Variable Equalizer for WDM Optical Signal Spectrum Flattening
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Solution Overview
Problem
The existing technologies require multiple equalizers to be prepared according to different use conditions of amplifiers, leading to increased costs due to the need for various configurations.
Innovation Solution
A variable equalizer system that includes an analysis unit to analyze the spectrum of an amplified wavelength-division multiplexed optical signal, a control unit to calculate a loss profile for each wavelength to flatten the signal spectrum, and a Wavelength Selective Switch (WSS) to apply the loss profile, allowing for adaptive equalization without pre-setting loss profiles for different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple equalizers are prepared according to different amplifier use conditions, then the equalization accuracy for each condition is improved, but the device complexity and cost increase
Solution Approach 1:
The patent implements a single equalizer that can function for multiple amplifier use conditions by dynamically changing its loss profile. The control unit calculates different loss profiles based on detected amplifier conditions (temperature, input power) and configures the equalizer accordingly, allowing one device to replace multiple dedicated equalizers while maintaining equalization accuracy for each condition
Solution Approach 2:
The equalizer transitions from a static configuration to a dynamic one where the loss profile can be changed in real-time. The control unit continuously monitors amplifier conditions and adjusts the equalizer's loss profile dynamically, enabling the system to adapt to different operating conditions without requiring multiple fixed equalizers
2Adaptability or versatility
If multiple equalizers are prepared for different amplifier conditions, then the adaptability to various conditions is improved, but the cost increases
Solution Approach 1:
A single equalizer is designed to handle multiple amplifier use conditions through dynamic loss profile configuration. The control unit stores multiple loss profiles and selects/apples the appropriate one based on detected amplifier conditions, achieving the adaptability of multiple equalizers while reducing the quantity of equipment needed and associated costs
Solution Approach 2:
The equalizer's loss profile parameters are changed dynamically based on amplifier conditions such as temperature and input power. By adjusting these parameters rather than using different physical equalizers, the system achieves adaptability while reducing equipment quantity and cost
Data Source
AI summary
A variable equalizer, a repeater, and an equalizing method capable of reducing a cost incurred due to a plurality of equalizers which would otherwise need to be prepared according to the use conditions of the amplifier are provided. A variable equalizer includes an analysis unit configured to analyze a first spectrum of a wavelength-division multiplexed optical signal amplified by an amplifier, a control unit configured to calculate a loss profile indicating a loss for each wavelength based on the first spectrum so that a second spectrum of the wavelength-division multiplexed optical signal to which the loss profile is added becomes flat, and a WSS (Wavelength Selective Switch) configured to add the loss profile to the wavelength-division multiplexed optical signal.