Multi-fiber ferrule receiver for QSFP transceiver integration
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Solution Overview
Problem
Conventional duplex LC connectors can only accommodate two optical fibers, limiting the number of channels that can be interfaced with a transceiver, while non-duplex multi-fiber ferrules like the MT-ferrule have a large footprint that restricts their integration with high-density transceiver interfaces such as QSFP/SFP.
Innovation Solution
A multi-fiber ferrule design that allows for a plurality of duplex connector housings to fit within a QSFP/SFP footprint transceiver interface, supporting more than two optical fibers (e.g., 16 optical fibers), along with a fiber optic ferrule receiver that accommodates this new ferrule design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional duplex LC connectors are used, then only two optical fibers can be accommodated, but the number of channels that can be interfaced with the transceiver is limited
Solution Approach 1:
The patent combines multiple duplex connector housings into a single integrated housing that can accommodate multiple ferrules (e.g., 8 ferrules in 4 duplex housings). This merging allows 8 optical fibers to be interfaced with a single QSFP/SFP transceiver, thereby increasing both the quantity of fibers and the number of channels without requiring separate connectors for each pair.
Solution Approach 2:
The integrated housing serves multiple functions: it houses multiple ferrules, provides alignment structures for all ferrules, offers a unified interface for the transceiver, and enables multi-channel communication. This multi-functionality allows a single connector assembly to replace what would traditionally require multiple separate duplex connectors.
2Quantity of substance
If non-duplex multi-fiber ferrules like MT-ferrule are used, then more than two optical fibers can be accommodated, but the large footprint restricts integration with high-density transceiver interfaces
Solution Approach 1:
The patent segments the multi-fiber ferrule into multiple individual ferrules (e.g., 8 separate ferrules), each with a small footprint similar to LC connectors. Each ferrule accommodates one optical fiber, and they are arranged in a compact grid pattern within the integrated housing. This segmentation allows high fiber density while maintaining a compact overall footprint that fits QSFP/SFP transceiver interfaces.
Solution Approach 2:
Multiple small ferrules are nested within a single integrated housing structure. The ferrules are arranged in a compact configuration (e.g., 2x4 grid) and held in place by alignment structures and retainers within the housing. This nesting approach allows 8 ferrules to occupy a footprint comparable to or smaller than a single MT-ferrule, enabling high-density integration.
3Quantity of substance
If multiple duplex connector housings are integrated into one housing, then more optical fibers can be interfaced with the transceiver, but the device complexity increases
Solution Approach 1:
The integrated housing is segmented into multiple bays or slots, each designed to accommodate a ferrule. Each bay includes standardized alignment structures (e.g., positioning protrusions, alignment grooves) and retention features. This modular segmentation simplifies the design by repeating standardized elements rather than creating a completely custom complex structure.
Solution Approach 2:
Multiple functional elements are merged into the integrated housing: ferrule retention mechanisms, alignment structures, sealing elements, and electrical contacts are combined into a single housing structure. This consolidation, while increasing complexity, is managed through standardized design patterns that allow the housing to be manufactured as a single piece or pre-assembled unit, reducing assembly complexity.
Data Source
AI summary
A fiber optic ferrule receiver includes a main body that has an opening extending between the front end and the rear end and being defined at least by a portion of internal surfaces of the four sides. A first side in the opening has first tapered surface and a second tapered surface, the first tapered surface reducing the opening between the rear end and a first position and the second tapered surface increasing the opening between the first position and the front end. There is also a second side in the opening and across the opening from the first side, the second side has a third tapered surface and a fourth tapered surface, the third tapered surface reducing the opening between the rear end and a second position and the second tapered surface increasing the opening between the second position and the front end. There is also a first projection extending into the opening from the first side to engage a first portion of the fiber optic ferrule at the first position, and a second projection extending into the opening from second side to engage a second portion of the fiber optic ferrule at the second position.