CN103412736A - Three-valued optical multiplier based on nonlinearity polarization rotation of semiconductor optical amplifier - Google Patents
Three-valued optical multiplier based on nonlinearity polarization rotation of semiconductor optical amplifier Download PDFInfo
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- CN103412736A CN103412736A CN2013103012025A CN201310301202A CN103412736A CN 103412736 A CN103412736 A CN 103412736A CN 2013103012025 A CN2013103012025 A CN 2013103012025A CN 201310301202 A CN201310301202 A CN 201310301202A CN 103412736 A CN103412736 A CN 103412736A
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Abstract
The invention discloses a three-valued optical multiplier based on nonlinearity polarization rotation of a semiconductor optical amplifier. The three-valued optical multiplier comprises a polarization beam splitter, a first photoelectric detector, a second photoelectric detector, a first current amplifying circuit, a second current amplifying circuit, a first polarization controller, a second polarization controller, the semiconductor optical amplifier and the like. The polarization beam splitter separates two linear polarization states, perpendicular to each other, of first way optical signals which participate in multiplication, the optical signals are converted into electric signals through the first photoelectric detector and the second photoelectric detector respectively, the electric signals are amplified to be a set driving current through the first current amplifying circuit and the second current amplifying circuit, and then the driving current is connected to the current input end of the semiconductor optical amplifier; second way optical signals which participate in the multiplication are input to the optical input end of the semiconductor optical amplifier through the polarization controllers; in the semiconductor optical amplifier, driven by the driving current converted from the first way optical signals, the second way optical signals complete the operation of polarization rotation to achieve the multiplication.
Description
Technical field
The present invention relates to the optical computer technical field, relate in particular to a kind of three value light multipliers of semiconductor optical amplifier nonlinear polarization rotation.
Background technology
Computing machine has been brought the mankind into information society, but traditional robot calculator is restricted because of the character of electricity itself, and the development of robot calculator has at present run into three bottlenecks, is respectively speed bottle-neck, yardstick bottleneck and figure place bottleneck.In order to break through this three bottlenecks, the researchist has proposed high-performance computer of new generation, mainly comprises: quantum computer, DNA computer and optical computer.Quantum computer is that a class is followed the device that the quantum mechanics rule is stored quantum information, realized quantum calculation; Still be at present theoretical and experimental study stage.DNA computer is that the conversion by DNA biological chemistry state realizes, has very high computation capability.But, within considerable time, the operator that this DNA computer is implemented to calculate can only be the molecular biology expert, this means from the DNA computer that can generally use far away, especially with existing computer network, can't be connected, the super data center such in cloud computing can't apply.By contrast, optical computer takes full advantage of the concurrency of light and the characteristics of high speed, has that calculated capacity is large, speed is high, be easy to and the advantages such as robot calculator networking, and be one of possibility overcome current robot calculator bottleneck.
The basic composition unit of optical computer comprises: all-optical logic gate, optical memory and optical operation device.Wherein, the development of all-optical logic gate is very fast, and its computation rate has reached tens Gb/s.And full optical buffer, is compared with electronic memory and is also differed several orders of magnitude although in laboratory, obtain certain progress as the important all-optical storage device of a class.Along with the development of optical technology, as miniature analyzer, polarization apparatus, photoswitch, optical bistability device, full optical buffer etc., caused the research boom of domestic and international researchist to optical computer, a plurality of optical computer models have been proposed.Wherein, three value optical computer systems are considered to the most successful example at present.Three value optical computers of the people such as Shanghai University's computer engineering and the Jin Yi of science institute research and development have been started and take the polarization characteristic of computing machine liquid crystal and be basic recent studies on direction; The photoelectricity hybrid computer system that has proposed to adopt the linear polarization of 2 quadratures and unglazed state to mean numeral substantially, realize with the conversion of the polarization state of controlling light signal, and realized kilobit magnitude computer-experiment system, by using the more liquid crystal display of pixel quantity instead, just can obtain more data bit, bring into play the numerous advantage of data bits in the photometry calculation.Yet the arithmetic speed of this optical computer system is subject to the speed of rotation that liquid crystal is lower, although the speed of rotation of liquid crystal has larger room for promotion in theory, temporarily there do not is the LCD product of more speed to emerge at present.
Three value light multipliers are to realize one of important foundation device that three value photometries are calculated, and realize that the key of three value light multipliers is the polarization state rotation.At present, can realize that the device of polarization state rotation is also few, comprise Mach-Zehnder interferometer, lithium columbate crystal, liquid crystal and semiconductor optical amplifier (SOA) etc.Wherein, although the Mach-Zehnder interferometer is that to utilize the phase differential of two arms to produce polarization rotation speed very fast, complex structure, be unfavorable for integratedly, is subjected to external interference serious, and phase modulation is more difficult stable.Although utilize the electrooptical effect of lithium columbate crystal can realize the rotation of high speed polarization, reached at present 200MHz, its insertion loss is serious, can reach 6-8dB; Liquid crystal mainly is subject to lower reaction velocity, and existing product also can't meet the rotation of high speed polarization state.And utilize SOA can realize the high speed nonlinear polarization rotation, and by great many of experiments, having been confirmed, speed can reach the femtosecond magnitude, is one of device of at present known high speed polarization rotation, is widely used in photoswitch, light logic, all-optical buffer etc.At present, utilize three value multipliers of SOA structure to yet there are no report.
Summary of the invention
The technical problem to be solved in the present invention is: how to improve speed and the signal quality of optics multiplier, make more than computing velocity reaches 1Gb/s.
In order to solve the prior art problem, the embodiment of the invention discloses a kind of three value light multipliers of based semiconductor image intensifer nonlinear polarization rotation, comprise polarization beam apparatus, the first photodetector, the second photodetector, the first current amplification circuit, the second current amplification circuit, the first Polarization Controller, semiconductor optical amplifier.Polarization beam apparatus will participate in two mutually perpendicular linear polarization of the first via light signal of multiplying to be separated, then respectively by the first photodetector, the second photodetector, light signal is converted to electric signal and via the first current amplification circuit, the second current amplification circuit, is enlarged into the drive current of setting, then be linked into the semiconductor optical amplifier current input terminal; The the second road light signal that participates in multiplying is input to the semiconductor optical amplifier light input end by the first Polarization Controller; In semiconductor optical amplifier, the second road light, under the drive current in the conversion of first via light drives, completes the operation of polarization rotation, realizes multiplying.
Further, as preferably, between the first current amplification circuit, the second current amplification circuit output terminal and semiconductor optical amplifier current input terminal, comprise filtering circuit, for current filtering.
Further, as preferably, described three-valued logic adopts balanced ternary, by the substantially numeral of+1,0 ,-1 three numeral for counting.
Further, as preferably, described three-valued logic is usingd the carrier of orhtogonal linear polarizaiton light as the balanced ternary numeral, and stipulate that one of them linear polarization, for numeral+1, is called+1 state, stipulate that another linear polarization vertical with it is numeral-1, be called-1 state, stipulate that unglazed state is numeral 0.
Further, as preferably, the second road light signal that participates in multiplying is adjusted its polarization principal axis by a Polarization Controller, makes it aim at semiconductor optical amplifier polarization axle at 45 °.
Further, as preferably, participate in the semiconductor optical amplifier driving current value corresponding to different polarization states of the first via light signal of multiplying; When first via signal was 0, the drive current of semiconductor optical amplifier was 0, and now the second road light signal can't pass through semiconductor optical amplifier, is output as 0; When first via signal was+1 state, the drive current of semiconductor optical amplifier was low, and the linear polarization of the second road light signal does not change after by semiconductor optical amplifier; When first via signal was-1 state, the drive current of semiconductor optical amplifier was high, and the second road light signal is by linear polarization half-twist after semiconductor optical amplifier.
Further, as preferably, at second Polarization Controller of output terminal configuration of semiconductor optical amplifier, make the polarization state that product is corresponding be respectively+1 state, unglazed state and-1 state.
The present invention has following beneficial effect: three value light multipliers can be realized the arithmetic speed higher than 1Gb/s, under this arithmetic speed, can guarantee still that quality of output signals is comparatively desirable; This three values multiplier can be given full play to " three values " and " at a high speed " two large advantages, efficiently solves that current three value photometries calculate that the field concurrencys are good but problem that computation rate is lower is one of feasible program realized high-speed light calculating; And the composition of this three values multiplier system is simple, power consumption is lower, be easy to the system integration, likely in optical computer, obtains widespread use.
The accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by the detailed description with reference to following, can more completely understand better the present invention and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining, wherein:
Fig. 1 is the embodiment of the present invention three value light multiplier schematic diagram.
Fig. 2 is that drive current and the SOA nonlinear polarization rotation that the embodiment of the present invention is set concerns schematic diagram.
Embodiment
With reference to Fig. 1-2, embodiments of the invention are described.
For above-mentioned purpose, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Table 1 is the corresponding relation of Trinary logic multiplier input and output light signal three value code values
| First via |
0 | 0 | 0 | -1 | -1 | -1 | +1 | +1 | +1 |
| The second road light signal | 0 | -1 | +1 | 0 | -1 | +1 | 0 | -1 | +1 |
| |
0 | 0 | 0 | 0 | +1 | -1 | 0 | -1 | +1 |
As shown in table 1, the Trinary logic multiplier that the embodiment of the present invention proposes will adopt theoretical three values that mean of balanced ternary, and balanced ternary is that numeral is-1,0 ,+1 three-shift.The orhtogonal linear polarizaiton light of usining is counted the carrier of unit as balanced ternary, and stipulates that one of them linear polarization is numeral 0 for numeral+1, another linear polarization vertical with it for numeral-1, unglazed state.
The computation rule of Trinary logic multiplier is as follows:
If 1 a road light signal numeral is arranged is 0, be output as 0.
If 2 have a road light signal numeral for+1, output is identical with another road light signal numeral.
If 3 two ways of optical signals numerals are all-1, the output optical signal numeral is+1.
Fig. 1 is a kind of three value light multipliers of based semiconductor image intensifer nonlinear polarization rotation, comprises polarization beam apparatus 101, the first photodetector 102, the second photodetector 103, the first current amplification circuit 104, the second current amplification circuit 105, the first Polarization Controller 108, semiconductor optical amplifier 107.Polarization beam apparatus 101 will participate in two mutually perpendicular linear polarization of the first via light signal of multiplying to be separated, then respectively by the first photodetector 102, the second photodetector 103, light signal is converted to electric signal and via the first current amplification circuit 104, the second current amplification circuit 105, is enlarged into the drive current of setting, then be linked into semiconductor optical amplifier 107 current input terminals; The the second road light signal that participates in multiplying is input to the light input end of semiconductor optical amplifier 107 by the first Polarization Controller 108; In semiconductor optical amplifier 107, the second road light signal, under the drive current of first via light signal conversion drives, completes the operation of polarization rotation, realizes multiplying.
Between the first current amplification circuit 104, the second current amplification circuit 105 output terminals and semiconductor optical amplifier 107 current input terminals, comprise filtering circuit 106, for current filtering.
At second Polarization Controller 109 of the output terminal of semiconductor optical amplifier 107 configuration, making product is+1,0 ,-1 o'clock, and corresponding polarization state is respectively+1 state, unglazed state and-1 state.
The nonlinear polarization rotation characteristic of semiconductor optical amplifier 107 is mainly determined by input optical power and the drive current of semiconductor optical amplifier 107, after input optical power was determined, the non-linear revolving property of semiconductor optical amplifier 107 was mainly determined by the drive current of semiconductor optical amplifier 107.When the drive current of semiconductor optical amplifier 107 was 0, input optical signal can't pass through semiconductor optical amplifier 107; When the drive current of semiconductor optical amplifier 107 was low, the input optical signal linear polarization did not change after by semiconductor optical amplifier 107; When the drive current of semiconductor optical amplifier 107 was higher, the input optical signal linear polarization was by the rear half-twist of semiconductor optical amplifier 107, as shown in Figure 2.The relation of above semiconductor optical amplifier 107 nonlinear polarization rotations and drive current is existing be experimental results demonstrate.
The scheme that realizes three value multipliers is: utilize the characteristic of the nonlinear polarization rotation of semiconductor optical amplifier 107 by the drive current decision.When first via light signal unglazed (0), the drive current of semiconductor optical amplifier 107 is that 0, the second road light signal can't pass through semiconductor optical amplifier 107, is output as 0; When first via light signal was+1 state, the drive current of semiconductor optical amplifier 107 was lower, and the second road optical signal line polarization state does not change after by semiconductor optical amplifier 107; When first via light signal was-1 state, the drive current of semiconductor optical amplifier 107 was higher, and the second road light signal is by the rear linear polarization half-twist of semiconductor optical amplifier 107 (+1 becomes-1 ,-1 becomes+1, and 0 is constant).
Due to the different driving electric current, cause the gain difference of 107 pairs of light of semiconductor optical amplifier, the Output optical power amplitude there will be larger fluctuation.In order to solve the unsettled problem of output power, can consider that semiconductor optical amplifier 107 back in Fig. 1 increase the erbium-doped optical fiber amplifier EDFA of a constant power output, making Output optical power is steady state value.
Three value multiplier arithmetic speeds based on the rotation of the high speed polarization of SOA mainly are limited by the polarization speed of rotation of semiconductor optical amplifier 107, the detection rate of photodetector and the speed of current driving circuit; At present, the polarization speed of rotation of semiconductor optical amplifier 107 can reach the fs magnitude, and the detection rate of photodetector can reach the ps magnitude, and the speed of current driving circuit also can reach the ps magnitude; Therefore, the computing velocity of this three values multiplier system can be higher than 1Gb/s; And under this arithmetic speed, the quality of output signal is comparatively desirable.
Although more than described the specific embodiment of the present invention, but those skilled in the art is to be understood that, these embodiments only illustrate, those skilled in the art in the situation that do not break away from principle of the present invention and essence, can carry out various omissions, replacement and change to the details of said method and system.For example, merge the said method step, to realize the result that essence is identical, belong to scope of the present invention thereby carry out the identical function of essence according to the identical method of essence.Therefore, scope of the present invention is only limited by appended claims.
Claims (6)
1. three of a based semiconductor image intensifer nonlinear polarization rotation are worth the light multipliers, it is characterized in that, comprise polarization beam apparatus, the first photodetector, the second photodetector, the first current amplification circuit, the second current amplification circuit, the first Polarization Controller, semiconductor optical amplifier; Polarization beam apparatus will participate in two mutually perpendicular linear polarization of the first via light signal of multiplying to be separated, then respectively by the first photodetector, the second photodetector, light signal is converted to electric signal and via the first current amplification circuit, the second current amplification circuit, is enlarged into the drive current of setting, then be linked into the semiconductor optical amplifier current input terminal; The the second road light signal that participates in multiplying is input to the semiconductor optical amplifier light input end by the first Polarization Controller; In semiconductor optical amplifier, the second road light signal, under the drive current of first via light signal conversion drives, completes the operation of polarization rotation, realizes multiplying.
2. three of based semiconductor image intensifer nonlinear polarization rotation according to claim 1 are worth the light multipliers, it is characterized in that, between the first current amplification circuit, the second current amplification circuit output terminal and semiconductor optical amplifier current input terminal, comprise filtering circuit, for current filtering.
3. three of based semiconductor image intensifer nonlinear polarization rotation according to claim 1 value light multipliers, is characterized in that, described three-valued logic adopts balanced ternary, by the substantially numeral of+1,0 ,-1 three numeral for counting.
4. three of based semiconductor image intensifer nonlinear polarization rotation according to claim 1 are worth the light multipliers, it is characterized in that, described three-valued logic is usingd the carrier of orhtogonal linear polarizaiton light as the balanced ternary numeral, and stipulate that one of them linear polarization is numeral+1, be called+1 state, stipulate that another linear polarization vertical with it is numeral-1, be called-1 state, stipulate that unglazed state is numeral 0.
5. three of based semiconductor image intensifer nonlinear polarization rotation according to claim 1 are worth the light multipliers, it is characterized in that, the the second road light signal that participates in multiplying is adjusted its polarization principal axis by a Polarization Controller, makes it aim at the semiconductor optical amplifier polarization axle at 45 °.
6. according to three of the arbitrary described based semiconductor image intensifer nonlinear polarization rotation of claim 1 to 4, be worth the light multipliers, it is characterized in that, participate in the semiconductor optical amplifier driving current value corresponding to different polarization states of the first via light signal of multiplying; When first via signal was 0, the drive current of semiconductor optical amplifier was 0, and now the second road light signal can't pass through semiconductor optical amplifier, is output as 0; When first via signal was+1 state, the drive current of semiconductor optical amplifier was low, and the linear polarization of the second road light signal does not change after by semiconductor optical amplifier; When first via signal was-1 state, the drive current of semiconductor optical amplifier was high, and the second road light signal is by linear polarization half-twist after semiconductor optical amplifier.7, according to three of the arbitrary described based semiconductor image intensifer nonlinear polarization rotation of claim 1 to 4, be worth the light multipliers, it is characterized in that, second Polarization Controller of output terminal configuration at semiconductor optical amplifier, making product is+1,0,-1 o'clock, corresponding polarization state was respectively claimed in claim 4+1 state, unglazed state and-1 state.
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| JP2000181984A (en) * | 1998-12-14 | 2000-06-30 | Yozan Inc | Multiplication circuit and filter circuit |
| CN101374024A (en) * | 2008-09-08 | 2009-02-25 | 北京交通大学 | Polarization encoding method and apparatus based on semiconductor optical amplifier |
| CN101521543A (en) * | 2009-03-20 | 2009-09-02 | 浙江工业大学 | Passive optical network trunk optical fibre link protecting device |
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