Adaptive Transmit Power Control in Optical Transceivers
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Solution Overview
Problem
Current optical transceivers face complications during installation and testing due to fixed transmit power settings, which can result in receiver damage and require additional characterization and equipment, especially when fiber loss is not sufficient to maintain receive power within acceptable levels.
Innovation Solution
Adaptive power setting techniques that allow optical transceivers to communicate receive power disparities through modulated characteristics of optical signals, enabling dynamic adjustment of transmit power to maintain receive power within a target range, eliminating the need for attenuators and reducing the risk of receiver damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed transmit power setting is used, then device complexity is reduced, but receiver damage risk increases when fiber loss is insufficient
Solution Approach 1:
The optical transceiver system performs self-diagnosis by monitoring receive power levels and automatically adjusting transmit power settings. The controller measures the receive power at the remote end and autonomously modulates the transmit power to maintain it within the safe operating range, eliminating the need for external intervention or complex manual configuration.
Solution Approach 2:
The system implements a feedback mechanism where the receive power level is continuously monitored and fed back to the transmitter controller. Based on this feedback, the controller dynamically adjusts the transmit power setting to ensure the receive power remains within the safe range, preventing receiver damage while adapting to varying fiber loss conditions.
2Ease of operation
If fixed transmit power setting is used, then installation simplicity is maintained, but additional equipment (optical attenuator) is required when fiber loss is low
Solution Approach 1:
The transmitter power setting is made dynamic rather than fixed. The controller automatically adjusts the transmit power level based on real-time monitoring of receive power conditions, allowing the system to adapt to different fiber loss scenarios without requiring manual intervention or additional passive components like optical attenuators.
Solution Approach 2:
The system changes the transmit power parameter dynamically based on measured receive power levels. When receive power exceeds the maximum safe level, the controller reduces the transmit power setting; when receive power is below the minimum required level, the controller increases the transmit power setting, maintaining optimal operation across varying conditions.
3Reliability
If characterize fiber before link activation, then receive power can be optimized, but productivity is reduced due to additional testing tasks
Solution Approach 1:
The system performs preliminary power adjustment actions automatically during link activation. The controller pre-configures the transmit power setting based on initial receive power measurements and iteratively adjusts it to the optimal level, eliminating the need for separate manual fiber characterization and test equipment requirements while maintaining receive power optimization.
4Power
If high transmit power setting is used, then signal strength is improved, but receiver damage risk increases when fiber loss is low
Solution Approach 1:
The system uses feedback control where the receive power level is continuously monitored and fed back to the transmitter controller. The controller adjusts the transmit power setting based on this feedback to maintain receive power within the safe operating range, preventing receiver damage while ensuring sufficient signal strength for reliable communication.
Solution Approach 2:
The transmitter power parameter is dynamically changed based on measured receive power conditions. The controller selects appropriate power levels from available settings to ensure receive power remains between the minimum and maximum safe levels, adapting to varying fiber loss conditions without requiring fixed high power settings.
Data Source
AI summary
Adaptive power setting techniques for optical transceivers are provided. Optical signals are received at a first optical transceiver device that are transmitted from a second optical transceiver device. A receive power of the optical signals received at the first optical transceiver device from the second optical transceiver device is determined. A characteristic of optical signals transmitted by the first optical transceiver device to the second optical transceiver device is modulated to indicate to the second optical transceiver device a disparity of the receive power with respect to a target receive power level at the first optical transceiver device. Conversely, the first optical transceiver device adjusts a power level of optical signals transmitted by the first optical transceiver device to the second optical transceiver device based on a characteristic of the optical signals received at the first optical transceiver device.