Underwater Optical Link Noise Suppression for Blue-Green Crosstalk

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Solution Overview

Problem

Existing underwater optical wireless communication systems experience a decrease in communication accuracy due to green light noise generated by blue light emission, which interferes with green light reception, leading to reduced signal-to-noise ratio.

Innovation Solution

The system incorporates a noise suppression unit with a green light noise removal unit and generation suppression unit, including a green light noise signal removal circuit and filters, to mitigate green light noise caused by blue light emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If blue light is emitted for communication, then blue signal transmission is achieved, but green light noise is generated that interferes with green light reception

Engineering Contradiction:

Improveblue light emissionVSAvoidgreen light noise

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the harmful green light noise component from the received light signal using a noise removal filter. The filter selectively transmits the green communication signal while blocking the green noise light generated by blue light emission, thereby separating the useful signal from the harmful noise.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a noise removal filter as an intermediary component between the light receiver and the signal processing unit. This filter acts as a mediator that selectively allows the green communication signal to pass while blocking the green noise, enabling clean signal reception despite the presence of noise-generating blue light emission.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If bidirectional optical wireless communication is performed using blue and green light, then communication capability is achieved, but green light noise reduces communication accuracy

Engineering Contradiction:

Improvebidirectional communication capabilityVSAvoidcommunication accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent extracts the green noise light component from the received light using a noise removal filter with specific wavelength characteristics. This allows the system to maintain bidirectional communication while extracting and eliminating the noise that would otherwise degrade communication accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies local quality by making the optical path selective - the noise removal filter is positioned in the green light reception path to specifically address the green noise problem, while the blue light emission path remains unaffected. This targeted approach maintains communication accuracy without compromising bidirectional capability.

Inventive Principle:

Principle #3Local quality

3Device complexity

If green light noise is not suppressed, then system complexity is low, but signal-to-noise ratio decreases

Engineering Contradiction:

Improvesystem complexityVSAvoidsignal-to-noise ratio

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces a noise removal filter as an intermediary component in the green light reception path. This single filter addition provides effective noise suppression with minimal increase in system complexity, maintaining a favorable balance between system simplicity and signal-to-noise ratio.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 suppresses green light noise, maintaining a stable signal-to-noise ratio and enhancing communication accuracy in underwater optical wireless communication systems.

Implementation Method 1

a light emitter configured to emit first light having a first wavelength included in a blue wavelength band as a center wavelength

Methodology Applied

Scientific EffectLight emission: Light

Implementation Method 2

a light receiver configured to receive second light in which a second wavelength included in a green wavelength band is a center wavelength

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 3

a noise suppression unit configured to suppress noise caused by green light generated due to the first light

Methodology Applied

Scientific EffectOptical absorption: Absorption (EM radiation)

Data Source

PatentUS12598004B2Underwater optical wireless communication device and underwater optical wireless communication system

Publication Date: 2026.04.07 SHIMADZU CORP

AI summary

An underwater optical wireless communication device (first communication device) is an underwater optical wireless communication device for underwater optical wireless communication. It includes a first light emitter for emitting first light having a first wavelength included in a blue wavelength band as a center wavelength, a first light receiver for receiving second light having a second wavelength included in a green wavelength band as a center wavelength, and a noise suppression unit for suppressing noise caused by green light generated due to the first light.