Optical Waveguide Device for Slot-to-Rectangular Conversion
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Solution Overview
Problem
Conventional converters for converting waveguide structures between rectangular and slot waveguides often suffer from high-order mode component propagation, leading to increased optical loss and decreased communication quality due to interference between basic and high-order mode components.
Innovation Solution
The optical waveguide device incorporates a tapered portion and a separation portion with specifically designed core dimensions and spacings to guide light from a slot waveguide to a rectangular waveguide, ensuring adiabatic conversion and minimizing high-order mode component propagation by maintaining a large spacing between waveguides, thereby reducing optical loss and enhancing communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional converter is used to convert between rectangular and slot waveguides, then waveguide structure conversion is achieved, but high-order mode component propagation occurs leading to increased optical loss
Solution Approach 1:
The converter is divided into three distinct sections: a first waveguide section (slot waveguide), a second waveguide section (rectangular waveguide), and a coupling section connecting them. This segmentation allows each section to be optimized for its specific function, with the coupling section specifically designed to manage mode conversion and suppress high-order mode propagation, thereby reducing optical loss while maintaining communication quality.
Solution Approach 2:
The coupling section features non-uniform core widths that vary along the propagation direction, with the first core width differing from the second core width. This local variation in geometric properties enables precise control over mode conversion characteristics, allowing the structure to suppress high-order mode components while facilitating efficient fundamental mode conversion between the slot and rectangular waveguide configurations.
2Reliability
If a conventional converter is used to convert between rectangular and slot waveguides, then waveguide structure conversion is achieved, but interference between basic and high-order mode components decreases communication quality
Solution Approach 1:
By segmenting the converter into distinct sections with different waveguide configurations and a specialized coupling section, the design isolates the mode conversion process from the propagation paths. This segmentation prevents high-order mode components generated during conversion from propagating into the output waveguide, thereby eliminating interference with the fundamental mode and maintaining communication quality.
Solution Approach 2:
The coupling section employs localized geometric variations with non-uniform core widths that are specifically engineered to control mode conversion. This local quality variation creates a gradient that favors fundamental mode conversion while suppressing high-order mode generation, thus preventing mode component interference in the output signal.
3Volume of moving object
If slot waveguide is used for optical wire with small bend radius, then miniaturization is achieved, but large optical loss occurs
Solution Approach 1:
The rectangular waveguide section acts as an intermediary between the slot waveguide and the output, enabling the system to achieve miniaturization through the slot waveguide's small bend radius capability while the rectangular waveguide section ensures low optical loss propagation. The coupling section mediates the transition between these two configurations, allowing the system to combine the size advantages of slot waveguides with the low-loss characteristics of rectangular waveguides.
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 effectively suppresses high-order mode component propagation, achieving low optical loss and improved communication quality by ensuring adiabatic conversion of basic mode components with minimal interference, particularly effective in wide bandwidth optical communication systems.
Implementation Method 1
ensuring adiabatic conversion and minimizing high-order mode component propagation
Implementation Method 2
optical electric fields are concentrated in the core in a rectangular waveguide. Thus, forming an optical wire using a rectangular waveguide will minimize optical loss that could occur due to leakage of light to the outside of the core
Data Source
AI summary
An optical waveguide device that is implemented between a slot waveguide and a rectangular waveguide includes: a tapered portion and a separation portion. The tapered portion includes first and second cores that are respectively coupled to cores of the slot waveguide and formed in parallel each other. The separation portion includes third and fourth cores that are respectively coupled to the first and second cores. Cross-sectional areas of the first and second cores are substantially equal each other at an input end. The cross-sectional area of the first core is larger than that of the second core at an output end. A shape of a cross section of the first core changes continuously between the input end and the output end in the tapered portion. A spacing between the third core and the fourth core is continuously extended in the separation portion.