Optical Receiver Phase Compensation Using Digital Sub-Carriers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current WDM systems face challenges in accurately and efficiently correcting phase errors in received signals, especially when using multiple digital sub-carriers, due to high computational complexity and ambiguity in phase estimation, which affects data transmission accuracy.
Innovation Solution
The implementation of a digital signal processor in the optical receiver that determines frequency and phase compensation values to modify input signals, generating a phase adjustment signal for accurate carrier recovery, reducing computational complexity by using a limited range of test phases and averaging error values across sub-carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase estimation is performed using multiple digital sub-carriers in WDM systems, then data transmission accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent divides the phase estimation task across multiple digital sub-carriers, where each sub-carrier contributes to the overall phase estimation. By segmenting the estimation process and utilizing multiple sub-carriers in parallel, the system achieves more accurate phase estimation without requiring a single complex estimation algorithm, thus managing computational complexity through distributed processing.
Solution Approach 2:
The patent combines phase estimation results from multiple digital sub-carriers to achieve more accurate overall phase estimation. By merging the information from multiple sub-carriers, the system improves measurement precision while the combined estimation process is performed through efficient digital signal processing that manages computational load.
2Measurement precision
If phase estimation is performed using multiple digital sub-carriers, then data transmission accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary actions by pre-processing the signals from multiple sub-carriers and preparing estimation data in advance. This allows the phase estimation to be performed more efficiently, reducing the time required for the actual estimation process while maintaining high accuracy through the pre-prepared data from multiple sub-carriers.
Solution Approach 2:
The patent maintains continuous useful action by continuously estimating phase from multiple sub-carriers in an ongoing process. Rather than performing discrete, time-consuming estimations, the system continuously processes phase information from all sub-carriers simultaneously, improving accuracy while minimizing processing time through parallel and continuous operation.
3Manufacturing precision
If frequency and phase compensation values are determined for each sub-carrier, then signal accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal approach where a single digital signal processor handles frequency and phase compensation for all sub-carriers. Rather than requiring separate specialized processors for each sub-carrier, one multi-functional processor performs the compensation tasks across all sub-carriers, improving signal accuracy while managing device complexity through software-based universal processing.
Solution Approach 2:
The patent changes parameters dynamically by determining frequency and phase compensation values as adjustable parameters that can be optimized for each sub-carrier's specific conditions. This allows high signal accuracy through parameter optimization while the parameter-based approach simplifies the processing architecture compared to hardware-specific solutions for each sub-carrier.
Data Source
AI summary
An optical receiver may receive input signals carried by respective sub-carriers. The optical receiver may determine, based on the input signals, a compensation value to be used to modify an input signal. The optical receiver may use the compensation value to adjust the input signal to form a modified input signal. The compensation value may be used to modify a frequency or a phase of the input signal. The optical receiver may determine, based on the modified input signal, a phase estimate value that represents an estimated phase associated with the input signal. The optical receiver may combine the compensation value and the phase estimate value to form a phase adjustment signal, may combine the input signal and the phase adjustment signal to form an output signal, and may output the output signal.