Parallel Phase Compensation for High-Speed Optical Signals

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In ultra-high speed optical communication systems exceeding 40 Gbps, phase excursion and carrier wave frequency excursion compensation processing using parallel processing leads to deterioration in transmission characteristics, particularly due to increased bit error ratios and higher optical SNR requirements, which affect data demodulation and transmission distance.

Innovation Solution

A phase excursion/carrier wave frequency excursion compensation device and method employing a signal dividing unit, preprocessing and post-processing compensation circuits, a signal combination unit, a correction amount calculation unit, and a signal correction unit, which divide input signals into frames and calculate phase compensation amounts to correct the phase of the rearranged signals, allowing for fast compensation without deteriorating transmission characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If parallel processing is used for phase excursion and carrier wave frequency excursion compensation, then processing speed is improved, but transmission characteristics deteriorate due to increased bit error ratios and higher optical SNR requirements

Engineering Contradiction:

Improvecompensation processing speedVSAvoidtransmission characteristics

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent divides the input signal into multiple frames and distributes them to different compensation circuits for parallel processing. Each circuit processes a specific frame independently, enabling fast parallel computation while maintaining accurate phase compensation results through proper synchronization and combination of the distributed frame processing outcomes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a feedback mechanism where the correction amount calculation unit computes phase correction amounts based on the compensated signals, and these correction amounts are fed back to correct the phase of rearranged signals. This closed-loop feedback ensures that even with parallel processing, the transmission characteristics are maintained by continuously adjusting and refining the phase compensation accuracy

Inventive Principle:

Principle #23Feedback

2Loss of time

If parallel processing is used for phase excursion and carrier wave frequency excursion compensation, then processing time is reduced, but bit error ratio increases

Engineering Contradiction:

Improvecompensation processing timeVSAvoidbit error ratio

Core Design Contradiction:

Loss of timeVSLoss of information

Solution Approach 1:

The patent segments the compensation processing into multiple parallel paths, each handling a specific frame. By distributing frames to different compensation circuits that operate simultaneously, the overall processing time is reduced while each individual path maintains accurate phase compensation, preventing bit errors

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces sequential mechanical processing with parallel computational processing. Multiple compensation circuits compute phase compensation for different frames simultaneously using digital signal processing, substituting the time-consuming sequential approach with parallel computation that achieves both speed and accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If parallel processing is used for phase excursion and carrier wave frequency excursion compensation, then processing efficiency is improved, but optical SNR requirements increase

Engineering Contradiction:

Improvecompensation processing efficiencyVSAvoidoptical SNR requirements

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent segments the input signal into multiple frames that are processed in parallel by different compensation circuits. This segmentation enables efficient parallel processing while each circuit operates on a manageable frame size, maintaining optimal signal-to-noise ratio performance without requiring excessive optical power

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges the results from multiple parallel compensation circuits through the signal combination unit. By properly combining the compensated frames and applying correction amounts calculated from the merged output, the system achieves high processing efficiency while maintaining the optical SNR performance through coherent integration of the parallel processing results

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8693600B2Phase excursion/carrier wave frequency excursion compensation device and method

Publication Date: 2014.04.08 NEC CORP

AI summary

A phase excursion/carrier wave frequency excursion compensation device has a signal dividing unit, a preprocessing compensation circuit, post-processing compensation circuits, a signal combination unit, a correction amount calculation unit, and a signal correction unit. The preprocessing compensation circuit and the post-processing compensation circuits calculate a phase compensation amount with respect to the input signal, and output the phase compensation amount, and a compensation circuit output signal such that the input signal can be compensated accordingly. The signal combination unit acquires compensation circuit output signals from the post-processing compensation circuits and, based on order of input to the signal dividing unit, outputs rearranged signals. The correction amount calculation unit calculates a correction amount based on the phase compensation amount acquired from the preprocessing compensation circuit and the post-processing compensation circuits, and a signal correction unit corrects the phase of the rearranged signals using the correction amount.