Planar Waveguide Solid Branch Reflectors for PLC Crosstalk Reduction
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Solution Overview
Problem
Existing planar lightwave circuits (PLCs) face challenges in efficiently detecting light from specific waveguides without increasing complexity and cost, and suffer from optical cross-talk and degradation due to numerous waveguide crossings when using multiple turning mirrors and detectors or tapping mechanisms.
Innovation Solution
A planar optical waveguide structure with a solid structure having branches with reflective surfaces, where waveguides optically end-couple to these surfaces, and an array of optical detectors is used to detect light, reducing the need for individual detectors and minimizing waveguide crossings by routing detected light to a single mirror and detector array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple turning mirrors and detectors are used to detect light from specific waveguides, then detection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple turning mirrors into a single solid structure with multiple branches, each branch having a reflective surface. This merging reduces the number of separate components while maintaining the ability to detect light from multiple waveguides simultaneously. The solid structure integrates multiple detection functions into one unified component, thereby reducing device complexity while preserving measurement precision.
Solution Approach 2:
The solid structure with multiple branches serves multiple functions: it acts as both a structural support and a light reflection system for multiple waveguides. Each branch can reflect light from different waveguides to corresponding detectors, making the single solid structure perform the work of multiple separate turning mirrors. This multi-functionality reduces the overall number of components needed in the system.
2Adaptability or versatility
If numerous waveguide crossings are used to route light to multiple detectors, then detection coverage is improved, but optical cross-talk and degradation increase
Solution Approach 1:
The solid structure is divided into multiple branches, each branch dedicated to reflecting light from a specific waveguide. This segmentation allows independent optimization of each light path and reduces interference between different waveguide signals. By dividing the reflection function across separate branches rather than using crossing waveguides, the system maintains detection coverage while minimizing optical cross-talk.
Solution Approach 2:
The reflective surfaces on the branches act as intermediaries that redirect light from waveguides to detectors without requiring the waveguides to cross each other. The branches serve as mediating structures that enable light transfer while maintaining spatial separation of different signal paths, thereby reducing optical cross-talk and degradation that would otherwise occur at waveguide crossings.
3Measurement precision
If individual detectors are used for each waveguide, then detection precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent merges multiple individual detector assignments into a single solid structure with multiple branches. Each branch is configured to reflect light from a specific waveguide to a corresponding detector, but the branching structure itself is formed as one integrated solid component rather than separate elements. This merging reduces the number of separate manufacturing steps and components while maintaining the precision of individual waveguide detection through dedicated branches.
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 configuration simplifies manufacturing, reduces optical cross-talk, and enhances the performance of PLCs by allowing efficient light detection with fewer waveguide intersections, thereby improving the overall efficiency and cost-effectiveness of the device.
Implementation Method 1
a slope of the reflective surface area is at an angle configured to reflect the light propagating in said first direction to a second direction
Implementation Method 2
each of the two planar optical waveguides being configured to optically end-couple to the reflective surface area of a corresponding one of the branches
Data Source
AI summary
An apparatus is disclosed comprising a planar optical waveguide structure which includes a substrate and two planar optical waveguides thereon. The apparatus further comprises a solid structure having a body and two branches connected to the body. Each of the two branches has a reflective surface area thereon. Each of the two planar optical waveguides is configured to optically couple light from an end thereof to the reflective surface area of a corresponding one of the branches. The planar optical waveguide structure further includes a third planar optical waveguide on the substrate. The third planar optical waveguide has a segment located between the solid structure and the substrate.