Faraday Rotator Through-Via Patch Interconnect for Reflection Filtering
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Solution Overview
Problem
Direct optical coupling between an optical cable and a photonics die results in low signal-to-noise ratios due to reflected light, leading to optical interference and inaccurate signal propagation.
Innovation Solution
Integration of a Faraday rotator within the photonics package architecture, utilizing a polarizer, magnetic region, and another polarizer to modify light polarization, thereby filtering out reflections and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct optical coupling is used between optical cable and photonics die, then device complexity is reduced, but signal-to-noise ratio deteriorates due to reflected light and optical interference
Solution Approach 1:
A Faraday rotator is introduced as an intermediary component between the optical cable and photonics die. This rotator modifies the polarization state of light passing through it, enabling the separation of forward-propagating signals from reflected noise. The intermediary device resolves the contradiction by adding functional complexity that eliminates optical interference, thereby improving signal-to-noise ratio without significantly increasing overall device complexity.
Solution Approach 2:
The invention changes the polarization parameter of light using a Faraday rotator. By rotating the polarization angle of transmitted light while leaving reflected light unchanged, the system creates a parameter difference that enables noise filtering. This parameter transformation resolves the technical contradiction by maintaining simple direct coupling geometry while improving signal quality through polarization state modification.
2Reliability
If a Faraday rotator is integrated into the photonics package, then signal-to-noise ratio is improved by filtering reflected light, but device complexity increases
Solution Approach 1:
The Faraday rotator is nested within the existing photonics package structure, integrating the noise-filtering function into the established architecture. Rather than creating a separate system, the rotator is incorporated as part of the coupling mechanism, allowing the benefit of improved signal-to-noise ratio to be achieved with minimal increase in overall device complexity.
3Ease of manufacture
If direct light coupling architecture is used, then ease of manufacture is improved, but optical interference increases leading to inaccurate signal propagation
Solution Approach 1:
The Faraday rotator serves as a mediator that preserves the simplicity of direct coupling manufacturing while eliminating optical interference. The component can be integrated using standard packaging techniques, maintaining ease of manufacture, while simultaneously ensuring accurate signal propagation by filtering reflected light through polarization rotation.
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
Enhances signal-to-noise ratio and improves performance of optical interconnects by reducing optical interference.
Implementation Method 1
a Faraday rotator between an optical cable and the photonics die
Implementation Method 2
utilizing a polarizer, magnetic region, and another polarizer to modify light polarization
Data Source
AI summary
Embodiments disclosed herein include optical systems with Faraday rotators in order to enhance efficiency. In an embodiment, a photonics package comprises an interposer and a patch over the interposer. In an embodiment, the patch overhangs an edge of the interposer. In an embodiment, the photonics package further comprises a photonics die on the patch and a Faraday rotator passing through a thickness of the patch. In an embodiment, the Faraday rotator is below the photonics die.