Semiconductor Laser Electrode Layout for Lower Absorption Loss
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Solution Overview
Problem
Semiconductor laser devices with integrated distributed feedback (DFB) laser and semiconductor optical amplifier (SOA) regions face issues with light absorption and leakage current due to the separation of electrodes, leading to increased light loss and reduced insulation resistance.
Innovation Solution
A semiconductor laser device design where a single electrode extends over both the laser and amplification regions, applying a voltage to inject current and reduce light absorption and leakage current, with adjustable mesa widths to control electrical resistance and current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrodes are separated in laser and amplification regions, then current injection can be controlled independently in each region, but light absorption increases and leakage current occurs due to insufficient insulation
Solution Approach 1:
An insulating film is introduced as an intermediary layer between the electrode and the active layer in the amplification region. This insulating film prevents direct contact between the electrode and active layer, thereby reducing light absorption loss while still allowing current to be injected into the active layer through the insulating film. The insulating film acts as a mediator that resolves the contradiction between needing electrode proximity for effective current injection and needing electrode separation for insulation to prevent light absorption.
2Adaptability or versatility
If electrodes are separated in laser and amplification regions, then current injection can be controlled independently in each region, but insulation resistance decreases leading to increased leakage current
Solution Approach 1:
The insulating film serves as a mediator that maintains high insulation resistance between the electrode and active layer while still allowing functional current injection. By introducing this intermediary layer, the system achieves both independent current control capability and reliable insulation, preventing leakage current between regions.
3Productivity
If electrode is placed close to active layer for effective current injection, then current injection efficiency improves, but light absorption by active layer increases
Solution Approach 1:
The insulating film acts as a thin intermediary layer that allows the electrode to remain close to the active layer for effective current injection while preventing excessive light absorption. The insulating film is positioned between the electrode and active layer, maintaining the proximity needed for good electrical contact while reducing the harmful optical interaction.
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 reduces light absorption and leakage current, enhancing the efficiency of the semiconductor laser device by ensuring consistent current injection across the active layer and minimizing power loss.
Implementation Method 1
a laser region including an active layer and configured to generate light
Implementation Method 2
an amplification region including the active layer and configured to amplify the light
Data Source
AI summary
A semiconductor laser device includes a laser region including an active layer and configured to generate light, an amplification region including the active layer and configured to amplify the light, the amplification region being adjacent to the layer region, and an electrode provided to extend over the laser region and the amplification region.