Auto-tunable Optical Transceiver Modules with VOA Calibration
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Solution Overview
Problem
Current fiber optic communication systems require manual tuning of variable optical attenuators (VOAs) using external equipment, which is inefficient, expensive, and time-consuming, and lacks automation for optimal performance.
Innovation Solution
The implementation of an auto-tuning method that uses optical switches and existing components within the system to automatically adjust VOAs on both the transmitter and receiver sides based on optical signal power comparisons, eliminating the need for external test benches and enabling efficient calibration without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual tuning of VOAs using external test bench equipment is used, then tuning accuracy can be achieved, but the process is time-consuming and expensive
Solution Approach 1:
The optical communication system performs self-diagnosis and self-tuning by using its own internal optical source and existing components to automatically adjust VOA settings, eliminating the need for external test equipment and manual intervention while maintaining tuning accuracy
Solution Approach 2:
The system implements an automatic feedback mechanism where the optical source transmits test signals, the receiver measures optical signal power, and the system automatically adjusts VOA settings based on the measured values to achieve optimal tuning without external equipment
2Manufacturing precision
If manual tuning using external test bench is used, then proper calibration can be achieved, but system complexity and cost increase
Solution Approach 1:
The optical source and receiver are designed to serve dual purposes: they function as communication components during normal operation and as tuning/test components during calibration, eliminating the need for separate external test equipment and reducing overall system complexity
Solution Approach 2:
The tuning function is merged with the existing communication components by integrating the optical source, receiver, and VOA control into a unified automatic tuning system, removing the need for separate external test benches and reducing system complexity
3Productivity
If automatic tuning within the system is implemented, then tuning time is reduced, but measurement precision may be compromised
Solution Approach 1:
The system uses a closed-loop feedback mechanism where the receiver continuously measures optical signal power and the controller automatically adjusts VOA settings based on these measurements, ensuring both speed and accuracy in the tuning process
Solution Approach 2:
The system performs self-measurement and self-adjustment using its own receiver and optical source, enabling rapid automatic tuning while maintaining measurement precision through the use of existing calibrated components
Data Source
AI summary
Techniques for tuning an optical communication system are disclosed. The system includes a first signal path for transmitting data, including an optical source, a first one or more variable optical attenuators (VOAs), a modulator, and a transmission fiber. The system further includes a second signal path for receiving data, including a receiver fiber and a second one more VOAs. The first one or more VOAs are tuned using the optical source in the first signal path for transmitting data, based on comparing a plurality of optical signal power values in the first path while a first tuning mode is enabled. The second one or more VOAs are tuned, using the optical source in the first signal path for transmitting data, based on comparing a plurality of optical signal power values in the second path while a second tuning mode is enabled.