Self-Aligned Integrated Lens on Pillar for Electro-Optical Coupling
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Solution Overview
Problem
The challenge lies in efficiently coupling electro-optical devices with small optical window sizes to optical fibers, as decreasing the device area increases parasitic capacitance, leading to higher coupling losses and misalignment issues, particularly for high-speed data communication applications.
Innovation Solution
The development of a couplable electro-optical device with an integrated lens is achieved by adhering unshaped lens material to the electro-optical component, shaping it through a reflow process, and curing it to form a secured lens, allowing for improved coupling characteristics without the need for active alignment techniques, even with small core optical fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the device area is decreased to reduce parasitic capacitance, then the speed performance is improved, but the coupling loss increases due to smaller optical window size
Solution Approach 1:
An integrated lens is introduced as an intermediary optical element between the electro-optical component and the optical fiber. This lens mediates the coupling process by focusing light from the small optical window onto the fiber core, thereby reducing coupling loss while maintaining the small device area required for high-speed operation
Solution Approach 2:
The solution moves from a two-dimensional planar configuration to a three-dimensional structure by adding the lens element that extends in the vertical dimension. This allows light to be focused through the third dimension (depth/focal length) to achieve better coupling efficiency without increasing the lateral device area
2Device complexity
If the optical window size is decreased to reduce device area, then the parasitic capacitance is reduced, but the alignment precision required increases
Solution Approach 1:
The integrated lens acts as a tolerance-compensating intermediary that reduces the sensitivity to alignment errors. By providing optical focusing capability, the lens creates a larger effective coupling area, thereby reducing the precision requirements for aligning the small optical window with the fiber core
Solution Approach 2:
The lens changes the optical parameters (such as numerical aperture and focal length) to create a more forgiving coupling system. This parameter transformation allows for larger alignment tolerances while maintaining coupling efficiency, thereby reducing manufacturing precision requirements
3Loss of energy
If active alignment techniques are used to improve coupling efficiency, then the coupling loss is reduced, but the device complexity and cost increase
Solution Approach 1:
The integrated lens enables passive self-alignment through optical focusing. The lens automatically concentrates light from the optical window onto the fiber core through its geometric optics properties, eliminating the need for complex active alignment mechanisms such as motors, sensors, or control systems
Solution Approach 2:
The solution extracts and eliminates the complex active alignment subsystem by replacing it with a simple passive optical element (the lens). This removal of unnecessary complexity reduces device complexity and cost while maintaining coupling efficiency
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 enhances the coupling efficiency of electro-optical devices with small optical windows to optical fibers, reducing misalignment issues and maintaining high-speed performance, enabling efficient operation without expensive active alignment methods.
Implementation Method 1
maintaining the unshaped lens material at a reflow temperature for a reflow time to allow the lens material to reflow into a formed lens shape
Implementation Method 2
curing the lens material to form an integrated lens secured to the electro-optical component on the substrate
Data Source
AI summary
Various embodiments provide methods for fabricating a couplable electro-optical device. An example method comprises fabricating a pillar on a substrate by forming a lens spacer portion about an electro-optical component fabricated on the substrate; and adhering unshaped lens material to an exposed surface of the pillar. The exposed surface of the pillar is disposed opposite the substrate. The example method further comprises maintaining the unshaped lens material at a reflow temperature for a reflow time to allow the lens material to reflow into a formed lens shape, and curing the lens material to form an integrated lens having the formed lens shape secured to the lens spacer portion and formed about the electro-optical component on the substrate.