Double-Nested Quadrature Modulator Phase Control Without Extra Hardware
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical modulators for optical communications systems require additional specialized components and substantial processing to achieve accurate phase control, leading to increased costs and complexity, which hinders the deployment of dense optical communications networks.
Innovation Solution
A double-nested quadrature modulator system that applies phase dithers to inner Mach-Zehnder interferometers and adjusts the outer interferometer based on an initial error term, eliminating the need for specialized components and complex calculations by using a controller to achieve precise phase control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional specialized components and substantial processing are used for phase control, then phase control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a double-nested quadrature modulator architecture where inner Mach-Zehnder interferometers are nested within an outer interferometer. This nested structure enables phase control functionality to be achieved through the interaction of multiple interferometer stages, eliminating the need for additional specialized components while maintaining control accuracy through the nested configuration's inherent properties
Solution Approach 2:
The patent employs a feedback mechanism where a controller monitors the output of the double-nested interferometer system and adjusts the phase dithers applied to the inner interferometers. This closed-loop feedback control enables accurate phase control by continuously correcting for deviations, achieving precision without requiring additional specialized hardware components
2Measurement precision
If additional specialized components and substantial processing are used for phase control, then phase control accuracy is improved, but processing resources and cost increase
Solution Approach 1:
The double-nested interferometer system performs phase control functions through its own internal structure without requiring external specialized components or substantial processing resources. The nested interferometer configuration inherently provides the necessary phase modulation and control capabilities, with the system essentially controlling itself through the interaction of its constituent interferometer stages
Solution Approach 2:
The patent achieves phase control accuracy by dynamically adjusting phase dither parameters applied to the inner interferometers rather than relying on additional specialized components. The controller modifies these phase parameters in response to system state, enabling precise control through parameter modulation rather than hardware complexity
3Measurement precision
If complex processing is used for phase control, then phase control accuracy is improved, but deployment speed and cost-effectiveness decrease
Solution Approach 1:
The patent extracts and eliminates the need for complex processing and specialized components by leveraging the inherent properties of the double-nested interferometer structure. By taking out the dependency on additional hardware and complex processing, the system achieves phase control accuracy through the purified essential functionality of the nested interferometer configuration itself, enabling faster and more cost-effective deployment
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
Enables widespread, rapid deployment of optical communications networks with reduced costs and processing resources by achieving accurate phase control without additional hardware or complex processing, thus reducing the form factor.
Implementation Method 1
By changing the optical path lengths of the set of arms, the optical modulator can cause phase modulation to be applied to a beam
Implementation Method 2
An optical modulator for an optical system may include one or more Mach-Zehnder (MZ) interferometers to enable modulation control for the optical system
Implementation Method 3
When two arms of the MZ interferometer have different phase modulations, the optical modulator can control an optical intensity of the beam
Data Source
AI summary
In some implementations, a controller may apply a set of phase dithers to a first inner Mach-Zehnder (MZ) interferometer and a second inner MZ interferometer, the first inner MZ interferometer and the second inner MZ interferometer being included in an outer MZ interferometer, the set of phase dithers including a first in-phase dither state and a second in-phase dither state and including a first anti-phase dither state and a second anti-phase dither state. The controller may determine an initial error term based at least in part on the set of phase dithers. The controller may adjust, based on the initial error term, the outer MZ interferometer to a target phase associated with a target error term, wherein respective branches of at least one of the first MZ interferometer or the second MZ interferometer are adjusted differentially.