Switchable Feedback Region for Optical Modulation and Monitoring
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Solution Overview
Problem
Existing light emitting devices face challenges in simultaneously enhancing modulation speed during optical data signal transmission and accurately monitoring light output, as the functions of semiconductor optical amplifiers (SOA) and monitor photodiodes (PD) are difficult to perform simultaneously, leading to impaired modulation speed and detection accuracy.
Innovation Solution
A light emitting apparatus with a feedback region that can switch between SOA and monitor PD modes, using a semiconductor layer with a light emitting region and a feedback region, where the controller sets the feedback region to SOA mode for modulation speed enhancement and to monitor mode for light amount monitoring, allowing for time-division switching to optimize both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the feedback region operates in SOA mode to enhance modulation speed, then modulation speed is improved, but light amount monitoring accuracy deteriorates
Solution Approach 1:
The feedback region dynamically switches between SOA mode and monitor mode based on operational requirements. During data transmission periods, it operates as SOA to enhance modulation speed. During idle periods, it switches to monitor mode to accurately measure light output, thus resolving the contradiction between speed enhancement and measurement accuracy.
Solution Approach 2:
The system implements periodic switching between SOA operation and monitoring operation. The feedback region alternates between enhancing modulation during active transmission and measuring light output during idle periods, allowing both functions to be optimized at different times without mutual interference.
2Measurement precision
If the feedback region operates in monitor mode to accurately monitor light output, then measurement precision is improved, but modulation speed deteriorates
Solution Approach 1:
The feedback region dynamically adjusts its operational state based on real-time requirements. When accurate light output measurement is needed, it switches to monitor mode with appropriate bias conditions. When high-speed modulation is required, it transitions to SOA mode, thus achieving both high measurement precision and high modulation speed at different operational phases.
Solution Approach 2:
The system employs periodic operation where the feedback region alternates between monitoring phases (for accurate light output measurement) and modulation phases (for high-speed data transmission). This time-division approach ensures that each function operates under optimal conditions without compromising the other.
3Adaptability or versatility
If separate SOA and monitor PD structures are used to perform both functions simultaneously, then functional versatility is improved, but device complexity increases
Solution Approach 1:
The feedback region is designed as a multi-functional component that can operate in both SOA mode and monitor mode using the same physical structure. By adjusting bias conditions and operational parameters, a single feedback region performs the functions that would traditionally require separate SOA and monitor photodiode structures, thereby reducing device complexity while maintaining functional versatility.
Solution Approach 2:
The patent merges the SOA function and monitor photodiode function into a single feedback region within the semiconductor light emitting device. This consolidation eliminates the need for separate structures and interconnections, simplifying the overall device architecture while preserving both modulation enhancement and light output monitoring capabilities through time-division operation.
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 approach enables efficient modulation speed enhancement during data signal transmission while maintaining accurate light monitoring, thereby stabilizing optical output and improving signal-to-noise ratio without compromising either function.
Implementation Method 1
a feedback region that is configured so that a feedback mode to feed back a part of light generated in the light emitting region to the light emitting region
Implementation Method 2
a monitor mode to monitor a light amount of the light generated in the light emitting region
Data Source
AI summary
A light emitting apparatus includes: a semiconductor layer including a light emitting region that generates modulation light modulated with a first signal, and a feedback region that is configured so that a feedback mode to feed back a part of light generated in the light emitting region to the light emitting region and a monitor mode to monitor a light amount of the light generated in the light emitting region are switchable; and a controller, wherein when the modulation light is generated in the light emitting region, the controller sets the feedback region to the feedback mode, and the controller switches the feedback region to the monitor mode during at least a part of a period in which there is no first signal.