PIC Waveguide Structure With Integrated Stray Light Absorption
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Solution Overview
Problem
Unguided light in photonic integrated circuits (PICs) can act as a source of noise for other components, leading to undesirable detection and influence on light amplification.
Innovation Solution
A waveguide structure with a light absorption portion is integrated to absorb light not confined by the primary waveguide, using a diode junction with aligned contacts for light emission and absorption, and recesses filled with dielectric material to enhance light confinement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a waveguide structure is used to guide light between components, then light transmission is enabled, but unguided light is generated that acts as noise for other components
Solution Approach 1:
The patent converts the harmful unguided light into a beneficial effect by introducing a light absorption portion that selectively absorbs unguided light while allowing guided light to pass through. The absorption portion transforms the harmful noise into absorbed energy, preventing it from interfering with other components.
Solution Approach 2:
The waveguide structure is segmented into distinct functional portions: a light guiding portion for transmitting guided light and a light absorption portion for absorbing unguided light. This segmentation allows each portion to perform its specific function optimally, with the absorption portion positioned to intercept only the harmful unguided light.
2Object-generated harmful factors
If light absorption portion is added to absorb unguided light, then noise is reduced, but device complexity increases
Solution Approach 1:
The light absorption portion is merged with the waveguide structure to form an integrated component. The absorption portion is positioned adjacent to or integrated with the guiding portion, allowing both functions to coexist in a compact structure without requiring separate noise filtration systems.
Solution Approach 2:
The absorption portion is strategically positioned only where unguided light is generated or where it would interfere with other components. This localized approach ensures that absorption functionality is provided precisely where needed, rather than throughout the entire waveguide structure, minimizing added complexity.
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 noise by effectively absorbing unguided light, improving the operational performance and reducing interference with other components in the PIC.
Implementation Method 1
a light absorption portion to absorb light emitted from the light emission portion in the second direction
Implementation Method 2
Waveguide structures for a photonic integrated circuit (PIC) make use of waveguide structures to guide light between components of the PIC
Data Source
AI summary
A waveguide structure (100) for a photonic integrated circuit, comprising: a substrate; an active region (102) comprising a diode junction, the active region comprising: a light emission portion (102a) to emit light in a first direction and a second direction perpendicular the first direction; and a light absorption portion (102b) to absorb light emitted from the light emission portion (102a) in the second direction; a first contact corresponding to the light emission portion (102a); and a second contact corresponding to the light absorption portion (102b).