Optical digital comparison unit for equal-to, less-than, and greater-than determination

Area of Science:

• Computer Science
• Optical Engineering
• Information Technology

Background:

• Nonnumerical processing applications like database management and pattern recognition depend on digital comparisons.
• Advancements in optical memory and processing capabilities drive the exploration of optical techniques for these tasks.

Purpose of the Study:

• To propose a system design for an optical comparator.
• To perform multiple equal-to, less-than, and greater-than comparisons between binary words.

Main Methods:

• The proposed comparator utilizes three 2D arrays of optical elements based on a light-amplifying optical switch.
• It incorporates inverters, NOR gates, flip-flops, and a custom winner-takes-all network.
• The design leverages compact, high-speed optical devices.

Main Results:

• A theoretical processing rate of approximately 4 × 10^10 16-bit word comparisons per second is achievable.
• The comparator design supports multiple comparison types (equal-to, less-than, greater-than).
• A 2.5 × 10^4 pixel comparator is envisioned.

Conclusions:

• The developed optical comparator design offers a pathway to significantly accelerate nonnumerical processing tasks.
• The use of light-amplifying optical switches and a compact architecture is key to its high performance.
• This technology holds promise for enhancing the speed and efficiency of data-intensive applications.