Heterogeneous Laser With Slot-Shaped Waveguide
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Solution Overview
Problem
Existing laser designs face inefficiencies due to challenges in coupling type III-V heterostructures with silicon waveguides, leading to suboptimal emission characteristics and manufacturing complexities.
Innovation Solution
A laser structure featuring a waveguide with a slot-shaped section covered by dielectric material, where the top and sides of the slot are coated with a low refractive index material, enhancing optical coupling and thermal management, and using distinct materials for the base and projection to simplify manufacturing and optimize mode localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If type III-V heterostructure is integrated with silicon waveguide, then emission characteristics are improved, but coupling efficiency and manufacturing complexity deteriorate
Solution Approach 1:
The waveguide is segmented into distinct material regions (base material and projection material) with different optical properties. This segmentation allows independent optimization of each region for specific functions while maintaining overall manufacturing feasibility through standardized fabrication processes.
Solution Approach 2:
Different materials are used in different locations of the waveguide structure. The base and projection are made of distinct materials with different refractive indices, allowing local optimization of optical confinement and coupling characteristics without requiring complete redesign of the entire structure.
2Productivity
If slot-shaped waveguide section is used, then optical coupling is enhanced, but propagation losses increase
Solution Approach 1:
The refractive index parameter is changed by using different materials for the base and projection. This parameter change allows the slot-shaped waveguide to achieve better optical coupling while the specific material selection minimizes propagation losses by optimizing the refractive index contrast and mode confinement.
3Temperature
If dielectric material coating is applied to slot, then thermal conductivity is enhanced, but manufacturing steps increase
Solution Approach 1:
The dielectric material coating step is merged with the existing waveguide fabrication process. By applying the dielectric coating during the standard manufacturing sequence rather than as a separate post-processing step, thermal management is enhanced without significantly increasing overall device complexity or manufacturing steps.
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 design improves laser efficiency by reducing propagation losses, enhancing thermal conductivity, and simplifying the manufacturing process, leading to improved coupling efficiency and reduced dimensions, thereby addressing the limitations of prior art.
Implementation Method 1
a waveguide optically coupled to the amplifier, and comprising a slot-shaped section whose apex is proximal to the amplifier, the apex of the slot and the lateral flanks of the slot being covered by a layer of a dielectric material
Implementation Method 2
the apex of the slot and the lateral flanks of the slot being covered by a layer of a dielectric material in the vicinity of the amplifier
Implementation Method 3
bond the first layer of dielectric material to the second layer of dielectric material by molecular bonding
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
The laser comprises an amplifier (1) with heterostructure of the type III-V, designed to generate an optical wave, and a waveguide (5) coupled optically to the amplifier (1), said waveguide having a hat-shaped cross section (6), the top (7) of which is proximal to the amplifier (1). The top (7) of the hat (6) and the lateral flanks (8a, 8b) of the hat (6) are covered with a layer (9) of a dielectric material in the vicinity of the amplifier (1). The hat is formed by a base (5a) and a projection of the waveguide (5), the material forming the base (5a) being distinct from the material forming the projection (5b).