Optical Reception Device With Pre-Detection Signal Adjustment
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Solution Overview
Problem
The application of probabilistic constellation shaping (PCS) in coherent optical transmitters leads to reduced signal intensity and detection sensitivity in optical receivers, making accurate demodulation of digital signals challenging due to decreased signal power and increased noise resistance requirements.
Innovation Solution
An optical reception device with a compensation circuit that adjusts signal intensity before sampling phase detection, using a level adjustment unit to increase signal power and improve phase detection sensitivity, thereby enhancing the accuracy of sampling phase compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If probabilistic constellation shaping (PCS) is applied in coherent optical transmitters, then spectral efficiency is improved, but signal intensity and detection sensitivity are reduced
Solution Approach 1:
The invention applies preliminary action by adjusting the signal intensity before sampling phase detection. The level adjustment unit increases the signal power of the digital signal prior to the detection process, ensuring that the reduced signal intensity from PCS application does not degrade the detection sensitivity. This preparatory intensity adjustment enables accurate phase detection despite the lower signal power inherent in PCS-modulated signals.
Solution Approach 2:
The invention employs parameter changes by dynamically adjusting the signal intensity parameter through the level adjustment unit. By changing the amplitude parameter of the digital signal before detection, the system compensates for the intensity reduction caused by PCS, thereby maintaining adequate detection sensitivity while preserving the spectral efficiency benefits of PCS.
2Use of energy by moving object
If signal intensity is reduced due to PCS application, then power consumption is decreased, but demodulation accuracy deteriorates
Solution Approach 1:
The level adjustment unit performs preliminary action by boosting the signal intensity before the sampling phase detection process. This ensures that even though the overall signal power is reduced to save energy, the critical detection stage receives sufficiently amplified signals to maintain high demodulation accuracy.
Solution Approach 2:
The system dynamically changes the signal intensity parameter at the detection stage through the level adjustment unit. This selective parameter adjustment allows the system to operate with lower overall power consumption while ensuring that the detection process receives signals with adequate intensity for accurate demodulation.
3Loss of energy
If signal power is decreased to improve energy efficiency, then noise resistance requirements increase, but detection precision is compromised
Solution Approach 1:
The invention applies preliminary action by pre-amplifying the digital signal through the level adjustment unit before it undergoes sampling phase detection. This ensures that the reduced signal power from energy-efficient operation does not compromise the detection precision, as the signal is boosted to appropriate levels right before the critical measurement process.
Solution Approach 2:
The system employs parameter changes by adjusting the amplitude parameter of the digital signal through the level adjustment unit. This dynamic parameter adjustment allows the system to maintain energy efficiency through lower overall signal power while ensuring that the detection process operates with sufficient signal intensity for precise phase measurement.
Data Source
AI summary
An optical reception device includes: a reception circuit that performs digital coherent reception of an optical signal to which a probabilistic constellation shaping (PCS) is applied; a conversion circuit that samples an electric field signal in an analog format that represents an optical electric field component of the optical signal and converts the electric field signal into a digital signal in a digital format; a detection circuit that detects a sampling phase of the digital signal and generates sampling phase information that corresponds to the sampling phase; a compensation circuit that compensates for the sampling phase of the digital signal based on the sampling phase information; and an adjustment circuit that adjusts signal intensity of the digital signal before the sampling phase information is generated.