Optical Wireless Terminal Polarization Control Against Wiretapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical wireless communication systems face challenges in detecting wiretapping attempts through penetration, which compromises security and confidentiality.
Innovation Solution
An optical wireless communication terminal and system with adaptive polarization control, utilizing transmission and reception modules and a control module to adjust polarization states according to synchronized control plans, making it difficult for wiretappers to intercept data by regularly or irregularly changing polarization states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical wireless communication transmits light signals through free space with strong straightness and narrow angle, then security and confidentiality are enhanced, but wiretapping through penetration becomes difficult to detect
Solution Approach 1:
The patent applies dynamics by continuously changing the polarization state of transmitted light signals according to a polarization control plan. The polarization angle is dynamically adjusted over time, transforming a static security mechanism into a dynamic one that adapts to prevent undetected wiretapping. This resolves the contradiction by making the communication system inherently changeable, so that any fixed wiretapping device cannot consistently intercept the signal.
Solution Approach 2:
The patent implements periodic action through the polarization control plan that cycles through different polarization angles at predetermined intervals. The system periodically switches between multiple polarization states (e.g., 0°, 45°, 90°, 135°), creating a repeating pattern that prevents continuous wiretapping. This periodic variation ensures that even if a wiretapper intercepts the signal at one polarization state, the signal changes before they can process it completely.
2Reliability
If polarization state is continuously adjusted to prevent wiretapping, then security is enhanced, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by varying only the polarization angle parameter while keeping other communication parameters (wavelength, modulation format, transmission power) constant. The polarization control plan systematically changes the polarization angle according to a predefined sequence, achieving security enhancement through a single parameter variation rather than multiple parameter changes, thus limiting the increase in system complexity.
Solution Approach 2:
The patent implements preliminary action by pre-defining the polarization control plan before actual communication begins. The polarization angle sequence is predetermined and synchronized between transmitter and receiver, eliminating the need for real-time complex calculations or feedback mechanisms during data transmission. This preliminary preparation simplifies the real-time system requirements while maintaining security.
3Reliability
If polarization control plan is synchronized between transmitter and receiver, then data transmission reliability is improved, but detection of polarization manipulation becomes more difficult
Solution Approach 1:
The patent applies feedback through the polarization tracking mechanism where the receiver continuously monitors the incoming light's polarization state and adjusts its local oscillator accordingly. This feedback loop ensures that the receiver remains synchronized with the transmitter's polarization changes, maintaining optimal signal reception while making it difficult for wiretappers to detect or intercept the signal, as any interception would disrupt the synchronized feedback mechanism.
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
Enhances security and reliability by ensuring only synchronized polarization states allow data transmission, adaptively changing plans to thwart wiretapping attempts and maintain data integrity.
Implementation Method 1
a transmission module configured to adjust a polarization state of transmission light
Implementation Method 2
a reception module capable of receiving reception light having a variable polarization state from another optical wireless communication terminal
Data Source
AI summary
Provided are an optical wireless communication terminal and system and an automated polarization control (APC) method. The optical wireless communication terminal includes a transmission module configured to adjust a polarization state of transmission light; a reception module capable of receiving reception light having a variable polarization state from another optical wireless communication terminal; and a control module functionally connected to the transmission module and the reception module, wherein the control module respectively adjusts polarization states of the reception module and the transmission module according to a designated polarization control plan, such that the reception module receives the variable reception light and the transmission module transmits the adjusted transmission light.