Optical DAC Phase Segmentation for Discrete Power Output
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Solution Overview
Problem
Integrated chip components face challenges in scaling due to leakage currents and process variations, limiting the performance of optical computing systems, which typically rely on electronic digital-to-analog converters (DACs).
Innovation Solution
An optical digital-to-analog converter (DAC) using a Mach-Zehnder modulator (MZM) with phase shifter segments of differing lengths and p-n junctions to introduce controlled phase shifts, converting digital signals into analog optical outputs with discrete power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic digital-to-analog converters (DACs) are used in optical computing systems, then the systems can process digital signals, but the performance is limited due to leakage currents and process variations in integrated chip components
Solution Approach 1:
The patent replaces electronic DAC components with an optical DAC system using a Mach-Zehnder modulator. This substitution eliminates the harmful leakage currents and process variations associated with electronic components by using optical interference and phase modulation instead, thereby improving reliability without being constrained by electronic component limitations.
2Adaptability or versatility
If phase shifter segments of differing lengths are used in the Mach-Zehnder modulator, then multiple discrete optical output powers can be generated, but the device complexity increases
Solution Approach 1:
The Mach-Zehnder modulator is divided into multiple phase shifter segments with differing lengths, where each segment can be independently controlled to introduce specific phase shifts. This segmentation enables the generation of multiple discrete optical output powers by combining different phase shift configurations, achieving adaptability while managing complexity through modular design.
Solution Approach 2:
Different phases of the optical signal are applied to different waveguide paths with specific phase shifter segments. By introducing different phase shifts in different regions (waveguide paths) of the modulator, the system achieves multiple discrete optical output powers through localized phase control rather than uniform modification across the entire device.
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 optical DAC efficiently generates multiple discrete optical output powers corresponding to digital inputs, enhancing the performance of optical computing systems by leveraging photonic technology.
Implementation Method 1
A Mach-Zehnder modulator (MZM) is an interferometric structure that uses constructive and/or destructive interference to modulate an electromagnetic wave (e.g., light)
Implementation Method 2
A phase shift may be selectively introduced into a beam extending along one of the paths
Data Source
AI summary
The present disclosure relates to an optical digital-to-analog converter (DAC). The optical DAC includes a first waveguide path configured to receive a first optical signal and a second waveguide path configured to receive a second optical signal. A first phase shifter segment interfaces with the first and second waveguide paths. The first phase shifter segment is configured to selectively generate a first phase shift between the first optical signal and the second optical signal in response to a first digital input. A second phase shifter segment interfaces with the first and second waveguide paths. The second phase shifter segment is configured to selectively generate a second phase shift between the first optical signal and the second optical signal in response to a second digital input. The first digital input and the second digital input correspond to different bits of a digital signal.