CN102445809B - Quantitative method for optical analog-to-digital converter based on photonic crystal self-alignment effect - Google Patents
Quantitative method for optical analog-to-digital converter based on photonic crystal self-alignment effect Download PDFInfo
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- CN102445809B CN102445809B CN 201010504162 CN201010504162A CN102445809B CN 102445809 B CN102445809 B CN 102445809B CN 201010504162 CN201010504162 CN 201010504162 CN 201010504162 A CN201010504162 A CN 201010504162A CN 102445809 B CN102445809 B CN 102445809B
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Abstract
The invention discloses a quantitative method for an optical analog-to-digital converter based on a photonic crystal self-alignment effect. The method comprises the following steps of: filling a filling medium in a two-dimensional medium substrate, and introducing another filling medium of a regular triangle lattice on the medium substrate to form a photonic crystal self-alignment structure; determining a low point and a high point of transmissivity according to a transmission spectrum of the photonic crystal self-alignment structure, judging the low point and the high point to be in a logic state 0 or 1 to achieve quantization. The quantitative method for the optical analog-to-digital converter is used to effectively avoid the loss which is generated by the defects of a photonic crystal traditional line for the benefit of achieving micro-miniaturization, low loss and integration of the apparatus, so that a practical process of the optical analog-to-digital converter in high-speed integration information technology is impelled to have profound significance to the development of the information technology.
Description
Technical field
The present invention relates to optical mode number converter technical field, relate in particular to a kind of optical mode number converter quantization method based on photon crystal self-aligning effect.
Background technology
Analog to digital converter is the key components of many information handling systems, the fast development of and high speed integrated along with infotech, low-loss, high conversion rate, higher bit precision micro-nano optical mode number converter become development trend, and electronic analogue-to-digital converter has been the bottleneck factor between simulating signal and the digital processing system.Adopt the photonics method to realize analog-to-digital technology, have high bandwidth, can carry out Direct Sampling and quantification to ultra broadband analog electrical signal or light signal.Wherein, quantification technique is the gordian technique of optical mode number converter.
Photonic crystal is the artificial dielectric medium structure that a kind of refractive index is periodic distribution.Auto-collimation effect is the new features of finding in photonic crystal in recent years, and it can make light beam overcome the rectilinear propagation of diffraction effect weakening, and the process advantage with low cost, high integration, has broad application prospects at aspects such as light interconnection, light are integrated.
Compare with traditional line defect photon crystal wave-guide, auto-collimation effect has remarkable advantages.At first, the autocollimation mould is in the conduction band, thereby has bigger group velocity, and velocity of propagation is faster; Secondly, and compare based on the photon crystal device of defective mould, less demanding to craft precision based on the optical device of auto-collimation effect, thereby be more suitable for technology and realize.Therefore, the process advantage of auto-collimation effect to make high integration, integrated optical circuit has important practical value cheaply.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is to provide a kind of optical mode number converter quantization method based on photon crystal self-aligning effect.
(2) technical scheme
For achieving the above object, the invention provides a kind of optical mode number converter quantization method based on photon crystal self-aligning effect, this method comprises:
In the two-dimensional medium substrate, fill a kind of filled media, and introduce the another kind of filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure;
Determine low spot and the high point of transmissivity to be judged to be logic state 0 or 1 according to the transmission spectrum of this photon crystal self-aligning structure, realize quantizing.
In the such scheme, describedly in the two-dimensional medium substrate, fill a kind of filled media, and introduce the another kind of filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure, specifically comprise:
In the two-dimensional medium substrate, fill first filled media, and introduce second filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure;
Light signal is incident to this photon crystal self-aligning structure with the autocollimation frequency, and this autocollimation frequency is determined by refractive index, lattice period and the packing ratio of this photon crystal self-aligning structure;
Analyze the transmission spectrum of this autocollimation photon crystal structure, adjust the photon crystal structure parameter, further the selected more stable photon crystal self-aligning structure of transmission spectrum.
In the such scheme, described two-dimensional medium substrate and first filled media are arbitrary medium, and the difference of the refractive index of the two is greater than 0.5.
In the such scheme, described first filled media adopts the structural unit of any regular shape.
In the such scheme, described second filled media is the filled media with positive triangular crystal lattice structured media unit.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
Optical mode number conversion quantization method based on photon crystal self-aligning effect provided by the invention, the loss of having avoided photonic crystal traditional wire defective to produce effectively, be conducive to realize microminiaturization, the low-loss and integrated of device, and will advance the practicalization of optical mode number converter in the integrated infotech of high speed, the development of infotech is had profound significance.
Description of drawings
Fig. 1 is the optical mode number conversion quantization method process flow diagram based on photon crystal self-aligning effect provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Core concept of the present invention is: fill first filled media in the two-dimensional medium substrate, and introduce second filled media of positive triangular crystal lattice at medium substrate, wherein, two-dimensional medium substrate and first filled media are that the refringence of arbitrary medium and medium substrate and first filled media is greater than 0.5, and the unit of first filled media is the shape of any regular.Light signal is incident to the photon crystal self-aligning structure with the autocollimation frequency.The autocollimation frequency is determined by refractive index, lattice period and the packing ratio of photon crystal self-aligning structure.By analyzing the transmission spectrum of autocollimation photon crystal structure, adjust the photon crystal structure parameter, the further selected more stable photon crystal self-aligning structure of transmission spectrum is determined low spot and the high point of transmissivity according to transmission spectrum, the decision logic state is realized quantizing.
As shown in Figure 1, Fig. 1 is the optical mode number conversion quantization method process flow diagram based on photon crystal self-aligning effect provided by the invention, and this method may further comprise the steps:
Step 101: in the two-dimensional medium substrate, fill a kind of filled media, and introduce the another kind of filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure;
Step 102: determine low spot and the high point of transmissivity to be judged to be logic state 0 or 1 according to the transmission spectrum of this photon crystal self-aligning structure, realize quantizing.
Wherein, in the two-dimensional medium substrate, fill a kind of filled media described in the step 101, and introduce the another kind of filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure, specifically comprise: in the two-dimensional medium substrate, fill first filled media, and introduce second filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure; Light signal is incident to this photon crystal self-aligning structure with the autocollimation frequency, and this autocollimation frequency is determined by refractive index, lattice period and the packing ratio of this photon crystal self-aligning structure; Analyze the transmission spectrum of this autocollimation photon crystal structure, adjust the photon crystal structure parameter, further the selected more stable photon crystal self-aligning structure of transmission spectrum.
Embodiment
At the air square hole of the positive triangular crystal lattice of the silica-based flat board introducing of two dimension, the air square hole length of side of photon crystal self-aligning structure is b, and d is grating constant, and wherein, the value of b and d is determined the value of autocollimation frequency f.Light signal is incident to the photon crystal self-aligning structure with the autocollimation frequency f, by analyzing the transmission spectrum of autocollimation photon crystal structure, adjust photon crystal structure parameter b and d, further selected more stable photon crystal self-aligning structural parameters b and the d of transmission spectrum, determine low spot and the high point of transmissivity according to transmission spectrum, be judged to be logic state " 0 " or " 1 " and realize quantizing.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. optical mode number converter quantization method based on photon crystal self-aligning effect is characterized in that this method comprises:
In the two-dimensional medium substrate, fill a kind of filled media, and introduce the another kind of filled media of positive triangular crystal lattice at medium substrate, form the photon crystal self-aligning structure;
Determine low spot and the high point of transmissivity to be judged to be logic state 0 or 1 according to the transmission spectrum of this photon crystal self-aligning structure, realize quantizing.
2. the optical mode number converter quantization method based on photon crystal self-aligning effect according to claim 1, it is characterized in that, describedly in the two-dimensional medium substrate, fill a kind of filled media, and introduce the another kind of filled media of positive triangular crystal lattice at medium substrate, form after the photon crystal self-aligning structure, and determine low spot and the high point of transmissivity to be judged to be logic state 0 or 1 at described transmission spectrum according to this photon crystal self-aligning structure, before realizing quantizing, also comprise:
Light signal is incident to this photon crystal self-aligning structure with the autocollimation frequency, and this autocollimation frequency is determined by refractive index, lattice period and the packing ratio of this photon crystal self-aligning structure;
Analyze the transmission spectrum of this autocollimation photon crystal structure, adjust the photon crystal structure parameter, further the selected more stable photon crystal self-aligning structure of transmission spectrum.
3. the optical mode number converter quantization method based on photon crystal self-aligning effect according to claim 2 is characterized in that described two-dimensional medium substrate and first filled media are arbitrary medium, and the difference of the refractive index of the two is greater than 0.5.
4. the optical mode number converter quantization method based on photon crystal self-aligning effect according to claim 2 is characterized in that, described first filled media adopts the structural unit of any regular shape.
5. the optical mode number converter quantization method based on photon crystal self-aligning effect according to claim 2 is characterized in that, described second filled media is the filled media with positive triangular crystal lattice structured media unit.
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| CN105425504A (en) * | 2015-12-23 | 2016-03-23 | 山东大学 | Two-dimensional photonic crystal logic OR gate based on auto-collimation interference effect |
| CN105404075A (en) * | 2015-12-23 | 2016-03-16 | 山东大学 | Auto-collimation interference effect based two-dimensional photonic crystal logic inverter |
| CN105404074B (en) * | 2015-12-23 | 2018-10-23 | 山东大学 | 2 D photon crystal logical AND gate based on auto-collimation interference effect |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290455A (en) * | 2008-06-03 | 2008-10-22 | 电子科技大学 | All-light analog-digital converter NSX parallel quantitative coding method |
| CN101592761A (en) * | 2009-07-01 | 2009-12-02 | 江苏大学 | A kind of broadband mode converter based on the asymmetric double core photonic crystal fiber |
| CN101676787A (en) * | 2008-09-17 | 2010-03-24 | 中国科学院半导体研究所 | Optical pulse time domain broadening analog-to-digital converter |
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| US7212140B2 (en) * | 2002-11-26 | 2007-05-01 | Lockheed Martin Corporation | Photonic analog-to-digital converters using photonic crystals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101290455A (en) * | 2008-06-03 | 2008-10-22 | 电子科技大学 | All-light analog-digital converter NSX parallel quantitative coding method |
| CN101676787A (en) * | 2008-09-17 | 2010-03-24 | 中国科学院半导体研究所 | Optical pulse time domain broadening analog-to-digital converter |
| CN101592761A (en) * | 2009-07-01 | 2009-12-02 | 江苏大学 | A kind of broadband mode converter based on the asymmetric double core photonic crystal fiber |
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