Stacked Optical Waveguide Layout for Low-Crosstalk Signal Routing
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Solution Overview
Problem
Optical waveguide structures with co-layer cross optical waveguides experience significant insertion loss due to crosstalk from waveguide crossings, limiting integration and miniaturization.
Innovation Solution
Implementing a stacked optical waveguide structure with physically connected optical waveguides at different layers, utilizing a first optical waveguide channel for total reflection to reduce crossings and crosstalk, and incorporating dielectric layers with controlled refractive indices to enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If co-layer cross optical waveguides are used to implement optical signal transmission between different optical waveguides, then integration of the optical waveguide structure is improved, but crosstalk between optical waveguides is introduced resulting in large insertion loss
Solution Approach 1:
The patent transitions from a two-dimensional co-layer cross optical waveguide structure to a three-dimensional stacked structure. Optical waveguides are arranged in multiple layers stacked vertically, with optical waveguide channels connecting waveguides across different layers. This dimensional change eliminates the need for crossing waveguides within the same layer, thereby reducing crosstalk and insertion loss while maintaining integration.
Solution Approach 2:
The optical waveguide structure is segmented into multiple independent layers, each containing optical waveguides that do not cross other waveguides in the same layer. Optical coupling is achieved through dedicated channels between layers rather than through-space coupling at crossing points. This segmentation isolates optical paths and eliminates crosstalk between adjacent waveguides.
2Volume of moving object
If optical waveguides are arranged in a stacked manner at different layers, then miniaturization of the optical waveguide structure is implemented, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates alignment marks and positioning structures during the fabrication process to pre-establish precise relative positions between layers. Optical waveguide channels are formed with predetermined geometries and positions that facilitate automatic alignment. These preliminary actions ensure that subsequent stacking and coupling operations achieve the required precision without requiring ultra-precise manual alignment.
Solution Approach 2:
The patent introduces intermediate coupling structures and alignment reference features that mediate between different layers. These intermediaries provide physical and optical references that simplify the alignment process, allowing standard manufacturing tolerances to achieve the required coupling precision. The intermediaries act as buffers that absorb minor misalignments while maintaining optical coupling efficiency.
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
Reduces transmission insertion loss, improves signal quality, and enables effective integration and miniaturization of optical waveguide structures.
Implementation Method 1
The first optical waveguide channel implements optical signal transmission between the first optical waveguide and the second optical waveguide through total reflection
Data Source
AI summary
An optical waveguide structure and a manufacturing method, an optical waveguide module, an optical switching device, and an optical waveguide system are provided, and belong to the field of optical communication. The optical waveguide structure includes: at least two optical waveguides disposed in a stacked manner, where a first optical waveguide channel is disposed between two optical waveguides located at different layers in the at least two optical waveguides, and two ends of the first optical waveguide channel are physically connected to the two optical waveguides.