Laser Patterned Waveguides for Passive Fiber to Chip Coupling
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Solution Overview
Problem
The manufacturing of silicon photonic devices faces challenges in fiber-to-chip coupling, which is time-consuming and costly due to the need for precise alignment of optical components at the individual die level, leading to low production throughput and yield losses.
Innovation Solution
Laser patterning is used to write optical features into photonic elements, allowing for the creation of waveguides and mechanical features with high precision, enabling optical and mechanical alignment without the need for separate and labor-intensive passive/active alignment processes, and can be applied at both die and wafer levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual die level alignment is used for fiber to chip coupling, then alignment precision is achieved, but production throughput is reduced
Solution Approach 1:
The patent combines multiple alignment operations (both passive and active alignment) into a single wafer-level process. Instead of performing separate alignment steps for each die, the system performs alignment once at the wafer level, then processes multiple dies simultaneously, merging what were previously sequential operations into parallel execution.
Solution Approach 2:
The patent transitions from three-dimensional manual alignment operations at the die level to a two-dimensional wafer-level planar process. By working at the wafer level rather than individual die level, the system eliminates the need for repeated vertical alignment operations, reducing complexity and enabling batch processing that increases throughput while maintaining precision.
2Manufacturing precision
If separate passive and active alignment processes are used, then alignment precision is achieved, but assembly time increases
Solution Approach 1:
The patent merges the previously separate passive alignment and active alignment processes into a single integrated wafer-level alignment operation. The system performs both alignment functions simultaneously during one processing step, eliminating the sequential execution that caused time delays while preserving the precision benefits of both methods.
Solution Approach 2:
The patent performs alignment operations at the wafer level before die separation, preparing all necessary alignment features and positions in advance. This preliminary action ensures that when dies are later processed individually, the alignment work has already been completed, eliminating the need for repeated alignment operations and reducing total assembly time.
3Manufacturing precision
If precision assembly is performed at die level, then alignment accuracy is maintained, but production cost increases
Solution Approach 1:
The patent moves the alignment process from the die level to the wafer level, changing the scale at which precision operations are performed. This dimensional shift allows precision alignment to be achieved once for the entire wafer, and the results are replicated across multiple dies, reducing the per-die cost of precision assembly while maintaining alignment accuracy.
Solution Approach 2:
The patent creates a universal alignment process that serves multiple dies simultaneously through wafer-level processing. The alignment features and procedures developed for one die can be replicated and applied to all dies on the wafer, making the precision assembly process universally applicable and reducing overall production costs through economies of scale.
4Manufacturing precision
If multiple alignment steps are performed, then alignment precision is achieved, but process complexity increases
Solution Approach 1:
The patent combines multiple sequential alignment steps into a single wafer-level alignment operation. Instead of performing separate passive alignment and active alignment processes in sequence at the die level, the system integrates both functions into one unified process executed at the wafer level, reducing the number of discrete steps and simplifying the overall manufacturing process.
Solution Approach 2:
The patent performs all necessary alignment operations as preliminary actions at the wafer level before die separation. By completing alignment, positioning, and feature creation in advance during a single wafer-level process, the system eliminates the need for repeated alignment steps later, significantly reducing process complexity while maintaining precision.
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 method increases production throughput and yield by simplifying the assembly process, reducing the risk of misalignment, and allowing for co-fabrication of components with improved precision, achieving optical and mechanical features with enhanced alignment and reduced labor-intensive verification tests.
Implementation Method 1
one or more optical features are written into the photonic element by laser patterning
Data Source
AI summary
Using laser patterning for an optical assembly, optical features are written into photonic elements at the end of a manufacturing sequence in order to prevent errors and damages to the optical features. The optical assembly is manufactured by affixing a photonic element to a substrate which includes one or more optical features and mapping one or more optical features for the photonic element. The optical features are then written into the fixed photonic element using laser patterning and the optical assembly is completed by connecting components, such as optical fibers, to the photonic element.