Fiber Amplifier Gain Flattening With Wavelength-Level Adjustment
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Solution Overview
Problem
Existing fiber amplifiers, such as erbium-doped fiber amplifiers, exhibit non-flat gain curves, leading to varying gains for optical signals with different wavelengths, which increases bit error rates and affects transmission performance.
Innovation Solution
A fiber amplifier system with a first power amplifier, a wavelength level adjuster, and a controller that performs precise power adjustments on each wavelength, using control signals to fine-tune the gain curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a built-in gain flattening filter is used to adjust the gain curve, then the overall gain curve can be adjusted, but adjustment precision is insufficient and cannot reach wavelength level
Solution Approach 1:
The patent divides the gain adjustment function into multiple independent wavelength-level adjustment units. Each unit corresponds to a specific wavelength range and can be adjusted independently, transforming the single coarse adjustment into multiple fine adjustments across different wavelength segments, thereby achieving wavelength-level precision without requiring a completely new system architecture
Solution Approach 2:
The patent introduces a new dimension of control by adding wavelength-selective adjustment capability to the traditional overall gain control. This creates a two-dimensional adjustment space (overall gain + wavelength-specific gain), allowing precise control at wavelength level while maintaining the simplicity of the original single-stage amplifier structure
2Measurement precision
If multiple adjustment components are added to achieve wavelength-level gain adjustment, then adjustment precision improves, but device complexity increases
Solution Approach 1:
The patent designs the wavelength-level adjustment units to be multi-functional, where each unit can simultaneously perform gain adjustment, wavelength selection, and signal routing functions. This reduces the need for separate dedicated components for each function, achieving wavelength-level precision while limiting the increase in overall device complexity
Solution Approach 2:
The patent implements a nested structure where wavelength-level adjustment units are integrated within the existing amplifier framework. The adjustment units are embedded in the signal path without requiring complete structural overhaul, allowing precise wavelength-level control while maintaining the compactness of the original device
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 system achieves precise adjustment of the gain curve to a wavelength level, improving system flatness and reducing power jitter, while eliminating the need for additional power equalizers.
Implementation Method 1
a wavelength level adjuster and a controller... the wavelength level adjuster is configured to perform power adjustment on each wavelength
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
A fiber amplifier (100) and a gain adjustment method for the fiber amplifier (100) are provided. The fiber amplifier (100) includes a first power amplifier (101), a wavelength level adjuster (102), and a controller (103), where the first power amplifier (101) and the wavelength level adjuster (102) are sequentially connected; the controller (103) includes a first input end and a control output end, where the first input end is configured to receive an input optical signal of the fiber amplifier (100), and the control output end is configured to output a first amplification control signal to the first power amplifier (101), and output an adjustment control signal to the wavelength level adjuster (102); and the wavelength level adjuster (102) is configured to perform power adjustment on each wavelength based on the adjustment control signal. The fiber amplifier (100) can perform power adjustment on each wavelength of the fiber amplifier (100), thereby improving adjustment precision of a gain curve of the fiber amplifier (100).