CN106646757A - Multiplexer and light-combining method thereof - Google Patents
Multiplexer and light-combining method thereof Download PDFInfo
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- CN106646757A CN106646757A CN201710131141.0A CN201710131141A CN106646757A CN 106646757 A CN106646757 A CN 106646757A CN 201710131141 A CN201710131141 A CN 201710131141A CN 106646757 A CN106646757 A CN 106646757A
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- wave plate
- polarization light
- beam splitter
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Classifications
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- 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
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
-
- 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
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
-
- 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
Abstract
The invention provides a multiplexer and a light-combining method thereof. The multiplexer comprises a first 1/2 wave plate, a second 1/2 wave plate, a first beam splitter, a second beam splitter, a first 1/4 wave plate, a second 1/4 wave plate, a faraday rotary slice and a third beam splitter, wherein the first 1/2 wave plate is used for simultaneously receiving a first path P polarized light and a second path P polarized light passing by the first 1/2 wave plate; the first 1/4 wave plate is used for receiving the light passing by the first beam splitter; the second beam splitter is used for simultaneously receiving a third path P polarized light and a fourth path P polarized light passing by the second 1/2 wave plate; the second 1/4 wave plate is used for receiving the light passing by the second beam splitter; the faraday rotary slice is used for receiving the light passing by the first 1/4 wave plate and the second 1/4 wave plate; the third beam splitter is used for receiving the light passing by the faraday rotary slice. The multiplexer can achieve a function of combining multipath light into one-path light, namely, multi-channel confluence, through the light combination effect of the beam splitter and the light rotation effect of the wave plate.
Description
Technical field
The invention belongs to intelligent acess technical field, and in particular to a kind of multiplexer and its light combination method.
Background technology
Fig. 1 is the schematic diagram of existing multidiameter delay optical transceiver structure, its be multidiameter delay TOSA (light emitting devices,
Transmit Optical Sub-Assembly) and multidiameter delay ROSA (light-receiving secondary module, Receiver Optical
Subassembly) common wavelength division multiplexer structure is used, it includes light emitting array 1, the first microlens array 2, photo-detector
Array 3, the second microlens array 4, completely reflecting mirror 6, the optical fiber collimator 7 of wavelength division multiplexer 5 and two.The wavelength division multiplexer 5 includes
One plate retaining element 501, retaining element one side is fully reflecting surface 502, and another side is interference filter chip arrays 503, respectively
It is corresponding with each luminescence unit of light emitting array 1, only transmit the wavelength light of corresponding luminescence unit.First microlens array 2 with send out
The correspondence of optical arrays 1, the second microlens array 4 is corresponding with photodetector array 3；Light emitting array 1 is vertical with photodetector array 3 to be set
Put and stagger up and down；Two optical fiber collimators 7 be arranged in parallel, respectively as input optical fibre collimater 702 receive incident optical signal and
Output optical fibre collimater 701 launches optical signal, and incident light is with launching light up and down parallel through wavelength division multiplexer 5；Completely reflecting mirror 6 is put
In transmitting light path, by launching light reflect 90 ° with incident parallel light, or be placed in input path, by with transmitting parallel light
Incident light reflects 90 ° and enters photodetector array 3.
The wavelength division multiplexer that existing multidiameter delay optical transceiver structure is formed by two fully-reflected planes, its complex structure cost
It is high.
The content of the invention
It is an object of the invention to provide a kind of optically-active effect of closing light and wave plate by beam splitter reaches multi-path light
Synthesize the multiplexer and its light combination method of light all the way.
The present invention provides a kind of multiplexer, and it includes：Send the first laser transmitter of first via P polarization light, send out
Go out the second laser transmitter of the second road P polarization light, send the 3rd generating laser of the 3rd road P polarization light, send the 4th road P
4th generating laser of polarised light, the one 1/2 wave plate, the 2nd 1/2 wave plate, the first beam splitter, the second beam splitter, the 1st
Wave plate, the second quarter wave plate, faraday rotator and the 3rd beam splitter；Wherein, first beam splitter receives process simultaneously
The first via P polarization light of the one 1/2 wave plate and the second road P polarization light, the first quarter wave plate is received through first beam splitter
Light；Second beam splitter receives the 3rd road P polarization light and the 4th road P polarization light through the 2nd 1/2 wave plate simultaneously, and second
Quarter wave plate receives the light through the second beam splitter；Faraday rotator is received through the first quarter wave plate and the second quarter wave plate
Light；3rd beam splitter receives the light through faraday rotator.
Preferably, first via P polarization light, the second road P polarization light, the 3rd road P polarization light and the 4th road P polarization light are equal
For the light beam of different wave length.
Preferably, first beam splitter is located at the front of the one 1/2 wave plate, and first quarter wave plate is located at institute
The front of the first beam splitter is stated, second beam splitting is located at the 2nd 1/2 wave plate front, and second quarter wave plate is located at institute
State the front of the second beam splitter.
Preferably, the faraday rotator is respectively positioned on first quarter wave plate and the second quarter wave plate front.
Preferably, the 3rd beam splitter is located at faraday rotator front.
The present invention also provides a kind of light combination method of multiplexer, comprises the steps：
The first step：First via P polarization light becomes first via S-polarization light through the one 1/2 wave plate；3rd road P polarization light Jing
Cross the one 1/2 wave plate and become the 3rd road S-polarization light；
Second step：First via S-polarization light and the second road P polarization light enter the first quarter wave plate through the first beam splitter simultaneously；
3rd road S-polarization light and the 4th road P polarization light enter the second quarter wave plate through the second beam splitter simultaneously；
3rd step：First via S-polarization light becomes first via left circularly polarized light, the second road P polarization through the first quarter wave plate
Light becomes the second road right-circularly polarized light through the first quarter wave plate；3rd road S-polarization light becomes the 3rd through the second quarter wave plate
Road right-circularly polarized light, the 4th road P polarization light becomes the 4th road left circularly polarized light through the second quarter wave plate；
4th step：First via left circularly polarized light and the second road right-circularly polarized light become after faraday rotator
S-polarization light, the 3rd road right-circularly polarized light and the 4th road left circularly polarized light become P polarization after faraday rotator
Light；
5th step：The S-polarization light obtained through the 4th step and P polarization light, the S-polarization light and P polarization light are through the 3rd point
All the way S-polarization light and P polarization light are projected the synthesis of beam device.
The present invention also provides a kind of multiplexer, and it includes：Send first via P polarization light first laser transmitter,
The second laser transmitter of the second road P polarization light is sent, the 3rd generating laser of the 3rd road P polarization light is sent, is sent the 4th
4th generating laser of road P polarization light, the one 1/2 wave plate, the 2nd 1/2 wave plate, the first beam splitter, the second beam splitter, first
Quarter wave plate, the second quarter wave plate, faraday rotator, the 3rd 1/2 wave plate and the 3rd beam splitter；Wherein, first beam splitting
Device receives the first via P polarization light and the second road P polarization light through the one 1/2 wave plate simultaneously, and first quarter wave plate connects
Receive the light through the first beam splitter；Second beam splitter receive simultaneously through the 2nd 1/2 wave plate the 3rd road P polarization light and
4th road P polarization light, the second quarter wave plate receives the light through the second beam splitter；Faraday rotator is received through the 1st
The light of wave plate and the second quarter wave plate；3rd 1/2 wave plate receives the light through top half faraday rotator；Institute
State the 3rd beam splitter to receive through the latter half faraday rotator and the light of the 3rd 1/2 wave plate.
Preferably, first via P polarization light, the second road P polarization light, the 3rd road P polarization light and the 4th road P polarization light are equal
For the light beam of different wave length.
Preferably, the 3rd 1/2 wave plate is located at the front of part on the faraday rotator.
The present invention also provides a kind of light combination method of multiplexer, comprises the steps：
The first step：First via P polarization light becomes first via S-polarization light through the one 1/2 wave plate；3rd road P polarization light Jing
Cross the one 1/2 wave plate and become the 3rd road S-polarization light；
Second step：First via S-polarization light and the second road P polarization light enter the first quarter wave plate through the first beam splitter simultaneously；
3rd road S-polarization light and the 4th road P polarization light enter the second quarter wave plate through the second beam splitter simultaneously；
3rd step：First via S-polarization light becomes first via left circularly polarized light, the second road P polarization through the first quarter wave plate
Light becomes the second road right-circularly polarized light through the first quarter wave plate；3rd road S-polarization light becomes the 3rd through the second quarter wave plate
Road left circularly polarized light, the 4th road P polarization light P4 becomes the 4th road right-circularly polarized light through the second quarter wave plate；
4th step：First via left circularly polarized light, the second road right-circularly polarized light, the 3rd road left circularly polarized light and
4th road right-circularly polarized light becomes polarised light after faraday rotator；
5th step：By first via left circularly polarized light and the second road right-circularly polarized light through the faraday rotator into
For P polarization light, the P polarization light becomes S-polarization light through the 3rd 1/2 wave plate；
6th step：By the 3rd road left circularly polarized light and the 4th road right-circularly polarized light of the 4th step through Faraday
The S-polarization light for becoming P polarization light after piece and being obtained by the 5th step synthesizes S-polarization light and P polarization all the way through the 3rd beam splitter
Light is projected.
This multiplexer passes through the closing light of beam splitter (BS, Beam Splitter) BS, and the optically-active effect of wave plate reaches
The effect of light all the way, i.e. multichannel are synthesized to multi-path light to converge.
Description of the drawings
Fig. 1 is the structural representation of existing multidiameter delay optical transceiver structure；
Fig. 2 is the structural representation of multiplexer first embodiment of the present invention；
Fig. 3 is the structural representation of multiplexer second embodiment of the present invention；
Fig. 4 is the structural representation of the beam splitter of multiplexer shown in Fig. 2 and Fig. 3；
Fig. 5 is the fundamental diagram for passing through quarter wave plate when P polarization light；
Fig. 6 is the fundamental diagram for passing through quarter wave plate when S-polarization light.
Specific embodiment
Multiplexer of the present invention, it includes light emission secondary module (TOSA, Transmitter Optical
Subassembly) and light-receiving sub-assembly (ROSA, Receiver Optical Subassembly), wherein TOSA mainly should
Optical signal (E/O conversions) is changed into used in electric signal, performance indications have luminous power, threshold value etc.；ROSA mainly turns using optical signal
Chemical conversion electric signal (O/E conversions), main performance index has sensitivity (Sen) etc..Multiplexer of the present invention can be used as closing light
The effect of element or beam splitter.
The structural representation of the first embodiment of this multiplexer is illustrated in figure 2, this multiplexer includes：Send
The first laser transmitter of first via P polarization light P1, the second laser transmitter for sending the second road P polarization light P2, send the 3rd
3rd generating laser of road P polarization light P3, send the 4th generating laser of the 4th road P polarization light P4, receive first via P
One 1/2 wave plate 11 of polarised light P1, the 2nd 1/2 wave plate 12 for receiving the 3rd road P polarization light P3, positioned at the one 1/2 wave plate
First beam splitter 21 in 11 fronts, the second beam splitter 22 positioned at the front of the 2nd 1/2 wave plate 12, positioned at the front of the first beam splitter 21
The first quarter wave plate 31, the second quarter wave plate 32 positioned at the front of the second beam splitter 22, be respectively positioned on the first quarter wave plate 31 and second
The faraday rotator 41 and the 3rd beam splitter 51 positioned at the front of faraday rotator 41 in the front of quarter wave plate 32.
Wherein, first via P polarization light P1, the second road P polarization light P2, the 3rd road P polarization light P3 and the 4th road P polarization
Light P4 is the light beam of different wave length.
First beam splitter 21 is received through the first via P polarization light P1 of the one 1/2 wave plate 11 and by second laser simultaneously to be sent out
The second road P polarization light P2 that emitter sends, the first quarter wave plate 31 receives the light through the first beam splitter 21；Second beam splitter
22 to receive the 4th road P sent through the 3rd road P polarization light P3 of the 2nd 1/2 wave plate 12 and by the 4th generating laser simultaneously inclined
Shake light P4, and the second quarter wave plate 32 receives the light through the second beam splitter 22；Faraday rotator 41 is received through the 1st
The light of the quarter wave plate 32 of wave plate 31 and second；3rd beam splitter 51 receives the light through faraday rotator 41.
As shown in Fig. 2 when this multiplexer is used as closing light element, the light combination method of this multiplexer, including such as
Lower step：
The first step：When one 1/2 wave plate 11, first via P polarization light P1 becomes first via S to first via P polarization light P1
Polarised light S1；When one 1/2 wave plate 12, the 3rd road P polarization light P3 becomes the 3rd road S-polarization light to 3rd road P polarization light P3
S3；
Second step：First via S-polarization light S1 projects first beam splitter 21 through the full transmitting of the first beam splitter 21, and second
Road P polarization light P2 is directly over first beam splitter 21, and first via S-polarization light S1 and the second road P polarization light P1 is simultaneously through the
One beam splitter 21 enters the first quarter wave plate 31；3rd road S-polarization light S3 through the full transmitting of the second beam splitter 22 project this second
Beam splitter 22, the 4th road P polarization light P4 is directly over second beam splitter 22, the 3rd road S-polarization light S3 and the 4th road P polarization light
P4 enters the second quarter wave plate 32 through the second beam splitter 22 simultaneously；
3rd step：First via S-polarization light S1 becomes first via left circularly polarized light, the second road P through the first quarter wave plate 31
Polarised light S2 becomes the second road right-circularly polarized light through the first quarter wave plate 31；3rd road S-polarization light S3 is through the 2nd 1/4 ripple
Piece 32 becomes the 3rd road right-circularly polarized light, and it is inclined that the 4th road P polarization light P4 becomes the left-handed circle in the 4th tunnel through the second quarter wave plate 32
Shake light；
4th step：First via left circularly polarized light, the second road right-circularly polarized light, the 3rd road right-circularly polarized light and
4th road left circularly polarized light simultaneously through drawing optical rotation plate 41, faraday rotator 41 by all incident lights clockwise or the inverse time
Pin rotates to an angle, for example, P polarization light through quarter wave plate into right-circularly polarized light, then through the farad of rotate counterclockwise
After optical rotation plate 41, by becoming P polarization light；I.e.：First via left circularly polarized light and the second road right-circularly polarized light pass through farad
Become S-polarization light after optical rotation plate 41, the 3rd road right-circularly polarized light and the 4th road left circularly polarized light revolve through faraday
Become P polarization light after mating plate 41；
5th step：The S-polarization light obtained through the 4th step and P polarization light, the S-polarization light and P polarization light are through the 3rd point
Beam device 51 synthesizes S-polarization light all the way and P polarization light is projected.
The structural representation of the second embodiment of this multiplexer is illustrated in figure 3, this multiplexer includes：Send
The first laser transmitter of first via P polarization light P1, the second laser transmitter for sending the second road P polarization light P2, send the 3rd
3rd generating laser of road P polarization light P3, send the 4th generating laser of the 4th road P polarization light P4, receive first via P
One 1/2 wave plate 110 of polarised light P1, the 2nd 1/2 wave plate 120 for receiving the 3rd road P polarization light P3, positioned at the one 1/2 ripple
First beam splitter 210 in the front of piece 110, the second beam splitter 220 positioned at the front of the 2nd 1/2 wave plate 12, positioned at the first beam splitter
First quarter wave plate 310 in 21 fronts, the second quarter wave plate 320 positioned at the front of the second beam splitter 220, it is respectively positioned on the one 1/4 ripple
The faraday rotator 410 in the front of 310 and second quarter wave plate of piece 320, in front of part on the faraday rotator 410
3rd 1/2 wave plate 610 and the 3rd beam splitter 510 positioned at the front of the 3rd 1/2 wave plate 610.
Wherein, first via P polarization light P1, the second road P polarization light P2, the 3rd road P polarization light P3 and the 4th road P polarization
4th generating laser of light P4 is the light beam of different wave length.
First beam splitter 210 is received through the first via P polarization light P1 of the one 1/2 wave plate 110 and by second laser simultaneously
The second road P polarization light P2 that transmitter sends, the first quarter wave plate 310 receives the light through the first beam splitter 21；Second beam splitting
Device 220 receives the 4th tunnel sent through the 3rd road P polarization light P3 of the 2nd 1/2 wave plate 12 and by the 4th generating laser simultaneously
P polarization light P4, the second quarter wave plate 320 receives the light through the second beam splitter 220；Faraday rotator 410 is received through
The light of one quarter wave plate 310 and the second quarter wave plate 320；3rd 1/2 wave plate 610 is received through top half faraday rotator
410 light；3rd beam splitter 51 receives the light through the wave plate 610 of the latter half faraday rotator 41 and the 3rd 1/2.
As shown in figure 3, when this multiplexer is used as closing light element, the light combination method of this multiplexer, including such as
Lower step：
The first step：When one 1/2 wave plate 110, first via P polarization light P1 becomes first via S to first via P polarization light P1
Polarised light S1；When one 1/2 wave plate 120, the 3rd road P polarization light P3 becomes the 3rd road S-polarization light to 3rd road P polarization light P3
S3；
Second step：First via S-polarization light S1 projects first beam splitter 210 through the full transmitting of the first beam splitter 210, the
Two road P polarization light P2 are directly over first beam splitter 210, and first via S-polarization light S1 and the second road P polarization light P2 is passed through simultaneously
First beam splitter 210 enters the first quarter wave plate 310；3rd road S-polarization light S3 is projected through the full transmitting of the second beam splitter 220
Second beam splitter 220, the 4th road P polarization light P4 is directly over second beam splitter 220, the 3rd road S-polarization light S3 and the 4th
Road P polarization light P4 enters the second quarter wave plate 320 through the second beam splitter 220 simultaneously；
3rd step：First via S-polarization light S1 becomes first via left circularly polarized light, the second tunnel through the first quarter wave plate 310
P polarization light P2 becomes the second road right-circularly polarized light through the first quarter wave plate 310；3rd road S-polarization light S3 is through the 2nd 1/4
Wave plate 320 becomes the 3rd road left circularly polarized light, and the 4th road P polarization light P4 becomes the 4th tunnel dextrorotation through the second quarter wave plate 320
Circularly polarized light；
4th step：First via left circularly polarized light, the second road right-circularly polarized light, the 3rd road left circularly polarized light and
4th road right-circularly polarized light simultaneously through drawing optical rotation plate 41, faraday rotator 41 by all incident lights clockwise or the inverse time
Pin rotates to an angle, for example, P polarization light through quarter wave plate into right-circularly polarized light, then through the farad of rotate counterclockwise
After optical rotation plate 41, by becoming P polarization light；I.e.：First via left circularly polarized light, the second road right-circularly polarized light, the 3rd road are left
Rounding polarised light and the 4th road right-circularly polarized light become P polarization light after faraday rotator 41；
5th step：By first via left circularly polarized light and the second road right-circularly polarized light through the faraday rotator 41
Become P polarization light, the P polarization light becomes S-polarization light through the 3rd 1/2 wave plate 610；
6th step：By the 3rd road left circularly polarized light and the 4th road right-circularly polarized light of the 4th step through Faraday
The S-polarization light for becoming P polarization light after piece 41 and being obtained by the 5th step synthesizes S-polarization light and P all the way through the 3rd beam splitter 51
Polarised light is projected.
The first quarter wave plate 31 shown in Fig. 2 is different with the optical axis of the second quarter wave plate 32, is in mutually 90 °, the shown in Fig. 3
One quarter wave plate 310 is different with the optical axis of the second quarter wave plate 320, is mutually in 90 °.
If Fig. 4 is the structural representation of beam splitter, beam splitter has the first face 01 for being parallel to each other and the second face 02, the
Simultaneously 01, S-polarization light carries out being totally reflected to the second face 02, then reflects away through the second face 02；P polarization light can directly pass through
Second face 02, the outgoing together with the S-polarization light through two secondary reflections of P polarization light.
Beam splitter shown in Fig. 4 is adapted to above-mentioned first the 21,210, second beam splitter of beam splitter 22,220 and the 3rd point
Beam device 51,510.
Fig. 5 is the fundamental diagram for passing through quarter wave plate when P polarization light.
Before quarter wave plate, P1=P*sin45 °；P2=P*sin45 °.
After quarter wave plate, P1=P*sin45 ° of * exp (i*0)=1/ √ 2*P；
P2=P*sin45 ° of * exp (i*- pi/2s)=- i*1/ √ 2*P；
E=1/ √ 2*P [1 ,-i], i.e.,：P polarization light becomes right-circularly polarized light after quarter wave plate.
Fig. 6 is the fundamental diagram for passing through quarter wave plate when S-polarization light.
Before quarter wave plate, S1=S*sin45 °；S2=S*sin45 °.
After quarter wave plate, S1=P*sin45 ° of * exp (i*- π)=1/ √ 2*S；
S2=P*sin45 ° of * exp (i*- pi/2s)=- i*1/ √ 2*S；
E=-1/ √ 2*S [1, i], i.e.,：S-polarization light becomes left circularly polarized light after quarter wave plate.
This multiplexer passes through the closing light of beam splitter (BS, Beam Splitter) BS, and the optically-active effect of wave plate reaches
The effect of light all the way, i.e. multichannel are synthesized to multi-path light to converge.
The preferred embodiment of the present invention described in detail above, but the present invention is not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, can carry out various equivalents to technical scheme, these
Equivalents belong to protection scope of the present invention.
Claims (10)
1. a kind of multiplexer, it is characterised in that it includes：Send the first laser transmitter of first via P polarization light, send
The second laser transmitter of the second road P polarization light, the 3rd generating laser for sending the 3rd road P polarization light, to send the 4th road P inclined
Shake the 4th generating laser, the one 1/2 wave plate, the 2nd 1/2 wave plate, the first beam splitter, the second beam splitter, the one 1/4 ripple of light
Piece, the second quarter wave plate, faraday rotator and the 3rd beam splitter；Wherein, first beam splitter is received through the simultaneously
The first via P polarization light of one 1/2 wave plates and the second road P polarization light, the first quarter wave plate receives the light through first beam splitter
Line；Second beam splitter receives the 3rd road P polarization light and the 4th road P polarization light through the 2nd 1/2 wave plate simultaneously, and the 2nd 1/
4 wave plates receive the light through the second beam splitter；Faraday rotator is received through the first quarter wave plate and the second quarter wave plate
Light；3rd beam splitter receives the light through faraday rotator.
2. multiplexer according to claim 1, it is characterised in that：First via P polarization light, the second road P polarization light,
Three road P polarization light and the 4th road P polarization light are the light beam of different wave length.
3. multiplexer according to claim 1 and 2, it is characterised in that：First beam splitter is located at described first
The front of 1/2 wave plate, first quarter wave plate is located at the front of first beam splitter, and second beam splitting is located at described the
2 1/2 wave plates front, second quarter wave plate is located at the front of second beam splitter.
4. multiplexer according to claim 1 and 2, it is characterised in that：The faraday rotator is respectively positioned on described
First quarter wave plate and the second quarter wave plate front.
5. multiplexer according to claim 1 and 2, it is characterised in that：3rd beam splitter is located at the farad
Optical rotation plate front.
6. according to the light combination method of the arbitrary described multiplexer of claim 1-5, it is characterised in that comprise the steps：
The first step：First via P polarization light becomes first via S-polarization light through the one 1/2 wave plate；3rd road P polarization light is through
One 1/2 wave plates become the 3rd road S-polarization light；
Second step：First via S-polarization light and the second road P polarization light enter the first quarter wave plate through the first beam splitter simultaneously；3rd
Road S-polarization light and the 4th road P polarization light enter the second quarter wave plate through the second beam splitter simultaneously；
3rd step：First via S-polarization light becomes first via left circularly polarized light, the second road P polarization light Jing through the first quarter wave plate
Cross the first quarter wave plate and become the second road right-circularly polarized light；It is right that 3rd road S-polarization light becomes the 3rd road through the second quarter wave plate
Rounding polarised light, the 4th road P polarization light becomes the 4th road left circularly polarized light through the second quarter wave plate；
4th step：It is inclined that first via left circularly polarized light and the second road right-circularly polarized light become S after faraday rotator
Shake light, and the 3rd road right-circularly polarized light and the 4th road left circularly polarized light become P polarization light after faraday rotator；
5th step：The S-polarization light obtained through the 4th step and P polarization light, the S-polarization light and P polarization light are through the 3rd beam splitter
All the way S-polarization light and P polarization light are projected for synthesis.
7. a kind of multiplexer, it is characterised in that it includes：Send the first laser transmitter of first via P polarization light, send
The second laser transmitter of the second road P polarization light, the 3rd generating laser for sending the 3rd road P polarization light, to send the 4th road P inclined
Shake the 4th generating laser, the one 1/2 wave plate, the 2nd 1/2 wave plate, the first beam splitter, the second beam splitter, the one 1/4 ripple of light
Piece, the second quarter wave plate, faraday rotator, the 3rd 1/2 wave plate and the 3rd beam splitter；Wherein, first beam splitter is same
When receive first via P polarization light and the second road P polarization light through the one 1/2 wave plate, first quarter wave plate receives Jing
Cross the light of the first beam splitter；Second beam splitter receives the 3rd road P polarization light and the 4th through the 2nd 1/2 wave plate simultaneously
Road P polarization light, the second quarter wave plate receives the light through the second beam splitter；Faraday rotator is received through the first quarter wave plate
With the light of the second quarter wave plate；3rd 1/2 wave plate receives the light through top half faraday rotator；Described
Three beam splitters are received through the latter half faraday rotator and the light of the 3rd 1/2 wave plate.
8. multiplexer according to claim 7, it is characterised in that：First via P polarization light, the second road P polarization light,
Three road P polarization light and the 4th road P polarization light are the light beam of different wave length.
9. multiplexer according to claim 7, it is characterised in that：3rd 1/2 wave plate is located at the faraday
The front of part on optical rotation plate.
10. according to the light combination method of the arbitrary described multiplexer of claim 7-9, it is characterised in that comprise the steps：
The first step：First via P polarization light becomes first via S-polarization light through the one 1/2 wave plate；3rd road P polarization light is through
One 1/2 wave plates become the 3rd road S-polarization light；
Second step：First via S-polarization light and the second road P polarization light enter the first quarter wave plate through the first beam splitter simultaneously；3rd
Road S-polarization light and the 4th road P polarization light enter the second quarter wave plate through the second beam splitter simultaneously；
3rd step：First via S-polarization light becomes first via left circularly polarized light, the second road P polarization light Jing through the first quarter wave plate
Cross the first quarter wave plate and become the second road right-circularly polarized light；It is left that 3rd road S-polarization light becomes the 3rd road through the second quarter wave plate
Rounding polarised light, the 4th road P polarization light P4 becomes the 4th road right-circularly polarized light through the second quarter wave plate；
4th step：First via left circularly polarized light, the second road right-circularly polarized light, the 3rd road left circularly polarized light and the 4th
Road right-circularly polarized light becomes polarised light after faraday rotator；
5th step：Become P through the faraday rotator by first via left circularly polarized light and the second road right-circularly polarized light
Polarised light, the P polarization light becomes S-polarization light through the 3rd 1/2 wave plate；
6th step：By the 3rd road left circularly polarized light and the 4th road right-circularly polarized light of the 4th step after faraday rotator
Become P polarization light and synthesize S-polarization light all the way through the 3rd beam splitter by the S-polarization light that the 5th step is obtained and P polarization light is penetrated
Go out.
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