Optical Transceiver Extinction Ratio Testing Under Temperature Drift
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Solution Overview
Problem
The existing extinction ratio test for optical transceiver modules has a low pass rate, particularly due to temperature variations, which affects production capacity.
Innovation Solution
An extinction ratio testing system comprising a microcontroller, an extinction ratio tester, and a thermostat that controls the optical transceiver module's temperature and laser operating current to ensure the extinction ratio meets standards, including a counter to track current adjustments and determine module qualification or failure based on repeated adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical transceiver module is tested at different temperatures separately, then the testing accuracy is improved, but the production capacity deteriorates
Solution Approach 1:
The patent combines multiple temperature testing procedures into a single integrated testing process. The system performs normal temperature extinction ratio testing, high temperature extinction ratio testing, and high temperature high current extinction ratio testing in sequence without removing the module from the testing system, thereby maintaining testing accuracy while improving production capacity.
Solution Approach 2:
The system performs preliminary testing at normal temperature before high temperature testing. This preliminary action identifies modules that pass early, allowing the system to proceed efficiently through subsequent testing stages without unnecessary delays.
2Reliability
If multiple testing procedures are performed sequentially, then the testing thoroughness is improved, but the testing time deteriorates
Solution Approach 1:
The testing process is segmented into distinct but integrated procedures: normal temperature extinction ratio testing, high temperature extinction ratio testing, and high temperature high current extinction ratio testing. Each segment focuses on specific performance aspects and can be executed in sequence without breaking the overall testing flow, reducing total testing time while maintaining thoroughness.
Solution Approach 2:
The system maintains continuous testing action throughout the process. The module remains in the testing system throughout all procedures, and the system continuously monitors performance parameters. This continuous action eliminates idle time between testing stages and ensures that useful testing activity occurs throughout the entire process.
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
Improves the pass rate of extinction ratio tests by effectively testing optical transceiver modules at various temperatures and adjusting laser current to meet performance standards, thereby enhancing production efficiency.
Implementation Method 1
the microcontroller is configured to control the thermostat to maintain the optical transceiver module at a predetermined high temperature
Implementation Method 2
a laser diode 204, an optical fiber 206
Data Source
AI summary
An extinction ratio testing system (10) includes a microcontroller (102), an extinction ratio tester (104), and a thermostat (106). The microcontroller (102) controls the thermostat (106) to maintain an optical transceiver module (20) at a predetermined high temperature, and then the microcontroller (102) controls the extinction ratio tester (104) to test an extinction ratio of the optical transceiver module (20). If the extinction ratio is lower than a standard extinction ratio, the microcontroller (102) controls the optical transceiver module (20) to increase a laser operating current (212) of the optical transceiver module (20) to increase the extinction ratio.