Monolithic Laser and Polymer Modulator Integration
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Solution Overview
Problem
Current laser modulator systems are not optimized for low cost, size, and alignment efficiency, requiring significant time and resources for component alignment and testing, especially at high signaling speeds above 10 Gbps.
Innovation Solution
Integration of a monolithic photonic integrated circuit with a laser and polymer modulator on a common platform, using electro-optic polymer waveguides with high electro-optic coefficients and suitable glass transition temperatures, allowing for efficient optical coupling and direct drive without an external driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If discrete lasers are positioned next to discrete modulators, then higher performance signaling above 10 Gbps can be attained, but it takes lots of time to align the components, place them, package them, and test them
Solution Approach 1:
The patent merges the laser and modulator components into a single integrated photonic device structure, where the laser gain medium and modulator electro-optic material are combined in one device. This eliminates the need for separate alignment and assembly of discrete components, thereby reducing assembly time while maintaining high signaling speeds above 10 Gbps.
2Speed
If discrete lasers are positioned next to discrete modulators, then higher performance signaling can be attained, but it is not optimized for low cost and space/size requirements
Solution Approach 1:
By combining the laser and modulator into a single integrated device, the overall volume and space requirements are reduced compared to separate discrete components. The merged structure shares common elements and reduces the total device footprint while maintaining high signaling performance.
Solution Approach 2:
The integrated photonic device performs multiple functions (laser generation and modulation) within a single structure, making the device more versatile and space-efficient. This multi-functionality approach reduces the need for separate dedicated components for each function.
3Speed
If discrete lasers are positioned next to discrete modulators, then higher performance signaling can be attained, but it requires lots of time to align the components
Solution Approach 1:
The integration of laser and modulator into a single device eliminates the alignment interface between separate components. The merged structure has fixed internal geometry, removing the need for precision alignment during assembly and thereby reducing manufacturing complexity.
4Ease of manufacture
If polymer modulators are used with high electro-optic coefficients, then efficient coupling and direct drive capabilities are achieved, but the device complexity increases
Solution Approach 1:
The merging of laser and modulator functions into a single integrated device simplifies the overall system architecture. The electro-optic polymer material is integrated directly with the laser gain medium, creating a unified structure that achieves efficient coupling without requiring complex external driver circuits or additional coupling components.
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 higher performance at multi-GHz speeds with reduced size and cost, efficient coupling, and simplified alignment, achieving direct drive capabilities with lower voltage requirements.
Implementation Method 1
The electro-optic polymer core having an electro-optic coefficient (r33) ideally greater than 250 pm/V
Implementation Method 2
a monolithic laser formed in/on the platform
Data Source
AI summary
A monolithic photonic integrated circuit includes a platform, a monolithic laser formed in/on the platform, and an electro-optic polymer modulator monolithically built onto the platform and optically coupled to the monolithic laser. The polymer modulator is optically coupled to the monolithic laser by waveguides including electro-optic polymer waveguides. The electro-optic polymer modulator and the electro-optic polymer waveguides including an electro-optic polymer core and top and bottom electro-optic polymer cladding layers. The electro-optic polymer core having an electro-optic coefficient (r33) greater than 250 pm/v, and a Tg 150° C. to 200° C., and the top and bottom electro-optic polymer cladding layers having a Tg approximately the same as the Tg of the electro-optic polymer core.