CN101957629A - Optical vector-matrix multiplier based on stable polarization VCSEL (Vertical Cavity Surface Emitting Laser) - Google Patents
Optical vector-matrix multiplier based on stable polarization VCSEL (Vertical Cavity Surface Emitting Laser) Download PDFInfo
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- CN101957629A CN101957629A CN 201010268625 CN201010268625A CN101957629A CN 101957629 A CN101957629 A CN 101957629A CN 201010268625 CN201010268625 CN 201010268625 CN 201010268625 A CN201010268625 A CN 201010268625A CN 101957629 A CN101957629 A CN 101957629A
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Abstract
The invention discloses an optical vector-matrix multiplier system based on a stable polarization VCSEL (Vertical Cavity Surface Emitting Laser), which belongs to the field of optical computer. In the invention, a sub-wavelength grating is processed at a VCSEL perforation place so that the polarization noise of VCSEL light source emergent light is greatly reduced and the VCSEL light source emergent light becomes stable so as to eliminate the impact of unstable VCSEL light source polarization on the calculation of the optical vector-matrix multiplier; in addition, the calculation process of the optical vector-matrix multiplier can be completed by using one path of polarization light, and thus the structure of the optical vector-matrix multiplier system is greatly simplified. The invention realizes multi-gray level calculation, improves the calculation accuracy of the system, reduces the difficulty of design process and adjustment of the system and also reduces the production cost of the system.
Description
Technical field
The present invention relates to a kind of photoelectricity computing machine, particularly a kind of optics vector-matrix multiplier system that forms based on the vertical cavity surface emitting laser member.
Background technology
Photometry calculates because advantages such as its concurrency, high information handling rate have obtained extensive studies.Wherein optics vector-matrix multiplier system is exactly a class of optical computer.This system can carry out the vector-matrix multiplication operation between extensive linear array and the face battle array.Its schematic diagram as shown in Figure 1.In this system, normal vertical cavity surface emitting laser (hereinafter to be referred as VCSEL) alignment or light emitting diode (LED) alignment of adopting is as input vector, the light of each light emitted is by an imaging system, become on the row pixel that a row illumination is mapped to corresponding Multiple Quantum Well spatial light modulator (modulation matrix), modulation through each pixel of modulator absorbs, the light intensity of each pixel reflects changes, and then through an imaging system, on the detector pixel of photoimaging to a correspondence that each row pixel reflects of modulator is returned, be detected device and absorb, obtain result of calculation.So just finished a vector-multiplication of matrices process.All there is a problem in VCSEL array commonly used at present: its polarization state changes with the increase of injection current, even if under onesize injection current, the polarization of VCSEL also randomized jitter can occur, the polarization noise of Here it is VCSEL, and its frequency is generally in the magnitude of hundred megahertzes.In carrying out calculation process, in order to reduce the noise that mirror surfaces comes back reflective to cause result of calculation is impacted, generally in system, can add an optical isolator (by the combination of a polarization splitting prism 5 and a quarter-wave plate 6).Like this in calculation process, even under same injection current drives, because polarization noise, the light intensity that shines modulator surface in each moment process polarization splitting prism beam split is later on all had any different, this calculates for the high speed optical that system carries out multi-grey level, is very disadvantageous.The polarized light light intensity of VCSEL emergent light is not a monotonically increasing relation (as shown in Figure 2) with the increase of injection current simultaneously, and this just can not satisfy the requirement that system carries out the multi-grey level computing.In order to reduce the influence of polarization noise, the Enlight256 optics vector of Israel Lenslet company-matrix multiplier system adopts two-way symmetrical beam calculation mode, its light path synoptic diagram is as shown in Figure 3: the light of light source 31 outgoing is through imaging system 34 shapings, then through polarization splitting prism 35 beam split, the two bundle polarized lights of telling become left-handed rotation (or right-handed rotation) through a quarter-wave plate 36 respectively and shine on the spatial light modulator 32, modulation through modulator absorbs, the light that each pixel reflects is returned is owing to there is half-wave loss, become right-handed rotation (or left-handed rotation), become the light of another polarization direction again through quarter-wave plate 36, propagate along another direction by polarization splitting prism 35 backs, collect by imaging system 37, pass through the polarization splitting prism beam split again, respectively the result of calculation of this two-way polarized light is surveyed with two detectors 33 at last, added then and obtain result of calculation.In this system, modulate calculating respectively by the two-way light that polarization splitting prism is told, the result is summed up compensate of the influence of VCSEL polarization noise instability then result of calculation.The shortcoming of this system design is: require the necessary strict symmetry of two-way light, under the situation of supercomputing, the light path of two-way light is wanted strict and is equated, and each passage pixel of two-way light will be distinguished definitely aligning, the parameters such as the index of modulation of two-way photosystem are identical, so just can not cause the error of calculation.This has just improved the difficulty of system design process and assemble and debugging greatly.Therefore for to push optics vector-matrix multiplier system to practicality, the locking of VCSEL polarization is a key problem wherein needing solution badly.
Summary of the invention
For overcoming the deficiency of above-mentioned prior art optics vector-matrix multiplier, the object of the present invention is to provide a kind of optics vector-matrix multiplier based on stable polarized vertical cavity surface emitting laser, make the structure of optics vector-matrix multiplier system simplify more, computational accuracy improves more, can satisfy the multi-grey level computing, reduce processing, assembling and the debugging difficulty of this system simultaneously.
The technical scheme that realizes the invention described above is:
Optics vector-matrix multiplier based on vertical cavity surface emitting laser, comprise vertical cavity surface emitting laser as light source, and imaging system, polarization splitting prism, spatial light modulator, photo-detector and the quarter-wave plate of pressing certain space position and light path setting, it is characterized in that: the perforation hole place processing of described vertical cavity surface emitting laser is provided with a sub-wave length grating.
Further, aforementioned optics vector-matrix multiplier based on vertical cavity surface emitting laser, wherein this optics vector-matrix multiplier only has one tunnel imaging system, polarization splitting prism, spatial light modulator, photo-detector and the quarter-wave plate that is used for the optics computing.
The present invention is based on the optics vector-matrix multiplier system of stable polarized vertical wall emitting laser, remarkable advantage was after it was implemented:
The present invention just can realize the process of optics vector-matrix multiplication with one road polarized light, simplify the structure of system greatly, realized the calculating of multi-grey level, improved the precision of system-computed, simultaneously also reduce the process and assemble of system and the difficulty of debugging, reduced the production cost of system.This optics vector-matrix multiplier practice widely calculates the field at photoelectricity.
Following constipation closes the embodiment accompanying drawing, the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.
Description of drawings
Fig. 1 is the principle of work synoptic diagram of existing optics vector-matrix multiplier;
Fig. 2 is the polarized light light intensity of VCSEL emergent light in optics vector-matrix multiplier system of prior art VCSEL and the variation relation synoptic diagram between the injection current intensity;
Fig. 3 is the structural representation that prior art symmetric double light path realizes optics vector-matrix multiplier;
Fig. 4 is the structural representation of perforation hole sub-wave length grating of the optics vector-matrix multiplier of vertical cavity surface emitting laser of the present invention;
Fig. 5 is the structural representation that the present invention adopts the optics vector-matrix multiplier of vertical cavity surface emitting laser shown in Figure 4;
Fig. 6 is the polarized light light intensity of middle VCSEL light source emergent light embodiment illustrated in fig. 5 and the variation relation synoptic diagram between the injection current intensity;
The implication of each Reference numeral is as follows in the above-mentioned accompanying drawing:
31.VCSEL light source; 32. spatial light modulator; 33. detector; 34. imaging system; 35. polarization splitting prism; 36. quarter-wave plate; 37. imaging system;
61.VCSEL light source; 62. spatial light modulator; 63. detector; 64. imaging system; 65. polarization splitting prism; 66. quarter-wave plate; 67. imaging system.
Embodiment
For the application that makes optical computer is further deepened, the polarization stability problem that solves the VCSEL light source is an important key, just can finish computation process with one road polarized light simultaneously, thereby need not two-way light is modulated respectively, the structure of system also will be simplified greatly like this, computational accuracy improves more, can satisfy the multi-grey level computing, reduces processing, assembling and the debugging difficulty of this system simultaneously.
As shown in Figure 4, this VCSEL light source is used for optics vector-matrix multiplier and realizes that stable polarized approach is: by at VCSEL light source 61 perforation holes one sub-wave length grating being set.The effect of this sub-wave length grating is a polarization of stablizing the VCSEL light source, and what do not change simultaneously VCSEL again goes out the variation of firing association's light intensity with electric current.Be applied to optics vector-matrix multiplication system as light source, can well avoid under different current drives, VCSEL emergent light polarization problem of unstable has also satisfied when the multi-grey level computing simultaneously, is the monotonically increasing relation between VCSEL output intensity and the drive current.Its principle of work is as follows: sub-wave length grating just is equivalent to the reflection of a coupled outside device, when the illumination of VCSEL outgoing is mapped on the sub-wave length grating, because the variation that VCSEL outgoing polarisation of light is not stopping, so the polarisation of light of coupled outside device (sub-wave length grating just) reflected back also not stopping variation, has just formed the vibration of similar intra resonant cavity between sub-wave length grating and VCSEL perforation hole.Because the asymmetry of sub-wave length grating itself just can select the outgoing polarisation of light in certain specific polarization direction by sub-wave length grating, so the outgoing polarisation of light has just been realized stablizing by this structure.This VCSEL light source can the outgoing linearly polarized photon, its output intensity with the change trend curve of injection current as shown in Figure 6, it has preferable linear increment relation.
Be illustrated in figure 5 as the structural representation of a kind of optics vector-matrix multiplier based on vertical cavity surface emitting laser of the present invention.From this evolved the optics vector-the matrix multiplier system as seen, it each major function unit and prior art that comprises is basic identical, the light source 61, spatial light modulator 62, detector 63, imaging system 64 and 67, the polarization splitting prism 65 that promptly comprise vertical cavity surface emitting laser, quarter-wave plate 66.But as seen its property simplified from illustrating, and owing to the influence that need not consider the light source polarization noise, this multiplier system only need adopt to be stated device architectures on the way and just can finish vector-matrix multiplication process.
The principle of work of this optics vector-matrix multiplier is: the linearly polarized light of VCSEL light source 61 outgoing is through 64 pairs of beam shapings of an imaging system, through polarization splitting prism 65 beam split, a branch of polarized light of telling is through a quarter-wave plate 66, becoming left-handed rotation (or right-handed rotation) shines on the spatial light modulator 62, modulation through each pixel of modulator absorbs then, the light of reflected back is owing to there is half-wave loss, become right-handed rotation (or left-handed rotation), become the light of another polarization direction again through quarter-wave plate 66, propagate along another direction by polarization splitting prism 65 backs, pass through the shaping of imaging system 67 at last, shine on the respective pixel of detector 63 and obtain result of calculation.This multiplier system of the present invention is compared with the EnLight256 system, modulator, detector and quarter-wave plate all only need one, last polarization splitting prism also no longer needs, and no longer needs simultaneously the strict symmetry of two-way light, and the strict phase of light path or the like requirement.
The present invention is based on the optics vector-matrix multiplier of vertical cavity surface emitting laser, can realize effectively overcoming the optics vector-matrix multiplier calculating process of polarization noise with one road polarized light, simplified system architecture greatly, can realize the calculating of multi-grey level along light path; Also reduced the process and assemble and the debugging difficulty of system when having improved the system-computed precision, pushed practical application to for this optical computational system foundation is provided.
Claims (2)
1. based on optics vector-matrix multiplier of stable polarized VCSEL, comprise vertical cavity surface emitting laser as light source, and imaging system, polarization splitting prism, spatial light modulator, photo-detector and the quarter-wave plate of pressing certain space position and light path setting, it is characterized in that: the perforation hole place processing of described vertical cavity surface emitting laser is provided with a sub-wave length grating.
2. the optics vector-matrix multiplier based on stable polarized VCSEL according to claim 1 is characterized in that: described optics vector-matrix multiplier only has one tunnel imaging system, polarization splitting prism, spatial light modulator, photo-detector and the quarter-wave plate that is used for the optics computing.
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| CN 201010268625 CN101957629B (en) | 2010-08-31 | 2010-08-31 | Optical vector-matrix multiplier based on stable polarization VCSEL (Vertical Cavity Surface Emitting Laser) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436072A (en) * | 2011-12-30 | 2012-05-02 | 中国科学院苏州纳米技术与纳米仿生研究所 | Novel optical digital signal processing system |
| CN112799464A (en) * | 2021-04-01 | 2021-05-14 | 中国科学院西安光学精密机械研究所 | Matrix vector multiplier based on multi-wavelength light source and operation method thereof |
| CN116667123A (en) * | 2023-07-31 | 2023-08-29 | 中国科学院长春光学精密机械与物理研究所 | Chip-level vertical integrated passive Q-switched laser with polarization output characteristic |
-
2010
- 2010-08-31 CN CN 201010268625 patent/CN101957629B/en not_active Expired - Fee Related
Non-Patent Citations (3)
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| 《仪器仪表学报》 20061012 张锐等 光学向量矩阵乘法器的进展 第27卷, 第6期 * |
| 《大学物理》 20080815 李修建等 光学向量-矩阵乘法器教学演示实验 第27卷, 第08期 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436072A (en) * | 2011-12-30 | 2012-05-02 | 中国科学院苏州纳米技术与纳米仿生研究所 | Novel optical digital signal processing system |
| CN112799464A (en) * | 2021-04-01 | 2021-05-14 | 中国科学院西安光学精密机械研究所 | Matrix vector multiplier based on multi-wavelength light source and operation method thereof |
| CN116667123A (en) * | 2023-07-31 | 2023-08-29 | 中国科学院长春光学精密机械与物理研究所 | Chip-level vertical integrated passive Q-switched laser with polarization output characteristic |
| CN116667123B (en) * | 2023-07-31 | 2023-09-22 | 中国科学院长春光学精密机械与物理研究所 | Chip-level vertical integrated passive Q-switched laser with polarization output characteristic |
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