、lp11bx、lp11ayRespectively with lp11byBetween refringence, Δ
naxbyFor lp11axWith lp11byBetween refringence, Δ nbxbyFor lp11bxWith lp11byBetween refringence, Δ naybyFor
lp11ayWith lp11byBetween refringence.
In the embodiment of the present invention, pass throughThe phase difference between mode can be calculated,For polarization mode
Phase difference in controller between any two single order mode substrate, L=2 π RN, N are paddle of the less fundamental mode optical fibre in Polarization Controller
The circle number of upper winding, effective refractive index of the Δ n between corresponding two substrates is poor, and R is the bending half of the paddle of Polarization Controller
Diameter.Referring to Fig. 3, Fig. 3 is that phase difference twines on paddle with the curve graph of wavelength change, specially two mode fibers in the embodiment of the present invention
Around 6 circle when phase difference with wavelength change curve graph.Indicate lp11axAnd lp11byPhase difference,It indicates
lp11bxAnd lp11byPhase difference,Indicate lp11ayAnd lp11byPhase difference.The circle number that two mode fibers are wound on paddle
It can change, be found by experiment that, the phase difference that two mode fibers are obtained in 6 circle of winding on paddle is needed for theoretical calculation
Phase difference.After the determining circle number wound on paddle is 6,3 circles two can be wound on paddle before the paddle and later
Mode fiber, in this way, the control of mode direction and polarization direction can be carried out, also, before and after 3 two mode fibers of circle on paddle
The phase delay that can be generated with the tail optical fiber of compensating polarizing mode controller.
In a kind of implementation of the invention, by the folder for changing paddle plane and horizontal direction in polarization mode controller
Phase difference in angle and polarization mode controller between four substrates of single order mode, by mode direction is identical but polarization side
To different LP11Mode is converted to different single order modes, comprising:
If paddle plane rotates angle [alpha] from horizontal direction in polarization mode controller, substrate in polarization mode controller
Rotation alpha degree is distinguished in mode direction and polarization direction.
If the substrate LP of less fundamental mode optical fibre11AXMode direction and polarization direction be horizontal direction, the substrate of less fundamental mode optical fibre
LP11BXMode direction and polarization direction be respectively vertically and horizontally, the substrate LP of less fundamental mode optical fibre11AYMode side
To being respectively horizontal direction and vertical direction, the substrate LP of less fundamental mode optical fibre with polarization direction11BYMode direction and polarization direction
It is vertical direction.Referring to fig. 4, Fig. 4 is the mode substrate schematic diagram in the embodiment of the present invention in less fundamental mode optical fibre, EAXFor LP11AX
The amplitude of mode, EBXFor LP11BXThe amplitude of mode, EAYFor LP11AYThe amplitude of mode, EBYFor LP11BYThe amplitude of mode.lp11ax、
lp11bx、lp11ayAnd lp11byFor the substrate of single order mode in polarization mode controller, and lp11axMode direction and polarization direction
It is parallel with the normal direction of the paddle of polarization mode controller, lp11bxMode direction and polarization direction respectively with polarization mode
The normal direction of the paddle of controller is parallel with tangential direction, lp11ayMode direction and polarization direction respectively with polarization mode control
The tangential direction of the paddle of device processed is parallel with normal direction, lp11byMode direction and polarization direction with polarization mode controller
Paddle tangential direction it is parallel.Referring to the mode substrate signal that Fig. 5, Fig. 5 are in the embodiment of the present invention in polarization mode controller
Figure.lp11axInitial phaselp11bxInitial phaselp11ayInitial phase
lp11byInitial phaseAfter by polarization mode controller, in the mode substrate in polarization mode controller
Phase will change, lp11axPhaselp11bxPhaselp11ayPhase
lp11byPhaseIt can be seen that lp11bxPhase changed.
By the substrate LP of less fundamental mode optical fibre11AX、LP11BX、LP11AYAnd LP11BYIt rotates to the substrate of polarization mode controller
lp11ax、lp11bx、lp11ayAnd lp11by, which can regard that the mode substrate of less fundamental mode optical fibre rotates clockwise α degree as,
Spin matrix can be expressed as R (α).With LP11AXRotate to lp11axFor be illustrated, first will polarize rotation alpha degree, twiddle factor
It is cos α, obtains LP11ax, mode rotation alpha degree is carried out later, and same twiddle factor is cos α.In this way from LP11AXIt converts to 1p11ax
The factor be cos α cos α.The conversion process of substrate to the substrate in polarization mode controller in less fundamental mode optical fibre can be found in Fig. 6,
The conversion of other substrates is similar, and this will not be detailed here.
So, the transition matrix R (α) obtained is indicated are as follows:
In the embodiment of the present invention, the different mode in the identical polarization direction in mode direction by polarization mode controller it
Afterwards, it will generate phase delay.If the different mode in the identical polarization direction in mode direction generates in polarization mode controller
Phase delay is expressed as phase delay matrix T,
Then Indicate lp11axAnd lp11byPhase
Difference,Indicate lp11bxAnd lp11byPhase difference,Indicate lp11ayAnd lp11byPhase difference.
As the LP that mode direction is identical but polarization direction is different11After mode passes through polarization mode controller, by polarization mode
The substrate of controller goes back to the substrate of less fundamental mode optical fibre, and the substrate which can be regarded as polarization mode controller is counterclockwise
Rotation alpha degree, then, the inverse conversion matrix of the substrate of the substrate of polarization mode controller to less fundamental mode optical fibre
If the single order mode in less fundamental mode optical fibre is the combination of four orthogonal modes, any single order mode E=in optical fiber
EAX|LP11AX>+EBX|LP11BX>+EAY|LP11AY>+EBY|LP11BY>, EAXFor LP11AXThe amplitude of mode, EBXFor LP11BXThe vibration of mode
Width, EAYFor LP11AYThe amplitude of mode, EBYFor LP11BYThe amplitude of mode；
F (r) is the solution of first-order bessel function, r andIt is radially and angularly coordinate,WithFor the direction of polarization, difference
It is aligned with horizontal and vertical direction；
The mode in less fundamental mode optical fibre is expressed as by Jones matrixThe then mould of polarization mode controller output
Formula Eoutput=R' × T × R × E.
In a kind of implementation of the invention, if the mode direction of input pattern E is horizontal and polarization is linear, and
The angle of polarization and x-axis angle are θ, thenIf α=45 °,
It can then be obtained by above-mentioned formula Eoutput=R' × T × R × E
If the first polarization direction is the direction y, the second polarization direction is the direction x, and different single order modes is in x-polarisation direction
Mode beIn the upper surface of two elements, it is available:
Wherein, the rotation angle of mode and input line polarization angle are linear relationships, and two
Person's difference
In the embodiment of the present invention, according to Eoutput=R' × T × R × E, it can be deduced that, when α=45 °,When, the different LP in available mode direction11Mode.Pass through few mould
The light of optical fiber output is expanded using lens, by the polarizer after expanding, by CCD (Charge-coupled Device,
Charge coupled cell) record pattern, the intensity distribution of mode can be obtained.Change input pattern by polarization mode controller
Linear polarization angle obtains the LP in different mode direction11Mode.Polarization mode controller output mode, to obtain x by the polarizer inclined
The mode in vibration direction and the phase distribution of x-polarisation mode are respectively as the variation of the linear polarization angle change of input can be found in figure
7, as 360 ° of variations occur for the linear polarization angle of input, 360 ° of rotation also occurs for the mode figure in x-polarisation direction.Referring to figure
8, Fig. 8 be the simulation result and comparison of test results figure of the x-polarisation direction mode of the embodiment of the present invention, it can be seen that x-polarisation side
It matches to the simulation result and test result of mode.
In the embodiment of the present invention, if polarization mode controller to be changed into commercial light polarization modulator, the speed of mode is generated
Degree can achieve GHZ.The present invention can be matched with optical fiber telecommunications system, can to avoid insertion loss, and can at high speed into
Row conversion, so as to effectively improve the performance of communication system.
Corresponding to above method embodiment, it to be this referring to Fig. 9, Fig. 9 that the embodiment of the invention provides one mode converters
The structure chart of the mode converter of inventive embodiments, comprising:
The basic mode in different polarization direction is converted to mould for obtaining the basic mode in different polarization direction by modeling coupler 901
The LP that formula direction is identical but polarization direction is different11Mode；
Polarization mode controller 902, for by mode direction is identical but polarization direction is different LP11Mode is converted to difference
Single order mode；
The polarizer 903 retains different First-Order Modes for respectively filtering out the first polarization direction of different single order modes
Second polarization direction of formula obtains the different LP in mode direction11Mode.
The mode converter of the embodiment of the present invention, obtain different polarization direction basic mode after, pass through modeling coupler will
The basic mode in different polarization direction is converted to the LP that mode direction is identical but polarization direction is different11Mode；It is controlled by polarization mode
Device is by the LP that mode direction is identical but polarization direction is different11Mode is converted to different single order modes；Respectively will by the polarizer
First polarization direction of different single order modes filters out, and retains the second polarization direction of different single order modes, obtains mode side
To different LP11Mode.The present invention can be by the LP in different polarization direction01Mode is converted to the LP in different mode direction11Mould
Formula, and the direction of energy High-speed Control mode.
Optionally, polarization mode controller is specifically used for, by changing paddle plane and level side in polarization mode controller
To angle and polarization mode controller in single order mode four substrates between phase difference, by mode direction it is identical but
The different LP in polarization direction11Mode is converted to different single order modes.
Optionally, polarization mode controller includes:
Less fundamental mode optical fibre generates four single order mode substrates, by changing less fundamental mode optical fibre for winding the paddle of Polarization Controller
The circle number wound on the paddle of Polarization Controller changes the phase in polarization mode controller between four substrates of single order mode
Difference；
Wherein, the phase difference in polarization mode controller between any two single order mode substrate is L=2 π RN, N are the circle numbers that less fundamental mode optical fibre is wound on the paddle of Polarization Controller, and Δ n is corresponding two bases
Effective refractive index between bottom is poor, and R is the bending radius of the paddle of Polarization Controller.
Optionally, polarization mode controller is specifically used for, if paddle plane rotates from horizontal direction in polarization mode controller
Angle [alpha], then rotation alpha degree is distinguished in the mode direction and polarization direction of substrate in polarization mode controller；
If the substrate LP of less fundamental mode optical fibre11AXMode direction and polarization direction be horizontal direction, the substrate of less fundamental mode optical fibre
LP11BXMode direction and polarization direction be respectively vertically and horizontally, the substrate LP of less fundamental mode optical fibre11AYMode side
To being respectively horizontal direction and vertical direction, the substrate LP of less fundamental mode optical fibre with polarization direction11BYMode direction and polarization direction
It is vertical direction, by the substrate LP of less fundamental mode optical fibre11AX、LP11BX、LP11AYAnd LP11BYIt rotates to the base of polarization mode controller
Bottom lp11ax、lp11bx、lp11ayAnd lp11byTransition matrix R (α) indicate are as follows:
If the phase delay matrix that the different mode in the identical polarization direction in mode direction generates in polarization mode controller Indicate lp11axAnd lp11byPhase difference,Indicate lp11bxAnd lp11byPhase difference,Indicate lp11ayAnd lp11byPhase difference；lp11ax、lp11bx、
lp11ayAnd lp11byFor the substrate of single order mode in polarization mode controller, and lp11axMode direction and polarization direction and partially
The normal direction of the paddle of vibration mode controller is parallel, lp11bxMode direction and polarization direction respectively with polarization mode controller
Paddle normal direction it is parallel with tangential direction, lp11ayMode direction and polarization direction respectively with polarization mode controller
The tangential direction of paddle is parallel with normal direction, lp11byMode direction and polarization direction with the paddle of polarization mode controller
Tangential direction is parallel；
As the LP that mode direction is identical but polarization direction is different11After mode passes through polarization mode controller, polarization mode control
The substrate of device processed to less fundamental mode optical fibre substrate inverse conversion matrix
If the single order mode in less fundamental mode optical fibre is the combination of four orthogonal modes, any single order mode E=in optical fiber
EAX|LP11AX>+EBX|LP11BX>+EAY|LP11AY>+EBY|LP11BY>, EAXFor LP11AXThe amplitude of mode, EBXFor LP11BXThe vibration of mode
Width, EAYFor LP11AYThe amplitude of mode, EBYFor LP11BYThe amplitude of mode；
F (r) is the solution of first-order bessel function, r andIt is radially and angularly coordinate,WithFor the direction of polarization, difference
It is aligned with horizontal and vertical direction；
The mode in less fundamental mode optical fibre is expressed as by Jones matrixThen polarization mode controller exports
Mode Eoutput=R' × T × R × E.
Optionally, in the mode converter of the embodiment of the present invention, if the mode direction of input pattern E is horizontal and polarizes
It is linear, and the angle of polarization and x-axis angle are θ, thenIf α=45 °,Then
Optionally, the polarizer is specifically used for, if the first polarization direction is the direction y, the second polarization direction is the direction x, different
Mode intensity of the single order mode in x-polarisation direction be
Wherein, the rotation angle of mode and input line polarization angle are linear relationships, and the two differs
Optionally, the basic mode in different polarization direction is by electronic Polarization Controller to the light settings obtained from laser light source
What different polarization directions obtained.
The embodiment of the invention also provides a kind of electronic equipment, and referring to Figure 10, Figure 10 is that the electronics of the embodiment of the present invention is set
Standby structure chart, comprising: processor 1001, communication interface 1002, memory 1003 and communication bus 1004, wherein processor
1001, communication interface 1002, memory 1003 complete mutual communication by communication bus 1004；
Memory 1003, for storing computer program；
Processor 1001 when for executing the program stored on memory 1003, realizes any of the above-described mode conversion side
The step of method.
It should be noted that the communication bus 1004 that above-mentioned electronic equipment is mentioned can be PCI (Peripheral
Component Interconnect, Peripheral Component Interconnect standard) bus or EISA (Extended Industry Standard
Architecture, expanding the industrial standard structure) bus etc..The communication bus 1004 can be divided into address bus, data/address bus,
Control bus etc..Only to be indicated with a thick line in Figure 10, it is not intended that an only bus or a seed type convenient for indicating
Bus.
Communication interface 1002 is for the communication between above-mentioned electronic equipment and other equipment.
Memory 1003 may include RAM (Random Access Memory, random access memory), also may include
Nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.Optionally, memory may be used also
To be storage device that at least one is located remotely from aforementioned processor.
Above-mentioned processor 1001 can be general processor, comprising: CPU (Central Processing Unit, in
Central processor), NP (Network Processor, network processing unit) etc.；It can also be DSP (Digital Signal
Processing, digital signal processor), ASIC (Application Specific Integrated Circuit, it is dedicated
Integrated circuit), FPGA (Field-Programmable Gate Array, field programmable gate array) or other are programmable
Logical device, discrete gate or transistor logic, discrete hardware components.
In the electronic equipment of the embodiment of the present invention, processor is obtained different by executing the program stored on memory
The basic mode in different polarization direction, is converted to that mode direction is identical but polarization direction by modeling coupler by the basic mode of polarization direction
Different LP11Mode；By polarization mode controller by mode direction is identical but polarization direction is different LP11Mode is converted to
Different single order modes；The first polarization direction of different single order modes is filtered out respectively by the polarizer, retains different one
Second polarization direction of rank mode obtains the different LP in mode direction11Mode.The present invention can be identical by mode direction but polarizes
The different LP in direction11Mode is converted to the different LP in mode direction11Mode, and the direction of energy High-speed Control mode.
The embodiment of the invention also provides a kind of computer readable storage medium, it is stored in computer readable storage medium
Computer program, when computer program is executed by processor, the step of realizing any of the above-described mode conversion method.
When the instruction stored in the computer readable storage medium of the embodiment of the present invention is run on computers, obtain different
The basic mode in different polarization direction, is converted to that mode direction is identical but polarization direction by modeling coupler by the basic mode of polarization direction
Different LP11Mode；By polarization mode controller by mode direction is identical but polarization direction is different LP11Mode is converted to
Different single order modes；The first polarization direction of different single order modes is filtered out respectively by the polarizer, retains different one
Second polarization direction of rank mode obtains the different LP in mode direction11Mode.The present invention can be identical by mode direction but polarizes
The different LP in direction11Mode is converted to the different LP in mode direction11Mode, and the direction of energy High-speed Control mode.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Turn especially for mode
For parallel operation, electronic equipment and readable storage medium storing program for executing embodiment, since it is substantially similar to the method embodiment, so the ratio of description
Relatively simple, the relevent part can refer to the partial explaination of embodiments of method.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (9)
1. one mode conversion method, which is characterized in that the described method includes:
The basic mode for obtaining different polarization direction, is converted to mode side for the basic mode in the different polarization direction by modeling coupler
To identical but different polarization direction LP11Mode；
By polarization mode controller by the mode direction is identical but polarization direction is different LP11Mode is converted to different one
Rank mode；
The first polarization direction of the different single order mode is filtered out respectively by the polarizer, retains the different First-Order Mode
Second polarization direction of formula obtains the different LP in mode direction11Mode；
It is described by polarization mode controller by the mode direction is identical but polarization direction is different LP11Mode is converted to difference
Single order mode, comprising:
Pass through First-Order Mode in the angle and polarization mode controller of paddle plane and horizontal direction in change polarization mode controller
Phase difference between four substrates of formula, by the LP that the mode direction is identical but polarization direction is different11Mode is converted to difference
Single order mode.
2. mode conversion method according to claim 1, which is characterized in that change single order in the polarization mode controller
The mode of phase difference between four substrates of mode, comprising:
Less fundamental mode optical fibre is wrapped on the paddle of Polarization Controller, four single order mode substrates are generated, by changing few mould light
The circle number that fibre is wound on the paddle of the Polarization Controller changes four substrates of single order mode in the polarization mode controller
Between phase difference；
Wherein, the phase difference in polarization mode controller between any two single order mode substrate is
L=2 π RN, N are the circle numbers that less fundamental mode optical fibre is wound on the paddle of the Polarization Controller, and Δ n is between corresponding two substrates
Effective refractive index is poor, and R is the bending radius of the paddle of the Polarization Controller.
3. mode conversion method according to claim 2, which is characterized in that described by changing in polarization mode controller
Phase difference in the angle and polarization mode controller of paddle plane and horizontal direction between four substrates of single order mode, will
The LP that the mode direction is identical but polarization direction is different11Mode is converted to different single order modes, comprising:
If paddle plane rotates angle [alpha], base in the polarization mode controller from horizontal direction in the polarization mode controller
Rotation alpha degree is distinguished in the mode direction at bottom and polarization direction；
If the substrate LP of the less fundamental mode optical fibre11AXMode direction and polarization direction be horizontal direction, the base of the less fundamental mode optical fibre
Bottom LP11BXMode direction and polarization direction be respectively vertically and horizontally, the substrate LP of the less fundamental mode optical fibre11AY's
Mode direction and polarization direction are respectively horizontal direction and vertical direction, the substrate LP of the less fundamental mode optical fibre11BYMode direction
It is vertical direction with polarization direction, by the substrate LP of the less fundamental mode optical fibre11AX、LP11BX、LP11AYAnd LP11BYIt rotates to described
The substrate lp of polarization mode controller11ax、lp11bx、lp11ayAnd lp11byTransition matrix R (α) indicate are as follows:
If the phase delay that the different mode in the identical polarization direction in the mode direction generates in the polarization mode controller
Matrix Indicate lp11axAnd lp11byPhase difference,Indicate lp11bxAnd lp11byPhase difference,Indicate lp11ayAnd lp11byPhase difference；lp11ax、lp11bx、
lp11ayAnd lp11byFor the substrate of single order mode in the polarization mode controller, and lp11axMode direction and polarization direction it is equal
It is parallel with the normal direction of the paddle of polarization mode controller, lp11bxMode direction and polarization direction respectively with polarization mode control
The normal direction of the paddle of device processed is parallel with tangential direction, lp11ayMode direction and polarization direction respectively with polarization mode control
The tangential direction of the paddle of device is parallel with normal direction, lp11byMode direction and polarization direction with polarization mode controller
The tangential direction of paddle is parallel；
As the LP that the mode direction is identical but polarization direction is different11It is described inclined after mode passes through the polarization mode controller
Shake mode controller substrate to the less fundamental mode optical fibre substrate inverse conversion matrix
If the single order mode in less fundamental mode optical fibre is the combination of four orthogonal modes, any single order mode E=E in optical fiberAX|
LP11AX>+EBX|LP11BX>+EAY|LP11AY>+EBY|LP11BY>, EAXFor LP11AXThe amplitude of mode, EBXFor LP11BXThe amplitude of mode,
EAYFor LP11AYThe amplitude of mode, EBYFor LP11BYThe amplitude of mode；
F (r) is the solution of first-order bessel function, r andIt is radially and angularly coordinate,WithFor the direction of polarization, respectively and water
Gentle vertical direction alignment；
The mode in the less fundamental mode optical fibre is expressed as by Jones matrixThe then polarization mode controller output
Mode Eoutput=R' × T × R × E.
4. mode conversion method according to claim 3, which is characterized in that if the mode direction of input pattern E is horizontal
And polarization be linear, and the angle of polarization and x-axis angle are θ, thenIf α=45 °,Then
5. mode conversion method according to claim 4, which is characterized in that it is described by the polarizer respectively by the difference
The first polarization direction of single order mode filter out, retain the second polarization direction of the different single order mode, obtain mode side
To different LP11Mode, comprising:
If the first polarization direction is the direction y, the second polarization direction is the direction x, and mould of the different single order modes in x-polarisation direction is strong
Degree is Wherein, the rotation angle and input line of mode
Polarization angle is linear relationship, and the two differs
6. mode conversion method according to claim 1, which is characterized in that the basic mode in the different polarization direction is to pass through
The electronic Polarization Controller polarization direction different to the light settings obtained from laser light source obtains.
7. one mode converter, which is characterized in that the mode converter includes:
The basic mode in the different polarization direction is converted to mode for obtaining the basic mode in different polarization direction by modeling coupler
The LP that direction is identical but polarization direction is different11Mode；
Polarization mode controller, for by the mode direction is identical but polarization direction is different LP11Mode is converted to different
Single order mode；
The polarizer retains the different single order for respectively filtering out the first polarization direction of the different single order mode
Second polarization direction of mode obtains the different LP in mode direction11Mode；
The polarization mode controller is specifically used for:
Pass through First-Order Mode in the angle and polarization mode controller of paddle plane and horizontal direction in change polarization mode controller
Phase difference between four substrates of formula, by the LP that the mode direction is identical but polarization direction is different11Mode is converted to difference
Single order mode.
8. a kind of electronic equipment characterized by comprising processor, communication interface, memory and communication bus, wherein described
Processor, the communication interface, the memory complete mutual communication by the communication bus；
The memory, for storing computer program；
The processor when for executing the program stored on the memory, realizes any mould of claim 1-6
The step of formula conversion method.
9. a kind of computer readable storage medium, which is characterized in that be stored with computer in the computer readable storage medium
Program when the computer program is executed by processor, realizes the step of any mode conversion method of claim 1-6
Suddenly.
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| CN102736181A (en) * | 2012-07-11 | 2012-10-17 | 浙江大学 | Integrated optical waveguide polarization beam splitter for mode multiplexing system |
| CN104793344A (en) * | 2015-05-07 | 2015-07-22 | 中国科学院光电技术研究所 | Polarization conversion device |
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| US8634718B2 (en) * | 2010-05-28 | 2014-01-21 | Infinera Corporation | Polarization control in a photonic integrated circuit |
| JP5972356B2 (en) * | 2011-04-25 | 2016-08-17 | オーエフエス ファイテル，エルエルシー | Raman distributed feedback fiber laser and high power laser system using the same |
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| CN102736181A (en) * | 2012-07-11 | 2012-10-17 | 浙江大学 | Integrated optical waveguide polarization beam splitter for mode multiplexing system |
| CN104793344A (en) * | 2015-05-07 | 2015-07-22 | 中国科学院光电技术研究所 | Polarization conversion device |
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