Optical Fiber Polishing Apparatus Planetary Gear System
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Solution Overview
Problem
Conventional field-terminated remote grip optical fiber connectors experience significant optical losses and reflections due to temperature-induced gaps caused by differences in the coefficient of expansion between the fiber and ferrule assembly, and existing polishing methods are prone to variability and craftsmanship errors, making them unsuitable for outdoor applications.
Innovation Solution
A polishing apparatus with a planetary gear system and a rotatable platen supporting polishing media, which securely holds and polishes the optical fiber connector, reducing craft sensitivity and variability by providing consistent, repeatable results through a mechanical, hand-held device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional field polishing methods are used, then the fiber tip can be polished to create protrusion, but the polishing results vary due to craftsmanship errors and are not repeatable
Solution Approach 1:
The polishing apparatus allows the fiber tip to polish itself through controlled protrusion and contact with the polishing pad, eliminating the need for manual manipulation skills. The system self-regulates the polishing process through mechanical constraints and predetermined travel distances.
Solution Approach 2:
The polishing process is segmented into distinct phases: protrusion setting, controlled contact, and predetermined travel distance polishing. The apparatus divides the fiber tip treatment into measurable, repeatable steps rather than relying on continuous manual polishing.
2Reliability
If a coplanar/flush polish is used for remote grip connectors, then the fiber tip contacts the ferrule tip, but temperature changes cause gaps due to different expansion coefficients leading to significant reflection
Solution Approach 1:
The apparatus pre-sets the fiber tip protrusion distance before polishing, ensuring that the fiber tip extends beyond the ferrule tip by a predetermined amount. This preliminary positioning compensates for thermal expansion differences, maintaining contact across temperature ranges.
Solution Approach 2:
The system changes the geometric parameter of the fiber tip arrangement by creating a controlled protrusion rather than a flush finish. This parameter change (from coplanar to protruding) provides thermal compensation, allowing the fiber tip to maintain contact with the counterface despite differential thermal expansion.
3Manufacturing precision
If excessive force or too many polishing strokes are used, then the fiber tip may be over-polished, but this causes unacceptable optical loss
Solution Approach 1:
The apparatus uses partial action by limiting the polishing to a predetermined travel distance rather than continuous polishing. This prevents over-polishing while achieving sufficient surface quality through controlled, limited contact.
Solution Approach 2:
The system incorporates feedback through the planetary gear mechanism that counts and limits the polishing strokes to a predetermined number. This mechanical feedback ensures consistent polishing depth and prevents excessive material removal that would cause optical loss.
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
The apparatus achieves consistent and repeatable polishing results, reducing optical losses and reflections across a wide temperature range, making it suitable for both indoor and outdoor applications by minimizing the impact of temperature-induced gaps and craftsmanship errors.
Implementation Method 1
The platen is coupled to a planetary gear system. A rotatable knob is exposed at an opening of the base, the rotatable knob being engaged with the planetary gear system to move the planetary gear system.
Implementation Method 2
The polishing media is disposed proximate to a fiber tip extending from an end face of the ferrule of the optical connector disposed in the mount when the cover is placed in the closed position. Moving the rotatable knob polishes the protruding fiber tip against the polishing media, for a predetermined travel distance.
Data Source
AI summary
A polishing apparatus is provided for polishing an optical fiber connector. The optical fiber connector includes a connector housing and a ferrule. The polishing apparatus includes a mount to receive and hold the optical connector and a polisher housing supported by a base. The polisher housing houses a polisher that comprises a platen that supports a polishing media, the platen being coupled to a planetary gear system. The mount is disposed on a cover that encloses the polisher housing when the cover is placed in a closed position. A rotatable knob is exposed at an opening of the base, the rotatable knob being engaged with the planetary gear system to move the planetary gear system. The polishing media is disposed proximate to a fiber tip extending from an end face of the ferrule of the optical connector disposed in the mount when the cover is placed in the closed position.