Miniature MT Optical Assembly Flip-Chip Bonding Alignment
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Solution Overview
Problem
The existing optical interconnects for fiber optics are costly and time-consuming to manufacture due to the need for precise alignment, which complicates the assembly of arrays of optical fibers.
Innovation Solution
An optical interconnect assembly that includes a rigid mount, a substrate with optical apertures and bonding elements, and an optical die flip-chip bonded to the substrate, allowing for quick and reliable alignment without active alignment processes, using a combination of alignment pin holes and external bonding elements for secure attachment to an electrical circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise alignment is used in optical interconnects, then optical signal transmission is ensured, but manufacturing cost and time increase
Solution Approach 1:
The patent applies preliminary action by pre-aligning optical elements during the die bonding process before final assembly. The optical die is flip-chip bonded to the substrate with optical elements already positioned in their correct locations, eliminating the need for time-consuming active alignment during final assembly. This pre-positioning of optical elements resolves the contradiction by ensuring reliable optical signal transmission while maintaining high manufacturing speed.
Solution Approach 2:
The patent employs self-service through self-aligning features such as alignment pins and registration marks that automatically position optical elements correctly during assembly. The optical die and substrate include built-in alignment mechanisms that guide the optical elements into their proper positions without requiring external alignment equipment or manual adjustment, thus achieving both high reliability and high productivity.
2Reliability
If precise alignment is used in optical interconnects, then optical signal transmission is ensured, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the optical interconnect into modular components: an optical die containing multiple optical elements, a substrate with bonding elements, and a housing. Each module is independently manufactured and then assembled through standardized processes. This modular segmentation reduces assembly complexity while maintaining precise alignment through the standardized interfaces and alignment features between modules.
Solution Approach 2:
The patent uses alignment pins and registration marks as intermediary elements that facilitate precise positioning between the optical die, substrate, and housing. These intermediary alignment features act as mediators that simplify the assembly process by providing automatic positioning references, reducing the complexity of achieving precise alignment without requiring complex adjustment mechanisms.
3Manufacturing precision
If active alignment processes are used, then precise positioning is achieved, but manufacturing time increases
Solution Approach 1:
The patent eliminates active alignment processes by performing all necessary positioning actions preliminarily during the die bonding and module assembly stages. Optical elements are pre-positioned on the optical die with high precision using semiconductor fabrication techniques, and the entire optical die is then bonded to the substrate as a single unit. This preliminary positioning approach achieves high manufacturing precision without requiring time-consuming active alignment processes during final assembly.
Solution Approach 2:
The patent replaces mechanical active alignment systems with precision semiconductor fabrication processes and flip-chip bonding technology. Instead of using mechanical adjustment mechanisms or active alignment equipment during assembly, the positioning is achieved through precisely controlled bonding processes and integrated alignment features, significantly reducing manufacturing time while maintaining high positioning accuracy.
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
This solution enables the rapid and reliable manufacturing of optical interconnects, reducing manufacturing costs and time while maintaining precise alignment, and can tolerate some misalignment errors through the use of a lens array for improved efficiency.
Implementation Method 1
an optical die flip-chip bonded to the substrate
Data Source
AI summary
An optical assembly (10) includes a rigid mount (12) with a recess (26) proximate a first side thereof, a substrate (14), and an optical die (16) flip-chip bonded to the substrate (14). The substrate (14) is secured to the first side of the mount and includes a plurality of die bonding elements (40), a plurality of optical apertures (32), and a plurality of external bonding elements (42). A plurality of traces (44) interconnect the die bonding elements (40) and the external bonding elements (42). The optical die (16) includes a plurality of optical elements, each element including an optical signal interface (48), the die being bonded to the plurality of die bonding elements (40) such that the optical signal interface (48) of each element is in registry with an optical aperture (32) of the substrate (14) and the die (16) is at least partially enclosed by the recess (26).