On-Chip Electro-Absorption Modulator With Integrated Inductive Peaking
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Solution Overview
Problem
Existing electro-absorption modulators (EAMs) face challenges in achieving high modulation bandwidth and reducing system complexity while maintaining low power consumption, often relying on external components for inductive peaking that are poorly controlled and limited by packaging constraints.
Innovation Solution
Integrating on-chip termination inductors and biasing networks within photonic integrated circuits (PICs) to enable inductive peaking, eliminating the need for external components and enhancing modulation bandwidth through differential drive configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If external components are used for inductive peaking, then modulation bandwidth can be improved, but system complexity increases and packaging becomes constrained
Solution Approach 1:
The patent merges the inductive peaking function with the on-chip biasing network by integrating an inductor directly into the biasing circuitry. This combination eliminates the need for separate external inductive peaking components while achieving the desired modulation bandwidth enhancement, thereby reducing system complexity and packaging constraints
2Speed
If external components are used for inductive peaking, then modulation bandwidth can be improved, but packaging constraints are increased
Solution Approach 1:
The inductive peaking function is merged with the on-chip biasing network, integrating the inductor directly into the existing circuit footprint. This eliminates the need for additional external components and associated packaging space, achieving modulation bandwidth improvement without increasing packaging area
3Device complexity
If on-chip termination inductors are integrated, then system complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The biasing network is designed to provide self-adjusting characteristics that compensate for manufacturing variations in the integrated inductor. The circuit topology and component values are selected to provide tolerance immunity, allowing the system to maintain performance across process variations without requiring ultra-precise manufacturing
Data Source
AI summary
A photonic integrated circuit (PIC) includes an integrated on-chip electro-absorption modulator (EAM) having a first electrode and a second electrode, the first electrode and second electrode including an anode and a cathode. The PIC includes at least a first biasing network electrically coupled to the first electrode for providing termination and biasing to the EAM. The first biasing network includes at least a first inductor formed on the PIC.