Fiber Optic Ferrule Fixturing for Precise End Face Polishing
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Solution Overview
Problem
Current polishing fixtures struggle to precisely locate very small form factor ferrules within a port, leading to deviations in end face geometry and increased insertion losses due to improper clamping and positioning during the polishing process.
Innovation Solution
A method and apparatus that utilize a specific sequencing and magnitude of clamping forces on the ferrule's reference datums, including a primary, secondary, and optionally tertiary datum, to securely position the ferrule in a polishing fixture, ensuring precise alignment through a multi-step clamping process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional clamping methods are used on very small form factor ferrules, then the clamping force is applied, but the ferrule position deviates from the predetermined location
Solution Approach 1:
The patent applies preliminary action by first engaging the secondary reference datum with the fixture before applying full clamping force. This preliminary engagement establishes the correct ferrule position before the primary clamping action occurs, preventing position deviation during the polishing process
Solution Approach 2:
The clamping process is segmented into distinct stages: first engaging the secondary reference datum, then engaging the primary reference datum. This segmentation allows each reference datum to be properly established in sequence, ensuring both positioning precision and clamping stability
2Manufacturing precision
If insufficient clamping force is applied, then the ferrule position is maintained, but the ferrule becomes loose and misaligned during polishing
Solution Approach 1:
The preliminary engagement of the secondary reference datum creates a stable foundation that allows sufficient clamping force to be applied without causing misalignment. This preliminary action ensures the ferrule is properly positioned before the full clamping force is applied during polishing
Solution Approach 2:
The clamping force is applied dynamically in stages rather than as a single static force. The force magnitude and application point change during the process, first establishing position through secondary datum engagement, then securing the ferrule through primary datum engagement with appropriate force
Data Source
AI summary
A method of polishing a ferrule of a fiber optic connector is disclosed. The ferrule includes a plurality of optical fibers connected thereto and at least two reference datums, one being a primary reference datum and another being a secondary reference datum. The method includes inserting the ferrule in a port of a fixture, securing the ferrule within the port of the fixture, and polishing an end face of the ferrule while the ferrule is secured to the port of the fixture. The securing step includes imposing a first clamping force on the ferrule to engage the secondary reference datum of the ferrule with the fixture, and subsequently imposing a second clamping force on the ferrule to engage the primary reference datum of the ferrule with the fixture. A fixture for polishing a ferrule according to the method is also disclosed.