Compact PAM4 Optical Modulator Using Ring Resonators
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Solution Overview
Problem
Current optical signal modulators for generating four-level pulse amplitude modulation (PAM4) signals are bulky and inefficient, struggling to achieve high data rates due to the need for external components to maintain phase and power ratios, which limits their performance in electronic systems.
Innovation Solution
A compact optical signal modulator using a symmetrical directional coupler and ring modulators to split and phase-shift optical carrier signals, achieving a 90° phase difference and adjustable power ratios without external components, doubling the data rate by combining modulated signals into a PAM4 format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external components are used to maintain phase and power ratios in optical signal modulators, then phase stability is improved, but device complexity and size increase
Solution Approach 1:
The patent combines the phase control function into the ring modulator structure itself, where the first and second ring modulators inherently provide the required phase relationship through their integrated design. This eliminates the need for separate external phase control components, thereby maintaining phase stability while reducing device complexity.
Solution Approach 2:
The patent extracts the phase control function from external components and integrates it directly into the ring modulator structure. By taking out the separate phase control mechanism and embedding it within the modulator, the system achieves phase stability without requiring additional external components.
2Reliability
If external decibel adjustment components are used to maintain power ratios, then power balance is improved, but device size increases
Solution Approach 1:
The patent merges the power ratio control function into the ring modulator structure, where the first and second ring modulators are designed to inherently provide the required power relationship. This integration eliminates the need for separate external decibel adjustment components, thereby maintaining power balance while reducing device size.
Solution Approach 2:
The patent extracts the power adjustment function from external decibel components and integrates it directly into the ring modulator design. By embedding the power control mechanism within the modulator structure, the system achieves power balance without requiring additional external adjustment components.
3Area of stationary object
If compact modulator design is implemented without external components, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric coupling between the first and second ring modulators, where the coupling coefficients are deliberately designed to be different. This asymmetric design inherently compensates for manufacturing variations and maintains the required power and phase relationships, thereby achieving compact size without excessively stringent manufacturing precision requirements.
4Productivity
If data rate is doubled to 100 Gigabits/second, then productivity is improved, but signal quality maintenance becomes more difficult
Solution Approach 1:
The patent employs dynamic modulation schemes where the first and second ring modulators can adapt their operation to maintain signal quality at high data rates. The modulators are designed to dynamically adjust their characteristics to preserve signal integrity during high-speed PAM4 signal generation, thereby achieving 100 Gigabits/second data rate while maintaining acceptable signal quality.
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 a compact and efficient optical signal modulator that doubles the data rate to 100 Gigabits/second, maintaining a 90° phase difference and power balance within the modulator, enhancing performance in electronic systems without requiring external phase control or decibel adjustment components.
Implementation Method 1
a first part of the optical carrier signal is received and a second part of the optical carrier signal is received, wherein the first part of the optical carrier signal has a 90 degree phase difference from the second part of the optical carrier signal
Implementation Method 2
modulating the optical signal by controlling light absorption in the waveguide ring
Data Source
AI summary
A directional coupler is configured to receive a continuous light waveform and split the waveform into two carrier signals. Ring modulators are configured to receive the carrier signals and binary data and modulate the carrier signals based on the binary data. A combiner is configured to combine the modulated carrier signals into a four-level pulse amplitude modulation (PAM4) signal.