Optical Modulator Driving Signal Amplitude Control
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Solution Overview
Problem
Optical modulators driven by signals with amplitudes smaller than 2Vπ face challenges in precisely controlling output light, leading to degraded light signal quality due to difficulties in accurately managing the amplitude of the driving signal.
Innovation Solution
An optical transmitter system that includes an optical modulator, an acquisition part to determine the relationship between parameter fluctuations and output light fluctuations, and a controller to adjust the driving signal amplitude based on this relationship, ensuring precise control of the output light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an optical modulator is driven by a driving signal with an amplitude smaller than 2Vπ (linear region operation), then the device complexity is reduced and ease of operation is improved, but the manufacturing precision of the output light state deteriorates and the quality of the light signal degrades
Solution Approach 1:
The patent implements a feedback mechanism where the actual output light state is measured and compared with the target state, and the driving signal amplitude is automatically adjusted based on the deviation detected. This closed-loop control enables precise control of the output light state even when operating in the linear region with smaller amplitude signals, resolving the contradiction between ease of operation and manufacturing precision.
2Manufacturing precision
If the amplitude of the driving signal is controlled to achieve precise output light state, then the manufacturing precision is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent changes the control parameter from direct amplitude control to control based on the relationship between amplitude and output light state. By establishing and utilizing this relationship model, the system achieves precise control through parameter transformation rather than direct complex control, reducing the effective complexity while maintaining high precision.
3Manufacturing precision
If the relationship between driving signal parameter fluctuations and output light fluctuations is acquired and used for control, then the manufacturing precision is improved, but the measurement precision requirements increase
Solution Approach 1:
The patent performs preliminary characterization to acquire the relationship between driving signal parameters and output light state before actual operation. This pre-acquired relationship model is then used during normal operation to determine the appropriate driving signal amplitude, reducing the real-time measurement precision requirements while maintaining high manufacturing precision through the use of the pre-established model.
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 system enhances the quality of the light signal by accurately controlling the amplitude of the driving signal, thereby improving the precision and stability of the output light.
Implementation Method 1
an optical modulator (40) that is driven by a driving signal
Data Source
AI summary
An optical transmitter includes an optical modulator that is driven by a driving signal, an acquisition part, and a controller. The acquisition part obtains a relationship between a fluctuation of a parameter to adjust the driving signal and a fluctuation of a state of output light from the optical modulator due to the fluctuation of the parameter. The controller controls an amplitude of the driving signal on the basis of the obtained relationship.