Mach-Zehnder Interferometer Linearity via Microring Resonator
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Solution Overview
Problem
Traditional Mach-Zehnder interferometers (MZIs) exhibit sinusoidal transmission, which is not ideal for matrix weighing in optical neural networks, requiring complex circuitry and training logic due to nonlinearity issues.
Innovation Solution
The proposed optical device incorporates an over-coupled microring resonator (MRR) optically coupled to one of the MZI's waveguide arms, allowing the MRR to operate in both resonance and off-resonance states, aligning the superlinear phase response with the peaks of the MZI's output to minimize nonlinearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional Mach-Zehnder interferometer is used, then the device structure is simple, but the transmission nonlinearity is high which requires complex circuitry and training logic
Solution Approach 1:
An over-coupled microring resonator is introduced as an intermediary component optically coupled to one waveguide arm of the MZI. The MRR acts as a mediator that modifies the phase response of the interferometer, transforming the sinusoidal transmission into a linearized response without requiring complex circuitry or training logic
Solution Approach 2:
The operating parameters of the MZI are changed by coupling it with an over-coupled microring resonator. This changes the phase response characteristics from a standard sinusoidal pattern to a linearized pattern, improving transmission linearity while maintaining device simplicity
2Manufacturing precision
If the MRR operates in resonance state, then the phase response is enhanced, but the nonlinearity near peaks increases
Solution Approach 1:
The microring resonator is designed with specific local characteristics - being over-coupled rather than critically or under-coupled. This local quality change in the coupling regime allows the system to achieve linearized phase response while minimizing nonlinearity near peaks, as the over-coupling condition creates a broader, flatter resonance profile
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 configuration achieves enhanced linearity in the optical output, reducing nonlinearity near peaks and improving bit precision by up to 2 bits compared to conventional MZIs, simplifying electronic control circuits and increasing system energy efficiency.
Implementation Method 1
an over-coupled microring resonator (MRR) optically coupled to one of the waveguide arms, allowing the MRR to operate in both resonance and off-resonance states
Implementation Method 2
Mach-Zehnder interferometers (MZIs) exhibit a sinusoidal transmission
Data Source
AI summary
Example optical devices having a Mach-Zehnder interferometer (MZI) with improved linearity are presented. An example optical device may include an MZI and a microring resonator (MRR) optically coupled to any one of a first optical waveguide arm or a second optical waveguide arm, where the MRR is operable in a resonance state and in an off-resonance state during operation of the optical device. The MZI includes a length difference between the first optical waveguide arm and the second optical waveguide arm thereby achieving a quarter-period phase delay between optical signals of the first optical waveguide arm and the second optical waveguide arm such that a superlinear transmission region of the microring resonator is aligned with peaks of an optical output of the MZI improving linearity of the optical output of the MZI.