Integrated Polarization Splitter and Rotator Waveguide
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Solution Overview
Problem
Current photonic integrated circuits (PICs) require separate devices for polarization splitting and rotation, increasing cost and manufacturing complexity due to their polarization-dependent behavior and the need for separate components to handle TE0 and TM0 modes.
Innovation Solution
An integrated polarization splitter and rotator design featuring orthogonally polarized transverse electric (TE) and transverse magnetic (TM) modes in waveguides with a reverse taper-shaped side, breaking vertical and horizontal symmetry to achieve polarization rotation and splitting, allowing for identical design of circuits processing both input polarizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate devices are used for polarization splitting and rotation, then each function can be performed independently, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines polarization splitting and rotation functions into a single integrated waveguide device. The first waveguide performs polarization splitting by separating TE0 and TM0 modes into different output waveguides, while the second waveguide performs polarization rotation by converting between TE0 and TM0 modes. This merging eliminates the need for separate devices, reducing device complexity and manufacturing cost while maintaining functional reliability.
Solution Approach 2:
The integrated waveguide device performs multiple polarization-related functions simultaneously. The first waveguide provides both polarization splitting and the ability to route both polarizations to different outputs, while the second waveguide provides polarization rotation capability. This multi-functionality allows a single device to replace what would traditionally require multiple separate components.
2Manufacturing precision
If separate devices are used for polarization splitting and rotation, then each component can be optimized independently, but manufacturing complexity and cost increase
Solution Approach 1:
By merging polarization splitting and rotation into a single integrated waveguide structure, the patent enables both functions to be fabricated using the same photonic integration process. The waveguides are formed in a common substrate with controlled coupling regions, allowing simultaneous optimization of both functions during a single manufacturing process rather than requiring separate fabrication steps for multiple devices.
3Adaptability or versatility
If polarization-dependent behavior is accommodated with separate components, then each polarization mode can be handled independently, but the overall system complexity increases
Solution Approach 1:
The integrated device provides universal polarization handling capability. The first waveguide can route both TE0 and TM0 modes to different outputs, and the second waveguide can convert between these polarization modes. This allows the same device structure to handle all polarization states, providing adaptability for different polarization inputs while maintaining a simple unified system architecture.
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 solution enables efficient polarization splitting and rotation within a single device, reducing manufacturing complexity and cost by integrating polarization splitting and rotation functions, while maintaining the order of polarization modes along an adiabatic taper structure.
Implementation Method 1
a second waveguide disposed below the first waveguide and comprising a reverse taper-shaped side to adiabatically receive one of the polarization modes (e.g., the TE mode) of the received light from the first waveguide
Implementation Method 2
the TM mode of the received light is rotated to a TE mode in the first waveguide
Data Source
AI summary
Embodiments of the invention describe photonic integrated circuits (PICs) for accomplishing polarization splitting and rotation. Embodiments of the invention include a first waveguide to receive light comprising orthogonally polarized transverse electric (TE) and transverse magnetic (TM) modes, and a second waveguide disposed below the first waveguide and comprising a reverse taper-shaped side to adiabatically receive one of the polarization modes (e.g., the TE mode) of the received light from the first waveguide. Said horizontal offset between the first and the reverse taper-shaped side of the second waveguide comprises an offset such that, for example, the TM mode of the received light is rotated to a TE mode in the first waveguide. The above described offsets and taper shaped structures may also be used in an optical combiner.