CN109491175A - A kind of restructural oriented logical device based on mode multiplexing - Google Patents
A kind of restructural oriented logical device based on mode multiplexing Download PDFInfo
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- CN109491175A CN109491175A CN201910036235.9A CN201910036235A CN109491175A CN 109491175 A CN109491175 A CN 109491175A CN 201910036235 A CN201910036235 A CN 201910036235A CN 109491175 A CN109491175 A CN 109491175A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F3/00—Optical logic elements; Optical bistable devices
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
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- G02B2006/12164—Multiplexing; Demultiplexing
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Abstract
The present invention provides a kind of restructural oriented logical device based on mode multiplexing, includes and is sequentially connected the demultiplexer connect, micro-loop array and multiplexer；Demultiplexer includes three S type waveguides and four straight wave guides being sequentially connected, and adjacent straight wave guide is connected by adiabatic taper；Micro-loop array includes of same size four piece straight wave guide arranged side by side, is coupled with one group of micro-loop group on every straight wave guide, which is made of spaced first micro-loop and the second micro-loop；Multiplexer (3) includes three S type waveguides and four straight wave guides being sequentially connected；It is connected between adjacent straight wave guide by adiabatic taper.The logical device both can solve the problem of common oriented logical device can only realize unity logic operation, the problem of can solve the multiple lasers of needs of the restructural oriented logical device based on wavelength-division multiplex again, arbitrary logical operation may be implemented, cost is greatly reduced from source, there is good application prospect in optical information processing.
Description
Technical field
The invention belongs to optical information processing technical fields, are related to a kind of restructural oriented logical device based on mode multiplexing
Part.
Background technique
From the birth of first transistor of nineteen forty-seven to the rise of the early 21st century artificial intelligence, short decades it is rapid
Develop, microelectric technique penetrates into the dribs and drabs of our lives already.However in recent years with the hair of information technology
Exhibition, requirement of the people for large capacity, high rate communication are also higher and higher.CPU core calculation based on ARM framework is more and more,
The number of transistors integrated in single core is more and more, and transistor size is smaller and smaller, the interconnection of on piece metal and power consumption and dissipates
Heat problem also becomes more and more intractable, and Moore's Law is also increasingly difficult to continue.There is some evidence that using using photon as load
The information technology of body replaces electronic information technology extremely urgent.The interconnection that various operations and device are realized instead of electricity is used up,
The integrated optical circuit being made of optical fiber and various optical elements, can greatly improve the ability to data operation and transmission.It is restructural
Oriented logical device be optical Information Processing important component.Relative to common logical device, oriented logical device
There is scalability in structure, it is functionally also more perfect.Common oriented logical device can only realize single logic
Function does not have universality.
The oriented logical device of people's research at present is typically all based on wavelength-division multiplex technique.Early in 2011, Q. Xu
Et al. article " Reconfigurable optical directed- has been delivered on famous periodical Optics Express first
logic circuits using microresonator-based optical switches”(Optics Express,
Vol. 19, Issue 6, pp. 5244-5259).Due to being the concept for being put forward for the first time reconfigurable logic, Q. Xu et al. is first
Demonstrate the thought using 8 priority encoders, but need in device using photoelectric converter so that device it is relatively complicated and
And increase cost, it is unfavorable for large-scale integrated.Appoint in addition, Y. Tian et al. realizes to generate using wavelength-division multiplex technique
The restructural oriented logical device of meaning logical combination, and deliver technical paper " Experimental demonstration of a
reconfigurable electro-optic directed logic circuit using cascaded carrier-
injection micro-ring resonators”(Scientific Reports, Vol. 7, Issue 1, pp:
6410 (2017)) etc..But the oriented logical device based on wavelength-division multiplex, need multiple laser light sources, higher cost；Again
Person causes the available channel of wavelength-division multiplex also therefore limited, wavelength-division is multiple since the wave-length coverage of available C-band is limited
Bottleneck is also just encountered with technology.In order to solve this problem, there has been proposed a kind of new optical signal multiplex mode, i.e. mode is multiple
With.The different modalities of light are exactly multiplexed on a root multimode fiber or less fundamental mode optical fibre and transmit by so-called mode multiplexing technology, and
Different mode is demultiplexed into the technology of corresponding signal by receiving end.
Summary of the invention
The object of the present invention is to provide a kind of restructural oriented logical device based on mode multiplexing, may be implemented any one
The operation of a logical function brings great convenience to the logical operation for realizing various complexity.
To achieve the above object, the technical scheme adopted by the invention is that: a kind of restructural guiding based on mode multiplexing
Logical device, including being sequentially connected the demultiplexer connect, micro-loop array and multiplexer；
The demultiplexer includes the first S type waveguide, the 2nd S type waveguide, the 3rd S type waveguide and is sequentially connected first straight
Waveguide, the second straight wave guide, third straight wave guide and the 4th straight wave guide, adjacent two straight wave guides are connected by adiabatic taper；First straight wave
The width led is greater than the width of the second straight wave guide, and the width of the second straight wave guide is greater than the width of third straight wave guide, third straight wave guide
Width be greater than the 4th straight wave guide width；
First S type waveguide, the 2nd S type waveguide, the 3rd S type waveguide and the 4th straight wave guide it is of same size；
One end of first S type waveguide is coupled with the first straight wave guide, and one end of the 2nd S type waveguide is coupled with the second straight wave guide, the 3rd S
One end of type waveguide is coupled with the 4th straight wave guide；The other end of first S type waveguide, the other end of third straight wave guide, the 2nd S type wave
The other end of the other end and the 3rd S type waveguide led is connected with micro-loop array；
The micro-loop array include the 5th straight wave guide of same size arranged side by side, the 6th straight wave guide, the 7th straight wave guide and
8th straight wave guide, one end of the 5th straight wave guide are connected with the other end of the 2nd S type waveguide, and one end of the 6th straight wave guide is straight with the 4th
The other end of waveguide is connected, and one end of the 7th straight wave guide is connected with the other end of the 3rd S type waveguide, one end of the 8th straight wave guide and
One end of first S type waveguide is connected；The other end of 5th straight wave guide, the other end of the 6th straight wave guide, the 7th straight wave guide it is another
The other end of end and the 8th straight wave guide is connected with multiplexer；
It is coupled with one group of micro-loop group on 5th straight wave guide, the 6th straight wave guide, the 7th straight wave guide and the 8th straight wave guide, the micro-loop group
It is made of spaced first micro-loop MRR and the second micro-loop MRR；The size and width and the second micro-loop MRR of first micro-loop MRR
Size and of same size, the coupling spacing between straight wave guide that all micro-loop MRR are coupled with micro-loop MRR is all the same；
The multiplexer includes the 4th S type waveguide, the 5th S type waveguide, the 6th S type waveguide and the 9th straight wave being sequentially connected
It leads, the tenth straight wave guide, the 11st straight wave guide and the 12nd straight wave guide；It is connected between adjacent two straight wave guides by adiabatic taper；The
One end of four S type waveguides is coupled with the 9th straight wave guide, and one end of the 4th S type waveguide is connected with the other end of the 8th straight wave guide, the
One end of five S type waveguides is coupled with the tenth straight wave guide, and the other end of the 5th S type waveguide is connected with the other end of the 5th straight wave guide,
One end of 6th S type waveguide is coupled with the 11st straight wave guide, the other end phase of the other end and the 7th straight wave guide of the 6th S type waveguide
Connection, the other end of the 12nd straight wave guide are connected with the other end of the 6th straight wave guide.4th S type waveguide, the 5th S type waveguide,
Six S type waveguides and the 12nd straight wave guide it is of same size
The restructural oriented logical device of the present invention has the advantages that
1, the natural characteristic of light is utilized, the information processing of high-speed high capacity may be implemented；Mature CMOS technology skill is utilized
Art, convenient for integrating with electricity component, significantly reduces so that the integrated level of device is high, small in size, low in energy consumption, favorable expandability
Element manufacturing cost, future play an important role in optical information processing.Be easily integrated, low-power consumption and CMOS work
The compatible feature of skill solves the problems, such as that modern integrated circuits develop the information capacity encountered from the root.
2, each the photoswitch based on micro-ring resonator is independent in restructural oriented logical device architecture, and all
Switch be all while concurrent working that this means that the delay of each switch can't accumulate, and it is final the result is that with
The form of light beam is exported in optics output end, thus the processing speed of entire device it is opposite with it is many fastly for electricity device.
3, it not only can solve the problem of common oriented logical device can only realize unity logic operation, but also can solve based on wavelength-division
The problem of needs multiple lasers of the restructural oriented logical device of multiplexing, arbitrary logical operation may be implemented.Therefore not
To there is good application prospect in optical information processing.
4, a wavelength need to be only inputted in input terminal, is not necessarily to multiple laser light sources, cost is greatly reduced from source.
Detailed description of the invention
Fig. 1 is the schematic diagram of the restructural oriented logical device of the present invention.
Fig. 2 is the schematic diagram of demultiplexer in the restructural oriented logical device of the present invention.
Fig. 3 is the schematic diagram of micro-loop array in the restructural oriented logical device of the present invention.
Fig. 4 is the schematic diagram that the polycyclic, mono waveguiding structure of micro-loop array is constituted in the restructural oriented logical device of the present invention.
Fig. 5 is the schematic diagram of multiplexer in the restructural oriented logical device of the present invention.
Fig. 6 is the spectral response figure of micro-ring resonator by taking silicon-based electro-optic is modulated as an example.
Fig. 7 is the micro-ring resonator of silicon substrate thermo-optic modulation or the cross-sectional structure schematic diagram of straight wave guide.
Fig. 8 is the micro-ring resonator of silicon-based electro-optic modulation or the cross-sectional structure schematic diagram of straight wave guide.
Fig. 9 is the specific example for illustrating working principle of the present invention.
Figure 10 is the waveform diagram of input signal and output signal.
Figure 11 is the module working principle diagram of the restructural oriented logical device of the present invention.
In figure: 1. demultiplexers, 2. micro-loop arrays, 3. multiplexers, the first straight wave guide of 1-1., the first S type waveguide of 1-2., 1-
3. the second straight wave guide, the 2nd S type waveguide of 1-4., 1-5. third straight wave guide, the 3rd S type waveguide of 1-6., the 4th straight wave guide of 1-7., 2-
1. the first second the 5th straight wave guide of micro-loop MRR, 2-3. of micro-loop MRR, 2-2., the 6th straight wave guide of 2-4., the 7th straight wave guide of 2-5., 2-
6. the 8th straight wave guide, the 9th straight wave guide of 3-1., the 4th S type waveguide of 3-2., the tenth straight wave guide of 3-3., the 5th S type waveguide of 3-4., 3-
5. the 11st straight wave guide, the 6th S type waveguide of 3-6., the 12nd straight wave guide of 3-7..
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, the restructural oriented logical device of the present invention, including being sequentially connected the demultiplexer 1 connect, micro-loop array
2 and multiplexer 3.
As shown in Fig. 2, the demultiplexer 1 in the restructural oriented logical device of the present invention, including the first S type waveguide 1-2, the
Two S type waveguide 1-4, the 3rd S type waveguide 1-6 and the first straight wave guide 1-1 being sequentially connected, the second straight wave guide 1-3, the straight wave of third
1-5 and the 4th straight wave guide 1-7 are led, adjacent two straight wave guides are connected by adiabatic taper (Adiabatic Taper)；First straight wave guide
The width of 1-1 is greater than the width of the second straight wave guide 1-3, and the width of the second straight wave guide 1-3 is greater than the width of third straight wave guide 1-5,
The width of third straight wave guide 1-5 is greater than the width of the 4th straight wave guide 1-7.
The width phase of first S type waveguide 1-2, the 2nd S type waveguide 1-4, the 3rd S type waveguide 1-6 and the 4th straight wave guide 1-7
Together.
One end of first S type waveguide 1-2 is coupled with the first straight wave guide 1-1, and one end of the 2nd S type waveguide 1-4 is straight with second
Waveguide 1-3 coupling, one end of the 3rd S type waveguide 1-6 is coupled with the 4th straight wave guide 1-7；The other end of first S type waveguide 1-2,
The other end of the other end of three straight wave guide 1-7, the other end of the 2nd S type waveguide 1-4 and the 3rd S type waveguide 1-6 is and micro-loop
Array 2 is connected.
As shown in figure 3, the micro-loop array 2 in the restructural oriented logical device of the present invention, including width phase arranged side by side
Same the 5th straight wave guide 2-3, the 6th straight wave guide 2-4, the 7th straight wave guide 2-5 and the 8th straight wave guide 2-6, the 5th straight wave guide 2-3's
One end is connected with the other end of the 2nd S type waveguide 1-4, one end of the 6th straight wave guide 2-4 and the other end phase of the 4th straight wave guide 1-7
Even, one end of the 7th straight wave guide 2-5 is connected with the other end of the 3rd S type waveguide 1-6, one end of the 8th straight wave guide 2-6 and the first S
One end of type waveguide 1-2 is connected；The other end, the 7th straight wave guide 2-5 of the other end of 5th straight wave guide 2-3, the 6th straight wave guide 2-4
The other end and the other end of the 8th straight wave guide 2-6 be connected with multiplexer 3.
There are interval or the insulant that hot crosstalk is generated between can preventing two micro-loop MRR between two neighboring micro-loop MRR.
One is coupled on 5th straight wave guide 2-3, the 6th straight wave guide 2-4, the 7th straight wave guide 2-5 and the 8th straight wave guide 2-6
Group micro-loop group, the micro-loop group are made of spaced first micro-loop MRR2-1 and the second micro-loop MRR2-2；First micro-loop MRR2-
The size of 1 size and width and the second micro-loop MRR2-2 and of same size, all micro-loop MRR couple straight with micro-loop MRR
Coupling spacing between waveguide is all the same.One micro-loop group and the straight wave guide coupled with the micro-loop group constitute shown in Fig. 4 polycyclic
Unicast guide structure, multiple polycyclic, mono waveguiding structure composition micro-loop arrays 2 being arranged in parallel.
As shown in figure 5, the multiplexer 3 in the restructural oriented logical device of the present invention, including the 4th S type waveguide 3-2, the 5th
S type waveguide 3-4, the 6th S type waveguide 3-6 and the 9th straight wave guide 3-1 being sequentially connected, the tenth straight wave guide 3-3, the tenth wave always
Lead 3-5 and the 12nd straight wave guide 3-7；It is connected between adjacent two straight wave guides by adiabatic taper.One end of 4th S type waveguide 3-2
It is coupled with the 9th straight wave guide 3-1, one end of the 4th S type waveguide 3-2 is connected with the other end of the 8th straight wave guide 2-6, the 5th S type wave
The one end for leading 3-4 is coupled with the tenth straight wave guide 3-3, the other end of the 5th S type waveguide 3-4 and the other end of the 5th straight wave guide 2-3
It is connected, one end of the 6th S type waveguide 3-6 is coupled with the 11st straight wave guide 3-5, and the other end of the 6th S type waveguide 3-6 and the 7th is directly
The other end of waveguide 2-5 is connected, and the other end of the 12nd straight wave guide 3-7 is connected with the other end of the 6th straight wave guide 2-4.4th
S type waveguide 3-2, the 5th S type waveguide 3-4, the 6th S type waveguide 3-6 and the 12nd straight wave guide 3-7 it is of same size.
Demultiplexer 1 and multiplexer 3 are real using structures such as directional coupler, micro-ring resonator, Y-branch or grating couplers
It is existing.
The mode for being input to the first straight wave guide 1-1 includes TEm···TE2,TE1,TE0Mould.In first straight wave guide 1-1
TEmThe TE that mode and the first S type waveguide 1-2 are supported0Mould meets index matching condition, therefore TEmMode, which is coupled, to be downloaded to
In first S type waveguide 1-2, and it is converted into basic mode TE0.In addition to this, if there is part not by complete coupling in the first straight wave guide 1-1
The TE of conjunctionmMould is continuing to be dissipated when onwards transmission passes through adiabatic taper (Adiabatic Taper), will not be to lower single order
Mode Coupling generate any interference.Similarly, the TE in the second straight wave guide 1-32What mode and the 2nd S type waveguide 1-4 were supported
TE0Mode meets index matching condition, therefore TE2Mould, which is coupled, to be downloaded in the 2nd S type waveguide 1-4 and is converted into TE0
Mould.Therefore pass through after coupling for several times, the straight wave guide for entering two micro-loop array 2 of module is all basic mode TE0。
Micro-loop array 2 is arranged by m × n micro-loop and m root straight wave guide, and the coupling spacing of micro-loop and straight wave guide is all
Identical, basic structure is the photoswitch based on MRR.Its working method taken there are two types of be respectively bar/cross state and
Cross/bar state, as shown in fig. 6, indicate after micro-loop load high level after the straight-through high level with load of optical signal optical signal by
Resistance state.Straight wave guide in micro-loop array 2 includes the 5th straight wave guide 2-3, the 6th straight wave guide 2-4, the 7th straight wave guide 2-5 and the 8th
Straight wave guide 2-6, that these straight wave guides the inside is transmitted is all basic mode TE0.By being adjusted using electric signal to each micro-loop MRR
System, including changing the group index of disc waveguide by generating heat or changing the carrier concentration in material to change
The obtained logical operation of output of the resonance wavelength of micro-loop MRR, every straight wave guide after micro-loop array 2 is all, whereinWithIndicate that dynamic voltage signal of the load in micro-loop will referred to as to operand
Logical operation is directly participated in, what is inputted in this proposition structure is dynamic electric signal, and output is dynamic optical signal.AndWithIt is right
The micro-loop of two kinds of different resonant states, the former bar/cross state are answered, the latter indicates cross/bar state, i.e.,It is micro-
Ring loads high level optical signal pass-through state,It is straight-through for load low level optical signal.Since all micro-loops are all identical, this
Body resonance wavelength having the same, therefore two kinds of different resonance wavelengths are obtained, it needs to load in a kind of micro-loop wherein presetting
Voltage processed.
It is straight that micro-loop array 2 is input to the 4th S type waveguide 3-2, the 5th S type waveguide 3-4, the 6th S type waveguide 3-6 and the 12nd
That waveguide 3-7 is all the basic mode TE for carrying AND operation result0Signal.After Mode Coupling, the 6th S type waveguide 3-6
Basic mode TE0The TE supported with the 11st straight wave guide 3-51Meet index matching condition, therefore the base of the 6th S type waveguide 3-6
Mould TE0It is coupled and is downloaded to the 11st straight wave guide 3-5 and is converted into TE1Mode.Similarly, the TE of the 5th S type waveguide 3-40Basic mode
It is coupled and is downloaded in the tenth straight wave guide 3-3, and be converted into TE2Mode.So by repeatedly coupling downloading, finally total
Inclusive-OR operation is completed in the 9th straight wave guide 3-1 of output end, that obtain is exactly Y=y1+y2+···ym。
Pass through sufficiently long adiabatic taper (Adiabatic between narrow waveguide and wide waveguide in demultiplexer 1 and multiplexer 3
Taper it) connecting, the width of adiabatic taper (Adiabatic Taper) fades to the width of wide waveguide from the width linearity of narrow waveguide,
And the extension of adiabatic taper (Adiabatic Taper) long enough, such adiabatic taper (Adiabatic Taper) waveguide side is slow
It is extended in the diffraction of optical mode, thus ensuring that basic mode when passing through do not convert by emergence pattern, reduces the crosstalk between mode.
The input of the restructural oriented logical device of the present invention is electrical signal sequence and a multi-mode single wavelength to be processed
Continuous optical signal, output be to the optical signal after electric signal operation, wherein the basic unit of each micro-loop MRR be band heat modulation
The process of the micro-ring resonator MRR photoswitch of mechanism or electrical modulation mechanism, processing is: the one of restructural oriented logical device
The continuous laser of a optical port input multi-mode single wavelength, including TEm···TE2,TE2,TE0Mould, demultiplexer process
For TE in the first straight wave guide 1-1mThe TE that mould and the first S type waveguide 1-2 are supported0Mould, which meets index matching condition, (to be had
Imitate refractive indexN eff1 =N eff2 , when two waveguides match to the effective refractive index of the light of different mode, the light in two waveguides can occur
Otherwise efficient coupling does not couple), TEmMould is downloaded in the first S type waveguide 1-2, and is converted to basic mode TE0After resuming
It is defeated.Similarly, the TE in the second straight wave guide 1-32Mould is downloaded in the 2nd S type waveguide 1-4, and is converted into TE0Continue to transmit.
Therefore, the mode in the straight wave guide being input in micro-loop array 2 is all basic mode TE0, logical to the n position binary electrical signal to operation
The form of overvoltage signal acts on m × n MRR, and the second micro-loop MRR2-2 is indicated when micro-loop loads high level in Fig. 3, micro-
Ring is in operating wave strong point resonance, and when loading low level level, micro-loop is in operating wave strong point not resonance；First micro-loop MRR2-1 is indicated
When micro-loop loads high level, micro-loop is in operating wave strong point not resonance, and when loading low level, micro-loop is humorous in operating wave strong point
Vibration, the other end of every straight wave guide just exports the logic with the electric signal of n inputs in the form of light logic in micro-loop array
AND operation is as a result, these carry the basic mode TE of AND operation result0It is re-transmitted to S type waveguide, meets index matching item
The meeting of part is downloaded in corresponding straight wave guide, completes inclusive-OR operation, finally exports TE in output endm···TE2,TE1,TE0
Mould, to realize the operation of any one logical function.
Micro-loop MRR structure of the invention can also be realized using SOI, SIN, III-V race's material.The side that the present invention optimizes
Case is realized based on SOI material, and the advantage protruded is；The ready-made CMOS technology technology of technology utilization, so that device volume
It is small, low in energy consumption, favorable expandability, convenient for integrated with electricity component.
The structural relation of feature performance benefit of the invention and its used material properties and device is close.
In terms of material: the present invention is using silicon (Silicon-On-Insulator, SOI) material in insulating substrate
Material.SOI refers in SiO2One layer is grown on insulating layer has certain thickness monocrystalline silicon thin film, technique and present microelectronics
The widely applied CMOS technology in field is compatible.Using silicon waveguide made of SOI material, sandwich layer is that Si(refractive index is
3.45), covering is SiO2The refringence of (refractive index 1.44), such covering and sandwich layer is very big, so the waveguide is to light field
Limitation capability force very much its bending radius can be with very little.
Below by the transmission process in analysis optical signal micro-loop MRR shown in Fig. 4, its working principle is briefly explained:
According to the De Morgan's laws of Boolean algebra:, then any one logical function can indicate logical operation " with
With " form, as Y=y1+y2+···yM,Wherein.That is, the expression of any one logical operation
Formula can turn to Y=y1+y2+···ymForm, wherein ymIndicate the output of every straight wave guide in micro-loop array as a result, being
N operand ' with ' operation (such as:).The principle for designing device architecture is that multiple signals are completed at the same time
AND operation, inclusive-OR operation is then realized, to be achieved that the operation of any logical function.
Illustrate its modulation principle: λ by taking Fig. 6 (Electro-optical Modulation of carrier injection) as an example1, λ2It respectively indicates and does not add any electricity
The resonance wavelength position of first micro-loop MRR2-1 and the second micro-loop MRR2-2, operation wavelength λ when pressurewIt is selected in λ1Place.With it is equal from
The Electro-optical Modulation scheme of sub- effect of dispersion illustrates its working principle.After demultiplexer 1, it is input to micro-loop array 2
Light is that wavelength is operation wavelength λ1Basic mode TE0Signal is input to the input terminal of Fig. 4.When the second micro-loop MRR2-2 is increasing level
ΔVWhen its resonance wavelength from λ2Move on to λ1(increase level, carrier injects waveguide section, and the refractive index of waveguide becomes smaller, resonance wavelength
From long wave direction short wave mobile), by this definition, for the first micro-loop MRR2-1, electric signal is that 0 optical signal is 0, telecommunications
Number for 1 optical signal be 1, for the second micro-loop MRR2-2, electric signal is that 0 optical signal is 1, electric signal be 1 optical signal
It is 0.So in the available logical operation of output port of straight wave guide, whereinIndicate load
On the first micro-loop MRR2-1 and the second micro-loop MRR2-2 to operand.
The tuning electrode of the restructural oriented logical device of the present invention can be hot modulating mechanism or electrical modulation mechanism.Silicon substrate heat
The micro-ring resonator of light modulation or the cross-sectional structure of straight wave guide are as shown in fig. 7, comprises substrate Si, substrate Si are equipped with SiO2
Layer, SiO2Layer is equipped with Si waveguide core region and tuning electrode, and waveguide and tuning surrounding them surround SiO2.Si waveguide core region
Width be W, the height of Si waveguide core region is H；The distance between Si waveguide core region top surface and tuning electrode bottom surface are dSiO2；Silicon
The micro-ring resonator of base Electro-optical Modulation or the cross-sectional structure of straight wave guide are as shown in Figure 8.
MRR with hot modulating mechanism or electrical modulation mechanism of the invention is required not in signal transmission rate (below M magnitude)
It can be needed in high speed (G magnitude) Transmission system using electrical modulation using heat modulation in the case where height.
In order to be more clear the working principle of the clear restructural oriented logical device of the description present invention, patrolled below with generating
Collecting function isSpecific example as explanation:
Required logical signal will be generated by being apparent from, and be made of three kinds of different Dynamic Signal types, it is therefore desirable to input three kinds not
Same optical mode, corresponding micro-loop array 2 are also 3 × 3 micro-loop switch arrays.Such as Fig. 9, in the input of the second straight wave guide 1-3
End input TE0, TE1And TE2Three models are input to the 5th straight wave guide 2-3, the 6th straight wave guide 2-4 then after demultiplexing
It is all basic mode TE with the 7th straight wave guide 2-50Signal.In micro-loop array, constant voltage signal is applied to following micro-loopA 2=0,A 3=1,B 3=1, then again to other micro-loopsA 1,B 1,B 2,C 1 ,C 2 ,C 3 Apply dynamic electric voltage modulated signala 1,b 1,b 2,c 1,c 2,c 3, pass through
After multiplexer 3, it can obtain carrying the TE of calculated result in the tenth straight wave guide 3-30, TE1And TE2Multimode signal.Its is right
The waveform diagram answered such as Figure 10, what output end obtained is logical function。
The working principle diagram of the restructural oriented logical device of the present invention is as shown in figure 11, and the module one in Figure 11 is demultiplexing
Device 1, module two are micro-loop array 2, and module three is multiplexer 3.Demultiplexer 1 is what the structure based on directional coupler was realized.
The restructural oriented logical device can complete any one logical operation.Input is to the electric signal of operation and a multi-mode
Continuous optical signal, output is to the optical signal after electric signal logical operation, wherein the basic unit of each micro-ring resonator MRR
For the micro-ring resonator MRR photoswitch with hot modulating mechanism or electrical modulation mechanism, the process of operation is: in a light of device
The Single wavelength continuous laser for learning port (main waveguide) input various modes, first with the principle of Mode Coupling in main waveguide
Various modes are demultiplexed, and basic mode TE will be become by being coupled to the mode at micro-loop Waveguide array0, to operation electric signal distinguish
It is loaded in the form of low and high level on each micro-loop MRR according to 1 and 0 state, in each straight wave guide end port with light logic
Form export basic mode TE0, "AND" logical operation is completed, the principle of Mode Coupling is finally utilized again, by these mode multiplexings
Onto a main waveguide, "or" logical operation is completed, to complete the operation of any one logical function.
The present invention is based on the restructural oriented logical devices of mode multiplexing to be with good expansibility, it is only necessary to correspondingly
The quantity for increasing the quantity of directional coupler and photoswitch in micro-loop array in mode multiplexing/demultiplexer, can patrol guiding
Collect the Function Extension of operation are as follows: realize and input TE in input terminal0-TEm(basic mode to any high-order mode), obtains logic in output end
Operation Y=y1+y2+···ym(), that is, complete arbitrary logical operation.
In the present invention, the electrical signal sequence (electric signal being added in micro-loop) to operation needs precise synchronization in time.
Under high-speed operation mode, need to carry out electrode the analysis and simulation in terms of special design and electromagnetic compatibility.
In the present invention, optical signal can transmit in a fiber to be directly entered next stage and is handled.
Claims (3)
1. a kind of restructural oriented logical device based on mode multiplexing, which is characterized in that including being sequentially connected the demultiplexing connect
Device (1), micro-loop array (2) and multiplexer (3)；
The demultiplexer (1) include the first S type waveguide (1-2), the 2nd S type waveguide (1-4), the 3rd S type waveguide (1-6) with
And the first straight wave guide (1-1), the second straight wave guide (1-3), third straight wave guide (1-5) and the 4th straight wave guide (1-7) being sequentially connected,
Adjacent two straight wave guides are connected by adiabatic taper；The width of first straight wave guide (1-1) is greater than the width of the second straight wave guide (1-3),
The width of second straight wave guide (1-3) is greater than the width of third straight wave guide (1-5), and the width of third straight wave guide (1-5) is greater than the 4th
The width of straight wave guide (1-7)；
The width of first S type waveguide (1-2), the 2nd S type waveguide (1-4), the 3rd S type waveguide (1-6) and the 4th straight wave guide (1-7)
It is identical；
One end of first S type waveguide (1-2) is coupled with the first straight wave guide (1-1), one end and second of the 2nd S type waveguide (1-4)
Straight wave guide (1-3) coupling, one end of the 3rd S type waveguide (1-6) is coupled with the 4th straight wave guide (1-7)；First S type waveguide (1-2)
The other end, the other end of third straight wave guide (1-7), the other end of the 2nd S type waveguide (1-4) and the 3rd S type waveguide (1-6)
The other end be connected with micro-loop array (2)；
The micro-loop array (2) include the 5th straight wave guide (2-3) of same size arranged side by side, the 6th straight wave guide (2-4),
7th straight wave guide (2-5) and the 8th straight wave guide (2-6), one end of the 5th straight wave guide (2-3) are another with the 2nd S type waveguide (1-4)
One end is connected, and one end of the 6th straight wave guide (2-4) is connected with the other end of the 4th straight wave guide (1-7), the 7th straight wave guide (2-5)
One end is connected with the other end of the 3rd S type waveguide (1-6), one end and the first S type waveguide (1-2) of the 8th straight wave guide (2-6)
One end is connected；The other end of 5th straight wave guide (2-3), the other end of the 6th straight wave guide (2-4), the 7th straight wave guide (2-5) it is another
The other end of one end and the 8th straight wave guide (2-6) is connected with multiplexer (3)；
It is coupled on 5th straight wave guide (2-3), the 6th straight wave guide (2-4), the 7th straight wave guide (2-5) and the 8th straight wave guide (2-6)
Have one group of micro-loop group, the micro-loop group is by spaced first micro-loop MRR(2-1) and the second micro-loop MRR(2-2) form；First
Micro-loop MRR(2-1) size and the size of width and the second micro-loop MRR(2-2) and of same size, all micro-loop MRR are micro- with this
Coupling spacing between the straight wave guide of ring MRR coupling is all the same；
The multiplexer (3) include the 4th S type waveguide (3-2), the 5th S type waveguide (3-4), the 6th S type waveguide (3-6) and
The 9th straight wave guide (3-1), the tenth straight wave guide (3-3), the 11st straight wave guide (3-5) and the 12nd straight wave guide (3- being sequentially connected
7)；It is connected between adjacent two straight wave guides by adiabatic taper；One end of 4th S type waveguide (3-2) and the 9th straight wave guide (3-1) coupling
It closes, one end of the 4th S type waveguide (3-2) is connected with the other end of the 8th straight wave guide (2-6), one end of the 5th S type waveguide (3-4)
It being coupled with the tenth straight wave guide (3-3), the other end of the 5th S type waveguide (3-4) is connected with the other end of the 5th straight wave guide (2-3),
One end of 6th S type waveguide (3-6) is coupled with the 11st straight wave guide (3-5), the other end and the 7th of the 6th S type waveguide (3-6)
The other end of straight wave guide (2-5) is connected, the other end of the 12nd straight wave guide (3-7) and the other end of the 6th straight wave guide (2-4)
It is connected；4th S type waveguide (3-2), the 5th S type waveguide (3-4), the 6th S type waveguide (3-6) and the 12nd straight wave guide (3-7)
It is of same size.
2. the restructural oriented logical device based on mode multiplexing as described in claim 1, which is characterized in that adjacent first
Micro-loop MRR(2-1) and the second micro-loop MRR(2-2) between be equipped with the interval that can prevent that hot crosstalk is generated between two micro-loop MRR or
Insulant.
3. the restructural oriented logical device based on mode multiplexing as described in claim 1, which is characterized in that demultiplexer
(1) and multiplexer (3) uses directional coupler, micro-ring resonator, Y-branch or grating coupler.
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