Waveguide Alignment via Single-Mode Intermediary Offset
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Solution Overview
Problem
The alignment of multi-mode waveguides in arrayed waveguide grating devices to photodiodes is challenging due to varying output responsivity and beam steering, leading to incomplete reception of optical signals, which negatively impacts communication.
Innovation Solution
Aligning photodiodes to a single-mode waveguide with a fixed offset relative to multi-mode waveguides, allowing for improved alignment without complex measurement techniques, and translating the photodiode array based on this offset to achieve balanced responsivity across the photodiodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-mode waveguides are used to ensure flat-top response, then optical signal reception efficiency is improved, but alignment precision becomes more difficult to achieve due to varying output responsivity and beam steering
Solution Approach 1:
The patent introduces a single-mode waveguide as an intermediary alignment reference. The single-mode waveguide provides a stable, well-defined optical path that can be precisely aligned to the photodiode array, serving as a mediator to transfer alignment information from the photodiodes to the multi-mode waveguides. This intermediary approach resolves the alignment precision problem by providing a reliable reference framework.
Solution Approach 2:
The patent performs preliminary alignment by first aligning the single-mode waveguide to the photodiode array, establishing a precise alignment relationship before addressing the multi-mode waveguides. This preliminary action creates a known reference state that simplifies the subsequent alignment of the multi-mode waveguides, which would otherwise be complex due to their varying output characteristics.
2Measurement precision
If complex measurement techniques are used to align multi-mode waveguides, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The single-mode waveguide acts as a simple intermediary that enables precise alignment without requiring complex measurement systems. By using the single-mode waveguide's stable optical path as a reference, the alignment process becomes straightforward and can be achieved with simple optical tools, thereby reducing device complexity while maintaining precision.
Solution Approach 2:
The patent uses the single-mode waveguide as a simplified copy or representation of the alignment reference. Instead of directly measuring and aligning the complex multi-mode waveguides, the system creates a simplified reference model (single-mode waveguide) that captures the essential alignment information, making the alignment process simpler and less complex.
3Ease of operation
If photodiodes are aligned directly to multi-mode waveguides, then alignment is straightforward, but output responsivity becomes unbalanced
Solution Approach 1:
The single-mode waveguide serves as an intermediary that mediates between the photodiodes and multi-mode waveguides. By aligning to the single-mode waveguide first, the system achieves both ease of alignment and balanced output responsivity, as the single-mode waveguide provides a stable reference that ensures consistent optical coupling across all photodiodes while maintaining the flat-top response characteristic of multi-mode waveguides.
Solution Approach 2:
The patent performs preliminary alignment to the single-mode waveguide before final alignment to the multi-mode waveguides. This preliminary action establishes a balanced optical coupling relationship that ensures uniform responsivity across all photodiodes, while the subsequent alignment to multi-mode waveguides maintains this balance by using the pre-established reference framework.
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 enhances the alignment accuracy of multi-mode waveguides to photodiodes, improving optical communication by ensuring balanced responsivity and efficient signal reception.
Implementation Method 1
alignment of at least one of the plurality of photodiodes to at least one single-mode waveguide and translation of the optical waveguide chip relative to the plurality of photodiodes by a fixed offset of the at least one single-mode waveguide relative to the plurality of multi-mode waveguides
Implementation Method 2
a photodiode array to receive optical signals from the multiple output waveguides
Data Source
AI summary
According to some possible implementations, an optical device may include a plurality of photodiodes, wherein alignment of the plurality of photodiodes with a fixed separation to a plurality of multi-mode waveguides disposed on an optical waveguide chip and with the same fixed separation is optimized by alignment of at least one of the plurality of photodiodes to at least one single-mode waveguide and translation of the optical waveguide chip relative to the plurality of photodiodes by a fixed offset of the at least one single-mode waveguide relative to the plurality of multi-mode waveguides.