Optical Demultiplexer Using Asymmetric Mach-Zehnder Interferometers
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Solution Overview
Problem
Current optical demultiplexers require separate components for demultiplexing signal and local oscillation lights, leading to increased device size, power consumption, crosstalk, and power loss due to the need for multiple asymmetric Mach-Zehnder interferometers and additional waveguide intersections.
Innovation Solution
An optical demultiplexer design that incorporates a single set of asymmetric Mach-Zehnder interferometers with phase shifters and monitor/control circuits to demultiplex both signal and local oscillation lights efficiently, reducing the number of waveguide intersections and optimizing power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate components are used for demultiplexing signal and local oscillation lights, then demultiplexing function is achieved, but device size increases
Solution Approach 1:
The patent combines the demultiplexing functions for both signal light and local oscillation light into a single integrated optical processing circuit. The circuit uses one set of asymmetric Mach-Zehnder interferometers to simultaneously handle both types of light, eliminating the need for separate demultiplexing components and thereby reducing device size while maintaining complete demultiplexing functionality.
Solution Approach 2:
The optical processing circuit is designed with universal functionality to perform multiple demultiplexing tasks simultaneously. The same circuit structure processes both signal light and local oscillation light through different paths, allowing a single component to serve multiple purposes and reduce overall device footprint.
2Adaptability or versatility
If multiple asymmetric Mach-Zehnder interferometers are used, then demultiplexing capability is improved, but power consumption increases
Solution Approach 1:
The patent merges the control functions into a single optical processing circuit that manages both signal and local oscillation light demultiplexing. By consolidating the interferometer structures and sharing control resources, the system achieves improved demultiplexing capability while reducing the total power consumption compared to having separate independent components.
3Adaptability or versatility
If multiple asymmetric Mach-Zehnder interferometers are used, then demultiplexing capability is improved, but crosstalk increases
Solution Approach 1:
The patent segments the optical paths into distinct routes for signal light and local oscillation light processing. By carefully designing the interferometer configurations and path separations, the system achieves high demultiplexing capability while minimizing unwanted optical coupling and crosstalk between different signal channels and between signal and local oscillation light paths.
4Ease of operation
If additional waveguide intersections are used, then signal routing is improved, but power loss increases
Solution Approach 1:
The patent merges the signal routing functions into an optimized waveguide structure with reduced intersection points. By integrating both signal and local oscillation light routing through a unified design, the system achieves flexible signal routing while minimizing the number of waveguide intersections that would otherwise cause optical power loss.
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 design reduces power consumption and crosstalk while maintaining effective demultiplexing performance, thereby minimizing device size and improving signal quality.
Implementation Method 1
asymmetric Mach-Zehnder interferometers, each including a pair of arms of different lengths... outputs... a first signal light component and a first local oscillation light with center wavelengths adjacent to each other
Data Source
AI summary
An optical demultiplexer includes a first optical-processing-circuit to include first to third AMZs, each including a pair-of-arms of different lengths, the first AMZ outputting, to the second AMZ, a first signal-light-component and a first local-oscillation-light with center wavelengths adjacent to each other among a plurality of signal-light-components and a plurality of local-oscillation-lights inputted to the pair-of-arms, and outputting, to the third AMZ, a second signal-light-component with a same center wavelength as the first local-oscillation-light and a second local-oscillation-light with the same center wavelength as the first signal-light-component, the second AMZ outputting the first signal-light-component and the first local-oscillation-light, which are inputted to the pair-of-arms from the first AMZ, to a second optical-processing-circuit and a third optical-processing-circuit, respectively, and the third AMZ outputting the second local-oscillation-light and the second signal-light-component, which are inputted to the pair-of-arms from the first AMZ, to the second optical-processing-circuit and the third optical-processing-circuit, respectively.