Multiport Optical Probe Coupling to Photonic Integrated Circuits
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Solution Overview
Problem
Efficient coupling of light between an optical fiber and photonic devices integrated on a chip is challenging due to the difficulty in precisely aligning the fiber end within the limited Rayleigh range of the optical beam from a grating coupler, which requires time-consuming and precise alignments.
Innovation Solution
The method involves measuring and adjusting the distances between multiport optical probes and photonic integrated circuits (PICs) using reflected optical beams and detector signals, allowing for optimal optical coupling by determining suitable coupling distances based on interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If grating couplers are used for optical coupling, then coupling flexibility is improved, but alignment precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-determining the optimal coupling distance between the optical fiber and grating coupler through systematic measurement and characterization. This pre-established distance information is stored and used during actual coupling operations, eliminating the need for time-consuming real-time alignment adjustments while maintaining coupling flexibility
Solution Approach 2:
The patent implements feedback mechanisms by measuring the actual coupling performance and using this information to refine the optimal distance parameters. The system continuously monitors coupling efficiency and adjusts the predetermined distance values to account for variations in manufacturing tolerances and environmental conditions, thereby maintaining high alignment precision
2Reliability
If precise alignment procedures are implemented, then coupling efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary measurement and characterization of the optical coupling system to establish optimal distance parameters before actual deployment. By pre-determining these parameters through systematic scanning and performance evaluation, the system achieves high coupling efficiency without requiring time-consuming alignment procedures during operational use
Solution Approach 2:
The patent introduces dynamic adjustment capabilities that allow the system to adapt to varying conditions while maintaining optimal performance. The predetermined distance parameters can be dynamically adjusted based on feedback from performance monitoring, enabling the system to maintain high coupling efficiency across different operational scenarios without manual realignment
3Stability of the object's composition
If Rayleigh range is reduced for better coupling, then beam collimation is improved, but coupling distance flexibility decreases
Solution Approach 1:
The patent transitions from considering only axial distance to incorporating transverse position and angular orientation as additional dimensions for optimization. By characterizing the coupling performance across multiple spatial dimensions, the system identifies optimal parameter sets that maintain beam collimation while providing flexibility in coupling distance and positioning
Solution Approach 2:
The patent systematically varies multiple parameters including axial distance, transverse position, and angular orientation to map the complete coupling performance landscape. This multi-parameter characterization enables the system to identify optimal operating points that balance beam collimation requirements with coupling distance flexibility, allowing adaptation to different operational scenarios
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 enables precise and efficient optical coupling between multiport optical probes and PICs, reducing the time and effort required for alignment while ensuring optimal coupling performance.
Implementation Method 1
an optical beam emitted by one of the PIC or the multiport optical probe is reflected from the multiport optical probe or the PIC, respectively, at least once
Implementation Method 2
A detector signal responsive to the reflected beam is used to establish the distance
Implementation Method 3
the detector signal is an interference signal based on the reflected optical signal and an optical signal produced on the PIC by, for example, reflection
Data Source
AI summary
Distances between photonic integrated circuits and multiport optical probes can be established by emitting an optical beam from a first optical port of the multiport optical probe so that the optical beam is coupled into a first waveguide section of a PIC. This optical beam portion is reflected from a surface of the multiport optical probe back to the PIC. At suitable PIC-probe distances, the optical beam is coupled by a second waveguide grating to propagate in a second waveguide section and is then emitted to a second optical port of the multiport optical probe by a third waveguide grating coupler and directed to a detector. The detector signal is used to determine or adjust PIC-probe separation.