Arrayed Waveguide Grating With Integrated Optical Filter
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Solution Overview
Problem
Conventional wavelength distributors for optical communications systems are bulky and costly due to the need for multiple components and optical filters, making them unsuitable for miniaturization and efficient wavelength distribution of signals with different wavelength intervals over a single fiber.
Innovation Solution
An arrayed waveguide grating with two or more channel waveguide groups and an optical filter integrated into the slab waveguides, allowing for wavelength distribution of different wavelength bands with varying intervals in a single planar lightwave circuit, reducing the footprint and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple components and optical filters are used for wavelength distribution, then wavelength distribution capability is improved, but device size and cost increase
Solution Approach 1:
The patent merges multiple optical filters with different wavelength intervals into a single integrated arrayed waveguide grating structure. The channel waveguide group with varying path lengths combines the functions of multiple discrete optical filters, enabling wavelength distribution for multiple bands (1.3 μm and 1.5 μm) within one compact device, thereby reducing device size and complexity while maintaining versatile wavelength distribution capability
Solution Approach 2:
The arrayed waveguide grating is designed to perform multiple functions simultaneously: it distributes wavelengths from both the 1.3 μm broad interval band and the 1.5 μm narrow interval band, and can operate in both multiplexing and demultiplexing modes. This multi-functionality eliminates the need for separate dedicated devices for each wavelength band, reducing overall device complexity
2Adaptability or versatility
If multiple components and optical filters are used for wavelength distribution, then wavelength distribution capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple optical filters with different wavelength intervals into a single integrated arrayed waveguide grating structure. The channel waveguide group with varying path lengths combines the functions of multiple discrete optical filters, enabling wavelength distribution for multiple bands (1.3 μm and 1.5 μm) within one compact device, thereby reducing device size and complexity while maintaining versatile wavelength distribution capability
Solution Approach 2:
The patent uses a standardized arrayed waveguide grating structure that can be manufactured using conventional optical waveguide fabrication processes. By copying the successful design of conventional AWGs and adapting it to handle multiple wavelength bands through a single channel waveguide group, the invention achieves cost-effective manufacturing while maintaining enhanced wavelength distribution capability
3Adaptability or versatility
If conventional arrayed waveguide grating is used, then wavelength distribution is achieved, but it cannot handle different wavelength intervals simultaneously
Solution Approach 1:
The patent introduces a dynamic wavelength distribution capability by designing a single channel waveguide group that can handle multiple wavelength intervals (both broad 1.3 μm and narrow 1.5 μm) through its varying path lengths. The structure dynamically adapts to different input wavelengths and routing configurations, allowing flexible wavelength distribution without requiring separate static structures for each wavelength band
Solution Approach 2:
The patent segments the wavelength distribution function into distinct path length segments within the channel waveguide group. Each segment corresponds to a specific path length difference that is optimized for particular wavelength intervals. This segmentation allows the single channel waveguide group to independently handle different wavelength bands while maintaining an otherwise simple integrated structure
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
Enables miniaturized and cost-effective wavelength distribution of wavelength-multiplexed signal lights with different wavelength intervals over a single fiber, enhancing the efficiency and compactness of optical communications systems.
Implementation Method 1
an arrayed waveguide grating including: a first slab waveguide formed on a substrate; a second slab waveguide formed on the substrate; a first input/output waveguide connected to the first slab waveguide; a second input/output waveguide connected to the second slab waveguide; two or more channel waveguide groups connecting the first and second slab waveguides, each of the channel waveguide groups formed of an aggregate of a plurality of channel waveguides having path lengths sequentially becoming longer by a predetermined path length difference
Implementation Method 2
an optical filter arranged in at least one of the first and second slab waveguides
Data Source
AI summary
An arrayed waveguide grating provided with a first slab waveguide formed on a substrate; a second slab waveguide formed on the substrate; a first input/output waveguide connected to the first slab waveguide; a second input/output waveguide connected to the second slab waveguide; two or more channel waveguide groups connecting the first and second slab waveguides, each of the channel waveguide groups formed of an aggregate of a plurality of channel waveguides having path lengths sequentially becoming longer by a predetermined path length difference; and an optical filter arranged in at least one of the first and second slab waveguides.