KR100812908B1 - Optical information prcessing appratus and optical information prcessing method - Google Patents

Abstract

A device and a method for processing optical information are provided to overlap optical information by setting time schedule in forming a recording area on a recording medium. A method for processing optical information comprises the steps of: overlapping optical information for setting in a storage medium by illuminating an information beam for setting and a reference beam(S100); measuring diffraction efficiency of the optical information by reproducing the overlapped optical information(S120); drawing plural linear equations of more than n-th order(n is an integer more than 1) by using an accumulation value of the diffraction efficiency; and setting time schedule by using the linear equations(S150). The strength of the optical energy in the reference beam for setting is increased by increasing the frequency of overlapping record in recording the optical information.

Description

Optical information processing device and optical information processing method {Optical information prcessing appratus and optical information prcessing method}

1 is a flowchart illustrating a method of setting time scheduling of optical information according to an exemplary embodiment of the present invention.

2 is a cumulative graph of discrete optical information diffraction efficiency values according to light irradiation energy.

3 is a graph showing the graph of FIG. 2 by applying the sixth to tenth order polynomials.

FIG. 4A is a graph illustrating a conversion of the light irradiation energy axis of FIG. 3 to a time axis.

4B is an enlarged graph of region A of FIG. 4A.

5A is a graph obtained by reconstructing the average of the graphs of FIG. 3.

FIG. 5B is an enlarged graph of region B of FIG. 5A.

6 is a simplified diagram showing an optical information processing apparatus according to an embodiment of the present invention.

7 is a flowchart showing an optical information recording method according to an embodiment of the present invention.

8 is a flowchart illustrating a method of reproducing optical information according to an embodiment of the present invention.

The present invention relates to an optical information processing apparatus and a processing method. More particularly, when a recording area is formed on a storage medium by angular multiplexing, a time schedule is set so that optical information is superimposed and the same diffraction efficiency is reproduced when the overlapping optical information is reproduced. It relates to an optical information processing apparatus and a processing method to have a.

With the development of the multimedia industry and the telecommunications industry, the modern society has increased the amount of information exponentially, and the interest in the production technology and information processing technology of ultra-large capacity, ultra-high speed, and miniaturization that can accommodate high-capacity information is emerging. .

Among these technologies, optical information processing technology is applied to integrated optics, optical computer, optical memory, optical exchange, etc. Among the optical information processing technology, holographic information processing technology continuously meets the requirements of miniaturization, low cost, simplicity, and multifunction. Is being developed. Storage media using tapestry holographic memory technology is coming soon.

Since a holographic storage medium superimposes and records a plurality of information pages stored as a holographic image in a storage medium in a volume form, the storage capacity is large and data can be spatially stored using a multiplexing method.

Multiplexing methods include Angle Multiplexing, Phase-code Multiplexing, Wavelength Multiplexing, Shift Multiplexing, Fractal Multiplexing, Peristrophic Multiplexing, Polytopic multiplexing, and the like.

In the case of forming a recording area using the angle multiplexing method among these multiplexing methods, diffraction efficiency decreases as data overlaps because multiple data pages are stored by irradiating various angles in one recording area to increase recording density. The prior art for preventing the variation of the diffraction efficiency is the "diffraction efficiency equalization method of the volume holographic digital data storage system" of the Korean Patent Publication "10-1999-0042796".

In the case of the disclosed patent, the recording time is set by varying the recording time according to the number of times overlapping the same recording area of the storage medium and the incident angle of the reference light. By setting the difference at the recording time in this way and recording the optical information, the variation of the diffraction efficiency can be reduced and the reproduction efficiency can be improved. However, even in most angular multiplexing recording methods, it is difficult to set the correct time according to the number of times of overlapping optical information because the recording material is erased and the angle is dependent, so that the diffraction efficiency is not the same.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention relates to an optical information processing apparatus and a processing method for setting and recording and reproducing a time schedule when overlapping optical information using an angular multiplexing method.

The optical information processing time scheduling method according to the present invention for achieving the above object is a step of inputting the setting signal light and the setting reference light to the storage medium to superimpose the setting optical information, the reproduction of the superimposed setting optical information Measuring and accumulating the diffraction efficiency of the optical information; deriving a plurality of linear equations of order n or more (n is an integer of 1 or more) using the cumulative value of the diffraction efficiency; and time schedule using the linear equation. It includes the step of setting.

The plurality of linear equations of the nth order or more are polynomials of the sixth to tenth order, and the time schedule may be set by obtaining an average of the polynomials of the sixth to tenth order.

As the number of superimposed recordings increases when recording the setting light information, the light energy intensity of the setting reference light may be increased and irradiated.

The setting of the time schedule may be derived by dividing the light energy intensity of the reference light derived from the linear equation by the set power.

The light energy intensity of the setting reference light may increase as the light irradiation time becomes longer.

In the optical information recording method according to the present invention for achieving the above object, the step of inputting the setting signal light and the setting reference light to the storage medium to superimpose the setting optical information, by reproducing the overlapping setting optical information Measuring and accumulating the diffraction efficiency of the information; equalizing the cumulative value from a plurality of linear equations of order n or more (n is an integer of 1 or more) using the cumulative value of the diffraction efficiency; and using the leveled cumulative value And setting a time schedule, and inputting the recording reference light and the recording signal light according to the set time schedule to superimpose the optical information.

As the number of times of overlapping recording is increased while overlapping the optical information, the optical energy intensity of the recording reference light may be increased and irradiated.

The light energy intensity of the recording reference light may increase as the light irradiation time becomes longer.

The optical information reproducing method according to the present invention for achieving the above object is a step of inputting the setting signal light and the setting reference light to the storage medium to superimpose the setting optical information, by reproducing the overlapping dummy optical information Measuring and accumulating the diffraction efficiency of the information; equalizing the cumulative value from a plurality of linear equations of order n or more (n is an integer of 1 or more) using the cumulative value of the diffraction efficiency; and using the leveled cumulative value Setting a time schedule, inputting a recording reference light and a recording signal light according to the set time schedule, and superimposing optical information; and inputting a reproduction reference light into the optical information overlapping recording area to overlap the overlapping optical information. Playing a step.

An optical information processing apparatus according to the present invention for achieving the above object is a light source, an optical splitter for separating the light emitted from the light source into a reference light and a signal light, an optical modulator for loading data into the signal light, interference of the reference light and the signal light And a detector configured to detect the optical information from a storage medium on which the optical information is recorded, to analyze the diffraction efficiency of the optical information, to set a time schedule, and to adjust the light energy intensity according to the time schedule set by the detector. .

It may be provided with a shutter for adjusting the light energy intensity.

The controller may control the light irradiation time of the light source to adjust the light energy intensity.

Hereinafter, an optical information processing apparatus and a processing method according to an embodiment of the present invention will be described with reference to the drawings.

1 is a flowchart illustrating a method of setting time scheduling of optical information according to an exemplary embodiment of the present invention.

First, the setting signal light is incident on the recording area of the storage medium, the setting reference light is incident on the angle multiplexing method, and the setting optical information for setting the time schedule is superimposed and recorded. At this time, the light energy is gradually increased by increasing the incident time of light in the superimposed recording order (S100).

The reason for irradiating light with increasing optical energy is that the recording efficiency of optical information is reduced as the number of overlapping recording times of overlapping optical information increases. Therefore, by inputting the reference light for a longer time, the recording efficiency of the optical information is improved. The incident time of the reference light is proportional to the number of superimposed writes, and as the number of superimposed writes increases, the incident time of the reference light becomes longer.

Subsequently, when the optical information is reproduced, only the reference light for setting is irradiated to the storage medium on which the setting optical information is recorded by the angle multiplexing method to reproduce the optical information (S110). The setting reference light to be irradiated is irradiated to the recording area in which the optical information is superimposed irrespective of the number of superimposed recordings.

At this time, since the overlapped optical information recorded the optical information while the irradiation time of the reference light was increased as the number of overlapping times increased, the diffraction efficiency of the overlapped oxygen could be improved. Therefore, when the reference light is irradiated to the overlapped recording areas during reproduction, similar reproduction efficiency can be obtained for each optical information.

In order to reproduce the optical information effectively, a predetermined time schedule is required at the time of recording the optical information. Therefore, by recording and reproducing the setting optical information, the diffraction efficiency of the optical information is detected, and an accurate time schedule is set using the detected diffraction efficiency value.

In other words, the time schedule is intended to keep their reproduction efficiency as uniform as possible when reproducing all the superposed optical information. If the reproduction efficiency of the optical information is changed for each of the superposed recorded optical information, the optical information detector may not be able to efficiently decode the optical information of the reproduced light, so a set time schedule for recording the optical information is required.

 The time schedule may be calculated and set by the cumulative graph shown in FIG. 2 in which the diffraction efficiency of the optical information according to the intensity of the light energy irradiated at the time of accumulation is accumulated (S120). Before this calculation process, it is necessary to find an equation that can be established by substituting discrete cumulative data values of optical information diffraction efficiency according to optical energy intensity. The graph of the equation obtained by the curve is shown in FIG. 3. When the equation is obtained and represented by the curve, an even distribution of the diffraction efficiency and continuous data according to the intensity of the light energy can be obtained and a more accurate time schedule can be set.

The expression needed to plot discrete cumulative data values into a curve is

=++++++++

= ++++++++

to be. The polynomial is a linear equation for obtaining an approximate curve using coordinates.

=++++

= ++++

는 회절효율의 누적값 즉 도 2에서의 Y좌표값을 의미하고,

는 조사되는 광에너지 즉 Y좌표값에 대한 X좌표값을 의미한다. Same form as In Equation 1

Is the cumulative value of the diffraction efficiency, that is, the Y coordinate value in FIG.

Denotes the X energy value of the irradiated light energy, that is, the Y coordinate value.

의 계수를 구할 수 있다. 이렇게

의 계수를 구하여 식을 도출하면 이산된 데이터들을 이어주는 곡선의 식이 완성된다. As shown in FIG. 2, data of an optical information diffraction efficiency cumulative graph according to the recorded optical energy intensity are read in ordered pairs and substituted into Equation 1

The coefficient of can be found. like this

Deriving the equation by calculating the coefficient of, completes the equation of the curve connecting the discrete data.

3 is a graph reconstructed from the sixth order polynomial to the tenth order polynomial to the completed equation. 3 is a graph in which data is arranged so that FIG. 2 may have continuous data, and as in the graph of FIG. 2, the Y axis is a cumulative value of diffraction efficiency detected when optical information is sequentially reproduced in a recording area in which optical information is overlapped. , X-axis means the light energy intensity for irradiating the optical information to the overlapping proxy recording area.

Therefore, when the cumulative diffraction efficiency value of the Y coordinate according to the overlapped number as shown in FIG. 2 can be read, the irradiation energy of the diffraction efficiency accumulated value, that is, the X coordinate can be read. In addition, by dividing the X coordinate value by an arbitrary power set in the optical information processing apparatus, it is possible to derive the light irradiation time with respect to the number of times of overlapping recording according to the formula of electric energy.

4A shows the graph by deriving the light irradiation time according to the number of times of overlapping recording of the optical information. As shown in the graphs shown in FIG. 4A, it can be seen that as the number of superimposed recordings increases, the recording time increases so that the diffraction efficiency of the reproduced optical information does not drop and is constant.

However, in FIG. 4B in which the specific area A shown in FIG. 4A is enlarged, it can be observed that the graph using the sixth order polynomial becomes shorter as the number of times of overlapping recording increases. Based on the experimental data, it seems difficult to set a stable time schedule with the sixth order polynomial.

Therefore, to compensate for this, the data that can be omitted from the original cumulative graph are supplemented by using a plurality of polynomials having multiple orders instead of one polynomial, and the average of the plurality of polynomials is obtained to obtain a stable data value.

Subsequently, in order to obtain stable data values, seventh, eighth, ninth, and tenth polynomials are applied (S130) to obtain continuous data, and the average of the data values and the sixth order polynomials are calculated (S140). ).

After calculating the light irradiation time according to the number of times of overlapping recording using the averaged data value, a much more stable time schedule can be set (S150). 5A shows a graph of light irradiation energy according to the number of overlapping recordings expressed as an average value and a light irradiation energy graph according to the number of overlapping recordings indicated by applying a sixth order polynomial.

In the graph of FIG. 5B in which the area B of the special area of FIG. 5A is enlarged, the cumulative graph in which the diffraction efficiency of light information according to the original light irradiation energy is accumulated is the sixth and seventh order than the graph shown by applying the sixth order polynomial. By applying the 8th, 9th, and 10th polynomials, we can observe that the graph is more consistent with the graph reconstructed as the mean value.

This time scheduling method can be applied to a holographic optical processing apparatus. The holographic light processing apparatus includes a holographic recording and reproducing apparatus, a holographic ROM system, a holographic imaging apparatus, a volume holographic apparatus, and the like.

Hereinafter, an embodiment of a holographic optical information processing apparatus employing a time scheduling method according to an embodiment of the present invention will be described.

6 is a simplified diagram showing an optical information processing apparatus according to an embodiment of the present invention. As shown in FIG. 6, the optical information processing apparatus includes a light source 100 that emits light, and the light emitted from the light source 100 is separated into a signal light and a reference light by the light splitter 110.

The light splitter 110 is a polarized light splitter that transmits signal light of horizontal polarization (S-Polarization) in a 90 degree direction and transmits reference light of vertical polarization (P-Polarization) in a linear direction. The reference light separated by the light splitter 110 is reflected by the rotation mirror 120 that is adjusted at multiple angles and is incident to the storage medium 200. The rotating mirror 120 used at this time may use a galvano mirror.

Subsequently, the signal light transmitted by the light splitter 110 in the 90 degree direction is reflected by the reflecting mirror 130 and directed to the light expander 150. The optical expander 150 expands the light so that the signal light can load data from the optical modulator 160. A shutter 140 is provided between the optical expander 150 and the reflection mirror 130 and is opened when optical information is recorded to pass the signal light, and is shielded when optical information is reproduced to block the signal light.

Thereafter, the signal light loaded with the optical information data in the optical modulator passes through the lenses 170a and 170b and the filter 180 to be directed to the λ / 4 polarizing plate 190. The filter 180 removes spike noise from the light passing through the lens 170a to form light having a flat intensity distribution. Subsequently, the signal light passing through the λ / 4 polarizing plate 190 is converted into P-polarized light, and is Fourier-converted by the Fourier transform lens 200 to be incident on the storage medium 210.

When the optical information is reproduced, the signal light is blocked by the shutter 140, and only the reference light is irradiated to enter the storage medium 210. The optical information reproduced by the storage medium 210 is incident to the optical information detector 230 through the objective lens 220, and the optical information detector 230 detects the optical information. As the optical information detector 230, a charge coupled device (CCD), a complementary metal-oxide semiconductor (CMOS), or the like may be used.

Subsequently, when the optical information overlapping recording time is set according to the optical information detected by the optical information detector 230, that is, the reproduced optical information, the control unit 240 adjusts the light irradiation time of the light source 100 according to the set time schedule. By adjusting or adjusting the opening and closing time of the shutter 140 to adjust the intensity of the light energy.

7 is a flowchart showing an optical information recording method according to an embodiment of the present invention.

First, the setting signal light is incident on the recording area of the storage medium 210, the setting reference light is incident on the angle multiplexing method, and the setting optical information is superimposed and recorded. At this time, by increasing the incident time of the light in the superimposed recording order, the light energy is gradually increased and recorded (S200).

Thereafter, the setting reference light is irradiated to the recording area of the storage medium 210 in which the setting optical information is recorded to reproduce the optical information (S210). The optical information continuously reproduced is diffracted by the optical information detector 230 (S220), and the time schedule is set to a data value averaged (S240) by applying a polynomial equation (S230) from 6th to 10th order (S230). (S250).

When the time schedule is set, the control unit 240 adjusts the time of the light emitted from the light source 100 or the opening / closing time of the shutter 140 to adjust the intensity of the light energy irradiated to the storage medium 210 and overlaps. Optical information is recorded according to a time schedule set according to the recording frequency (S260).

8 is a flowchart illustrating a method of reproducing optical information according to an embodiment of the present invention.

First, the setting signal light is incident on the recording area of the storage medium 210, and the setting reference light is incident on the angle multiplexing method, and the setting light information is overlapped and recorded. At this time, the light energy is gradually increased by increasing the incident time of light in the superimposed recording order (S300).

Thereafter, the setting reference light is incident on the recording area of the storage medium 210 in which the setting optical information is recorded, and the optical information is reproduced (S310). Then, the optical information detector 230 detects the reproduced optical information, accumulates the diffraction efficiency of the optical information (S320), and applies a polynomial equation from the 6th to 10th order (S330) to obtain an average (S340). Set a time schedule (S350).

When the time schedule is set, the time of light emitted from the light source 100 is controlled by the controller 240 or the opening / closing time of the shutter 140 is adjusted to adjust the intensity of light energy irradiated to the storage medium 210. The data is recorded according to the set time schedule according to the number of overlapping recording times (S360).

Subsequently, the reference information irradiated with the same time for each optical information is incident on the recording area of the superimposed recording medium 210 according to the set time schedule, and the optical information is reproduced (S370).

In the optical information processing apparatus and processing method according to the present invention as described above, the average data is obtained using a plurality of linear equations, the time schedule is set as the average data, and the number of times of overlapping recording information is increased according to the time schedule. The longer the recording time is, the more effective the prevention of recording efficiency of optical information falling in the overlapping oxyphore is obtained, and the diffraction efficiency of optical information is increased during reproduction, thereby obtaining a uniform diffraction efficiency for each optical information.

Claims (12)

Injecting the setting signal light and the setting reference light into the storage medium to superimpose the setting light information; Reproducing the overlapping setting optical information to measure and accumulate diffraction efficiency of the optical information; Deriving a plurality of linear equations of order n or more (n is an integer of 1 or more) using the accumulated value of the diffraction efficiency; And And setting a time schedule using the linear equation. The optical information processing time of claim 1, wherein the plurality of linear equations of the nth order or more are polynomials of the sixth to tenth order, and a time schedule is set by obtaining an average of the polynomials of the sixth to tenth order. Scheduling Method. The optical information processing time scheduling method according to claim 1, wherein the recording time of the setting optical information increases and increases the light energy intensity of the setting reference light as the number of overlapping recordings increases. The method of claim 1, wherein the setting of the time schedule is performed by dividing the optical energy intensity of the reference light derived from the linear equation by the set power. 4. The method of claim 3, wherein the light energy intensity of the setting reference light increases as the light irradiation time increases. Injecting the setting signal light and the setting reference light into the storage medium to superimpose the setting light information; Reproducing the overlapping setting optical information to measure and accumulate diffraction efficiency of the optical information; Leveling the cumulative value from a plurality of linear equations of order n or more (n is an integer of 1 or more) using the cumulative value of the diffraction efficiency; Setting a time schedule using the leveled cumulative value; And And recording the optical information by overlapping the optical information by entering the recording reference light and the recording signal light according to the set time schedule. 7. The optical information recording method according to claim 6, wherein the optical information is irradiated while the optical information is overlapped and the optical energy intensity of the recording reference light is increased and irradiated as the number of times of overlapping recording is increased. 8. The optical information recording method according to claim 7, wherein the optical energy intensity of the recording reference light increases as the light irradiation time becomes longer. Injecting the setting signal light and the setting reference light into the storage medium to superimpose the setting light information; Reproducing the overlapping setting optical information to measure and accumulate diffraction efficiency of the optical information; Leveling the cumulative value from a plurality of linear equations of order n or more (n is an integer of 1 or more) using the cumulative value of the diffraction efficiency; Setting a time schedule using the leveled cumulative value; Injecting the recording reference light and the recording signal light according to the set time schedule and superposing the optical information thereon; And And reproducing superimposed optical information by applying a reproduction reference light to the optical information superimposed recording region. delete delete delete

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