Optical Logic Gates Using Polarization-Based Logic Representation

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Solution Overview

Problem

Existing optical gates using intensity-based representations of logic levels are inefficient, costly, and complex, requiring regeneration of output electromagnetic waves and utilizing expensive components like uniaxial crystals and semiconductor-type photo-detectors, while polarization-based logic level representation in prior art is limited to specific polarization angles.

Innovation Solution

The implementation of polarization-based logic level representation using an apparatus and method that splits an input polarized beam into two beams with identical or nearly identical polarization angles, where the ratio of their amplitudes is one and the difference in their polarization angles is 180 degrees, allowing for optical elimination of beams representing different logic states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If intensity-based representation of logic levels is used in optical gates, then logical operations can be performed, but the system requires regeneration of output electromagnetic waves and uses costly components such as uniaxial crystals and semiconductor-type photo-detectors

Engineering Contradiction:

Improvecost effectivenessVSAvoidsystem complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent changes the representation parameter from intensity to polarization angle. By encoding logic levels as polarization angles (0° for logic 0, 90° for logic 1), the system eliminates the need for intensity-based regeneration and costly components like uniaxial crystals and semiconductor photo-detectors, achieving cost-effective operation while maintaining logical operation capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the mechanical/intensity-based detection system with a polarization-based optical system. Instead of using semiconductor-type photo-detectors to detect intensity levels, the system uses polarization optics to represent and detect logic levels, simplifying the device architecture and reducing component costs

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If intensity-based representation is used, then logical operations can be implemented, but regeneration of output electromagnetic waves is required prior to cascading gates

Engineering Contradiction:

Improvegate operation speedVSAvoidsignal processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

By changing from intensity-based to polarization-angle-based representation, the patent eliminates the regeneration step. Polarization states can be directly combined through optical elements without requiring signal regeneration, enabling faster gate operations and removing the complexity of regeneration circuits

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If polarization-based logic level representation is used with specific polarization angles, then logical operations can be performed, but the system is limited to fixed polarization angles only

Engineering Contradiction:

Improvepolarization angle flexibilityVSAvoidsystem configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extends the polarization angle representation from fixed values to any arbitrary polarization angle. By allowing logic levels to be represented by variable polarization angles rather than fixed values, the system achieves greater adaptability and versatility in optical logic operations while maintaining computational simplicity

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables cost-effective and computationally simplified logical operations in optical gates, improving efficiency and reducing the need for costly components by using polarization-based logic level representation for any polarization angle, thereby enhancing the speed and simplicity of optical gate operations.

Implementation Method 1

the first beam and the second beam have an identical or nearly identical relative polarization angle that equals or nearly equals the relative polarization angle of the input polarized beam

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

optically eliminating the first beam if the relative polarization angle of the first beam represents the second logic state; and optically eliminating the second beam if the relative polarization angle of the second beam represents the first logic state

Methodology Applied

Scientific EffectOptical elimination through polarization: Polarisation

Data Source

PatentUS8325404B2Optical logic devices having polarization-based logic level representation and method of designing the same

Publication Date: 2012.12.04 ZAGHLOUL YASSER A

AI summary

Logical operations are implemented using polarization-based logic level representation. An input polarized beam is split into a first beam and a second beam. The first beam is polarized at a first relative polarization angle and the second beam is polarized at a second relative polarization angle. The ratio of the amplitudes of two perpendicular polarization components of the input polarized beam is one or nearly one and the difference between the first relative polarization angle and the second relative polarization angle is 180 degrees or nearly 180 degrees. The relative polarization angle of the input polarized beam equals or nearly equals either the first relative polarization angle or the second relative polarization angle.