Fiber Optic Connector Pre-Assembly for Narrow Pipe Installation
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Solution Overview
Problem
Existing methods for assembling fiber optic connectors require high precision tools and skilled operators, are costly, and result in connectors with poor long-term reliability due to the need for precise alignment and protection of optical fibers, especially when used in limited spaces like narrow pipes.
Innovation Solution
A method and apparatus where a ferrule assembly, spring, and spring seat are pre-assembled into an integral cable assembly with a reduced profile size, allowing easy passage through narrow pipes and quick assembly into a connector housing, with components except the housing being assembled as a whole to minimize errors and protect the ferrule and fiber ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional splicing or cold coupling methods are used to assemble fiber optic connectors in the field, then optical fiber connections can be established, but the assembly process requires high precision tools, skilled operators, and results in poor long-term reliability
Solution Approach 1:
The connector is divided into modular components: a pre-assembled ferrule assembly (containing the optical fiber and alignment features), a separate housing, and coupling mechanisms. The ferrule assembly is pre-configured with precise alignment features during manufacturing, eliminating the need for field alignment operations and reducing assembly complexity while maintaining reliability.
Solution Approach 2:
The ferrule assembly is pre-assembled in the factory with precise alignment of optical components, including pre-attachment of alignment sleeves, positioning features, and protective structures. This preliminary preparation ensures consistent alignment accuracy without requiring skilled operators or specialized tools during field installation.
2Reliability
If connectors are assembled with complete protection and alignment features, then reliability is improved, but the connector size increases making it difficult to pass through narrow pipes
Solution Approach 1:
The design employs nested protective structures where alignment sleeves are positioned within the ferrule assembly, and the ferrule assembly itself is housed within a compact connector housing. This nested arrangement provides multiple layers of protection and alignment assurance while minimizing the overall profile size to enable passage through narrow installation spaces.
3Manufacturing precision
If optical matching paste is used in V-shaped or U-shaped grooves for cold coupling, then fiber alignment is achieved, but the paste flows away, pollutes, and ages causing insertion loss to increase over time
Solution Approach 1:
The design eliminates the optical matching paste entirely by using precision-machined V-shaped or U-shaped grooves that provide mechanical alignment of the optical fibers. The grooves are designed with precise geometry to ensure proper fiber positioning without requiring any paste material, thereby avoiding the problems of paste flow, pollution, and aging while maintaining alignment precision.
Data Source
AI summary
The present invention discloses a fiber optic connector comprises: a ferrule assembly; a spring seat provided behind the ferrule assembly; and a spring provided between the ferrule assembly and the spring seat. The spring seat has a receiving chamber having an insertion port through which a portion of the ferrule assembly is inserted into the receiving chamber; wherein the ferrule assembly is pre-assembled into the receiving chamber of the spring seat in a way that the ferrule assembly is held to be movably engaged with the spring seat. The spring is fitted and compressed in the receiving chamber. As a result, the ferrule assembly, the spring seat and the spring are pre-assembled into an integral assembly before being inserting into a connector housing. All components of the connector except for the housing may be smoothly pulled through a small long pipe as a whole. After being pulled through the pipe, all components of the connector except for the housing may be easily and quickly inserted into the housing as a whole at one time.