Coherent Optical Transceiver OSNR Prediction via BER and ROP
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Solution Overview
Problem
Current methods for monitoring the performance of coherent optical receivers are expensive and complex, and they do not effectively handle varying baud rates in optical communication systems, which limits the transmission distance due to noise accumulation.
Innovation Solution
An optical transceiver with a photo diode and processor that measures receiver optical power and bit error rate at multiple baud rates, allowing for the estimation of optical signal noise ratio (OSNR) and selection of optimal data transmission routes based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If optical amplifiers are used to compensate for attenuation, then transmission distance is extended, but noise is added which limits the transmission distance
Solution Approach 1:
The patent replaces direct physical measurement of OSNR with a computational approach using machine learning models that predict OSNR from BER and ROP measurements, eliminating the need for complex optical filtering and direct noise measurement hardware
Solution Approach 2:
The patent introduces BER and ROP as intermediary measurements that can be obtained through existing transceiver components, using these as proxies to infer OSNR without direct measurement of the noisy optical signal
2Measurement precision
If known systems are used to monitor the performance of a coherent optical receiver, then OSNR can be measured, but the systems are expensive and complex
Solution Approach 1:
The patent creates a virtual model of OSNR behavior through machine learning training, where the model learns the relationship between BER, ROP, and OSNR from training data, then uses this copied knowledge to predict OSNR without physical replication of complex measurement hardware
Solution Approach 2:
The patent makes existing transceiver components (photo diode and processor) perform multiple functions: they measure both ROP and BER, and the processor additionally performs OSNR prediction, eliminating the need for dedicated OSNR measurement hardware
3Ease of operation
If performance monitoring is implemented at fixed baud rates, then measurements are simplified, but the system cannot handle varying baud rates in optical communication systems
Solution Approach 1:
The patent makes the monitoring system dynamic by enabling the processor to perform OSNR predictions at multiple different baud rates, allowing the system to adapt to varying transmission conditions while maintaining the same measurement methodology
Solution Approach 2:
The patent changes the operating parameter of baud rate from fixed to variable, allowing the processor to adjust the prediction calculations to match the actual baud rate being used in the optical communication system
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 simplifies performance monitoring, reduces costs, and enables efficient data transmission by predicting OSNR performance across various baud rates, thereby extending transmission distances and improving network reliability.
Implementation Method 1
a photo diode and a processor configured to be operatively coupled to the photo diode. The photo diode is configured to measure multiple receiver optical power (ROP) values
Data Source
AI summary
In some embodiments, an apparatus includes an optical transceiver having a photo diode and a processor configured to be operatively coupled to the photo diode. The photo diode is configured to measure a set of receiver optical power (ROP) values at a set of baud rate values. The processor is configured to measure a set of bit error rate (BER) values of a digital modulated signal at the set of baud rate values. The processor is configured to determine an estimated optical signal noise ratio (OSNR) value at a baud rate value from the set of baud rate values based on the set of ROP values and the set of BER values. The processor is configured to send a signal indicating the estimated OSNR value at the baud rate value such that a planned route is selected to send data signals based on the estimated OSNR value.