Optical Amplifier Gain Switching With Shared Dynamic Equalization
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Solution Overview
Problem
Optical amplifiers face issues of noise figure (NF) performance deterioration and high implementation costs due to limited dynamic range and imperfect gain spectrum matching across stages, leading to suboptimal OSNR and increased insertion loss.
Innovation Solution
An optical amplifier design incorporating at least two stages of optical amplifier units, an optical switch, and a dynamic gain equalizer (DGE) with a control circuit to adjust gain modes and attenuation spectra, allowing for flexible power attenuation processing across different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dynamic range of the optical amplifier is increased to cope with more link loss scenarios, then the adaptability is improved, but the noise figure performance deteriorates
Solution Approach 1:
The patent implements a dynamic gain equalizer that can adjust its attenuation characteristics in real-time based on the operating conditions. The gain equalizer's attenuation spectrum is dynamically controlled to match the gain spectrum of the optical amplifier units, allowing the system to maintain optimal NF performance across different dynamic ranges. This dynamic adjustment capability enables the optical amplifier to adapt to varying link loss scenarios while preserving noise figure performance through active compensation.
2Adaptability or versatility
If multiple stages of optical amplifier units are added to extend the gain interval range, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent designs a shared dynamic gain equalizer that serves multiple optical amplifier units simultaneously. This single DGE unit can dynamically adjust its attenuation spectrum to compensate for the combined gain characteristics of different numbers and combinations of optical amplifier units. By making the gain equalizer universal and multi-functional, the system can achieve extended gain interval range without proportionally increasing the number of equalizer units, thus reducing overall device complexity while maintaining adaptability.
Solution Approach 2:
The patent merges the functions of multiple gain equalizers into a single shared dynamic gain equalizer that serves all optical amplifier units. This consolidation approach reduces the total number of components while maintaining the ability to compensate for gain variations across different operating configurations. The shared DGE integrates the attenuation functions that would otherwise require separate equalizer units for each amplifier stage.
3Manufacturing precision
If fixed gain equalizers are used in each stage of optical amplifier units, then the manufacturing precision is improved, but the adaptability deteriorates
Solution Approach 1:
The patent replaces fixed gain equalizers with a dynamic gain equalizer that can adjust its attenuation spectrum in real-time. This dynamic equalizer receives control signals that dictate its attenuation characteristics, allowing it to adapt to different gain modes and optical amplifier configurations. The dynamic nature of the equalizer maintains precise gain spectrum matching across varying operating conditions, something that fixed equalizers cannot achieve when the system configuration changes.
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 enhances NF performance, extends the gain interval range, reduces implementation complexity, and lowers costs by enabling multiple gain modes to share a DGE, thereby simplifying the optical amplifier's structure and reducing maintenance expenses.
Implementation Method 1
Each stage of optical amplifier unit includes an input/output port, an optical isolator (ISO), a wavelength division multiplexer (WDM), a pump laser, and an erbium-doped optical fiber (EDF)
Data Source
AI summary
An optical amplifier includes at least two stages of optical amplifier systems, an optical switch, a dynamic gain equalizer (DGE), and a control circuit. An input end of the optical switch is separately coupled to an output end of a first-stage optical amplifier system and an output end of a second-stage optical amplifier system, and an output end of the optical switch is separately coupled to an input end of the second-stage optical amplifier system and an input end of the DGE. The optical switch is configured to set at least two gain modes of the optical amplifier. The control circuit is configured to adjust an attenuation spectrum of the DGE based on the at least two gain modes set by the optical switch. The DGE is configured to perform, based on an adjusted attenuation spectrum, power attenuation processing on signals of different wavelengths in a received optical signal.