PON Equalizer Coefficient Switching for Noise Reduction
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Solution Overview
Problem
Current passive optical network (PON) systems face challenges in efficiently handling multiple data rates, leading to excess high-frequency noise and sensitivity degradation when switching between 50G and lower rates, particularly during fall-back protection modes, as existing equalization methods are sub-optimal for 25G and 12.5G signals.
Innovation Solution
Implementing a dynamic switching mechanism for equalizer coefficients based on determined signal rates, allowing for the selection of pre-determined coefficient sets specific to each rate, enabling efficient equalization and minimizing noise enhancement during rate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 50G receiver chain is used for receiving lower-rate bursts (25G or 12.5G), then the receiver can handle multiple rates, but excess high-frequency noise is captured leading to sensitivity degradation
Solution Approach 1:
The patent implements dynamic switching of equalizer coefficients based on the detected signal rate. The receiver transitions from a static 50G equalizer configuration to a dynamic system that adapts its equalizer coefficients according to whether it is receiving 50G, 25G, or 12.5G bursts, thereby optimizing performance for each rate while maintaining multi-rate capability
Solution Approach 2:
The patent changes the equalizer coefficients parameter based on the signal rate. Different coefficient sets are applied for 50G versus 25G/12.5G reception, transforming the equalizer from a fixed parameter system to one that adjusts its characteristics to match the incoming signal rate, thus reducing unnecessary high-frequency noise processing
2Reliability
If the equalizer is re-trained for each rate change, then optimal performance is achieved, but excessive training time is required for 25G and 12.5G rates
Solution Approach 1:
The patent pre-configures multiple equalizer coefficient sets corresponding to different rates (50G, 25G, 12.5G) before actual reception occurs. When a rate change is detected, the system simply switches between pre-computed coefficient sets rather than performing time-consuming re-training, thereby maintaining optimal performance while eliminating the time loss associated with re-training
3Adaptability or versatility
If a 50G equalizer is used for 25G signalling, then the equalizer can process the signal, but noise enhancement occurs due to boosting frequencies higher than required for 25G reception
Solution Approach 1:
The patent applies different equalizer coefficient characteristics to different signal rates. The 25G and 12.5G coefficient sets are specifically designed to match the frequency requirements of lower-rate signals, preventing the noise enhancement that would occur with a generic 50G equalizer while maintaining compatibility across all rates
Data Source
AI summary
The present invention discloses an apparatus, comprising means for: determining a rate for a received signal in a passive optical network, PON; selecting, based on the determined rate, a set of coefficients for an equalizer from a plurality of predetermined sets of coefficients for the equalizer, wherein, the plurality of predetermined sets respectively corresponds to a plurality of rates; equalizing the received signal with the equalizer based on the selected set of coefficients, obtaining an equalized signal.