Integrated Polarization Controller for Low-Loss Photonic Systems
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Solution Overview
Problem
Photonics systems face challenges in efficiently controlling and converting polarization states of light due to the use of bulky free-space optics, which introduce unwanted insertion loss and complexity in on-chip applications.
Innovation Solution
An integrated photonics system with a polarization controller that includes a polarization splitter rotator, phase shifters, and splitters, optimized to convert any polarization state with orthogonal components into a single component direction, using on-chip devices to minimize loss and enhance control through feedback loops and tunable phase shifters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free-space optics are used to control polarization states, then polarization conversion capability is achieved, but device size and insertion loss increase
Solution Approach 1:
The patent merges multiple polarization control functions (polarization splitter, rotator, phase shifter) into a single integrated photonic chip structure. The polarization splitter rotator combines splitting and rotation functions, while phase shifters are integrated along waveguides, eliminating the need for separate free-space optical components and reducing overall device volume.
Solution Approach 2:
The patent replaces mechanical free-space optical components with integrated photonic waveguide-based systems. Instead of using bulkier mechanical optical elements for polarization control, the invention uses photonic integrated circuitry with waveguides and on-chip components, substituting mechanical optics with integrated photonic mechanisms.
2Adaptability or versatility
If free-space optics are used for polarization control, then polarization manipulation is achieved, but insertion loss increases
Solution Approach 1:
By combining multiple polarization control functions into a single integrated chip with waveguide-based components, the patent reduces the number of optical interfaces and connections between components. This integration minimizes reflection losses and absorption losses that occur at multiple component interfaces in free-space optical systems.
Solution Approach 2:
The patent substitutes free-space optical components with integrated photonic waveguide components that have lower insertion losses. The waveguide-based phase shifters and splitters are designed to minimize optical loss through optimized waveguide structures and reduced number of discrete connections.
3Volume of moving object
If integrated photonics are used to control polarization states, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates tunable phase shifters that can be dynamically adjusted after fabrication. This tunability allows compensation for manufacturing variations and tolerances, reducing the stringency of manufacturing precision requirements while maintaining the compact integrated form factor.
Solution Approach 2:
The patent implements feedback control mechanisms where tunable phase shifters can be adjusted based on measured polarization states. This feedback capability allows the system to compensate for fabrication tolerances and achieve desired polarization control performance even with moderate manufacturing precision.
4Adaptability or versatility
If multiple polarization control components are integrated, then polarization control versatility is improved, but device complexity increases
Solution Approach 1:
The patent merges the polarization splitter and rotator into a single polarization splitter rotator component, reducing the total number of discrete components. It also integrates phase shifters directly along the waveguides rather than using separate components, thereby reducing device complexity while maintaining polarization control versatility.
Solution Approach 2:
The integrated photonic chip design allows the same waveguide structure to serve multiple functions: polarization splitting, rotation, and phase shifting. The tunable phase shifters can be configured to perform different polarization control operations, making the system multi-functional and reducing the need for separate dedicated components.
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 solution enables efficient conversion and control of polarization states on-chip, reducing insertion loss and complexity, and allowing for operation with various polarization states, including circular and elliptical polarizations, while maintaining optimal output power and signal quality.
Implementation Method 1
a polarization splitter rotator (PSR) including a first, a second, and a third port, the PSR coupled via its first port, over the polarization-side port
Implementation Method 2
a first phase shifter coupled along a first waveguide of the first set of waveguides; the first phase shifter is configured for imparting a phase shift which optimizes optical signals emerging from at least one port of the at least one component-side port of the polarization controller
Implementation Method 3
a first splitter including a first set of ports and a second set of ports, the first splitter coupled to the PSR via its first set of ports and over the first set of waveguides, and coupled over at least one port of its second set of ports, via the at least one component-side port of the polarization controller
Data Source
AI summary
Disclosed are integrated photonics systems including polarization controllers for photonics systems which incorporate integrated photonics for implementing polarization effects in optical signals. Integrated photonic components separate, control, and combine the polarization components of optical signals, using a polarization splitter combiner, at least one phase shifter and a least one splitter.