Microring Resonator Photodiode Segmentation for High Bandwidth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical systems face limitations in bandwidth and optical power due to the use of photodiodes for monitoring optical signals, which restrict high-speed operation and require additional fabrication steps and materials like germanium or III-V semiconductor integration, leading to increased complexity and cost.
Innovation Solution
A double microring structure optical resonating device with a separate microring resonator photodiode, formed using silicon without the need for germanium or III-V semiconductor materials, allows for improved photodetection and wavelength-selective measurement without impacting the operation of the microring resonator, enabling higher bandwidth and output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional photodiodes are used for monitoring optical signals, then optical signal measurement is achieved, but bandwidth and optical power are limited
Solution Approach 1:
The invention separates the microring resonator from the photodiode into two distinct components. The microring resonator handles optical signal processing and resonance, while the separate photodiode performs photodetection. This segmentation allows each component to be optimized independently, enabling the photodiode to operate at higher bandwidths without compromising the resonator's optical power and quality factor.
2Measurement precision
If photodiodes are integrated with microring resonator, then photodetection is enabled, but additional fabrication steps and materials (germanium or III-V semiconductor) are required
Solution Approach 1:
The photodiode is extracted from the microring resonator structure and placed as a separate component. This eliminates the need for complex heterogeneous integration processes such as germanium epitaxial growth or III-V semiconductor integration. The separate photodiode can be fabricated using standard silicon photodiode processes, significantly reducing fabrication complexity while maintaining photodetection functionality.
3Measurement precision
If conventional monitoring techniques are used, then optical signal measurement is possible, but high-speed operation is restricted
Solution Approach 1:
By segmenting the system into a separate microring resonator and photodiode, the photodiode can be optimized for high-speed operation without being constrained by the resonator's optical power requirements. The separate photodiode can use optimized junction designs and readout circuits achieving 70 GHz bandwidth, enabling high-speed optical communication applications.
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 proposed solution achieves a 3 dB bandwidth of 70 GHz frequency range and over 50% improvement in channel crosstalk for DWDM applications, reducing material costs and process complexity while maintaining high-density data transmission capabilities.
Implementation Method 1
A portion of an optical signal passing through the waveguide is coupled into the microring resonator
Implementation Method 2
The microring resonator photodiode is formed adjacent to and sufficiently close to the microring resonator to provide evanescent coupling of the light between the microring resonator photodiode and the microring resonator
Data Source
AI summary
Examples described herein relate to an optical resonating device. The optical resonating device includes a primary waveguide, a microring resonator, and a microring resonator photodiode. The primary waveguide allows a passage of an optical signal. The microring resonator is formed adjacent to the primary waveguide to couple therein a portion of the optical signal passing through the primary waveguide. Furthermore, the microring resonator photodiode is formed adjacent to the microring resonator to measure an intensity of the portion of the optical signal coupled into the microring resonator.