Multistage Photodiode Detector Segmentation for Silicon Photonics
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Solution Overview
Problem
Existing optoelectronic devices face challenges in efficiently integrating active components like electro-absorption modulators, lasers, and photodiodes from the same material system, leading to inefficiencies due to differing optimization requirements for each component.
Innovation Solution
The development of a multistage photodiode detector comprising a series of photodiode elements connected in series, formed from the same material system as other components, allowing for efficient power monitoring and reduced size footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If photodiodes are made long to maximize absorption efficiency, then conversion efficiency improves, but device size and integration difficulty increase
Solution Approach 1:
The photodiode is divided into multiple discrete elements connected in series, allowing the total absorption length to be achieved through multiple shorter segments rather than one long continuous structure. This segmentation enables better integration compatibility while maintaining total absorption efficiency.
Solution Approach 2:
Instead of achieving absorption through a single long linear path, the patent uses multiple photodiode elements arranged in a series configuration that effectively utilizes dimensional space differently, allowing compact integration while maintaining total absorption length through the series connection architecture.
2Ease of manufacture
If same material system is used for all active components, then manufacturing simplicity and cost improve, but component optimization performance deteriorates
Solution Approach 1:
Different regions of the integrated circuit are designed with locally optimized structures and parameters tailored to specific component functions (laser, modulator, photodiode), while all using the same base material system. This allows manufacturing simplicity to be maintained while achieving component-specific optimization through local structural variations.
Solution Approach 2:
The patent optimizes different structural and operational parameters for each component type within the same material system, such as varying waveguide dimensions, doping concentrations, and device geometries to achieve component-specific performance optimization while maintaining manufacturing compatibility.
3Reliability
If photodiode operates at wavelength optimized for EAM modulator, then modulator performance improves, but photodiode absorption efficiency degrades
Solution Approach 1:
The use of multiple photodiode elements in series allows the system to accumulate absorption across multiple stages, compensating for the reduced absorption efficiency of individual elements operating at non-optimized wavelengths. Each segment contributes to the total absorption, achieving overall efficiency despite wavelength constraints.
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 accurate power monitoring while adhering to material system constraints, optimizing performance across multiple components and reducing size limitations in silicon-based photonic integrated circuits.
Implementation Method 1
a multistage photodiode detector, comprising a plurality of photodiode elements connected in series, one of the photodiode elements of the plurality of photodiode elements being connected to the input waveguide and configured to receive the optical signal therefrom
Data Source
AI summary
An optoelectronic device. The device comprising: an input waveguide, which receives an optical signal; a multistage photodiode detector, comprising a plurality of photodiode elements connected in series, one of the photodiode elements of the plurality of photodiode elements being connected to the input waveguide and configured to receive the optical signal therefrom; and a first electrode and a second electrode, wherein the first electrode is connected to a first contact of each of the plurality of photodiode elements, and the second electrode is connected to a second contact of each of the plurality of photodiode elements.