Optical Waveguide Information Retrieval via Acoustic Modulation
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Solution Overview
Problem
Existing methods for introducing information onto an optical waveguide are complex and lack efficiency in distinguishing information at multiple spaced locations.
Innovation Solution
A communication method involving the transmission of test signals with temporal offsets, where returned signals are processed to distinguish information introduced at different locations along the waveguide, utilizing distributed backscattering and an optical source with short coherence time, and configuring the waveguide to be sensitive to acoustic disturbances for enhanced signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If information is introduced at multiple spaced locations onto an optical waveguide, then the information transmission capability is improved, but it becomes difficult to distinguish and retrieve information from specific locations
Solution Approach 1:
The patent divides the continuous optical waveguide into discrete sensing segments by introducing acoustic modulation at specific spaced locations. Each location's information is encoded as a distinct acoustic signature that modulates the optical signal only at that segment, allowing the receiver to distinguish and retrieve information from individual locations even when multiple locations transmit simultaneously.
2Productivity
If conventional modulation techniques are used to introduce information onto the waveguide, then information can be transmitted, but the system becomes complicated
Solution Approach 1:
The patent replaces conventional optical modulation mechanisms (such as electro-optic modulators or acousto-optic modulators requiring external control systems) with a simpler acoustic modulation approach. Information is introduced by applying acoustic signals directly to the waveguide at specific locations, where the acoustic waves physically modulate the optical properties of the waveguide material, eliminating the need for complex electronic control circuitry.
3Reliability
If test signals are transmitted continuously without temporal offsets, then the waveguide can be monitored, but signals from different locations cannot be distinguished
Solution Approach 1:
The patent employs periodic test signal transmission with specific temporal offset patterns. Test signals are transmitted at regular intervals with time delays (temporal offsets) between signals destined for different locations. This periodic structure with temporal separation allows the receiver to correlate returned signals with specific transmission times and distinguish which location generated which information, while maintaining continuous monitoring capability.
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 efficient retrieval of information from multiple locations along an optical waveguide by differentiating between signals introduced at various points, allowing simultaneous information introduction and effective acoustic signal processing.
Implementation Method 1
The pulses will preferably be returned by a process of distributed backscattering, such as Rayleigh backscattering or other backscattering process resulting from inhomogeneities distributed in a substantially uniform manner along the waveguide.
Implementation Method 2
The waveguide will preferably be sensitive to acoustic pressure waves, such that the waveguide can act as an acoustic pick-up at the first and second location.
Data Source
AI summary
The present invention relates to the communication of information where the information is introduced at a plurality of spaced apart locations onto an optical waveguide. The following steps are performed: (i) transmitting test signals onto the waveguide, components of the test signals being returned in a distributed manner along the waveguide; (ii) receiving first component signals returned from beyond a first location at which information is introduced; (iii) receiving second component signals returned from beyond a second location at which information is introduced, the second component signals being returned through the first location; and, (iv) processing the second component signals using the first component signals to distinguish information introduced at the second location from information introduced at the first location.