Single-Carrier Optical Communication for Secure Data and Key Distribution
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Solution Overview
Problem
Existing optical communication systems require separate channels and light sources for simultaneous transmission of information and cryptographic keys, necessitating dedicated infrastructure and specialized equipment, which is costly and impractical for secure communication needs.
Innovation Solution
Utilizing modified amplitude modulation (OOK, PAM) or pulse arrival time (PPM) formats to encode both information and cryptographic key bits within a single optical carrier wavelength, employing a single communication channel with symbols differing in light intensity or time delay to ensure secure transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate channels and light sources are used for information transmission and cryptographic key distribution, then transmission security is improved, but device complexity and infrastructure cost increase
Solution Approach 1:
The patent combines information transmission and cryptographic key distribution into a single optical communication channel using the same light source and detector. By multiplexing the two functions in the time domain (using different time slots for information bits and key bits), the system achieves secure key distribution without requiring separate dedicated infrastructure, thus reducing device complexity while maintaining security
Solution Approach 2:
The optical communication channel is designed to perform multiple functions simultaneously - transmitting both classical information bits and quantum cryptographic key bits through the same channel using intensity modulation and direct detection. This universal approach eliminates the need for separate specialized channels, reducing infrastructure requirements while enabling secure communication
2Reliability
If separate channels are used for information and key transmission, then transmission security is improved, but cost of dedicated infrastructure increases
Solution Approach 1:
The system merges information transmission and key distribution into a single channel, eliminating the need for expensive dedicated infrastructure for key distribution. By using the same optical channel and detectors for both functions with proper time-division multiplexing, the patent reduces infrastructure costs while maintaining security through quantum mechanical principles
Solution Approach 2:
The system uses standard telecommunications infrastructure and detectors for both information transmission and key distribution, making the infrastructure self-sufficient. The same detectors used for information reception can detect key bits, and the system leverages existing optical communication components without requiring specialized expensive equipment
3Reliability
If specialized equipment is used for cryptographic key distribution, then transmission security is improved, but ease of operation decreases
Solution Approach 1:
The patent implements a universal optical communication system where the same channel and detectors handle both information transmission and key distribution. This eliminates the need for separate specialized key distribution equipment, simplifying operations while maintaining security through quantum mechanical properties of light detection
4Device complexity
If single optical carrier wavelength is used for both information and key transmission, then device complexity is reduced, but measurement precision requirements increase
Solution Approach 1:
The system uses periodic time-division multiplexing to separate information bits and key bits in the time domain. By transmitting them in alternating time slots within the same optical carrier wavelength, the system achieves simple channel configuration while maintaining measurement precision through temporal separation that allows standard detectors to distinguish between the two signal types
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
Enables secure distribution of cryptographic keys even with eavesdropping, using standard telecommunications infrastructure and direct detection, ensuring security without dedicated satellite or specialized equipment.
Implementation Method 1
based on intensity modulation of an optical carrier wave and on direct detection thereof
Implementation Method 2
based on intensity modulation of an optical carrier wave and on direct detection thereof
Implementation Method 3
The intensity of light is in a strictly monotonic relationship to the number of photons and to the light power
Data Source
AI summary
A method and system for optical communication with simultaneous transmission of bits of information and distribution of cryptographic key bits using laser beam intensity modulation in a transmitter and using direct detection in a receiver. A laser beam of a specific optical carrier wavelength is modulated according to a common set of modulation symbols encoding simultaneously information bits and cryptographic key bits, symbols differing in at least one parameter selected from the group with light intensity and time delay, wherein the symbols used to encode different key bits differ in light intensity.