Optical Transmitter Crosstalk Suppression via Spectral Filtering
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Solution Overview
Problem
The use of optical frequency comb light sources in WDM systems leads to crosstalk due to high-order spectral components, which can exceed the specifications defined by standards like OIF 400ZR, and also results in signal deterioration.
Innovation Solution
An optical transmitter configuration that includes a frequency comb light source, a demultiplexer to split the light into multiple channels, and a series of filters connected to each output port of the demultiplexer to reduce high-order spectral components, thereby suppressing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an optical frequency comb light source is used in WDM systems, then a large number of channels can be densely arranged at narrow wavelength intervals, but high-order spectral components cause crosstalk that exceeds specification limits
Solution Approach 1:
The patent extracts and removes the harmful high-order spectral components from the optical frequency comb light source using a spectral filter. The filter is configured to pass only the fundamental spectral components while blocking the high-order components, thereby eliminating the source of crosstalk while maintaining the desired channel density
Solution Approach 2:
The patent introduces a spectral filter as an intermediary component between the optical frequency comb light source and the WDM system. This mediator selectively transmits desired wavelengths while blocking harmful high-order spectral components, resolving the crosstalk issue without sacrificing channel capacity
2Adaptability or versatility
If an optical frequency comb light source is used, then multi-wavelength output is achieved, but signal deterioration occurs due to high-order spectral components
Solution Approach 1:
The patent extracts only the useful fundamental spectral components from the optical frequency comb while removing the harmful high-order components. This selective extraction maintains the multi-wavelength capability needed for WDM while eliminating signal deterioration caused by high-order spectral interference
3Stability of the object's composition
If high-order spectral components are present, then the optical frequency comb structure is maintained, but crosstalk exceeds OIF 400ZR specification limits
Solution Approach 1:
The patent selectively removes high-order spectral components from the frequency comb structure while preserving the fundamental comb modes. The spectral filter is designed to pass the primary frequency components that maintain the comb structure while blocking higher-order components that cause crosstalk exceeding specification limits
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 proposed configuration effectively suppresses crosstalk by reducing high-order spectral components, ensuring compliance with standards like OIF 400ZR and improving signal quality.
Implementation Method 1
a demultiplexer configured to demultiplex light output from the frequency comb light source into n channels (n is an integer of 2 or greater) at a wavelength interval Δλ
Implementation Method 2
n filters respectively connected to n output ports of the demultiplexer, the n filters being configured to reduce a high-order spectral component for each wavelength
Data Source
AI summary
An optical transmitter includes a frequency comb light source; a demultiplexer configured to demultiplex light output from the frequency comb light source into n channels (n is an integer of 2 or greater) at a wavelength interval Δλ; and n filters respectively connected to n output ports of the demultiplexer, the n filters being configured to reduce a high-order spectral component for each wavelength.