Burst-mode receiver dynamic processing rate adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Burst-mode receivers in passive optical networks face inefficiencies in receiving and decoding optical burst signals with varying symbol rates, leading to energy inefficiency and potential data loss due to oversampling and incorrect decoding.
Innovation Solution
An optical line terminal (OLT) with a burst-mode receiver that adjusts its digital signal processing circuitries' processing rates based on the symbol rate of incoming optical burst signals, using configurable processing rates, clock frequency adjustments, and latency compensators to optimize energy efficiency and prevent data alterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the digital signal processing circuitries operate at a fixed high processing rate to handle the highest symbol rate, then the receiver can decode all symbol rates, but energy is wasted due to oversampling of lower symbol rates
Solution Approach 1:
The patent implements dynamic adjustment of the processing rate of digital signal processing circuitries based on the detected symbol rate of incoming optical burst signals. The processing rate is changed during intervals between valuable symbols to match the actual symbol rate, enabling the system to adapt its energy consumption to the actual workload while maintaining decoding capability for multiple symbol rates.
Solution Approach 2:
The patent changes the operating parameter (processing rate) of the digital signal processing circuitries according to the detected symbol rate. By adjusting the processing rate to match the actual symbol rate rather than operating at a fixed high rate, the system reduces energy consumption while maintaining the ability to handle multiple symbol rates through dynamic parameter adaptation.
2Use of energy by moving object
If the processing rate is adjusted during reception of valuable symbols, then the receiver can optimize for the current symbol rate, but data loss occurs due to incorrect decoding during the adjustment transition
Solution Approach 1:
The patent performs the processing rate adjustment in advance, during the interval between the reception of valuable symbols in the previous optical burst signal and the next optical burst signal. By completing the adjustment before the next valuable symbols arrive, the system ensures that the processing rate is already optimized when decoding begins, preventing data loss while maintaining energy efficiency.
Solution Approach 2:
The patent utilizes the guard interval or idle period between consecutive optical burst signals to perform the processing rate adjustment. By skipping the adjustment operation during the actual symbol reception and confining it to the interval between bursts, the system avoids disrupting the decoding of valuable symbols while still achieving optimal processing rates.
3Use of energy by moving object
If the processing rate is adjusted between optical burst signals, then energy efficiency is improved, but latency increases due to the reconfiguration time
Solution Approach 1:
The patent maintains continuous useful action by performing processing rate adjustments during the natural intervals between optical burst signals, rather than interrupting the reception of valuable symbols. This approach ensures that the reconfiguration time does not add to the overall system latency, as it occurs during already-existing idle periods when no data transmission is taking place.
Data Source
AI summary
Example embodiments describe an optical line terminal, OLT, configured to communicate in a passive optical network with one or more optical network units, ONUs. Optical burst signals transmitted by the one or more ONUs have respective symbol rates. The optical line terminal includes a burst-mode receiver configured to decode an optical burst signal from an ONU to a decoded output signal by one or more digital signal processing circuitries that process a signal at respective configurable processing rates. The optical line terminal is configured to perform obtaining the symbol rate of a next optical burst signal; and adjusting, during an interval between reception of valuable symbols within a previous optical burst signal and reception of valuable symbols within the next optical burst signal, the configurable processing rate of one or more digital signal processing circuitries based on the symbol rate of the next optical burst signal.