Optical Module Life Prediction Using Bias Current Digit Changes
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Solution Overview
Problem
Existing methods for predicting the life of optical modules, particularly those using laser diodes, face inaccuracies due to linear approximation of bias current values, leading to deviations in predicted deterioration times as the time approaches the true deterioration time.
Innovation Solution
A life prediction method and device that acquires bias current values from optical modules, calculates the difference in digits of the bias current, and estimates remaining life using a time interval for carry occurrence, approximating the bias current with an exponential function to accurately estimate the optical module's life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If linear approximation based on bias current values at two past times is used, then the prediction method is simple, but the predictive value of deterioration time deviates from the true deterioration time as the prediction time is farther from the true time
Solution Approach 1:
The patent changes the mathematical model from linear approximation to exponential function approximation. Specifically, it uses the relationship that bias current increases exponentially with elapsed time, and transforms the prediction problem into calculating the time required for the bias current to reach a threshold value using exponential growth formulas, thereby improving prediction accuracy while maintaining computational simplicity
Solution Approach 2:
The patent performs preliminary calculation of the exponential growth rate and threshold time based on historical bias current data. By pre-establishing the exponential model parameters and threshold values, the system can quickly predict deterioration time without complex real-time calculations, resolving the contradiction between simplicity and accuracy
2Measurement precision
If exponential function approximation is used to model bias current increase, then the predictive accuracy of deterioration time is improved, but the calculation complexity increases
Solution Approach 1:
The patent transforms the exponential prediction problem into a logarithmic calculation problem. By taking the logarithm of both sides of the exponential growth equation, the system converts complex exponential calculations into simpler linear calculations, maintaining high prediction accuracy while reducing computational complexity
Solution Approach 2:
The patent uses historical bias current data to create a simplified exponential model that copies the essential growth pattern. Instead of using complex real-time exponential calculations, the system establishes a simplified exponential relationship based on past data, which can be quickly applied for prediction without heavy computational burden
Data Source
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AI summary
A life prediction method for an optical module (2) that keeps optical output constant by controlling a bias current that is applied to a laser diode includes, by a life prediction device (1): a first step of acquiring a current value of the bias current from the optical module (2); a second step of holding an initial bias current value that is an initial current value of the bias current; a third step of calculating the number of digits of a difference value between the bias current value and the initial bias current value, and determining whether there is an increase in the number of digits; a fourth step of calculating a time interval at which occurrence of the increase in the number of digits is detected; and a fifth step of estimating a life of the optical module (2) using the time interval, a first threshold, and the number of digits.