Photonics Packaging Self-Alignment Using Mode Converter Height Differences
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Solution Overview
Problem
Current silicon photonics technologies face challenges in achieving high yield and design flexibility due to alignment tolerance issues in photonics packaging, particularly for optical sources and wavelength division multiplexers, which are unsuitable for monolithic integration.
Innovation Solution
A photonics packaging method involving a substrate with a first and second optical device, where the second optical device is taller and includes a mode converter optically coupled to an integrated photonics chip, using an index-matching material and a planar member to align the mode converters, allowing for self-alignment without active control and improved alignment tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hybrid integration and inter-chip photonics packaging are used to address optical source and wavelength division multiplexers, then design flexibility and yield are improved, but alignment tolerance becomes a critical parameter that worsens manufacturing precision requirements
Solution Approach 1:
The patent introduces a vertical dimension to the alignment problem by using mode converters with different heights. The taller mode converter physically contacts the shorter one, establishing alignment in the vertical dimension, which then facilitates horizontal alignment through optical mode matching. This dimensional transformation resolves the alignment tolerance issue by adding a new degree of freedom to the packaging process.
Solution Approach 2:
The patent uses index-matching material as an intermediary substance between the two optical devices. This material facilitates optical coupling while allowing mechanical adjustment and alignment. The intermediary enables the system to achieve precise alignment without requiring extremely tight manufacturing tolerances, as the index-matching material compensates for minor misalignments.
2Ease of manufacture
If monolithic integration is used for silicon photonics, then manufacturing simplicity is improved, but functionality is limited due to unsuitable material properties for light generation and temperature stability
Solution Approach 1:
The patent divides the photonic system into separate functional modules that are independently fabricated and then packaged together. Different material systems optimized for specific functions (light generation, modulation, detection) are segmented into separate chips or components, allowing each to be manufactured with optimal material properties while maintaining overall system integration.
Solution Approach 2:
The patent employs hybrid integration that combines different material systems in a single packaged device. By using composite material approaches, the system leverages the advantages of multiple material platforms (e.g., III-V semiconductors for light generation, silicon for modulation and detection) to achieve functionality that cannot be realized with monolithic silicon alone.
3Loss of energy
If alignment tolerance is tightened to improve coupling precision, then optical loss is reduced, but manufacturing complexity and yield worsen
Solution Approach 1:
The patent implements self-alignment mechanisms where the taller mode converter automatically positions itself relative to the shorter one through physical contact. The optical mode matching provides self-correcting alignment, where the system naturally seeks the optimal coupling position. This self-service approach reduces optical loss without requiring external alignment equipment or complex manufacturing processes.
Solution Approach 2:
The patent changes the physical parameters of the mode converters, specifically their heights, to enable automatic alignment. By adjusting the height parameter, the system transforms a precision alignment problem into a simple mechanical contact problem, significantly improving yield while maintaining low optical loss through proper mode matching.
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 method achieves significant alignment tolerance, enabling passive optical alignment and low-loss coupling between integrated photonic chips, facilitating high-yield packaging and modularization of complex functionalities.
Implementation Method 1
An index-matching material is disposed in a space between the first and second optical devices
Implementation Method 2
The first optical device includes a first mode converter optically coupled to a first integrated photonics chip. A second optical device is also attached to the substrate. The second optical device includes a second mode converter optically coupled to a second integrated photonics chip.
Data Source
AI summary
A photonics packaging method is provided. The photonics packaging method includes providing a substrate (10) and attaching a first optical device (12) to the substrate (10). The first optical device (12) includes a first mode converter (14) optically coupled to a first integrated photonics chip (16). A second optical device (32) is also attached to the substrate (10). The second optical device (32) includes a second mode converter (34) optically coupled to a second integrated photonics chip (36). The second optical device (32) is of a greater height than the first optical device (12). An index-matching material (56) is disposed in a space between the first and second optical devices (12) and (32) and a force is applied on the second optical device (32) to cause the second optical mode converter (34) to align with the first optical mode converter (14). The index-matching material (56) is subsequently cured.