Optical Waveform Reconstruction via Nonlinear Simulation
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Solution Overview
Problem
Conventional methods for obtaining the phase and time waveform of an optical signal require high technical expertise and stability, involving ultra high-speed time gates or reference light sources, making them complex and challenging to implement effectively.
Innovation Solution
A waveform reconstruction device that uses an input-spectrum obtaining unit, output-spectrum obtaining unit, phase-spectrum calculation unit, and waveform reconstruction unit to simulate the propagation of an optical signal through an optical transmission medium with a nonlinear optical effect, allowing for the reconstruction of a time waveform using a power spectrum of the output signal, thereby simplifying the process and reducing the time required to search for a phase spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods using ultra high-speed time gates or reference light sources are used to obtain phase information, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts and utilizes only the power spectrum information from the output optical signal, eliminating the need for complex time-gating equipment and reference light sources. By focusing on the power spectrum measurement and using numerical simulation to retrieve phase information, the system achieves phase measurement without requiring ultra high-speed time gates or reference light sources, thus reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent replaces the mechanical/optical time-gating system with a numerical simulation-based approach. Instead of using physical time gates or reference light sources to obtain phase information, the system uses computer simulation to calculate the phase spectrum from the measured power spectrum, substituting mechanical/optical systems with computational methods to achieve the same measurement goal with simpler equipment.
2Measurement precision
If conventional methods with ultra high-speed time gates are used to obtain time waveform information, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts only the essential power spectrum information from the output optical signal, removing the need for complex time-gating operations. The phase spectrum is then retrieved through numerical simulation rather than requiring manual time adjustment operations, significantly simplifying the operational process while maintaining time waveform measurement precision.
3Measurement precision
If both nonlinear optical effect and dispersion effect are considered in propagation simulation, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies partial action by initially considering only the nonlinear optical effect in the propagation simulation, excluding the dispersion effect to reduce computational time. This partial simulation approach allows for rapid phase spectrum retrieval while maintaining sufficient accuracy for the measurement goal, avoiding the time-consuming full simulation that would include both nonlinear optical effects and dispersion.
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 solution enables the reconstruction of a time waveform of an optical signal in a simplified manner, reducing the need for complex equipment and technical expertise, while maintaining accuracy and efficiency in phase spectrum determination.
Implementation Method 1
an optical transmission medium having a nonlinear optical effect
Implementation Method 2
simulate the propagation, based on one of a nonlinear optical effect and a dispersion effect
Implementation Method 3
perform frequency-time transform on the phase spectrum found through the search by the phase-spectrum calculation unit and the power spectrum indicated in the information obtained by the input-spectrum obtaining unit, to reconstruct the time waveform of the input optical signal
Data Source
AI summary
A waveform reconstruction device (140) includes: a phase-spectrum calculation unit (143) which (i) simulates, for each intensity of an input optical signal assumed to have a given phase spectrum, propagation of the input optical signal through an optical transmission medium, to calculate a power spectrum of an output optical signal, and (ii) performs iterations of simulating the propagation while changing the given phase spectrum to reduce differences between calculated power spectra and measured power spectra of the input optical signal having the intensities, to search for a phase spectrum of the input optical signal; and a waveform reconstruction unit (144) which reconstructs a time waveform of the input optical signal using the phase spectrum found through the search, wherein the phase-spectrum calculation unit (143) changes the given phase spectrum or simulates the propagation, based on a nonlinear optical effect or a dispersion effect.