Optical Connector Thermal Actuator Alignment
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Solution Overview
Problem
Conventional optical connectors face challenges in achieving low-cost and high-reliability connections due to variations in optical fiber lengths, leading to potential damage and reduced long-term reliability, especially when using no-polish multi-fiber ferrules.
Innovation Solution
The implementation of a thermally driven actuator using a shape memory alloy spring and elastic body to displace the ferrule from a non-coupling to an optically connected position, ensuring precise alignment and reducing the risk of fiber damage during connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If no-polish connectors are used to reduce cost, then manufacturing cost is reduced, but fiber alignment precision deteriorates due to variation in fiber projection amounts
Solution Approach 1:
The patent applies preliminary action by pre-positioning the ferrule at a predetermined position before connection. The elastic body is pre-compressed between the ferrule and the housing, storing elastic energy that will be released upon connection to automatically adjust the ferrule position and ensure precise fiber alignment without requiring high-precision polishing of the ferrule end face.
Solution Approach 2:
The patent utilizes parameter changes by employing a shape memory alloy spring that changes its physical properties (elastic modulus, length) in response to temperature changes. When heated, the shape memory alloy spring transforms from a relaxed state to an expanded state, providing the necessary force to displace the ferrule to the predetermined position and ensure precise fiber alignment.
2Ease of operation
If fibers are allowed to project from the ferrule to enable connection, then connection is enabled, but fiber damage occurs due to impulsive forces when connectors are mated
Solution Approach 1:
The patent applies beforehand cushioning by positioning the ferrule at a predetermined position inside the housing that is offset from the end face of the housing. This predetermined position acts as a cushioning position that absorbs the impulsive force during connector mating, preventing direct transmission of shock to the optical fibers and thereby protecting fiber reliability while maintaining connection capability.
Solution Approach 2:
The patent introduces an intermediary mechanism - the elastic body - that mediates between the ferrule and the housing. The elastic body compresses and expands to gradually transmit and dampen the impulsive force during connection, acting as a buffer that protects the optical fibers from direct impact while enabling successful connector mating.
3Manufacturing precision
If the ferrule is positioned at the end face of the housing for optimal alignment, then alignment is optimized, but fiber damage risk increases due to direct impulsive force transmission
Solution Approach 1:
The patent applies preliminary action by pre-positioning the ferrule at a predetermined position that is offset from the housing end face before connection occurs. This predetermined position is calculated and designed to provide optimal alignment while maintaining a safety margin that prevents direct impulsive force transmission to the fibers during mating.
Solution Approach 2:
The patent introduces the elastic body as an intermediary element between the ferrule and the housing end face. This intermediary compresses upon connection, gradually transmitting the impulsive force and preventing direct impact on the fibers, thereby maintaining both alignment precision and fiber safety.
4Reliability
If conventional mechanical splice techniques are used with MT-ferrule connectors, then connection reliability is improved, but manufacturing cost increases due to high-precision polishing requirements
Solution Approach 1:
The patent replaces the conventional mechanical polishing system with a thermally actuated positioning system. Instead of using precision polishing to achieve fiber alignment, the patent uses a shape memory alloy spring activated by temperature change to automatically position the ferrule at the predetermined position, thereby achieving both low cost and high reliability.
Solution Approach 2:
The patent utilizes parameter changes in the shape memory alloy spring, which changes its physical properties (length, elastic modulus) in response to temperature changes. This allows the system to transition from a relaxed state during assembly to an expanded state during operation, providing the necessary force to position the ferrule precisely without requiring expensive polishing operations.
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 ensures reliable optical coupling by controlling the alignment of optical fibers, preventing damage from impulsive forces and maintaining long-term reliability while reducing costs associated with high-precision polishing.
Implementation Method 1
a thermally driven actuator using a shape memory alloy spring and elastic body to displace the ferrule from a non-coupling to an optically connected position
Implementation Method 2
a thermally driven actuator using a shape memory alloy spring and elastic body to displace the ferrule
Data Source
AI summary
An optical connector includes a fiber holder to hold optical fibers; a housing to accommodate the optical fibers and the fiber holder; and a thermally driven actuator to displace at least a part of the fiber holder upon application of heat from a first position at which the fiber holder is retracted inside the housing to a second position that allows the optical fibers to be optically coupled to a counterpart connector.