Optical Coupling Carrier Frame Alignment for Silicon Photonics
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Solution Overview
Problem
The challenge in high-bandwidth optical communication systems is ensuring proper alignment and efficient data transfer between silicon-based laser sources and optical cables, particularly as the size of transceiver devices decreases and bandwidth increases, requiring innovative optical coupling assemblies that can withstand solder reflow processes without alignment loss.
Innovation Solution
The optical coupling assembly incorporates an optical coupling carrier frame with jumper cable assemblies featuring a jumper ferrule and optical turn assembly, which are precision-aligned with silicon photonics inputs/outputs and utilize wafer-level optics for total internal reflection, ensuring accurate signal turning and alignment during solder reflow processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the size of transceiver devices decreases to increase bandwidth, then the bandwidth increases, but the alignment precision between transceiver device and optical cable assembly deteriorates
Solution Approach 1:
An optical coupling carrier frame is introduced as an intermediary component between the transceiver device and optical cable assembly. The frame includes a precision-machined carrier frame with an integrated circuit opening and connector portions that provide reference structures for alignment, enabling accurate positioning of miniaturized transceiver devices while maintaining high bandwidth capability
Solution Approach 2:
The optical coupling carrier frame is pre-assembled with connector portions and jumper cable assemblies before final integration with the transceiver device. This preliminary assembly establishes precise geometric relationships and alignment references in advance, ensuring that when the miniaturized transceiver is integrated, proper alignment is maintained without requiring complex real-time adjustment mechanisms
2Productivity
If advanced silicon-based laser systems are used to increase bandwidth, then the bandwidth increases, but the alignment stability during solder reflow process deteriorates
Solution Approach 1:
The optical coupling carrier frame is designed with thermally conductive materials and heat dissipation features that cushion the silicon-based laser system against thermal shocks during solder reflow. The frame structure includes thermal management elements that absorb and distribute heat evenly, preventing thermal expansion-induced misalignment of the precision optical components during the high-temperature soldering process
Solution Approach 2:
The optical coupling carrier frame utilizes materials with matched coefficients of thermal expansion (CTE) to the silicon-based laser substrate. By carefully selecting frame materials whose CTE parameters match the silicon photonics, the design compensates for differential thermal expansion during solder reflow, maintaining alignment stability despite temperature fluctuations in the high-bandwidth system
3Volume of moving object
If the size of transceiver devices decreases, then the device size decreases, but the ease of alignment with optical cable assembly deteriorates
Solution Approach 1:
The optical coupling system is segmented into distinct functional modules: the carrier frame, connector portions, jumper cable assemblies, and the transceiver device. This segmentation allows each component to be optimized independently - the transceiver can be miniaturized while the carrier frame provides the necessary alignment infrastructure, making the overall system easier to align despite the small size of individual components
Solution Approach 2:
The design replaces complex mechanical adjustment mechanisms with precision-machined geometric reference structures in the carrier frame. Instead of requiring mechanical alignment tools or adjustable mounting hardware for the miniaturized transceiver, the frame incorporates precisely engineered opening dimensions and connector positions that provide passive alignment references, significantly easing the alignment process for small devices
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 enables reliable and efficient optical signal transfer across high-bandwidth systems by maintaining alignment and optical coupling integrity through the solder reflow process, addressing the challenges of miniaturization and increased bandwidth in silicon-based laser systems.
Implementation Method 1
utilize wafer-level optics for total internal reflection, ensuring accurate signal turning
Data Source
AI summary
Optical coupling assemblies for silicon-based optical sources are disclosed. In one embodiment, an optical coupling assembly includes an optical coupling carrier frame and a jumper cable assembly. The optical coupling carrier frame includes a frame portion defining an integrated circuit opening operable to receive an integrated circuit assembly, and a connector portion extending from the frame portion. The connector portion includes a channel operable to receive an optical connector of an optical cable assembly. The jumper cable assembly is disposed within the connector portion. The jumper cable assembly includes a plurality of jumper optical fibers, a jumper ferrule coupled to a first end of the plurality of jumper optical fibers, and an optical turn assembly coupled to a second end of the plurality of jumper optical fibers. The optical turn assembly is operable to optically turn optical signals propagating within the optical turn assembly.