RU2446431C1 - Optical fuzzificator - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: optical fuzzificator, having a minimum signal selector, also includes a radiation source, an optical n-output splitter, a first linear transparency filter, a second linear transparency filter, a field-effect transistor with a control p-n junction and a unit voltage source.

EFFECT: broader functional capabilities of the device, design of a fuzzification device, where the input variable is given in form of a fuzzy set, as well as simultaneous increase in computational efficiency.

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Description

The invention relates to computer technology and can be used in optical information processing devices built on the basis of continuous (fuzzy) logic.

Known optical computing device for subtracting optical signals, containing optical amplifiers, an input optical splitter, two groups of optical banners, optical branches, an annular branch, an optical comparator, an optical branch, a pair of coupled optical waveguides and an optical bistable element [Pat. RU 2103721 C1. A device for subtracting optical signals / S.V. Sokolov, A.A. Barannik, 1998].

The essential features of an analogue common with the claimed device are as follows: optical transparency, optical splitter.

A known optical computing device is a nonlinear power converter [US Pat. RU 2020550 C1. Optical functional converter / SVSokolov, 1994], containing a coherent radiation source, a differentiator, an optical n-output splitter, an optical transparency, an optical n-input combiner, a pair of optically coupled waveguides, an optical modulator.

The essential features of an analogue common with the claimed device are as follows: a radiation source, an optical n-output splitter, an optical transparency, an output of a radiation source is connected to an input of an optical n-output splitter, each output of an optical n-output splitter is connected to a corresponding input of an optical transparency.

The disadvantages of the above devices are the complexity and inability to perform the operation of introducing fuzziness - fuzzification, when setting the input variable in the form of a fuzzy set.

Known optical computing device - minimum signal selector (CMC) [A.c. USSR No. 1223259. The minimum signal selector / Sokolov S.V. et al., 1986], adopted as a prototype and intended to calculate the minimum signal from a set of optical signals supplied to its input. CMC contains differential optocouplers, input optical waveguides.

The prototype is an essential feature of the invention.

The disadvantage of the above device is the inability to perform the operation of introducing fuzziness - fuzzification, when setting the input variable in the form of a fuzzy set.

The objective of the invention is the creation of an optical fuzzifier, which allows to increase the computational productivity of the fuzzification process to 10 ⁵ -10 ⁶ operations per second while at the same time it is possible to perform the operation of introducing fuzziness - fuzzification, when setting the input variable in the form of a fuzzy set.

The technical result is expressed in expanding the capabilities of the device - creating a device that performs the operation of introducing fuzziness - fuzzification, when setting the input variable in the form of a fuzzy set, and also at the same time increasing computational performance.

The essence of the invention lies in the fact that a radiation source, an optical n-output splitter, a first linear optical transparency, a second linear optical transparency, a field effect transistor with a control pn junction, a unit voltage source, an output of a source are introduced into an optical fuzzifier containing a minimum signal selector radiation is connected to the input of the optical n-output splitter, the outputs of which are connected to the corresponding inputs of the first linear optical transparency, the outputs of which are connected to the corresponding inputs of the second linear optical transparency, each output of which is connected to the corresponding input of the minimum signal selector, the output of the minimum signal selector is connected to the gate of the field effect transistor connected according to a common source circuit, the drain of which is connected to the positive pole of the unit voltage source connected to the field effect transistor sequentially, and is the output of the device.

Optical fuzzifier - a device designed to calculate in real time the value of a function:

where α (x) is the membership function that describes the term of the fuzzy linguistic variable x;

x _i is a specific numerical ("clear") value of the input linguistic variable, defined on the base scale X (x ₁ , x ₂ , .., x _n , where n is a certain number of values on the base scale X, x _i ∈ X);

β (x) is the membership function of the fuzzy set, in the form of which the input variable x is represented.

Functional diagram of the optical fuzzifier shown in figure 1.

Optical fuzzifier contains:

- 1 - radiation source (NR) with an intensity of n conv (ov) units (units);

- 2 - optical n-output splitter;

;- 3 - the first linear optical transparency (LOT) with a transmission function 1 proportional to

;

;- 4 - second LOT with transmission function proportional to

;

- 5 - the minimum signal selector (CMC), made in the form of CMC described in [A.s. USSR No. 1223259. Minimum signal selector / Sokolov S.V. et al., 1986];

- VT 6 - field-effect transistor with a control p-n junction, included in the scheme with a common source;

- E7 - source of unit voltage.

The output of AI 1 is connected to the input of the optical n-output splitter 2. The outputs 2 ₁ , 2 ₂ , 2 ₃ , ... 2 _{n of the} optical n-output splitter 2 are connected to the corresponding inputs of the first linear optical transparency 3. The outputs of the first linear optical transparency 3 are connected to the corresponding inputs of the second linear optical transparency 4, each output of which is connected to the corresponding input of the minimum signal selector 5. The output of the minimum signal selector 5 is connected to the gate of the field-effect transistor VT6, connected according to the scheme with a common source, - the source of the field-effect transistor VT6 is connected to the common bus, the drain of the field-effect transistor VT6 is connected to the positive pole of the unit voltage source E7, minus the source of unit voltage E7 is connected to the common bus, the drain of the field-effect transistor VT6 is the output of the device.

, на выходах которого формируется плоский оптический поток с интенсивностью по оси ОХ, пропорциональной функции 1/α(х). Данный оптический поток поступает на входы второго линейного оптического транспаранта 4 с функцией пропускания по оси ОХ, пропорциональной функции

, на выходах которого формируется оптический поток с интенсивностью по оси ОХ, пропорциональной функции 1/(α(х)·β(х)).The operation of the device is as follows. From the output of AI 1 light flux with intensity n srvc. units arrives at the input of the n-output splitter 2. From the outputs 2 ₁ , 2 ₂ , ..., 2 _{n of the} optical n-output splitter 2, luminous fluxes of unit intensity go to the inputs of the first linear optical transparency 3 with the transmission function along the OX axis, proportional to the function

at the outputs of which a flat optical stream is formed with intensity along the OX axis proportional to the function 1 / α (x). This optical stream enters the inputs of the second linear optical transparency 4 with the transmission function along the OX axis, proportional to the function

at the outputs of which an optical flow is formed with intensity along the OX axis, proportional to the function 1 / (α (x) · β (x)).

This optical stream is supplied to the corresponding inputs of CMC 5. The operation of the minimum signal selector 5 is described in [A.S. USSR No. 1223259. Minimum signal selector / Sokolov S.V. et al., 1986]. A voltage signal proportional to:

(Moreover, it is obvious that the minimum value of the function 1 / α (x _i ) · β (x _i ) is defined for the same value of the argument x _i for which the maximum of the function α (x _i ) · β (x _i ), i = 1, ..., n).

The output signal of CMC 5 is fed to the gate of the VT6 field-effect transistor.

The drain current I _C in the field effect transistor VT6 is defined as:

where U _SI is the voltage between the source and drain of the field-effect transistor VT6;

R _C - channel resistance of the field-effect transistor VT6.

Because voltage U _SI - from a unit voltage source E7 is equal to unity, and the resistance of the channel of the field-effect transistor VT6 is proportional to the voltage U _ZI ("gate-source") coming from CMC 5 and proportional to the corresponding value 1 / α (x _i ) · β (x _i ), then taking into account equalities (2) and (3), the drain current I _{C of the} field effect transistor VT6 is proportional to the value:

,

,

those. the desired value of γ (γ ~ I _C ).

The speed of the optical fuzzifier is determined by the dynamic characteristics of the minimum signal selector and the field effect transistor. The minimum signal selector, made on avalanche photodiodes, has a response time of up to 80-100 ps, and a field-effect transistor with a controlling p-n junction has a frequency range of up to ten MHz. For existing continuous-processing information processing systems, such a speed ensures their operation in almost real time.

Claims (1)

An optical phase shifter containing a minimum signal selector, characterized in that a radiation source, an optical n-output splitter, a first linear optical transparency, a second linear optical transparency, a field effect transistor with a pn-junction control, a unit voltage source, an output of a radiation source are connected to the input of the optical n-output splitter, the outputs of which are connected to the corresponding inputs of the first linear optical transparency, the outputs of which are connected to the corresponding to the inputs of the second linear optical transparency, each output of which is connected to the corresponding input of the minimum signal selector, the output of the minimum signal selector is connected to the gate of the field effect transistor, connected according to a common source circuit, the drain of which is connected to the positive pole of the unit voltage source, connected in series with the field effect transistor , and is the output of the device.