Alignment Waveguide for Optical Chip Collimator Precision
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Solution Overview
Problem
The alignment of waveguides on a chip with collimators in optical data transmission systems is challenging due to the need for precise optical coupling, which affects the quality and efficiency of signal transmission.
Innovation Solution
A system that includes a chip with waveguides and an alignment waveguide, coupled with a collimator having an array of micro-lenses and mirrors, uses a feedback loop to align the waveguides with the collimator by maximizing light transmission through a detected optical signal, allowing for semi-active alignment without powering the chip, and subsequent bonding for improved coupling accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional alignment methods are used to align waveguides with collimators, then alignment can be achieved, but the alignment precision is insufficient and coupling efficiency is reduced
Solution Approach 1:
The patent implements an active feedback alignment system where a detector monitors the optical signal transmitted through the alignment waveguide, and a control mechanism adjusts the relative position of the chip and collimator to maximize the detected signal. This closed-loop feedback approach achieves sub-0.1 micrometer alignment precision and optimizes coupling efficiency between waveguides and collimators.
Solution Approach 2:
The patent introduces an alignment waveguide as an intermediary component that facilitates precise alignment between the chip waveguides and collimator. This dedicated alignment waveguide acts as a mediator that carries alignment signals and enables accurate positional registration without affecting the primary data transmission waveguides.
2Measurement precision
If active alignment is performed by powering the chip, then alignment precision can be improved, but energy consumption increases and the system becomes more complex
Solution Approach 1:
The patent performs alignment operations before the chip is powered on for normal operation. The alignment waveguide is used to establish precise positional registration between the chip and collimator in advance, allowing subsequent data transmission to occur without requiring continued power consumption for alignment maintenance. This preliminary alignment action eliminates the need for continuous energy-consuming active alignment during data transmission.
3Device complexity
If alignment is performed without a dedicated alignment waveguide, then the device structure can be simpler, but alignment accuracy and repeatability are compromised
Solution Approach 1:
The patent segments the waveguide functionality into two distinct roles: data transmission waveguides and alignment waveguide. This segmentation allows the alignment waveguide to be optimized specifically for alignment purposes with dedicated coupling structures, while the data waveguides maintain their primary transmission function. The alignment waveguide is positioned at a known location with precise geometric relationships to other components, enabling repeatable and accurate alignment without complicating the overall device structure.
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 achieves precise alignment within 0.1 um accuracy, enhancing the efficiency of optical signal transmission and data transfer by optimizing the coupling between the chip and collimator, thereby improving the overall performance of optical data transmission systems.
Implementation Method 1
an alignment waveguide on the chip and configured to receive a second optical signal during an alignment stage that aligns the set of waveguides with a collimator including a set of lenses, and output the second optical signal from the chip
Implementation Method 2
The second optical signal output from the chip is indicative of a quality of alignment between the set of waveguides and the collimator
Data Source
AI summary
An optical device includes a chip, a set of waveguides on the chip and configured to carry first optical signals modulated with data during a data transmission stage, and an alignment waveguide on the chip. The alignment waveguide is configured to receive a second optical signal during an alignment stage that aligns the set of waveguides with a collimator including a set of lenses. The alignment waveguide is configured to output the second optical signal from the chip. The second optical signal output from the chip is indicative of a quality of alignment between the set of waveguides and the collimator.