Expedited Acquisition Engine for Coherent Optical Receiver Recovery
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Solution Overview
Problem
Coherent optical systems require extended signal acquisition time for fault scenarios and signal reacquisition, which is longer than industry benchmarks and poses challenges in maintaining robust signal recovery.
Innovation Solution
An expedited acquisition engine in coherent optical receivers that includes a reference clock recovery, compensators for chromatic and polarization dispersion, and a memory-oriented architecture to store pre-calculated dispersion maps and equalizer coefficients, allowing for rapid signal reacquisition using pre-stored operational data without full reacquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent detection is used to improve signal sensitivity and data rate, then receiver sensitivity is improved, but signal acquisition time increases significantly
Solution Approach 1:
The patent pre-calculates and stores dispersion maps and equalizer coefficients in memory before they are needed. When signal reacquisition is required, these pre-computed values are immediately loaded and applied, eliminating the need to perform complex calculations during the recovery process. This preliminary preparation of correction parameters dramatically reduces the time required to restore coherent detection after faults or interruptions.
Solution Approach 2:
The patent creates and stores copies of operational data including dispersion maps and equalizer coefficients in memory. These copied data structures can be rapidly retrieved and applied during signal reacquisition without requiring recalculation. The system maintains multiple copies of critical parameters that can be instantly deployed to restore signal processing, thereby reducing acquisition time while preserving the sensitivity benefits of coherent detection.
2Reliability
If full signal reacquisition is performed to ensure robust recovery, then reliability is improved, but recovery time increases beyond industry benchmarks
Solution Approach 1:
The system pre-computes and stores dispersion maps and equalizer coefficients that are necessary for signal recovery. When a fault occurs, these pre-prepared parameters are immediately applied rather than calculating them from scratch, enabling fast recovery that meets industry benchmarks while maintaining robust signal reacquisition through the use of proven correction parameters.
Solution Approach 2:
The patent replaces the mechanical process of real-time calculation and iteration during signal reacquisition with a memory-based retrieval and application system. Instead of performing complex computational mechanics during recovery, the system substitutes this with electronic memory access and parameter loading, which is significantly faster while maintaining the reliability of full reacquisition through the use of pre-validated correction data.
3Productivity
If complex digital processing is implemented to utilize wave aspects of light, then data rate is improved, but device complexity increases
Solution Approach 1:
The patent performs complex digital processing tasks such as dispersion compensation and equalization in advance, storing the results as pre-calculated maps and coefficients. This shifts the computational burden from the real-time processing path to an offline preparation phase, reducing the complexity of the active signal processing chain while maintaining high data rates through the use of pre-computed correction parameters.
Solution Approach 2:
The system creates copied representations of complex processing results in memory (dispersion maps, equalizer coefficients). These copies allow the system to bypass repetitive complex calculations during normal operation and fault recovery, using stored data structures instead. This reduces the operational complexity of the digital processing system while preserving the high data rate capabilities enabled by coherent detection of wave aspects.
Data Source
AI summary
Short-term optical recovery systems and methods in coherent optical receivers minimize recovery time for fault scenarios and signal reacquisition while maintaining robust signal acquisition. The short-term optical recovery systems and methods include special techniques and algorithms to minimize recovery time, making coherent systems similar in time as conventional direct detection recovery. The short-term optical recovery systems and methods include an expedited acquisition engine that includes a reference clock recovery, a compensator to remove chromatic dispersion, a burst framer, and a compensator to remove polarization dispersion. Importantly, the expedited acquisition engine uses a memory oriented architecture to allow some properties of the acquisition engine to be stored during initial acquisition and, hence, later on be deployed in any fault scenario to expedite further recovery of a signal.