CN102445809B - Optical analog-digital converter quantification method based on photonic crystal auto-collimation effect - Google Patents

Abstract

The invention discloses a method for quantizing an optical analog-to-digital converter based on the self-collimation effect of photonic crystals. The method includes: filling a filling medium in a two-dimensional dielectric substrate, and introducing another regular triangular lattice into the dielectric substrate. A filling medium forms a photonic crystal self-collimation structure; the low point and high point of the transmittance are determined according to the transmission spectrum of the photonic crystal self-collimation structure, and the logic state is determined as 0 or 1 to realize quantization. The invention effectively avoids the loss caused by the traditional line defects of photonic crystals, is beneficial to realize the miniaturization, low loss and integration of devices, and will promote the practical process of optical analog-to-digital converters in high-speed integrated information technology , has far-reaching significance to the development of information technology.

Description

Quantification method of optical analog-to-digital converter based on photonic crystal self-collimation effect

technical field

The invention relates to the technical field of optical analog-to-digital converters, in particular to an optical analog-to-digital converter quantization method based on photonic crystal self-collimation effect.

Background technique

Analog-to-digital converters are a key component of many information processing systems. With the rapid development of information technology integration and high speed, low-loss, high-slew rate, high-bit-precision micro-nano optical analog-to-digital converters have become a development trend. Electronic analog-to-digital converters Converters have become the bottleneck factor between analog signal and digital processing systems. The technology of analog-to-digital conversion using photonics method has extremely high bandwidth, and can directly sample and quantize ultra-wideband analog electrical or optical signals. Among them, the quantization technology is the key technology of the optical analog-to-digital converter.

Photonic crystal is an artificial dielectric structure with periodic distribution of refractive index. The self-collimation effect is a new feature discovered in photonic crystals in recent years. It can make the light beam overcome the diffraction and divergence effect and propagate in a straight line, and has the advantages of low-cost and high-integration technology. It has broad applications in optical interconnection and optical integration. application prospects.

Compared with conventional line-defect photonic crystal waveguides, the self-collimation effect has obvious advantages. First of all, the self-collimation mode is in the conduction band, so it has a larger group velocity and faster propagation speed; secondly, compared with the photonic crystal device based on the defect mode, the optical device based on the self-collimation effect has higher requirements on process precision. It is not high, so it is more suitable for process realization. Therefore, the technological advantage of the self-collimation effect has important practical value for the manufacture of highly integrated and low-cost integrated optical circuits.

Contents of the invention

(1) Technical problems to be solved

In view of this, the main purpose of the present invention is to provide a quantization method for an optical analog-to-digital converter based on the photonic crystal self-collimation effect.

(2) Technical solution

In order to achieve the above object, the present invention provides a method for quantifying an optical analog-to-digital converter based on the photonic crystal self-collimation effect, the method comprising:

Filling a two-dimensional dielectric substrate with a filling medium, and introducing another filling medium with a regular triangular lattice on the dielectric substrate to form a photonic crystal self-alignment structure;

The low point and high point of the transmittance are determined according to the transmission spectrum of the self-collimating structure of the photonic crystal, and it is judged as logic state 0 or 1 to realize quantization.

In the above scheme, filling a filling medium in the two-dimensional dielectric substrate, and introducing another filling medium of a regular triangular lattice on the dielectric substrate to form a photonic crystal self-alignment structure specifically includes:

Filling the first filling medium in the two-dimensional dielectric substrate, and introducing the second filling medium of the regular triangular lattice on the dielectric substrate to form a photonic crystal self-alignment structure;

an optical signal is incident on the photonic crystal self-collimation structure at a self-collimation frequency, and the self-collimation frequency is determined by the refractive index, lattice period and filling ratio of the photonic crystal self-collimation structure;

The transmission spectrum of the self-collimated photonic crystal structure is analyzed, the parameters of the photonic crystal structure are adjusted, and the photonic crystal self-collimation structure with relatively stable transmission spectrum is further selected.

In the above scheme, the two-dimensional dielectric substrate and the first filling medium are arbitrary media, and the difference between the two refractive indices must be greater than 0.5.

In the above solution, the first filling medium adopts structural units of any regular shape.

In the above solution, the second filling medium is a filling medium having a medium unit of a regular triangular lattice structure.

(3) Beneficial effects

As can be seen from the foregoing technical solutions, the present invention has the following beneficial effects:

The optical analog-to-digital conversion quantization method based on the photonic crystal self-collimation effect provided by the present invention effectively avoids the loss caused by the traditional line defect of the photonic crystal, is beneficial to realize the miniaturization, low loss and integration of the device, and will promote the optical The practical process of analog-to-digital converters in high-speed integrated information technology has far-reaching significance for the development of information technology.

Description of drawings

Fig. 1 is a flow chart of the optical analog-to-digital conversion quantification method based on photonic crystal self-collimation effect provided by the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The core idea of the present invention is: fill the first filling medium in the two-dimensional dielectric substrate, and introduce the second filling medium of the regular triangular lattice on the dielectric substrate, wherein the two-dimensional dielectric substrate and the first filling medium are any medium and The refractive index difference between the dielectric substrate and the first filling medium is greater than 0.5, and the units of the first filling medium are in any regular shape. The optical signal is incident on the self-collimating structure of the photonic crystal at the self-collimating frequency. The self-collimation frequency is determined by the refractive index, lattice period and filling ratio of the photonic crystal self-collimation structure. By analyzing the transmission spectrum of the self-collimating photonic crystal structure, adjusting the parameters of the photonic crystal structure, and further selecting the self-collimating structure of the photonic crystal with a relatively stable transmission spectrum, determining the low point and high point of the transmittance according to the transmission spectrum, and determining the realization of the logic state Quantify.

As shown in Figure 1, Figure 1 is a flow chart of the optical analog-to-digital conversion quantification method based on the photonic crystal self-collimation effect provided by the present invention, and the method includes the following steps:

Step 101: Filling a two-dimensional dielectric substrate with a filling medium, and introducing another filling medium of a regular triangular lattice on the dielectric substrate to form a photonic crystal self-alignment structure;

Step 102: Determine the low point and high point of the transmittance according to the transmission spectrum of the photonic crystal self-collimation structure, determine the logic state as 0 or 1, and realize quantization.

Wherein, as described in step 101, a filling medium is filled in the two-dimensional dielectric substrate, and another filling medium of a regular triangular lattice is introduced on the dielectric substrate to form a photonic crystal self-alignment structure, which specifically includes: The dielectric substrate is filled with the first filling medium, and the second filling medium of the regular triangular lattice is introduced on the dielectric substrate to form a photonic crystal self-collimation structure; an optical signal is incident on the photonic crystal self-collimation structure at a self-collimation frequency , the self-collimation frequency is determined by the refractive index, lattice period and filling ratio of the photonic crystal self-collimation structure; analyze the transmission spectrum of the self-collimation photonic crystal structure, adjust the photonic crystal structure parameters, and further select the transmission spectrum for comparison Stable photonic crystal self-collimation structure.

Example

Air square holes with regular triangular lattices are introduced on the two-dimensional silicon-based flat plate. The side length of the air square holes in the photonic crystal self-collimation structure is b, and d is the lattice constant. Among them, the values of b and d determine the self-collimation The value of the frequency f. The optical signal is incident on the photonic crystal self-collimation structure at the self-collimation frequency f, by analyzing the transmission spectrum of the self-collimation photonic crystal structure, adjusting the photonic crystal structure parameters b and d, and further selecting the photonic crystal self-collimation with relatively stable transmission spectrum Direct structural parameters b and d, determine the low point and high point of the transmittance according to the transmission spectrum, and determine the logic state "0" or "1" to achieve quantification.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. a kind of optical analog-to-digital converter quantization method based on photonic crystal self-collimation effect, it is characterized in that, the method comprises: Filling a two-dimensional dielectric substrate with a filling medium, and introducing another filling medium with a regular triangular lattice on the dielectric substrate to form a photonic crystal self-alignment structure; The low point and high point of the transmittance are determined according to the transmission spectrum of the self-collimating structure of the photonic crystal, and it is judged as logic state 0 or 1 to realize quantization. 2. the optical analog-to-digital converter quantification method based on photonic crystal self-collimation effect according to claim 1, is characterized in that, described filling a kind of filling medium in two-dimensional dielectric substrate, and introducing positive Another filling medium for the triangular lattice, after forming the photonic crystal self-alignment structure, and determining the low point and high point of the transmittance according to the transmission spectrum of the photonic crystal self-alignment structure, it is judged as logic state 0 or 1. Before realizing quantification, it also includes: an optical signal is incident on the photonic crystal self-collimation structure at a self-collimation frequency, and the self-collimation frequency is determined by the refractive index, lattice period and filling ratio of the photonic crystal self-collimation structure; The transmission spectrum of the self-collimated photonic crystal structure is analyzed, the parameters of the photonic crystal structure are adjusted, and the photonic crystal self-collimation structure with relatively stable transmission spectrum is further selected. 3. the optical analog-to-digital converter quantification method based on photonic crystal self-collimation effect according to claim 2, is characterized in that, described two-dimensional dielectric substrate and the first filling medium are arbitrary mediums, the difference between the refractive index of the two The difference must be greater than 0.5. 4. The optical analog-to-digital converter quantification method based on photonic crystal self-collimation effect according to claim 2, characterized in that, the first filling medium adopts structural units of any regular shape. 5. The optical analog-to-digital converter quantization method based on photonic crystal self-collimation effect according to claim 2, characterized in that, the second filling medium is a filling medium having a regular triangular lattice structure medium unit.

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