Optical Transmission Measurement Device Using Frequency-Modulated CW Light
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Solution Overview
Problem
In optical transmission systems, measuring transmission characteristics with high accuracy and speed is challenging due to the trade-off between measurement time and accuracy, where fine changes in center frequency improve accuracy but lengthen measurement time, while larger changes in center frequency shorten time but reduce accuracy.
Innovation Solution
A measurement device that generates frequency-modulated CW light and calculates transmission characteristics based on average and amplitude components of optical power, using interpolation methods to reduce the number of measurements and achieve high accuracy in less time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the center frequency is finely changed to measure transmission characteristics, then measurement accuracy is improved, but measurement time becomes longer
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing transmission characteristics data at multiple center frequencies before actual measurement. The system prepares a lookup table with pre-computed transmission characteristics for various frequency points, allowing the measurement device to quickly retrieve and interpolate results without performing time-consuming real-time calculations at each frequency point.
Solution Approach 2:
The patent uses partial action by measuring transmission characteristics at selectively chosen frequency points rather than continuously across the entire frequency range. The system identifies key frequency points where measurements are most critical and performs measurements only at those points, then interpolates results for intermediate frequencies, reducing the total number of measurements required.
2Productivity
If the center frequency is changed by a large extent to shorten measurement time, then measurement speed is improved, but measurement accuracy is reduced
Solution Approach 1:
The patent applies dynamics by making the frequency step size adaptive rather than fixed. The system dynamically adjusts the extent of center frequency changes based on the measured transmission characteristics and the interpolation algorithm's performance. When transmission characteristics change rapidly, the system reduces the frequency step size to maintain accuracy; when changes are gradual, it increases the step size to improve measurement speed.
Solution Approach 2:
The patent uses parameter changes by modifying the frequency deviation parameter dynamically during measurement. The system changes the extent of center frequency variation based on real-time assessment of transmission characteristic stability and measurement requirements, optimizing the balance between measurement speed and accuracy for different operating 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
Enables accurate and efficient measurement of optical transmission characteristics by reducing the number of measurements required, thereby improving measurement speed and accuracy.
Implementation Method 1
a transmitter (Tx) generates a frequency-modulated CW light so as to transmit the frequency-modulated CW light to a path
Implementation Method 2
the receiver (Rx) measures an optical power of the received CW light every time the center frequency of the CW light is changed and transmitted by the transmitter (Tx)
Data Source
AI summary
A transmitter generates a frequency-modulated CW light so as to transmit it to a path. A receiver receives the CW light that has passed through passband filters included in the path. The receiver includes a processor. The processor measures an optical power of the received CW light every time a center frequency of the CW light is changed and transmitted by the transmitter. The processor calculates transmission characteristics of the CW light that has passed through the passband filters, on the basis of an average value of the optical power that corresponds to a center frequency of the CW light and on the basis of an amplitude component that indicates an amount of change in the optical power, the average value and the amplitude component being obtained as a result of the measurement.