Tunable Laser Using Vernier Effect for Wide Tunability
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Solution Overview
Problem
The manufacturing of hybrid lasers is challenging due to the incompatibility between III-V semiconductor and silicon production lines, making it difficult to produce tunable lasers with wide tunability, high side mode suppression ratio, small footprint, and simple fabrication.
Innovation Solution
A tunable laser is developed using III-V semiconductor materials on a single chip, where the laser cavities are formed without a silicon waveguide, utilizing a structure with III-V waveguides of different widths and refractive index layers to achieve precise wavelength tuning through the Vernier effect, allowing for continuous or discrete wavelength variation over a significant range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hybrid lasers are manufactured using both III-V semiconductor and silicon production lines, then the laser can achieve wide tunability and high performance, but the manufacturing process becomes complex and incompatible
Solution Approach 1:
The patent merges the gain section function and waveguide function into a single III-V semiconductor waveguide structure. The waveguide includes a core region with gain medium and cladding regions, eliminating the need for separate hybrid integration of III-V and silicon components. This integration resolves the manufacturing complexity while maintaining wide tunability through the Vernier effect using two laser cavities with different effective refractive indices.
Solution Approach 2:
The III-V semiconductor waveguide is designed to perform multiple functions simultaneously: it serves as the gain medium, the optical waveguide, and the structural element for achieving Vernier tuning. This multi-functionality eliminates the need for separate silicon waveguide components, simplifying the manufacturing process while achieving the desired performance characteristics.
2Reliability
If hybrid lasers integrate III-V and silicon sections, then performance requirements can be met, but separate processing of different materials is required
Solution Approach 1:
The patent uses homogeneous III-V semiconductor material throughout the waveguide structure, eliminating the need for heterogeneous integration of silicon and III-V sections. The waveguide core and cladding are both formed from III-V materials with different refractive indices, allowing single-material fabrication processes while achieving high side mode suppression ratio through precise control of the Vernier effect.
3Adaptability or versatility
If tunable lasers are designed with wide tunability, then wavelength range increases, but device footprint and complexity increase
Solution Approach 1:
The patent employs dynamic wavelength tuning through the Vernier effect by adjusting the injection currents in two laser cavities with different effective refractive indices. This dynamic control mechanism enables wide wavelength tuning range without requiring physically large device structures, as the tuning is achieved through electrical control of the cavity resonance conditions rather than mechanical adjustment of large components.
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
This approach enables the production of tunable lasers with a wide range of tunability, high side mode suppression ratio, and a small footprint, simplifying the manufacturing process by eliminating the need for separate processing of III-V and silicon sections, and allowing for efficient mass production.
Implementation Method 1
utilizing a structure with III-V waveguides of different widths and refractive index layers to achieve precise wavelength tuning through the Vernier effect, allowing for continuous or discrete wavelength variation over a significant range
Data Source
AI summary
Examples of the present disclosure include a tunable laser comprising a waveguide including gain section. The waveguide overlies and is optically coupled to another waveguide. The another waveguide has a reflector at one end. A laser cavity is formed in the waveguides.