Bare Fiber Connector Alignment Channels Reduce Optical Loss
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Solution Overview
Problem
Current optical fiber connection technologies face challenges in achieving low loss performance and high interconnection density, especially as data centers transition from 10G and 40G to 100G and 400G transmission rates, with existing connectors experiencing high optical loss and requiring complex polarity management.
Innovation Solution
The optical fiber connection system employs bare fiber holders with alignment channels and a clamping mechanism, using optical adhesives for secure connections, which allows for low-loss, permanent terminations without the need for ferrules or index matching gels, enabling fusion-like performance with improved structural integrity and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ferruled connectors are used, then ease of reconfiguration is improved, but optical loss increases to 0.2-0.3 dB per connection
Solution Approach 1:
The patent removes the ferrule component from the connector design, extracting the source of misalignment and optical loss. By directly exposing and aligning bare fiber ends without ferrule housing, the system achieves fusion-like optical performance while maintaining mechanical connection capabilities.
Solution Approach 2:
The patent introduces a specialized alignment mechanism as an intermediary between fiber ends, using precision alignment features and clamping structures to achieve sub-micron alignment accuracy without requiring ferrules. This mediator enables direct fiber-to-fiber coupling with minimal loss.
2Quantity of substance
If multi-fiber ferruled connectors are used, then interconnection density is improved, but optical loss increases to 0.35-0.7 dB per connection
Solution Approach 1:
The patent segments the multi-fiber connection into individual fiber alignment zones within a unified connector structure. Each fiber pair has dedicated alignment channels and clamping regions, allowing independent optimization of alignment for each fiber while maintaining high-density packaging of multiple fiber pairs in a single connector.
Solution Approach 2:
The patent merges multiple fiber alignment and connection functions into a single integrated bare fiber connector structure. Multiple fiber pairs are connected simultaneously within one connector body, achieving high interconnection density while each fiber pair benefits from precision alignment comparable to fusion splicing.
3Loss of energy
If fusion splicing is used, then optical loss is reduced to near-zero, but device complexity and handling difficulty increase
Solution Approach 1:
The patent incorporates self-aligning features within the connector structure, including precision-machined alignment channels, tapered ferrule-less interfaces, and elastic clamping mechanisms that automatically guide and secure fiber ends in optimal alignment positions during insertion, eliminating the need for complex external alignment equipment.
Solution Approach 2:
The patent performs preliminary fiber preparation and alignment setup during the connector assembly process rather than at the time of connection. Fibers are pre-stripped, pre-positioned in alignment channels, and pre-clamped within the connector body, so that the final connection action requires only simple insertion without complex alignment procedures.
4Loss of energy
If traditional gel type mechanical splices are used, then optical loss is reduced approaching fusion splice levels, but structural integrity deteriorates due to non-solid index matching gels
Solution Approach 1:
The patent removes the index matching gel entirely from the connection interface, extracting the source of structural weakness. By achieving direct fiber-to-fiber contact through precision alignment and using alternative alignment and securing mechanisms, the system attains fusion-like optical performance with solid mechanical integrity throughout the connection structure.
Data Source
AI summary
An optical fiber connection system (600) configured to interconnect a plurality of first and second optical fibers (54, 54′) is described. The connection system comprises a first bare fiber holder (620) that includes a clamping plate (540) having an interconnection portion (544) with a generally planar surface, wherein bare ends of the plurality of first optical fibers (54) are disposed adjacent to interconnection portion (544) and wherein the plurality of first optical fibers (54) are secured in the first bare fiber holder (620) at a first distance from the bare ends of the plurality of first optical fibers (54) and a second bare fiber holder (620′) that includes a splicing plate (580) having a plurality of alignment channels (585), wherein a bare end of each of the second optical fibers (54′) extend at least partially into one of the plurality of alignment channels (585) and wherein the plurality of second optical fibers (54′) are held at a second distance from the bare ends of the plurality of second optical fibers (54′).