Optical Phased Array Complementary Amplifier Switching
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Solution Overview
Problem
The existing optical phased array (OPA) devices for LiDAR technology face challenges in power reduction due to multi-channel dispersion, especially with silicon photonics light sources, which limits the number of channels that can be effectively driven without significant power loss.
Innovation Solution
The integration of complementary amplifiers and switches within the OPA device allows for dynamic replacement of amplifiers when performance degrades, maintaining optimal power distribution across multiple channels through a waveguide-based structure, thereby enhancing the driving probability of the OPA device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a 32-channel method using 1×2 splitters of 5 levels is used to distribute light from one light source, then the number of channels is increased, but the power of light reaching each channel is reduced to 1/32 of the original power
Solution Approach 1:
The system segments the amplification function by deploying multiple SOAs (semiconductor optical amplifiers) distributed across different channels and levels of the optical splitter tree. Each SOA independently amplifies light in its specific optical path, preventing the power reduction that would otherwise occur with multi-channel dispersion. This segmentation allows the system to maintain high channel count (32 channels) while compensating for power loss through localized amplification at strategic points in the optical distribution network.
2Power
If semiconductor optical amplifiers (SOA) are used to supplement power in multi-channel dispersion, then the power of each channel is maintained, but the device complexity increases due to the need for multiple amplifiers and monitoring mechanisms
Solution Approach 1:
The system implements self-service through automatic monitoring and replacement mechanisms. Monitoring photodiodes continuously detect the performance of each SOA, and when an SOA's performance degrades or fails, the system automatically replaces it with a standby SOA without requiring manual intervention. This self-service approach maintains high power levels across all channels while reducing the operational complexity of managing multiple amplifiers, as the system autonomously handles fault detection and component replacement.
Solution Approach 2:
The system changes the operational parameters by introducing complementary amplifiers that can replace degraded SOAs. Instead of manually managing the complexity of multiple amplifiers, the system uses parameter changes in the form of automatic gain control and performance threshold monitoring. When an SOA's output power or efficiency drops below a predetermined threshold, the monitoring photodiode triggers a replacement sequence, changing the operational state from manual amplifier management to automated parameter-based replacement.
3Power
If amplifiers are used to maintain power in each channel, then the driving capability is improved, but the reliability decreases due to potential amplifier degradation and failure
Solution Approach 1:
The system applies beforehand cushioning by implementing redundant standby SOAs for each active amplifier. These complementary amplifiers remain in standby mode, ready to immediately replace any degraded or failed SOA. The monitoring photodiodes continuously watch for performance degradation, and when threshold violations occur, the standby amplifiers automatically take over. This prior cushioning through redundancy ensures that power distribution capability is maintained while eliminating the reliability risk associated with single-point amplifier failures.
Data Source
AI summary
An optical phased array device according to at least one embodiment includes a light distribution unit configured to branch a traveling path of light, input through an input terminal, at least twice, and to direct distributed pieces of sub-light to a plurality of output terminals; at least one light modulator configured to form a plurality of channels by modulating phases of the pieces of sub-light; at least one first amplifier in an optical path between the input terminal and the at least one light modulator, the at least one first amplifier configured to amplify at least a piece of sub-light; at least one first complementary amplifier configured to replace the at least one first amplifier; and a switch configured to switch the first complementary amplifier in or out of the optical path between the input and the at least one light modulator.