Switch Matrix With Integrated Polarization Controller
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Solution Overview
Problem
Photonic switches based on silicon on insulator (SOI) circuits require additional polarization controllers to adjust optical signals to a pre-defined state of polarization, leading to increased insertion loss and power consumption due to the need for separate components.
Innovation Solution
A photonic switch matrix incorporating 1x2 input switches with integrated polarization controllers, including Mach-Zehnder Interferometer structures and phase shifters, that split and mix optical beams to direct them to specific output ports, reducing the need for external polarization controllers and minimizing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate polarization controllers are used to adjust optical signals to a pre-defined state of polarization, then the photonic switch can operate with proper polarization control, but the insertion loss and power consumption increase due to additional components
Solution Approach 1:
The patent combines the polarization controller functionality directly into the photonic switch matrix structure. The polarization controllers are integrated as part of the switch fabric rather than being separate external components, which reduces the number of optical interfaces and coupling points, thereby reducing insertion loss while maintaining polarization control capability.
Solution Approach 2:
The photonic switch matrix is designed to perform multiple functions: switching and polarization control. By making the switch matrix universal enough to handle polarization adjustment internally, the system eliminates the need for dedicated external polarization controllers, reducing both component count and energy loss.
2Reliability
If separate polarization controllers are used to adjust optical signals, then the photonic switch can operate with proper polarization control, but the power consumption increases due to additional components
Solution Approach 1:
The polarization control functionality is merged into the photonic switch matrix, eliminating separate polarization controller components. This integration reduces the total power consumption by removing the power requirements of external polarization controllers while maintaining the same polarization control capability through the integrated structure.
3Reliability
If separate polarization controllers are used, then the photonic switch can operate with proper polarization control, but the device complexity increases due to additional components
Solution Approach 1:
The patent merges the polarization controller functionality into the photonic switch matrix structure. Instead of having separate polarization controller components connected to the switch, the polarization control elements are integrated within the switch fabric itself, reducing the total component count and simplifying the overall device architecture.
Solution Approach 2:
The photonic switch matrix is designed with universal functionality that encompasses both switching and polarization control operations. This multi-functionality allows the same structural elements to serve dual purposes, thereby reducing device complexity while maintaining comprehensive control capabilities.
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 integrated polarization control within the photonic switch matrix reduces insertion loss and power consumption while enabling efficient polarization adjustment, allowing for compact and efficient optical switching with lower component count.
Implementation Method 1
a polarization controller coupled to the input port for providing the pre-defined state of polarization of the optical beam, the polarization controller including at least one polarization controller stage comprising two optical paths associated with two polarization components of the optical beam
Implementation Method 2
an optical mixer stage coupled to the two optical paths of the at least one polarization controller stage for mixing light in the two optical paths
Implementation Method 3
an input element for splitting the input beam into the orthogonal polarization components
Implementation Method 4
each of the at least one polarization controller stages and the optical mixer stage comprise a Mach-Zehnder Interferometer (MZI) structure with at least one phase shifter located in arms of the MZI structure
Implementation Method 5
at least one phase shifter located in arms of the MZI structure connected at a coupler
Data Source
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AI summary
Optical inputs to photonic switches may incorporate a polarization controller in order to change the polarization of the input signal to a pre-determined polarization for operation with the silicon photonics. A last stage of components of the polarization controller may overlap with a first input switching stage. A polarization controller that overlaps with the first stage of the switch input may provide lower insertion loss and power consumption for the photonic switch.