Ridge Waveguide Laser Flared Facet Optical Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Distributed feedback (DFB) lasers face limitations in achieving single-mode behavior due to inadequate control over grating modes, leading to inefficient light emission and catastrophic optical damage when operating near critical intensity levels, which restricts their high-speed optical communication capabilities.
Innovation Solution
The design incorporates a flared facet configuration for the laser die, increasing the facet area to enhance optical strength and emission without exceeding catastrophic optical damage thresholds, thereby optimizing light emission and reducing sensitivity to transverse modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the facet area is increased to enhance optical power emission, then the optical strength is improved, but the risk of catastrophic optical damage increases when operating near critical intensity levels
Solution Approach 1:
The patent applies flared facets that extend the emission area laterally, transitioning from a simple planar facet to a three-dimensional flared structure. This dimensional change increases the effective emission area without concentrating the optical intensity, thereby enhancing optical power emission while maintaining operational safety below catastrophic optical damage thresholds.
2Device complexity
If the grating modes are not adequately controlled, then the device complexity is reduced, but the single-mode behavior is compromised leading to inefficient light emission
Solution Approach 1:
The patent introduces localized flared facet structures at the emission ends of the laser device. These flared facets create specific local optical conditions that suppress transverse modes and enhance single-mode behavior. By modifying only the local geometry at the facets rather than the entire grating structure, the patent achieves improved light emission efficiency while maintaining relatively simple device architecture.
Data Source
AI summary
Embodiments disclosed herein relate to a laser die. The laser die includes a base epitaxial portion, a mesa portion, and first and second facets, wherein at least one of the first and second facets is flared such that an area of the facet is increased. Embodiments disclosed herein also relate to a high-speed laser. The high-speed laser includes a substrate, an active region positioned above the substrate, a mesa positioned above the active region, and one or more facets, wherein at least one of the one or more facets includes a flared portion configured to increase an area of the facet.