Variable Wavelength Division Multiplexing Filter

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Solution Overview

Problem

Current wavelength division multiplexing filters face inefficiencies due to fixed frequency slots, leading to wasted bandwidth and inability to accommodate signals with varying spectral widths, as they require frequent system changes and are economically uneconomical.

Innovation Solution

A wavelength division multiplexing filter with a variable shape, offering a resolution twice that of standard filters, with frequency slot center frequencies offset by half a cycle relative to standard wavelength grids, allowing flexible allocation of bandwidth for signals with different spectral widths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If fixed frequency slots are used in wavelength division multiplexing filters, then standardization and ease of manufacture are improved, but bandwidth utilization efficiency deteriorates due to wasted bandwidth and inability to accommodate signals with varying spectral widths

Engineering Contradiction:
Improveease of manufactureVSAvoidbandwidth utilization efficiency
Core Design Contradiction:
Ease of manufactureVSProductivity

Solution Approach 1:

The patent applies the dynamics principle by transitioning from fixed frequency slots to variable frequency slots. The filter configuration can be dynamically adjusted to match the actual spectral width requirements of different signals, allowing the system to adapt between narrowband and broadband modes. This dynamic reconfiguration enables efficient bandwidth utilization while maintaining standardization benefits through controlled variable changes.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying the frequency slot width parameter based on signal requirements. The system can change the frequency slot parameter from fixed values to variable values that match the spectral width of incoming signals. This parameter adjustment allows optimal bandwidth allocation, preventing wasted bandwidth while maintaining compatibility with standard wavelength grids through careful parameter selection.

Inventive Principle:
Principle #35Parameter changes

2Device complexity

If fixed frequency slots are used, then device complexity is reduced, but adaptability to signals with varying spectral widths deteriorates

Engineering Contradiction:
Improvedevice complexityVSAvoidadaptability
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by enabling the frequency slot configuration to change dynamically based on signal characteristics. The system can switch between different frequency slot widths to accommodate signals with varying spectral widths, providing adaptability while maintaining relatively simple device architecture through controlled dynamic adjustment mechanisms.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent implements universality by designing a single filter system that can handle multiple signal types with different spectral widths. The variable frequency slot capability allows the same device to serve multiple functions: accommodating narrowband signals, broadband signals, and signals with varying spectral characteristics, thereby achieving versatility without requiring multiple specialized devices.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Ease of manufacture

If standard wavelength grids are used, then manufacturing standardization is improved, but bandwidth allocation efficiency deteriorates due to fixed frequency slot boundaries

Engineering Contradiction:
Improvemanufacturing standardizationVSAvoidavailable bandwidth
Core Design Contradiction:
Ease of manufactureVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by adjusting the frequency slot width parameter while maintaining alignment with standard wavelength grids. The system can variable the frequency slot parameter to match signal spectral widths, ensuring optimal bandwidth allocation. This parameter flexibility allows efficient use of available bandwidth without compromising manufacturing standardization, as the variable parameters are applied in conjunction with standardized grid references.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS8095011B2Wavelength division multiplexing filter, wavelength division multiplexing system, and wavelength division multiplexing method
Publication Date: 2012.01.10 NEC CORP
  • US8095011B2 patent drawing
  • US8095011B2 patent drawing
  • US8095011B2 patent drawing

AI summary

A wavelength division multiplexing filter according to the present invention is a wavelength division multiplexing filter having a variable filter shape. The wavelength division multiplexing filter has a resolution equal to 2N times (N being an integer, where N≧1) a reference frequency interval and has frequency arrangement of center frequencies of frequency slots corresponding to the 2N-times resolution be offset by half a cycle with respect to the frequency arrangement of standard wavelength grids having a frequency interval equal to ½N of the reference frequency interval.