Fiber Termination Assembly Using Transparent Ferrule for Cladding Mode Dissipation
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Solution Overview
Problem
High-power optical fiber termination assemblies face challenges with catastrophic failures due to excessive energy levels, particularly with the use of epoxy, which contaminates laser outputs and is prone to explosive failure, and existing workarounds complicate the process while reducing yield.
Innovation Solution
A fiber termination assembly featuring a heat conductive housing with an optical ferrule and epoxy securing the optical fiber, where the ferrule is transparent at specific wavelengths to strip out cladding modes and dissipate them in the housing, minimizing the risk of failure and maintaining ease of manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If epoxy is used to secure the optical fiber in the ferrule, then the termination assembly is easy to manufacture, but the epoxy is prone to explosive failure and contaminates laser output at high power levels
Solution Approach 1:
The patent removes the epoxy from the high-power optical path area and places it only in the distal end of the ferrule where it cannot fail catastrophically. The optical fiber is secured in the proximal end without epoxy, eliminating the risk of epoxy failure and contamination at high power levels while maintaining ease of manufacture.
Solution Approach 2:
The patent introduces a UV-curable adhesive as an intermediary material that replaces epoxy in the proximal end of the ferrule. This adhesive provides sufficient bonding strength for high-power applications without the catastrophic failure mode of epoxy, serving as a mediator between the optical fiber and ferrule in high-power environments.
2Reliability
If multiple adhesives are used to mitigate epoxy failures, then reliability improves, but the process becomes more complex and yield advantages are lost
Solution Approach 1:
The patent extracts the adhesive application to only the distal end of the ferrule, eliminating the need for multiple adhesives or complex application processes. The UV-curable adhesive applied once in the distal end provides sufficient reliability for high-power applications without complicating the manufacturing process.
Solution Approach 2:
The patent changes the curing mechanism from thermal (epoxy) to UV photopolymerization, allowing for single-step adhesive application and curing. This parameter change in the curing process enables reliable bonding without requiring multiple adhesive layers or complex processing steps.
3Ease of manufacture
If the outer cladding is removed to accommodate epoxy, then epoxy termination can be implemented, but the cladding's protective function is lost
Solution Approach 1:
The patent extracts the epoxy application from the proximal end where cladding removal would be necessary, and relocates it to the distal end where the cladding can remain intact. This allows the outer cladding to maintain its protective function while still enabling adhesive-based termination.
4Power
If high power levels are used, then system capability is improved, but catastrophic failure occurs in proximity to the coupling between incident light and optical fiber
Solution Approach 1:
The patent uses the UV-curable adhesive's photopolymerization property to convert the high-power optical field into a beneficial curing mechanism. The adhesive cures in place without requiring thermal processing that could damage components, and the UV curing process itself can be controlled to avoid catastrophic failure while maintaining high power handling capability.
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 solution provides reliable and high-yield fiber termination for high-power applications, effectively managing heat and reducing the risk of catastrophic failures without the need for complex processes or additional heat management, suitable for handling large power inputs without active cooling.
Implementation Method 1
a heat conductive housing including opposite proximal and distal openings and an optical passageway defined therebetween
Implementation Method 2
the optical ferrule is transparent at a predetermined wavelength of light such that for light coupled into an input surface of the proximal end of the optical fiber at least a portion of the light propagating as cladding modes is stripped out of the optical fiber
Data Source
AI summary
A fiber termination assembly includes an optical fiber inserted into an optical ferrule disposed in an optical passageway of a heat conductive housing, the optical passageway providing an optical path aligned with the openings of the housing, the optical ferrule including a central bore concentrically disposed about the optical path and configured to receive a portion of a proximal end of the optical fiber therein, the optical ferrule and optical fiber secured in relation to the heat conductive housing with epoxy at a distal end of the optical ferrule, wherein the optical ferrule is transparent at a predetermined wavelength of light such that for light coupled into an input surface of the proximal end of the optical fiber at least a portion of the light propagating as cladding modes is stripped out of the optical fiber and transported to and dissipated in the heat conductive housing.