Multi-Frequency Laser Transceiver for Jamming Resistance
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Solution Overview
Problem
Free space laser communications face issues with wave front distortion due to atmospheric changes and security concerns, as existing systems often rely on single-frequency modulated lasers that are vulnerable to interference and jamming.
Innovation Solution
A multi-frequency laser communications transceiver system using multiple seed lasers with different wavelengths, amplifiers, and adaptive optics for signal encoding and decoding, along with frequency division multiplexing and advanced modulation techniques to enhance security and transmission robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-frequency modulated laser is used for free space communications, then the system is simpler to implement, but the system becomes vulnerable to jamming and interference
Solution Approach 1:
The patent divides the single laser source into multiple seed lasers operating at different frequencies (e.g., 1550nm, 1650nm, 1850nm bands). Each seed laser is independently modulated and then combined through optical multiplexing, creating a multi-frequency communication system that is more resistant to jamming while maintaining manageable complexity through modular architecture
Solution Approach 2:
The patent combines multiple laser sources at different frequencies into a single transmitted beam through optical multiplexing. The modulated signals from multiple seed lasers are merged in the optical domain, allowing simultaneous transmission of multiple frequency channels that can be independently decoded at the receiver, thereby enhancing security without proportionally increasing system complexity
2Reliability
If adaptive optics are used to correct wave front distortion, then transmission quality improves, but device complexity increases
Solution Approach 1:
The patent incorporates adaptive optics components (deformable mirrors, wave front sensors) that continuously measure and correct atmospheric distortion before the signal degrades. By performing preliminary correction of wave front errors, the system maintains transmission quality without requiring overly complex compensation mechanisms throughout the entire signal path
Solution Approach 2:
The patent implements a feedback loop where wave front sensors monitor incoming light distortion and provide real-time control signals to deformable mirrors or liquid crystal devices. This closed-loop adaptive optics system automatically compensates for atmospheric turbulence, maintaining high transmission quality while using standard commercial components to manage complexity
3Reliability
If multiple frequencies are used for communication, then security and transmission robustness improve, but system complexity increases
Solution Approach 1:
The patent employs a universal optical amplifier and transmission infrastructure that handles multiple frequency channels simultaneously. The same optical fiber, amplifiers, and basic modulation/detection circuits are used across all frequency bands, reducing overall system complexity despite the multi-frequency approach. The system achieves enhanced security through frequency diversity while maintaining operational simplicity through standardized components
Solution Approach 2:
The patent uses identical or near-identical seed laser modules operating at different standardized frequencies (e.g., C-band, L-band, S-band). Each frequency channel is a copy of the same basic laser architecture, allowing for simplified design, manufacturing, and maintenance. The modular copying approach enables easy addition or removal of frequency channels without redesigning the entire system
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
The system provides a robust, secure, and adaptable communication solution by transmitting and receiving signals across various frequencies, mitigating wave front distortions and interference risks, while improving transmission rates and security through complex encoding and adaptive optics.
Implementation Method 1
Multiplexed light is transmitted by a collimating lens along a target vector
Implementation Method 2
A telescope receives light from the target vector and provides focused light to a second detector
Data Source
AI summary
A laser communication apparatus is provided for sending and receiving messages. A processor encodes user messages for a modulator. The modulator provides control signals related to the encoded message to a plurality of seed lasers. Each seed laser can provide light at a different wavelength. Amplifiers are joined to amplify light from the seed lasers. Amplified light is multiplexed together. Multiplexed light is transmitted by a collimating lens along a target vector. A portion of the light can be monitored by a first detector. A telescope receives light from the target vector and provides focused light to a second detector. The second detector provides a signal responsive to the received light to the processor. The processor decodes this signal to provide the received message.