Direct-Drive Region-Less Polymer Modulator for Low-Voltage Silicon Integration
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Solution Overview
Problem
Current polymer modulators face challenges in achieving low cost, small size, and efficient optical alignment, with inefficiencies in poling due to voltage division in three-layer modulators and the need for external rf drivers, leading to high costs and complex integration processes.
Innovation Solution
A direct-drive region-less polymer modulator is integrated onto a common platform with a multilayer waveguide, featuring a passive core and electro-optic polymer active components that are polled to align dipoles, allowing for efficient modulation without external drivers, using materials with high electro-optic coefficients and matched cladding layers for optimized poling and adiabatic light transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a three-layer modulator structure is used, then the modulator can be fabricated with cladding/core/cladding layers, but the poling efficiency deteriorates due to voltage division among the three layers
Solution Approach 1:
The patent extracts the electro-optic polymer from the traditional three-layer cladding/core/cladding structure and places it directly in contact with the silicon core, eliminating the intermediate cladding layers that cause voltage division. This creates a region-less modulator where the electro-optic polymer forms the active modulation region directly on the silicon waveguide core.
Solution Approach 2:
The patent transitions from a vertical three-layer stack structure to a lateral integration approach where the electro-optic polymer is deposited directly on the silicon core surface. This dimensional change eliminates the voltage division problem by removing the intermediate layers while maintaining the modulator functionality.
2Reliability
If external RF drivers are used to drive the modulator, then the modulator can operate at high performance, but the cost and device complexity increase
Solution Approach 1:
The patent designs the modulator to be self-driven by directly coupling the silicon waveguide core with the electro-optic polymer, eliminating the need for external RF drivers. The silicon photonics platform itself provides the driving capability through its inherent electrical-optical conversion properties, making the system self-sufficient.
3Ease of manufacture
If traditional alignment and packaging processes are used, then components can be assembled, but the process takes lots of time and increases cost
Solution Approach 1:
The patent merges the laser source and modulator functions into a single integrated silicon photonics platform. The electro-optic polymer is directly deposited on the silicon waveguide core in the same fabrication process, eliminating the need for separate alignment and packaging steps for multiple components.
Solution Approach 2:
The silicon photonics platform serves multiple functions simultaneously: it acts as the waveguide core, provides electrical-optical conversion for direct driving, and serves as the substrate for electro-optic polymer deposition. This multi-functionality reduces the number of separate components and assembly steps.
4Power
If Si-organic-hybrids with short length are used, then the Vπ-L product is reduced, but the device size and integration flexibility are limited
Solution Approach 1:
The patent changes the key parameter from fixed short length to variable length by enabling direct integration of electro-optic polymer with silicon waveguides of any length. This allows optimization of the Vπ-L product while maintaining integration flexibility, as the modulation length can be adjusted according to specific application requirements without being constrained by hybrid structure limitations.
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
The solution enables efficient, high-performance multi-GHz operation at low voltage without external drivers, reducing costs and complexity, and allows for integration with lasers on a common platform with improved optical alignment and reduced size.
Implementation Method 1
A shaped electro-optic polymer active component has a surface abutting a surface of a central portion of the passive core region. The shaped electro-optic polymer active component is polled to align dipoles and promote modulation of light
Implementation Method 2
The top cladding layer encloses the shaped electro-optic polymer active component and is designed to produce adiabatic transition of light waves traveling in the passive core region into the shaped electro-optic polymer active component
Data Source
AI summary
A direct-drive region-less polymer modulator includes a waveguide having a first cladding layer, a passive core with a surface abutting the first cladding layer, the passive core extending to an optical input and an optical output. A shaped electro-optic polymer active component with a surface abutting the passive core region, the shaped component being polled to align dipoles and promote modulation of light and having a length that extends only within a modulation area defined by modulation electrodes. A second cladding layer enclosing the shaped component and designed to produce adiabatic transition of light waves traveling in the passive core region into the shaped component to travel the length of the shaped component and return to the passive core region. A portion of the multilayer waveguide defining the polymer modulator as a direct-drive polymer modulator.