Interchangeable Ferrule for Dual-Wavelength Free-Space Optical Links
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Solution Overview
Problem
Existing communication systems face challenges in establishing full duplex optical communication links between balloons in a high-altitude network, as they require complementary terminals to transmit and receive data on different wavelengths, which can be difficult to align and switch between modes efficiently.
Innovation Solution
The use of a ferrule connector system with a dichroic beam splitter and a positionable steering mirror allows for interchangeable fiber optic connections, enabling the optical communication terminal to switch between modes by adjusting the steering mirror's orientation, thus facilitating full duplex communication by directing light of different wavelengths for transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complementary terminals are used to transmit and receive data on different wavelengths, then full duplex optical communication is achieved, but alignment and mode switching become difficult
Solution Approach 1:
The ferrule connector is designed to be universal and interchangeable between transmit and receive ports. The same ferrule type (e.g., LC or SC) is used for both wavelengths and both directions of communication, eliminating the need for different connectors for different functions. This multi-functionality approach resolves the contradiction by making the system easier to operate while maintaining full duplex capability.
Solution Approach 2:
The patent combines the transmit and receive optical paths into a shared physical infrastructure. Both wavelengths share the same ferrule connector type, same cable assembly structure, and same mechanical interface. This merging of functions into a unified system simplifies alignment procedures and mode switching, as the same physical components are used for both transmission and reception operations.
2Reliability
If separate fiber optic cables are used for transmit and receive paths, then full duplex communication is enabled, but system complexity increases
Solution Approach 1:
The patent merges the transmit and receive fiber optic cables into a single bundled cable assembly. Both fibers are housed together in the same cable jacket, with both ends terminated in matching ferrule connectors. This consolidation reduces the number of separate cable management tasks, simplifies routing, and decreases overall system complexity while maintaining separate optical paths for bi-directional communication.
Solution Approach 2:
The cable assembly is designed as a universal component that handles both transmit and receive functions. The same cable type and connector style are used for both optical paths, making installation, replacement, and maintenance simpler. This multi-functional cable design resolves the complexity issue by treating transmit and receive cables as identical components rather than specialized separate items.
3Ease of operation
If interchangeable ferrule connectors are used for both transmit and receive ports, then ease of operation improves, but precise alignment becomes more challenging
Solution Approach 1:
The ferrule connector design incorporates self-aligning features that allow the connector to automatically position the fiber cores in precise alignment when mated. The mechanical structure of the ferrule itself provides the alignment reference, eliminating the need for external alignment tools or complex adjustment procedures. This self-service alignment mechanism resolves the contradiction by maintaining high precision while preserving ease of operation.
Solution Approach 2:
The patent replaces manual alignment procedures with precision-machined mechanical features built into the ferrule connectors. Instead of requiring operators to manually adjust fiber positions, the design uses precisely manufactured mechanical elements (such as alignment pins, precision bores, and standardized connector geometries) to automatically ensure accurate fiber core alignment. This substitution of mechanical precision for manual operation resolves the contradiction between ease of use and alignment accuracy.
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
This solution enables efficient switching between communication modes, allowing for bi-directional data transmission over the same lightpath, enhancing the reliability and flexibility of high-altitude balloon networks by aligning optical paths dynamically.
Implementation Method 1
a dichroic beam splitter in the optical path from the primary aperture of the terminal. The dichroic beam splitter can allow one of the wavelengths to pass through and reflect the other
Implementation Method 2
each terminal generally incorporates one or more adjustable beam steering mirrors that direct laser light to and from the respective transmit/receive apertures
Implementation Method 3
a ferrule used to connect two fiber optic cables to an optical communication terminal
Data Source
AI summary
An optical communication terminal is configured to operate in two different complementary modes of full duplex communication. In one mode, the terminal transmits light having a first wavelength and receives light having a second wavelength along a common free space optical path. In the other mode, the terminal transmits light having the second wavelength and receives light having the first wavelength. The terminal includes a steering mirror that directs light to and from a dichroic element that creates different optical paths depending on wavelength, and also includes spatially separated emitters and detectors for the two wavelengths. A first complementary emitter/detector pair is used in one mode, and a second pair is used for the other mode. The system also includes at least two ferrules. Each ferrule operates with a single emitter/detector pair. The ferrules are designed to operate interchangeably with either emitter/detector pair.