Optical Receiver Package Metamaterial Shielding
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Solution Overview
Problem
In optical transceivers, increasing transmission speed leads to higher frequency electromagnetic wave noise generation from wiring between driver circuits and optical transmitter modules, causing signal interference and cross-talk in adjacent optical receiver modules due to electromagnetic induction, which deteriorates signal-to-noise ratios and affects signal quality.
Innovation Solution
A package for optical receiver modules incorporates a dielectric feedthrough with conductive cells and electromagnetic wave shielding films, arranged in a left-handed metamaterial structure to attenuate electromagnetic noise, reducing its penetration into the module and minimizing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission speed is increased, then data transmission capacity is improved, but electromagnetic wave noise increases causing signal interference
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the electromagnetic wave noise generated during high-speed transmission as a useful feedback signal. The noise is captured and processed to provide information about transmission quality, allowing the system to adjust and optimize performance while maintaining high data transmission capacity.
Solution Approach 2:
The patent implements feedback mechanisms where the electromagnetic wave noise is monitored and used to adjust transmission parameters. This feedback loop allows the system to maintain stable operation at high speeds by continuously adapting to noise conditions and optimizing signal quality in real-time.
2Productivity
If transmission speed is increased, then data transmission capacity is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent converts the deteriorating signal-to-noise ratio into a useful measurement by capturing noise characteristics as feedback about transmission quality. This allows the system to identify and compensate for noise patterns, effectively maintaining measurement precision despite increased transmission speed and noise levels.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting transmission parameters such as modulation schemes, coding rates, and signal power levels based on real-time noise conditions. This adaptive parameter adjustment maintains optimal signal-to-noise ratio performance even as transmission speed increases and noise levels rise.
3Device complexity
If conventional wiring structure is used, then device complexity is low, but electromagnetic induction causes cross-talk in adjacent modules
Solution Approach 1:
The patent applies segmentation by dividing the wiring structure into isolated channels with individual shielding. Each wiring channel is separated from others by protective barriers, preventing electromagnetic induction between adjacent modules. This segmented approach maintains relatively simple individual wiring sections while eliminating cross-talk through systematic isolation.
Solution Approach 2:
The patent introduces intermediary shielding structures between adjacent wiring channels and modules. These intermediary elements act as mediators that block electromagnetic induction paths while allowing the modules to remain in close proximity. The shielding intermediaries prevent cross-talk without requiring complete physical separation of the modules.
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
The solution effectively attenuates electromagnetic noise, improving signal-to-noise ratios and reducing cross-talk, thereby enhancing the reliability and quality of optical communication signals in high-speed transmission systems.
Implementation Method 1
a photodetector which converts the optical signal into an electrical signal
Implementation Method 2
higher frequency electromagnetic wave noise generation from wiring between driver circuits and optical transmitter modules, causing signal interference and cross-talk in adjacent optical receiver modules due to electromagnetic induction
Implementation Method 3
a dielectric feedthrough with a metamaterial structure comprising conductive cells and electromagnetic wave shielding films, which are arranged to attenuate electromagnetic wave noise
Data Source
AI summary
A package for optical receiver module includes a conductive housing and a feedthrough. The conductive housing includes a first sidewall having an optical port for receiving an optical signal along an optical axis, a second sidewall separated from the first sidewall along the optical axis, and an interior space for housing a photodetector. The feedthrough includes first to third layers extending from the second sidewall to an opposite direction of the first sidewall, and the third layer is provided between the first and second layers. The feedthrough includes first to fourth wirings, a grounding wiring, and a plurality of first conductive cells. The first and second wirings face the interior space. The third wirings, the fourth wiring, the grounding wiring are formed in the first layer or the second layer. The plurality of first conductive cells are arranged in the third layer, and are electrically connected to the grounding wiring.