OPTICAL SIGNAL PROCESSINGOPTICAL SIGNAL PROCESSING

1.General structure of the optical processor1.General structure of the optical processor

2.Optical analog Fourier processor2.Optical analog Fourier processor

3.Optical analog correlation/convolution 3.Optical analog correlation/convolution processorprocessor

4. Optical digital processor4. Optical digital processor

Optical signal processing

systems

Analog Digital

Optical processorOptical processor

1 2 35

4

1- Laser; 2- SLM; 3- optical processing module; 4- memory and control module; 5- detector

Optical analog Fourier processorOptical analog Fourier processor

Y

X

L SLM D

FL

U

V

2D FOURIER TRANSFORMATION2D FOURIER TRANSFORMATION

FTFTFFx,yx,yFFu,vu,v==∫∫∫∫FFx,yx,yexpexpjj2π2πxu+yvxu+yvdxdxdydy

OPTICAL JOINTOPTICAL JOINT FOURIER FOURIER TRANSFORMATION PROCESSORTRANSFORMATION PROCESSOR

CRT SLM

OPTICS

LASERJT

PLANE

CORRELOUTPUT

FTL

Data Bus

Control Bus

OS OM

Optical analog Optical analog convolution/correlation processorconvolution/correlation processor

Y

X

L

SLM1SLM2

FL1

U

V

D

FL2

P

Q

Optical analog Optical analog convolution/correlation processorconvolution/correlation processor

SLM1 FL1 SLM2 FL2 D

CONVOLUTION/CORRELATION CONVOLUTION/CORRELATION SIGNALS PROCESSINGSIGNALS PROCESSING

CCξ,ηξ,η == ∫∫ ∫∫ FFx,yx,yH(xH(xξ,yξ,yη)dxdyη)dxdy --

F(x,y)F(x,y) – input signal – input signalH(x,y)H(x,y) - filter - filter

CONVOLUTION/CORRELATIONCONVOLUTION/CORRELATION

The convolution function calculation The convolution function calculation based on 2D Fourier transformation:based on 2D Fourier transformation:

CCξ,ηξ,η== FT FT--

11FTFTFFx,yx,y}}FTFT{H(x,y)}}{H(x,y)}}= = = = FTFT-1-1FFu,vu,vH*H*u,vu,v

OPTICAL PROCESSOR USING LASER DIODE OPTICAL PROCESSOR USING LASER DIODE ARRAYARRAY

S CRT L

M

OPTICSFILTERBANK

OUTPUTPLANE

LD ARRAY

FTL FTL

MATRIX OF SEMI-CONDUCTIVE LASERSMATRIX OF SEMI-CONDUCTIVE LASERS

COMPACT OPTICAL PROCESSORCOMPACT OPTICAL PROCESSOR2

0

150100

20

1

2

3 4 5 6

7

8 9 10

OPTICAL CORRELATION PROCESSOROPTICAL CORRELATION PROCESSOR

Time of optical correlation Time of optical correlation function calculation: function calculation: 1010-8-8 sec sec

The processor productivity:The processor productivity:

10101414 Bits/sec Bits/sec

The volume of optical processor The volume of optical processor 13 cm13 cm33

OPTICAL DIGITAL PROCESSOROPTICAL DIGITAL PROCESSOR

5 0 1 3 2

7 2 5 4 3

2 1 0 7 6

5 4 3 2 1

0 7 6 5 4

2 3

2 1 0

3 2 1

0

5 4

1 0

5 4 1

0 5 4

4

0

4

0 4

+ +

0 1