Semiconductor Optical Integration with Split Cladding for Higher Output
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Solution Overview
Problem
Existing semiconductor optical integrated elements face limitations in achieving further increases in output for optical communication applications.
Innovation Solution
The semiconductor optical integrated element incorporates a laser active layer, optical modulation active layer, optical amplification active layer, and upper clad layers with distinct refractive indices to enhance the propagation and amplification of laser beams, ensuring efficient output and reduced light diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional semiconductor optical integrated element structure is used, then the device complexity is reduced and manufacturing is easier, but the output is limited and cannot be further increased
Solution Approach 1:
The semiconductor optical integrated element is divided into three separate active layers (laser active layer, optical modulation active layer, and optical amplification active layer) that are juxtaposed with each other. Each layer performs a specific function, allowing independent optimization of each component while achieving high overall output through their coordinated operation.
2Productivity
If upper clad layers with the same refractive index are used, then the manufacturing process is simpler, but light diffusion occurs and output is reduced
Solution Approach 1:
Different upper clad layers (first upper clad layer and second upper clad layer) are assigned different refractive indices tailored to the specific requirements of each active layer beneath them. This local optimization of optical properties prevents light diffusion at each interface while maintaining overall manufacturing feasibility through a systematic approach.
3Productivity
If the optical amplification active layer has high light density, then amplification is enhanced, but stimulated emission cannot continue continuously and output is limited
Solution Approach 1:
The optical paths of the laser active layer, optical modulation active layer, and optical amplification active layer are arranged in a juxtaposed configuration rather than a stacked configuration. This spatial arrangement in a different dimension allows the optical amplification active layer to maintain low light density while still receiving amplified light, enabling continuous stimulated emission and sustained high output.
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 configuration allows for increased output by maintaining low light density in the optical amplifier active layer, promoting continuous stimulated emission and amplification, thereby enhancing the overall output of the semiconductor optical integrated element.
Implementation Method 1
The semiconductor optical amplifier performs a function to increase light intensity by stimulated emission in accordance with the injected current
Implementation Method 2
The EA modulator performs a function for modulation with an effect of variation in light absorption spectrum of a semiconductor layer in accordance with an applied voltage
Implementation Method 3
The semiconductor optical amplifier performs a function to increase light intensity by stimulated emission in accordance with the injected current
Implementation Method 4
The first upper clad layer has a first index of refraction and is arranged on an upper surface of the laser active layer and an upper surface of the optical modulation active layer. The second upper clad layer has a second index of refraction different from the first index of refraction
Data Source
AI summary
A semiconductor optical integrated element includes a laser active layer, an optical modulation active layer, an optical amplification active layer, a first upper clad layer, and a second upper clad layer. The optical modulation active layer is juxtaposed to the laser active layer. The optical amplification active layer is juxtaposed to the optical modulation active layer. The first upper clad layer has a first index of refraction and is arranged on an upper surface of the laser active layer and an upper surface of the optical modulation active layer. The second upper clad layer has a second index of refraction different, and is juxtaposed to the first upper clad layer and arranged on an upper surface of the optical amplification active layer. Amplified laser beams outputted from the optical amplification active layer are outputted as being shifted above modulated laser beams outputted from the optical modulation active layer.