Graphene Optical Noise Suppressor for Laser Signal Integrity
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Solution Overview
Problem
Optical devices operating at ultrahigh speeds face challenges in noise suppression, particularly with lasers, as existing materials like oxide crystals and semiconductor devices are bulky and prone to errors due to noise, requiring additional power for signal amplification to reduce error probability.
Innovation Solution
An optical device incorporating a graphene layer that interacts with the laser, absorbing spectral components with energy below a threshold and allowing higher energy components to pass through, thereby reducing noise and distinguishing between signal and noise levels without the need for additional amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional power is used to amplify the laser signal, then the probability of error is reduced, but the energy consumption increases
Solution Approach 1:
The patent extracts and removes the harmful noise components from the laser signal using a graphene-based optical filter. The filter selectively transmits the desired laser wavelength while blocking noise spectral components, thereby reducing error probability without requiring additional amplification power.
Solution Approach 2:
The patent converts the noise suppression function into a beneficial outcome by using the graphene material's inherent optical properties. The graphene layer naturally absorbs noise wavelengths while transmitting the signal wavelength, transforming what would be a harmful interference into a selective filtering mechanism that improves signal quality without energy expenditure for active noise cancellation.
2Reliability
If oxide crystals and semiconductor devices are used for laser modulation, then optical signal processing is effective, but the device volume becomes large
Solution Approach 1:
The patent changes the material parameter from traditional bulk materials (oxide crystals, semiconductors) to a two-dimensional nanomaterial (graphene). This dimensional reduction enables the same optical modulation function to be achieved with dramatically reduced device volume while maintaining or improving performance.
Solution Approach 2:
The patent employs graphene as a composite material integrated into the optical device structure. The graphene layer is combined with conventional optical components to create a hybrid system that achieves effective optical signal processing in a miniaturized form factor.
3Reliability
If the graphene layer interacts with the laser to suppress noise, then noise is reduced, but the graphene may be damaged
Solution Approach 1:
The patent applies the graphene layer in a specific localized region where it can interact with the laser field to suppress noise. By positioning the graphene at the optimal location within the optical cavity or waveguide, the interaction is confined to where it is most effective, minimizing overall energy exposure and potential damage while maintaining noise suppression performance.
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 approach enhances the quality of continuous wave laser oscillation, reduces error probability in digital optical signals, and minimizes graphene damage, achieving high accuracy with low power consumption and extended durability.
Implementation Method 1
The graphene has a saturable absorption property that absorbs light of low intensity and allows light of high intensity to pass through
Data Source
AI summary
Embodiments relate to a noise suppressor for suppressing noise of an optical signal, including a core through which the optical signal travels, a clad that is wrapped around the core and configured to expose part of the core, and a graphene layer formed on the part of the core, and a digital optical signal generation system including the same.