Optical Amplifier Input Signal Control for Stability
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Solution Overview
Problem
Optical communication networks face challenges in cost reduction and stability due to the need for real-time control of optical amplifiers, which are complex and require monitoring both input and output signal levels.
Innovation Solution
An optical amplifier system that includes a detecting section to monitor a part of the input optical signal and a control unit to adjust the excitation optical signal for a rare earth element doped optical fiber amplifier without real-time control based on the output signal, simplifying the configuration and improving resistance to transitional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time control based on output optical signal is implemented, then the optical amplifier can maintain stable output levels, but the device complexity and cost increase due to requiring both input and output signal monitoring
Solution Approach 1:
The invention extracts the essential control function by monitoring only the input optical signal level rather than requiring both input and output signal monitoring. The control unit determines excitation light intensity based solely on input signal characteristics, eliminating the need for output signal feedback paths and associated monitoring components, thus reducing device complexity while maintaining adequate output stability
Solution Approach 2:
The optical amplifier uses the input signal itself to control the excitation light intensity through the control unit, which determines the required excitation level based on input signal power and characteristics. This self-service approach eliminates external feedback requirements and simplifies the control architecture
2Reliability
If real-time control based on output optical signal is implemented, then the optical amplifier can compensate for signal variations, but the manufacturing cost increases due to additional monitoring and control components
Solution Approach 1:
The invention extracts the essential compensation function by implementing control based solely on input signal monitoring. This eliminates the need for expensive output signal monitoring components and feedback mechanisms, reducing manufacturing cost while maintaining the ability to compensate for signal variations through input-based excitation control
Solution Approach 2:
The invention employs a simpler, more cost-effective control architecture that uses only input signal monitoring rather than expensive dual-monitoring systems. The control unit and excitation light source form a streamlined configuration that reduces component count and manufacturing complexity
3Adaptability or versatility
If real-time control based on output optical signal is implemented, then the optical amplifier can adapt to changing conditions, but the resistance to transitional change decreases due to feedback loops and complex control mechanisms
Solution Approach 1:
The control unit determines the excitation light intensity in advance based on the detected input signal level and characteristics before the amplification process occurs. This preliminary determination approach avoids the instability introduced by real-time feedback loops, providing smooth transitions and improved resistance to transitional changes while maintaining adaptability to different input conditions
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 provides a cost-effective and stable optical amplifier that can control excitation levels based on input signal levels alone, reducing complexity and maintaining performance across various signal modulation techniques and bit rates, while being resistant to transitional changes.
Implementation Method 1
a rare earth element doped optical fiber amplifier configured to amplify a remaining part of the input optical signal supplied from the input side optical fiber by using an excitation optical signal supplied from a second node
Data Source
AI summary
An optical amplifier includes a detecting section configured to detect a part of an input optical signal from a first node on an input side optical fiber; and a rare earth element doped optical fiber amplifier configured to amplify a remaining part of the input optical signal supplied from the input side optical fiber by using an excitation optical signal supplied from a second node and to output the amplified optical signal as an output optical signal to an output side optical fiber. A control unit controls the excitation optical signal based on the detected part of the input optical signal by the detecting section without real time control based on the output optical signal.