Duplex MOST Connector V-Groove Alignment for Automotive Harsh Environments
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Solution Overview
Problem
Current optical connectors for high-bandwidth graded-index multimode fibers in automotive applications are expensive, prone to contamination, and unsuitable for harsh environments due to their high precision and sensitivity, which limits their use in dirty and varying temperature conditions, especially for data rates exceeding 1 Gbps.
Innovation Solution
A duplex optical fiber connector design featuring a lens component with V-grooves and a fiber component with flexible retention features to securely align and retain small core diameter fibers, using bonding techniques like laser welding or epoxy to assemble and secure the connector, ensuring precise alignment and durability in harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultra-high precision physical contact connectors (LC, SC, SN, MDC) are used for GI-MMF to achieve low insertion loss and high bandwidth, then manufacturing precision and connection reliability are improved, but cost increases significantly and susceptibility to contamination in harsh environments worsens
Solution Approach 1:
The connector is divided into separate components: a connector body housing, a insertable connector portion with fiber retention features, and a separate lens assembly. This segmentation allows the precision optical interface to be protected within the housing while the external portions can be designed for environmental robustness.
Solution Approach 2:
A protective housing acts as an intermediary between the precision optical components and the harsh external environment. The housing encapsulates the lens and fiber alignment mechanisms, shielding them from contamination while allowing the connector to function in automotive environments.
2Manufacturing precision
If ultra-high precision physical contact connectors are used to achieve low insertion loss, then manufacturing precision is improved, but cost increases prohibitively for automotive applications
Solution Approach 1:
The connector uses a simplified design with molded-in lens holders and basic fiber retention features rather than expensive precision mechanical adjustment mechanisms. This approach accepts slightly lower precision at each component level but achieves adequate overall performance at much lower cost, suitable for high-volume automotive production.
Solution Approach 2:
Multiple functions are merged into single components: the lens holder integrates optical alignment features directly into the molded structure, the fiber retention feature combines securing and alignment functions, and the housing provides both protection and structural support. This reduces the number of precision-machined parts and simplifies manufacturing.
3Manufacturing precision
If connectors are designed for controlled environments with reduced temperature range to maintain precision, then manufacturing precision is improved, but adaptability to harsh automotive environments worsens
Solution Approach 1:
The connector design parameters are optimized for automotive environmental conditions rather than controlled laboratory conditions. The lens housing and fiber retention features are designed to maintain adequate alignment across wide temperature ranges (-40°C to +85°C), and the protective housing provides thermal isolation for the precision optical components.
Solution Approach 2:
The protective housing and internal structure are designed beforehand to cushion and isolate the precision optical components from environmental shocks, vibrations, and temperature extremes. This pre-engineered protection allows the connector to maintain functionality in harsh automotive conditions without requiring active compensation mechanisms.
Data Source
AI summary
An optical fiber connector has a lens component and a fiber component. The lens component has at least one lens and an opening with at least one V-groove therein. The at least one lens is associated with the at least one V-groove. The fiber component is configured to be partially inserted into the lens component and has at least one bare fiber flexible retention feature configured to retain a fiber of a fiber optic cable within the at least one V-groove and also to align the fiber with the lens.