Laser Diode Edge Assembly for 3D Active Alignment
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Solution Overview
Problem
Achieving three-dimensional active alignment of optical components in optical transceiver assemblies, particularly challenging in single mode transmission, is difficult for mass production due to the precision required in aligning laser light sources with single mode fibers, which limits the efficiency of optical signal transmission.
Innovation Solution
A method and system for actively aligning a light source assembly in three dimensions along an optical bench using multiple alignment marks and slots, with adhesion materials and metal coatings for secure attachment via solder welding, allowing alignment in X, Y, and Z directions, enabling precise positioning of optical components for efficient optical signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active alignment is used to improve alignment accuracy of optical components, then coupling efficiency between laser light source and single mode fiber is improved, but manufacturing complexity and difficulty of mass production increases
Solution Approach 1:
The alignment process is segmented into two independent stages: first, passive alignment of optical components (collimator, isolator, lens) on the optical bench using alignment marks; second, active alignment of the light source assembly in X and Z directions followed by Y-direction pushing for solder joint formation. This segmentation allows each stage to be optimized independently, reducing overall manufacturing complexity while maintaining high alignment accuracy.
Solution Approach 2:
Optical components are passively aligned and fixed on the optical bench before the light source assembly is installed. Alignment marks and slots are pre-prepared on the optical bench, and adhesion materials are pre-applied to edges. This preliminary preparation eliminates the need for complex real-time adjustment during assembly, facilitating mass production while maintaining precision.
2Loss of energy
If three-dimensional active alignment is implemented to reduce power loss, then optical signal transmission efficiency is improved, but production time and process complexity increase
Solution Approach 1:
The light source assembly is designed with movable characteristics during the alignment process, allowing active adjustment in X and Z directions followed by a pushing action in the Y direction. This dynamic alignment approach enables precise three-dimensional positioning to minimize power loss, while the automated pushing mechanism reduces the time required compared to manual adjustment.
Solution Approach 2:
Optical feedback is used during active alignment to monitor and optimize the coupling efficiency between the light source and optical components. This feedback mechanism enables real-time adjustment of alignment parameters to minimize power loss, while automated control systems process the feedback quickly to reduce overall production time.
3Reliability
If precise alignment of laser light source with single mode fiber is achieved to improve transmission quality, then optical coupling efficiency is improved, but manufacturing difficulty increases
Solution Approach 1:
An optical bench with alignment marks and slots serves as an intermediary structure between the light source assembly and the final optical coupling. This intermediary provides a stable reference framework that simplifies the alignment process, enabling precise positioning of optical components without requiring direct complex manipulation of the light source and fiber themselves.
Solution Approach 2:
The alignment process transitions from purely mechanical adjustment to a hybrid approach combining active optical alignment with automated pushing mechanisms. The light source assembly is actively aligned in X and Z directions using optical feedback, then pushed in the Y direction to form solder joints. This substitution reduces manual intervention and simplifies the manufacturing process while maintaining high transmission quality.
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 three-dimensional alignment of optical components, reducing power loss during signal transmission and improving the efficiency of single channel and multi-channel optical transceivers, such as PSM4 and CWDM4 technologies, by ensuring accurate coupling of light sources with optical fibers.
Implementation Method 1
forming a solder joint between the optical bench and the light source assembly at the edges
Data Source
AI summary
A method and a system for active alignment of a light source assembly along three dimensions in an optical bench plane are provided. The light source assembly, preferably a laser diode on its sub-mount, is actively aligned in three dimensions, longitudinal, transection and vertical along the optical bench. The light source assembly is attached on edge of the optical bench, via adhesion processes, such as solder welding. Optical components such as collimator lens, isolator, etc are first passively aligned on the optical bench using alignment marks and epoxy slots provided on the surface of the optical bench. Then, laser diode, mounted on a laser diode sub-mount, is aligned in X and Z direction. Thereafter, the light source assembly is pushed towards the edge of the optical bench and attached with the edge via a solder joint. Also, a compensator can be actively aligned until the optimum light intensity achieved.