Surface-Emitting Laser Bistability for True Random Number Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for generating random numbers using physical systems are complex and costly, requiring multiple components and posing challenges in reliably controlling randomness.
Innovation Solution
A method utilizing a surface emitting laser, such as a VCSEL, driven in direct modulation mode below and above the lasing threshold to emit laser pulses, with a bistability zone, allowing for the generation of random numbers using a single laser and reducing system complexity and cost through a photodetector and mode separator to separate and detect distinct laser modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical systems with multiple lasers are used to generate random numbers, then randomness reliability is improved, but system complexity increases
Solution Approach 1:
The patent merges the functions of multiple lasers into a single surface emitting laser by utilizing its inherent bistability zone, where the laser can arbitrarily emit pulses in one of two distinct modes. This consolidation maintains randomness reliability while significantly reducing system complexity by eliminating the need for multiple laser components and their associated control systems.
Solution Approach 2:
The surface emitting laser is designed to perform multiple functions: it generates laser pulses, exhibits bistable mode switching for randomness, and serves as the sole light source for the random number generator. This multi-functionality reduces the overall system complexity while maintaining the reliability needed for cryptographic applications.
2Reliability
If multiple components are used in random number generation systems, then randomness control is improved, but manufacturing cost increases
Solution Approach 1:
By combining the randomness generation function into a single surface emitting laser with bistable characteristics, the patent reduces the number of components that need to be manufactured and assembled. This significantly lowers manufacturing costs while maintaining reliable randomness control through the laser's inherent physical properties.
Solution Approach 2:
The surface emitting laser utilizes its own inherent bistability zone and physical characteristics to generate random pulses without requiring external randomization components. This self-service capability eliminates the need for additional expensive components while maintaining reliable randomness control.
3Productivity
If surface emitting laser is driven in bistability zone, then random number generation efficiency is improved, but system complexity increases
Solution Approach 1:
The patent changes the operating parameters of the surface emitting laser by driving it within its bistability zone, where the current is set to enable arbitrary mode switching. This parameter adjustment enables high-speed random pulse generation while the system complexity is managed through the use of a single laser component with inherent bistable characteristics.
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 the efficient generation of truly random numbers at reduced costs and complexity, with high repetition frequencies and resilience to noise, suitable for high-speed random bit generation.
Implementation Method 1
driving, using a power source and a controller controlling the power source, a surface emitting laser in direct modulation mode... so that laser pulses are emitted from the SEL
Implementation Method 2
detecting, by a photodetector, the laser pulses emitted by the surface emitting laser
Data Source
AI summary
Provided for herein is a method for generating random numbers, the method includes driving, using a power source and a controller controlling the power source, a surface emitting laser in direct modulation mode, wherein the direct modulation mode is controlled by the controller so that the surface emitting laser is alternately driven below and above the lasing threshold so that laser pulses are emitted from the surface emitting laser, wherein, for driving the surface emitting laser above the lasing threshold, a current is chosen so that the surface emitting laser operates within a bistability zone of the surface emitting laser, and wherein the method comprises detecting, by a photodetector, the laser pulses emitted by the surface emitting laser and generating random numbers from the detected laser pulses.