Multiple Traveling Waveguides for 100+ GHz Optical Modulation
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Solution Overview
Problem
Legacy semiconductor devices using single traveling waveguides are limited to less than 50 GHz electro-optical bandwidth and lack high-performance modulation efficiency, while multiple TWs with identical characteristics provide only limited frequency response improvements.
Innovation Solution
Implementing a multiple traveling waveguide structure with varied PN junctions, PN doping levels, and RF waveguides to achieve an overall optical modulation beyond 100 GHz by synthesizing EO frequency responses in each TW, utilizing distributed drivers and semiconductor operational amplifiers to boost RF signals and match optical delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single traveling waveguide is used, then the device structure is simple, but the electro-optical bandwidth is limited to less than 50 GHz
Solution Approach 1:
The patent divides a single waveguide into multiple traveling waveguides (first TW, second TW, third TW, fourth TW) with different characteristics. Each TW has distinct PN junctions, doping levels, and lengths, allowing them to operate at different frequency ranges. This segmentation enables the combined system to achieve bandwidth exceeding 100 GHz while maintaining manageable structural complexity through modular design.
Solution Approach 2:
Each traveling waveguide is designed with localized variations in PN junction characteristics, doping levels, and physical dimensions. The first TW has higher doping and shorter length for high-frequency operation, while the fourth TW has lower doping and longer length for lower-frequency operation. This local quality differentiation allows each segment to optimize performance for specific frequency bands, collectively achieving broad bandwidth.
2Speed
If multiple traveling waveguides with identical characteristics are used, then some frequency response improvement is achieved, but modulation efficiency remains limited
Solution Approach 1:
The patent implements distinct local qualities in each traveling waveguide through varied PN junction designs, doping concentrations, and lengths. The first TW uses higher doping levels for fast response at high frequencies, while the fourth TW uses lower doping for efficient low-frequency modulation. This differentiation enables each TW to excel at its designated frequency range, achieving both improved frequency response and high modulation efficiency across the entire bandwidth.
Solution Approach 2:
The patent systematically changes key parameters across the four traveling waveguides: PN junction area, doping level, waveguide length, and electrode configuration. These parameter variations are optimized to create complementary frequency responses that combine to achieve >100 GHz bandwidth with high modulation efficiency at all frequencies, rather than uniform characteristics that limit overall performance.
3Productivity
If distributed drivers and semiconductor operational amplifiers are added to boost RF signals, then modulation efficiency is enhanced, but device complexity increases
Solution Approach 1:
The patent combines distributed drivers with semiconductor operational amplifiers (SOAs) in an integrated architecture. The SOAs are positioned at strategic points along the waveguide structure to amplify RF signals where needed, while the distributed drivers provide localized signal boosting. This merging of components achieves high modulation efficiency throughout the 100+ GHz bandwidth while consolidating functionality to manage overall device complexity.
Solution Approach 2:
The semiconductor operational amplifiers serve as intermediary components between the distributed drivers and the traveling waveguides. They buffer and condition RF signals, ensuring optimal signal levels and impedance matching across different sections. This intermediary function enhances modulation efficiency by preventing signal degradation while adding minimal complexity through standardized amplifier circuits.
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 high-baud rate modulation applications and Tb/s data center connections with enhanced modulation efficiency, supporting frequencies up to 100 GHz and beyond, applicable to Pulse-amplitude modulation, Quadrature amplitude modulation, and subcarrier modulation.
Implementation Method 1
synthesizing EO frequency responses in each TW to achieve an overall optical modulation beyond 100 GHz
Data Source
AI summary
Embodiments described herein may be related to apparatuses, processes, and techniques directed to a multiple traveling waveguide structure to synthesize EO frequency responses used for optical modulation. Multiple traveling waveguide devices may include a plurality of traveling waveguides, each with different characteristics resulting in a different EO response within a target frequency range. These different characteristics may be achieved by varying the PN junction, PN doping level, optical waveguides, RF waveguides and the like for each traveling waveguide. The multiple traveling waveguide structure is formed by combining each traveling waveguide in a serial and/or parallel fashion, and then iteratively optimized based on artificial intelligence (AI) training sequences, to achieve an overall optical modulation beyond 100 GHz. Other embodiments may be described and/or claimed.