The method of modeling a signal read from the optical disk

 

The invention relates to storage media, and more particularly to optical disks, and can be used in modeling and analysis of operation of optical systems for reading information from a digital optical disks. According to the proposed method write to a database ranges of values of the initial parameters of the optical disk and information elements of the recording layer, select from the database the original settings of the optical disc and information elements from the group consisting of grooves, pits and marks on the outer surface of the recording layer and the labels on the bottom of the grooves on the developed analytical formulas quickly and accurately determine the signal laser radiation reflected from the disk with the information elements of the recording layer and difragirovavshej on the spatial structure of the information elements of the recording layer, and find the signal read from the optical disk, by calculating the full intensity of the reflected signal and the summation within the entrance pupil of the read head. The technical result is to increase the performance of procedures for the modeling of signals for different types of digital optical discs with shortcuts is similem (see the graphical part)e

Claims

1. The method of modeling a signal read from an optical disc, comprising steps in which (a) record in the database ranges of values of the initial parameters of the optical disks of different types and information elements of the recording layer, b) is chosen from the database of the source parameters of the optical disk, and information elements of the recording layer selected from the group consisting of grooves, pits and marks on the outer surface of the recording layer and the labels on the bottom of the groove, a) determine the signal laser radiation reflected from the disk with the information elements of the recording layer and difragirovavshej on the spatial structure of the information elements of the recording layer, when this century. 1) is determined for the selected parameters of the optical disk, and information elements of the recording layer composition of the components of the reflected difragirovavshej field, and mentioned information items selected from a group comprising the outer surface of the recording layer, the bottom and the slopes of the grooves, the bottom and the slopes of Pete, mark on the outer surface of the recording layer and the label on the bottom of the grooves and combinations of the above into layer calculates the complex amplitude of the corresponding component of the reflected field, century 3) is calculated for all the information elements of the recording layer, the total complex amplitude of each component of the reflected field and restore the full reflected field by adding the total complex amplitudes of the components of the reflected field with the appropriate weights, g) determine the signal read from the optical disk, by calculating the full intensity of the reflected signal and the summation within the entrance pupil of the read head.

2. The method according to p. 1, characterized in that in stage (C. 2) determine the distribution of the complex amplitude, expressed through the amplitude and phase of the laser signal reflected from the outer surface of the recording layer of the disk on the reference sphere with coordinates (x2,2) formulawhere Rop- the distance from the recording layer of the optical disk in the nominal position to the entrance pupil of the read head; Zd- defocusing optical disk from the nominal position; NpHHPU- the radii of the banners of the illuminating laser beam in the sagittal and meridional planes x1z1and y1z1respectively; ZCH, >respectively; NxNythe radii of the illuminating laser beam in planes on the reference sphere x2z2and y2z2accordingly, Adthe amplitude of the illuminating laser beam in the center of the banners on the disk;
dis the amplitude reflection coefficient of the outer surface of the recording layer of the disk,
K = 2is the wave number,is the laser wavelength in vacuum.

3. The method according to p. 1. characterized in that in stage (C. 2) determine the distribution of the complex amplitude, expressed through the amplitude and phase of the laser signal reflected from the bottom of the groove, by formulas


where Hx1Hy1- covering radii of the laser beam on the disk in the planes x1z1and y1z1respectively;
x= -Zd/(Z2d+Z2CH- the curvature of the wavefront of the illuminating laser beam on the disk in the plane x1z1;
y= -Zd/(Z2d+Z2ku- the curvature of the wavefront of the illuminating laser beam on the display is;
n=/n is the laser wavelength in the material of the substrate disk;
A2X= (1/Hx1)2;
In2X= 0.5 KnZd/(Zd2+ZCH2);
A2 = A2x(n/(Zop))2/(A22x+B22x);
B2 = B2(n/(Zop))2/(A22x+B22x);
Zop= Rop+Zdis the radius of the reference sphere, the top of which is located on the disk at a point on the axis of symmetry z1, z2the optical system of the read head;
VU2= y2n/(Zop);
Kahnis the amplitude reflection coefficient of the groove;
Acp_Kahn= (1/3)(exp[-(XKahn/Nx1)2(YKahn/NN1)2] +exp[-(XKahn/Nx1)2-((YKahn-0,5Kahn)/NN1)2] +exp[-(XKahn/Nx1)2-((YKahn+0.5 VKahn)HN1)2] );
XKahn, YKahn- coord. is XKahn= -sin()Ysrcen-XGL1;
YKahn= +cos()Ysrcen-XGL1.
Xsrcen, Ysrcen- the coordinates of the center groove on the disk in the coordinate system of the illuminating optical system x1y1;
XGL1, YGL1the coordinates of the center of the main beam of the laser spot on the disk in the coordinate system of trails;
- turn angle of the track relative to the horizontal axis x1;
and determine the distribution of the complex amplitude, expressed through the amplitude and phase of the signal reflected from the first and second slopes of the grooves, by formulas


where X1srcen, Y1srcenthe coordinates of the center of the first slope of the grooves in the coordinate system of the illuminating optical system, defined as
X1srcen= -sin()Ysrcen-XGL1;
Y1srcen= +cos()Ysrcen-YGL1;
X1srcen, Y1srcenthe coordinates of the center of the first slope of the grooves in the coordinate system douki;

where Asrstkathe average amplitude of the laser on this slope of the groove, while the coordinates of the second slope of the grooves in the coordinate system of tracks are defined as

4. The method according to p. 1, characterized in that in stage (C. 2) determine the distribution of the complex amplitude, expressed through the amplitude and phase of the laser signal reflected from the bottom of the pit, by formulas


where acf= 0,2[exp(-(x1/HX1)2(y1/HY1)2)+exp(-((x1-0,5 XPete)/Hx1)2-(u1/HYl)2)+exp(-((x1+0.5 XPete)/Hx1)2-(u1/HY1)2)+exp(-(x1/Hx1)2- ((1-0,5 YPete)/HY1)2)+exp(-(x1/Hx1)2- ((1+0,5 YPete)/HY1)2))] ;
x1,1- the coordinates of the center pit on the disk;
XPete, YPete- dimensions Pete along the axes x1and y1;
x= 0,5 nKXPete(x2/Zp);
y= 0,5 nK

where Ysklet- the width of the slope Pete;

5. The method according to p. 1, characterized in that in stage (C. 2) determine the distribution of the complex amplitude, expressed through the amplitude and phase of the laser signal reflected from the tag on the outer surface of the recording layer of the disk, according to the formula


where
x1,1- the coordinates of the center marks on the outer surface of the recording layer,
MDis the amplitude reflection coefficient of the label on the outer surface of the recording layer of the disk,
SMDsquare label on the outer surface of the recording layer of the disk,
XMD, YMD- the sizes of the labels along the axes x1and y1.

6. The method according to p. 1, characterized in that in stage (C. 2) determine the distribution of the complex amplitude, expressed through the amplitude and phase of the signal reflected from the tag on the bottom of the groove by formulas


where
x1, y1- the coordinates of the center IU the skill sets;
SMcAnsquare label on the bottom of the groove;
XMcAn, YMcAn- dimensions of the label on the bottom of the groove along the axes x1and I1.

7. The method according to p. 1, characterized in that as a weight when full recovery of the reflected field use aberration function of the pupil Pd, RKahn, RPete, RMcAnPMD, RSCaccordingly, the outer surface of the recording layer of the disk, grooves, Pete, the label on the bottom of the grooves, the label on the outer surface of the recording layer of the disk and the slope of the groove or pit, which is determined by the formula
Pd= (d, 0,0);

whereKahn= 4n hKahn;
Pp= (dcos(p)-1,0,dsin(p)),
p= 4n hp;

PMD= ((MD-d), 0,0;
PSC= (-d, 0,0),
hKahnhp- according to which laud received components of the reflected field for the selected information items based on their aberration functions of the pupil by the formula
Esum(x2,2)= RdEd(x2,2)+PKahnEKahn(x2,2)+PSC{ Eskin(x2,2)+Eskin(x2,2)} +PPeteEPete(x2,2)+PSC{ Espit(x2,2)+Espit(x2,2)+Espit(x2,2)+Espit(x2,2)} +PMDEMD(x2,2)+PMcAnEMcAn(x2,2),
where










where NKahnNPeteNMDNMcAnaccordingly, the number of grooves, pits, marks on the land and labels on the bottom of the groove of the illuminating laser spot;
Ed(x2,2) - laser field after reflection from the outer surface of the disk;
EKahn(x2,2), Eskin(x2,2), Eskin(x2,<2), Espit(x2,2), Espit(x2,2), Espit(x2,2) - total field from the bottom and slopes of the pit:
EMD((x2,2) - total field labels on the outer surface of the recording layer;
EMcAn(x2,2) - total field labels at the bottom of the groove.

 

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