Flat-Lens PIC Optical Subsystem for Precise Multimode Coupling
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Solution Overview
Problem
Conventional approaches for integrating optical components with photonic integrated circuits (PICs) in multimode transceivers are complex, time-consuming, and costly, with challenges in efficient light coupling and alignment accuracy.
Innovation Solution
The use of a photonic integrated circuit (PIC) with vertically integrated VCSELs and photodetectors, along with metalenses for optical beam transformation, collimation, and focusing, enables efficient optical coupling and alignment on a compact substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional approaches are used for integrating optical components with PICs, then manufacturing complexity and time increase, but alignment accuracy and light coupling efficiency deteriorate
Solution Approach 1:
The patent merges the optical components (VCSELs, photodetectors, metalenses) directly onto the PIC substrate, eliminating the need for separate mounting and alignment steps. This integration approach simultaneously improves alignment accuracy by fixing component positions during fabrication and reduces assembly complexity by consolidating multiple components into a single substrate-based system.
Solution Approach 2:
The patent transitions from conventional planar or three-dimensional mounting approaches to vertical integration, stacking optical components in the vertical dimension above the PIC substrate. This vertical arrangement enables precise alignment through z-height control and simplifies lateral positioning, thereby improving alignment accuracy while reducing the horizontal footprint and assembly complexity.
2Productivity
If conventional integration methods are used, then assembly time increases, but light coupling efficiency decreases
Solution Approach 1:
By integrating metalenses directly onto the PIC substrate alongside VCSELs and photodetectors, the patent eliminates multiple assembly steps and alignment operations. This merging of components into a unified substrate-based system accelerates production while ensuring optimal light coupling through precisely controlled component positions and orientations established during fabrication.
Solution Approach 2:
The patent performs alignment and positioning actions during the fabrication process itself, before final assembly. Components are pre-positioned and fixed onto the PIC substrate with precise alignment, eliminating the need for time-consuming post-assembly alignment adjustments and ensuring optimal light coupling from the start.
3Manufacturing precision
If conventional approaches are used, then manufacturing costs increase, but alignment precision deteriorates
Solution Approach 1:
The patent combines multiple optical components and their mounting structures into a single integrated PIC-based system. This consolidation reduces the number of separate manufacturing processes, quality checks, and assembly operations required, thereby lowering overall manufacturing costs while maintaining high alignment precision through substrate-based component positioning.
Solution Approach 2:
The PIC substrate itself provides the alignment and positioning functionality that would otherwise require separate mechanical mounting structures. The substrate's inherent flatness, dimensional stability, and fabrication precision enable accurate component placement without additional alignment mechanisms, reducing manufacturing complexity and cost while improving alignment 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 approach simplifies the assembly process, reduces manufacturing costs, and enhances alignment accuracy, allowing for early-stage testing of optical components and improved performance in high-speed optical communication systems.
Implementation Method 1
A laser or laser light emitted therefrom may be modulated by a modulation signal, such as an electronic digital signal, to produce an optical signal
Implementation Method 2
An optically sensitive device, such as a photodiode, is used to convert the optical signal to an electronic digital signal
Implementation Method 3
metalenses for optical beam transformation, collimation, and focusing
Data Source
AI summary
An optical subsystem with flat lenses for multimode transceivers is provided. The optical subsystem includes a photonic integrated circuit (PIC). The optical subsystem also includes a vertical cavity surface emitting laser (VCSEL) disposed on the PIC, a photodetector disposed on the PIC, a transmit multimode fiber (TX-MMF) disposed on the PIC, and a receiver multimode fiber (RX-MMF) disposed on the PIC. The PIC includes a substrate, an oxide layer disposed above the substrate, and a plurality of metalenses disposed in the oxide layer. The substrate includes a polymer region and a mirror disposed at a base of the polymer region.