Optical Module Dynamic Power Range Adjustment
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Solution Overview
Problem
In passive optical networks, the fixed optical power receiving range of optical modules in OLTs and ONUs leads to service interruptions due to varying optical power levels, resulting in bit errors.
Innovation Solution
An optical module with a variable feedback resistor circuit and a main control chip that dynamically adjusts the resistance value based on detected optical power, expanding the optical power receiving range and reducing bit error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed feedback resistor configuration is used in the optical module, then the device complexity is reduced and manufacturing is simplified, but the optical power receiving range becomes fixed and cannot adapt to varying optical power levels in actual environments
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed feedback resistor with a variable feedback resistor that can dynamically adjust its resistance value. The receiving part transitions from a static configuration to a dynamic one where the feedback resistor's resistance can be changed based on the detected optical power level, enabling adaptation to varying optical power ranges without increasing overall system complexity
Solution Approach 2:
The patent implements parameter changes by modifying the resistance value of the feedback resistor based on the optical power detection results. The system changes the electrical parameter (resistance) of the feedback resistor to adapt to different optical power levels, allowing the optical module to receive signals across a broader power range while maintaining simple hardware architecture
2Adaptability or versatility
If the optical power receiving range is extended to cover larger variations in actual environment, then the adaptability improves, but the receiving part exceeds the threshold of the fixed range resulting in service interruption and bit errors
Solution Approach 1:
The patent applies feedback by implementing an optical power detection module that continuously monitors the received optical power level and feeds this information back to the main control chip. The main control chip then adjusts the feedback resistor's resistance value based on the detected power level, creating a closed-loop control system that maintains reliable operation across varying environmental conditions and prevents service interruptions
Solution Approach 2:
The receiving part performs self-adjustment by automatically modifying its own feedback resistor configuration based on the detected optical power conditions. The system serves itself by detecting its own operating state and making necessary adjustments without external intervention, ensuring continuous reliable service across different power levels
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 effectively reduces bit error rates and enhances system robustness by dynamically adjusting the optical power receiving range to accommodate varying optical power levels, ensuring reliable operation across a broader power range.
Implementation Method 1
The avalanche photodiode generates an optical current I after receiving the optical signal. A value of the optical current is in direct proportion to an optical intensity value of the received optical signal.
Data Source
AI summary
A technology of dynamically adjusting an optical power receiving range of an optical module in a passive optical network is provided. In an optical module it includes an optical signal receive end receives an optical signal, an avalanche photodiode converts the optical signal into an optical current, an optical power detection module obtains an optical power value of the optical current, a main control chip adjusts a resistance value of a variable feedback resistor circuit according to the optical power value, and a transconductance amplifier outputs a voltage according to the resistance value of the variable feedback resistor circuit and the optical current. In this way, a bit error rate is effectively reduced, an optical power receiving range of the optical module is expanded, and system robustness is enhanced.