Multi-Pulse Light Source Dispersion Compensation via Spatial Segmentation
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Solution Overview
Problem
In multi-pulse light sources, the pulse width of combined multi-pulse light is widened due to wavelength dispersion, affecting features like peak intensity, full width at half maximum, and peak time interval, with varying degrees of change for each pulse.
Innovation Solution
A multi-pulse light source with a dispersion compensation unit that includes a spectroscopic element, separation optical elements, and spatial light modulators to compensate dispersion for each wavelength component by guiding different wavelength component groups to distinct optical paths and applying phase modulation in separate modulation regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spatial light modulator is used with modulation regions aligned only in the spectral direction, then the device complexity is reduced, but the wavelength resolution and dispersion compensation effect are limited
Solution Approach 1:
The patent divides the spectral direction into multiple groups of wavelength components and assigns each group to a separate spatial light modulator. This segmentation allows each modulator to handle a specific portion of the spectrum, improving wavelength resolution and dispersion compensation effectiveness without requiring all wavelength components to be processed simultaneously on a single device.
Solution Approach 2:
The patent introduces a temporal dimension by processing different wavelength component groups at different times through separate spatial light modulators. This dimensional approach allows the system to achieve high wavelength resolution and dispersion compensation while maintaining manageable device complexity, as each modulator operates independently on its assigned spectral group.
2Device complexity
If multiple wavelength components are processed simultaneously on a single spatial light modulator, then the device complexity is reduced, but the dispersion compensation effect is limited due to wavelength resolution restrictions
Solution Approach 1:
The patent segments the wavelength components into multiple groups and processes each group through a separate spatial light modulator. This segmentation ensures that each modulator can apply optimized dispersion compensation patterns specific to its assigned wavelength range, thereby improving the overall dispersion compensation reliability while maintaining acceptable device complexity.
Solution Approach 2:
The patent applies local quality by tailoring the modulation patterns and processing parameters specifically for each wavelength component group handled by individual spatial light modulators. This localized optimization ensures that dispersion compensation is effectively tailored to the specific characteristics of each wavelength group, improving overall reliability.
3Adaptability or versatility
If different delays are applied to each wavelength component, then multi-pulse light with different central wavelengths is generated, but the pulse width is widened due to wavelength dispersion
Solution Approach 1:
The patent applies preliminary anti-action by using spatial light modulators to pre-compensate for wavelength dispersion before the pulse width widening effect can fully manifest. The modulators apply opposite phase corrections to the dispersed wavelength components, counteracting the dispersion-induced pulse broadening and maintaining tighter pulse widths despite the different delays applied to each wavelength group.
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 effectively improves wavelength resolution and significantly enhances the maximum amount of dispersion compensation, allowing for more precise compensation of dispersion in multi-pulse light with varying central wavelengths.
Implementation Method 1
a spectroscopic element configured to spectrally separate the plurality of wavelength components into respective wavelength components
Implementation Method 2
a first spatial light modulator including a first modulation region on which the first wavelength component group is incident, the first modulation region being configured to modulate for compensating dispersion for each wavelength component with respect to the first wavelength component group
Data Source
AI summary
In a multi-pulse light source, a dispersion compensation unit includes a spectroscopic element configured to spectrally separate a plurality of wavelength components, a separation optical element that guides a first optical pulse group including one or more wavelength components among a plurality of wavelength components, and a second optical pulse group including one or more wavelength components different from the one or more wavelength components included in the first optical pulse group among the plurality of wavelength components to optical paths different from each other, a first spatial light modulator on which the first optical pulse group is incident and which compensates dispersion for each wavelength component with respect to the first optical pulse group, and a second spatial light modulator on which the second optical pulse group is incident and which compensates dispersion for each wavelength component with respect to the second optical pulse group.