Integrated Laser Modulator With AlInAs E-Stopper for Leakage Control
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Solution Overview
Problem
Semiconductor edge-emitting diode lasers associated with the InGaAsP material system suffer from high vertical leakage currents, especially at high temperatures, due to the inability to create an effective electron barrier, and the incorporation of an AlInAs e-stopper layer is hindered by oxidation issues that lead to defect formation and reduced PIC reliability.
Innovation Solution
An integrated laser modulator with an e-stopper layer comprising aluminum indium arsenide (AlInAs) is disposed greater than 100 nanometers away from the quantum elements of the laser active region, and encapsulating layers are used to prevent oxidation, thereby minimizing defects and enhancing the reliability of the photonic integrated circuit (PIC).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an AlInAs e-stopper layer is incorporated into the InGaAsP laser structure to reduce vertical leakage currents, then the laser efficiency is improved, but oxidation of the AlInAs layer occurs leading to defect formation and reduced PIC reliability
Solution Approach 1:
An InGaAsP barrier layer is introduced as an intermediary between the AlInAs e-stopper layer and the surrounding environment. This intermediate layer prevents direct exposure of the AlInAs to oxidizing conditions while maintaining the electron-blocking function of the e-stopper, thus eliminating oxidation defects without sacrificing leakage current suppression
Solution Approach 2:
The patent creates a composite structure combining AlInAs e-stopper layer with InGaAsP barrier and cladding layers. This composite approach allows the AlInAs to provide electron blocking while the InGaAsP layers provide oxidation protection and lattice matching, achieving both low leakage current and high reliability
2Loss of energy
If the AlInAs e-stopper layer is placed close to the quantum elements to maximize electron blocking, then vertical leakage current is reduced, but defect formation increases due to oxidation and lattice mismatch
Solution Approach 1:
The InGaAsP barrier layer serves as a mediator positioned between the AlInAs e-stopper and the quantum elements. It maintains the electron-blocking effectiveness while providing a lattice-matched interface that reduces defect formation and prevents oxidation of the AlInAs layer
Solution Approach 2:
The patent applies different material compositions at different locations: AlInAs with high aluminum content for electron blocking, InGaAsP with optimized composition for lattice matching and oxidation resistance at critical interfaces, creating locally optimized properties throughout the structure
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 implementation of the AlInAs e-stopper layer effectively reduces vertical leakage currents, improves the efficiency of the laser active region, and enhances the reliability of the PIC by minimizing defect formation at the interface between the laser and modulator regions.
Implementation Method 1
The AlInAs layer can provide a barrier to electrons passing from the n-side of the laser to the p-side of the laser
Implementation Method 2
incorporation of an AlInAs e-stopper layer is hindered by oxidation issues that lead to defect formation
Data Source
AI summary
An integrated laser modulator includes a substrate, a laser active region disposed on the substrate, a modulator region disposed on the substrate, and an e-stopper layer disposed on at least the laser active region. The substrate and the laser active region are associated with an indium gallium arsenide phosphide (InGaAsP) material system. The modulator region is associated with InGaAsP material system or an aluminum indium gallium arsenide (AlInGaAs) material system. The e-stopper layer comprises aluminum indium arsenide (AlInAs). The e-stopper layer is disposed greater than 100 nanometers away from a quantum element of the laser active region. The modulator region includes an end surface that interfaces with an end surface of the laser active region.