Light Emitting Element With Segmented Electrodes
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Solution Overview
Problem
Integrated semiconductor lasers and monitor photodiodes often suffer from electrical crosstalk due to shared electrodes, which deteriorates signal-to-noise ratio and makes accurate automatic power control difficult, especially in differential driving configurations.
Innovation Solution
The light emitting element features separate anode and cathode electrodes for the light emitting part and the light receiving part on the front surface side of a semi-insulating substrate, preventing electrical crosstalk and allowing for independent operation, with a current blocking region to enhance detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If shared electrodes are used for light emitting part and light receiving part, then device complexity is reduced, but electrical crosstalk increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent divides the electrode structure into separate anode electrodes and cathode electrodes for the light emitting part and light receiving part. Specifically, the first anode electrode is connected to the light emitting part while the second anode electrode is connected to the light receiving part, and similarly for cathode electrodes. This segmentation prevents electrical crosstalk between the two functional parts while maintaining independent electrical control, thus improving signal-to-noise ratio without significantly increasing overall device complexity.
2Ease of manufacture
If shared electrodes are used for light emitting part and light receiving part, then manufacturing process is simplified, but automatic power control accuracy deteriorates
Solution Approach 1:
The patent implements separate electrode connections for the light emitting part and light receiving part, allowing independent electrical control and monitoring. The first anode electrode and first cathode electrode are dedicated to the light emitting part, while the second anode electrode and second cathode electrode are dedicated to the light receiving part. This enables accurate automatic power control by independently monitoring the light receiving part's electrical characteristics without interference from the light emitting part's operation.
3Measurement precision
If separate electrodes are used for light emitting part and light receiving part, then electrical crosstalk is reduced and signal-to-noise ratio improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functional parts into a single integrated semiconductor device structure. The light emitting part and light receiving part share the same semiconductor substrate and are formed in an integrated manner, with their respective electrodes being extended from common conductive layers. This merging approach reduces overall device complexity by avoiding separate discrete components while still maintaining separate electrode connections to prevent electrical crosstalk and improve signal-to-noise ratio.
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 reduces electrical crosstalk, improves signal-to-noise ratio, and enables accurate automatic power control by ensuring the light emitting part and light receiving part operate independently, even under high-speed differential driving.
Implementation Method 1
a light emitting part that is formed on a front surface side of a semi-insulating substrate
Implementation Method 2
a light receiving part that receives light propagating in a lateral direction through the semiconductor layer from the light emitting part
Data Source
AI summary
A light emitting element includes:a light emitting part that is formed on a front surface side of a semi-insulating substrate; anda light receiving part that is formed on the front surface side, that shares a semiconductor layer with the light emitting part, and that receives light propagating in a lateral direction through the semiconductor layer from the light emitting part, whereinanode electrodes and cathode electrodes of the light emitting part and the light receiving part are formed on the front surface side in a state in which the anode electrodes are separated from each other and the cathode electrodes are separated from each other.