Active Silicon Optical Bench Low Inductance Drive
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Solution Overview
Problem
Integrated photonic modules face challenges in efficiently driving laser diodes due to high impedance and inductance in traditional wire bonding and printed circuit board connections, requiring components to be closely placed to minimize these issues.
Innovation Solution
An active silicon optical bench with alternating thin insulating and conducting layers is used to create low-impedance transmission lines that match the input impedance of laser diodes, allowing for precise mounting and electrical connections while maintaining component proximity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding or printed circuit board connections are used to electrically connect the optoelectronic chip to other components, then electrical connections can be established, but high impedance and inductance are introduced requiring components to be closely placed
Solution Approach 1:
The patent merges the optical bench substrate with integrated electrical interconnect structures, combining the mechanical mounting function with the electrical connection function into a single integrated component. This eliminates the need for separate wire bonding or PCB connections, thereby reducing inductance and impedance while removing component placement constraints.
Solution Approach 2:
The patent introduces an intermediate electrical interconnect layer integrated into the optical bench substrate that serves as a mediator between the optoelectronic chip and external electrical connections. This intermediate structure provides low-inductance, low-impedance pathways without requiring close component placement.
2Power
If components are closely placed to minimize transmission line length and reduce inductance, then electrical drive efficiency improves, but component placement flexibility is reduced
Solution Approach 1:
The patent transitions from planar component placement to three-dimensional integrated structures, with electrical interconnects extending through multiple layers of the optical bench substrate. This vertical dimensionality allows components to be placed more freely while maintaining short electrical pathways through the vertical interconnect structure.
Solution Approach 2:
The optical bench substrate provides self-service by integrating the electrical interconnect structures directly into its fabrication process, eliminating the need for separate wire bonding or PCB assembly steps. This self-integrated approach maintains drive efficiency while providing placement flexibility.
3Ease of manufacture
If traditional wire bonding or PCB traces are used for electrical connections, then manufacturing is simpler, but inductance and impedance are high affecting laser diode driving efficiency
Solution Approach 1:
The patent replaces the mechanical wire bonding process with integrated semiconductor fabrication techniques for creating electrical interconnects. This substitution maintains manufacturing simplicity through standard semiconductor processes while achieving superior electrical performance with lower inductance and impedance.
Solution Approach 2:
The patent employs composite material structures in the electrical interconnects, combining conductive layers with dielectric materials in a multi-layer integrated structure. This composite approach optimizes both electrical performance (low inductance and impedance) and manufacturability through established semiconductor fabrication processes.
Data Source
AI summary
An integrated photonic module includes a semiconductor substrate configured to serve as an optical bench. Alternating layers of insulating and conducting materials are deposited on the substrate and patterned so as to define electrical connections. An optoelectronic chip is mounted on the substrate in contact with the electrical connections. A drive chip is mounted on the substrate so as to provide an electrical drive current to the optoelectronic chip via the electrical connections.