Widely Tunable Laser System With Integrated Optical Combining
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Solution Overview
Problem
Existing widely tunable laser systems face challenges in achieving wide tunability due to limitations in wavelength range and efficiency, with solid-state lasers restricted to small wavelength ranges and free space optics being large, expensive, and slow in wavelength tuning.
Innovation Solution
A widely tunable laser system is developed by integrating multiple independently tunable laser sources with different gain media on a substrate, using optical combining devices like echelle gratings and Mach-Zehnder interferometers to efficiently switch and combine light from these sources into a single output, allowing for a wide tunability range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If solid-state lasers are used, then the device is compact and efficient, but the wavelength range is limited to small ranges
Solution Approach 1:
The patent divides the laser system into multiple independent laser sources, each with a different gain medium optimized for a specific wavelength range. These segmented laser sources are then combined using optical switching and combining techniques to achieve a widely tunable output that exceeds the capability of any single laser source.
2Adaptability or versatility
If free space optics are used for wide tunability, then the wavelength range is increased, but the device becomes large, expensive, and slow in tuning speed
Solution Approach 1:
The patent replaces mechanical free-space optics with integrated photonic circuitry and optical switching mechanisms. This substitution enables faster wavelength tuning by eliminating mechanical moving parts while maintaining the ability to switch between different wavelength ranges through electronic control of the optical switches and modulators.
3Adaptability or versatility
If multiple laser sources are integrated on a substrate, then the tunability range is extended, but the device complexity increases
Solution Approach 1:
The patent merges multiple laser sources with different gain media onto a single substrate, along with optical switching and combining components. This integration consolidates what would otherwise be separate devices into a unified system, achieving wide tunability while managing complexity through systematic arrangement and integration of components.
4Productivity
If traditional laser systems are used, then the structure is simple, but the cost is high and tuning speed is slow
Solution Approach 1:
The patent introduces dynamic control mechanisms including optical switches and modulators that enable rapid switching between different wavelength ranges. This dynamic capability allows the system to adapt quickly to different wavelength requirements, achieving high tuning speeds through electronic control rather than mechanical adjustment.
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 a wide tunability range of over 50 nm with efficient switching and power maintenance across the range, reducing costs and increasing speed compared to traditional methods.
Implementation Method 1
switching the one or more optical combining devices so as to direct light from one or more selected ones of the plurality of individually tunable lasers through the combining arrangement into the single output
Implementation Method 2
The optical combining device is configured to direct light from one or both of the first laser and the second laser to the output
Data Source
AI summary
A widely tunable laser system includes a substrate, first and second lasers, an output and at least one optical combining device. The first laser is integrated with the substrate, includes a gain medium that includes a first material, and emits light at a wavelength that is tunable within a first wavelength range that is determined at least in part by the first material. The second laser is integrated with the substrate, includes a gain medium that includes a second material, and emits light at a wavelength that is tunable within a second wavelength range that is different from the first wavelength range that is determined at least in part by the second material. The at least one optical combining device is configured to direct light from one or both of the first laser and the second laser to the output.