Signal Processing Device Multi-Stage Modulation Resolution
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Solution Overview
Problem
Current security measures in optical fiber communication, such as the Y-00 optical communication quantum cipher, face challenges in maintaining sufficient modulation resolution to prevent eavesdropping, particularly when the number of modulations is insufficient, allowing potential interception of signal content.
Innovation Solution
A signal processing device employing multiple stages of modulation, where a first modulation element modulates a signal in a primary range, and subsequent (k-1) modulation elements modulate the signal in narrower secondary ranges, controlled to achieve a higher overall modulation resolution, specifically decomposing the number of modulations into M1 × M2 × ... × Mk, with coarse and fine modulation stages to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of modulations is increased to improve security, then eavesdropping resistance improves, but modulation resolution deteriorates
Solution Approach 1:
The patent divides the single modulation process into multiple sequential modulation stages (first modulation element, second modulation element, etc.). Each modulation element applies a smaller number of modulation patterns (M1, M2, ..., Mk) respectively, so that the product M1×M2×...×Mk gives the total number of modulations. This segmentation allows achieving high total modulation count while maintaining reasonable resolution at each stage.
Solution Approach 2:
The patent transitions from a single-dimension modulation approach to a multi-dimensional approach by introducing multiple modulation elements operating in sequence. Each modulation element adds an additional dimension of modulation, transforming the problem from choosing between high modulation count or high resolution to achieving both through dimensional expansion.
2Measurement precision
If multiple modulation elements are introduced to improve modulation resolution, then security improves, but device complexity increases
Solution Approach 1:
The patent segments the modulation function across multiple independent modulation elements, where each element handles a specific portion of the total modulation task. This segmentation distributes the complexity across modular components rather than concentrating it in a single complex modulation unit.
Solution Approach 2:
Each modulation element is designed to perform a standardized modulation function with its own control range, allowing them to be potentially implemented using similar hardware structures. This multi-functionality approach reduces overall device complexity by using replicated simple units rather than a single complex unit.
Data Source
AI summary
The purpose of the present invention is to improve signal modulation resolution. A coarse phase modulation element 62A modulates a signal into any of M1 (M1 is an arbitrary integer) patterns in a first range. Fine phase modulation elements 62B-1 through 62B-(k−1) respectively modulate the signal into any of M2 through Mk (M2 through Mk are arbitrary integers that are independent of each other and M1) patterns in a second range through k-th range (k is an integer of 2 or greater). A coarse DAC 61A and DACs 61B-1 through 61B-(k−1) perform control such that the second range through k-th range become narrower than the first range.