Optical Phase Modulator Symmetric Waveform Shaping
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Solution Overview
Problem
Existing optical phase modulation techniques struggle to shape pulse waveforms with symmetry and high-speed response due to limitations in drive device and optical modulator speeds, leading to asymmetric waveforms and increased power consumption.
Innovation Solution
An optical transmission system incorporating a first, second, and third optical modulator, with signal output and waveform shaping signals timed relative to each other to achieve symmetric waveform shaping, including a third modulator driven earlier than the first, allowing for undershoots and overshoots before rising/falling edges, and using edge detection devices for improved power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single optical modulator is used for phase modulation, then the device complexity is low, but the waveform shaping capability and response speed are limited
Solution Approach 1:
The patent divides the waveform shaping function into multiple optical modulators (first, second, and third optical modulators), each responsible for specific timing segments of the waveform. The first modulator handles the main modulation, the second modulator adds overshoot/undershoot after rising/falling edges, and the third modulator adds overshoot/undershoot before rising/falling edges, enabling complete waveform shaping through segmentation of functions.
Solution Approach 2:
The third optical modulator performs preliminary action by introducing overshoot and undershoot components before the main rising/falling edges of the waveform. This anticipatory adjustment compensates for the finite response speed of the optical modulators, ensuring that the overall waveform achieves the desired high-speed response characteristics.
2Productivity
If the drive device and optical modulator operate at high speed, then the symbol frequency can be improved, but the device complexity and power consumption increase
Solution Approach 1:
The third optical modulator performs preliminary waveform shaping before the main modulation event, pre-adjusting the waveform to compensate for the finite response speed. This allows the system to achieve high symbol frequencies without requiring the drive device and optical modulators to operate at excessively high speeds, thereby reducing power consumption.
Solution Approach 2:
The patent introduces intermediate waveform shaping signals generated by the second and third optical modulators that act as mediators between the drive device and the final optical output. These intermediate signals process and adjust the waveform characteristics, enabling high-speed operation with reduced power consumption by distributing the processing workload.
3Manufacturing precision
If overshoot and undershoot are added to shape the waveform, then the waveform symmetry and speed are improved, but the device complexity increases
Solution Approach 1:
The waveform shaping function is segmented into distinct modules: the first optical modulator for main phase modulation, the second optical modulator for post-edge overshoot/undershoot, and the third optical modulator for pre-edge overshoot/undershoot. Each module handles a specific aspect of waveform shaping, achieving precise control through modular segmentation rather than a single complex device.
Solution Approach 2:
The patent applies local quality by introducing waveform shaping components (overshoot and undershoot) only at specific locations in the waveform timeline - before and after the rising/falling edges - rather than uniformly across the entire waveform. This localized adjustment achieves precise waveform shaping with minimal additional complexity.
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 achieves high-speed, symmetric waveform responses and reduces power consumption by effectively shaping pulse waveforms and adjusting overshoots and undershoots, suitable for high-speed optical communication systems.
Implementation Method 1
the phase of light passing through the optical waveguide is modulated by applying voltages to these optical modulators
Data Source
AI summary
The optical transmission system includes signal output means (11S) for outputting a drive signal according to an input signal to the first optical modulator (11a), first waveform shaping signal output means (12S) for outputting a first waveform shaping signal to the second optical modulator (10A), and second waveform shaping signal output means (13S) for outputting a second waveform shaping signal to the third optical modulator (13a). The first waveform shaping signal is output to the second optical modulator (10A) at a timing relatively later than a timing of an output of a signal by the first optical modulator (11a). The second waveform shaping signal is output to the third optical modulator (13a) at a timing relatively earlier than the timing of the output of the signal by the first optical modulator (11a).