Optical Receiver Burst Sampling with Preamble Phase Alignment
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Solution Overview
Problem
In high-speed PON systems, sampling phase deviations occur due to inconsistent phases between burst packet signals and the local sampling clock, leading to reduced signal-to-noise ratios and increased bit errors.
Innovation Solution
A signal sampling method and apparatus that involves sampling a burst signal at a first frequency, sampling a preamble signal at a second frequency, determining the phase difference between the burst signal and the local sampling clock, and interpolating the sampling signal to align with the target sampling phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ADC samples the burst packet signal according to the local clock phase, then the sampling process is simple and straightforward, but the sampling phase deviates because the burst packet signal phase is inconsistent with the local sampling clock phase, resulting in reduced signal-to-noise ratio and increased bit errors
Solution Approach 1:
The patent applies preliminary action by estimating the phase offset of the incoming burst packet signal relative to the local sampling clock before the actual sampling process. This phase offset estimation is performed in advance using reference signals or training sequences, allowing the system to pre-adjust the sampling timing or apply digital correction to compensate for the phase misalignment, thereby maintaining both sampling simplicity and high signal-to-noise ratio
Solution Approach 2:
The patent changes the timing parameter of the sampling process based on the estimated phase offset. By adjusting the sampling instant or the local clock phase dynamically according to the detected phase difference, the system aligns the sampling points with the optimal signal positions, thus improving the signal-to-noise ratio without complicating the fundamental sampling mechanism
2Device complexity
If the ADC samples the burst packet signal according to the local clock phase, then the hardware configuration remains simple, but the sampling occurs at non-optimal symbol positions due to phase inconsistency, leading to signal energy loss and increased bit errors
Solution Approach 1:
The patent introduces a phase offset estimation and compensation mechanism as an intermediary between the local sampling clock and the ADC sampling process. This intermediary component analyzes the phase relationship and generates correction information that adjusts the sampling timing, thereby achieving precise sampling position alignment without requiring complex hardware reconfiguration
Solution Approach 2:
The system performs preliminary phase offset estimation using reference signals before the main data sampling. This advance measurement allows the system to pre-calculate the required timing adjustment, ensuring that the actual sampling occurs at the optimal symbol position while keeping the hardware configuration simple
3Adaptability or versatility
If different ONUs transmit burst packets with different transmission distances and link damages, then the system supports multiple users with different characteristics, but each burst packet arrives with different delays and phase differences, making unified sampling difficult
Solution Approach 1:
The patent applies local quality by implementing individualized phase offset estimation and compensation for each ONU's burst packet. Instead of using a unified sampling timing for all users, the system independently determines the phase offset for each incoming burst packet and applies specific correction to each, thereby maintaining sampling synchronization reliability while supporting multiple users with different transmission characteristics
4Productivity
If the sampling phase deviates from the optimal symbol position, then the sampling process can be performed continuously without interruption, but the sampled data loses signal energy and experiences increased bit errors
Solution Approach 1:
The patent implements feedback by continuously monitoring the phase offset of incoming burst packets and using this information to dynamically adjust the sampling timing or apply digital correction. The system estimates the phase offset from reference signals, applies compensation, and maintains optimal sampling alignment throughout operation, ensuring both continuous sampling and high signal quality
Data Source
AI summary
The present disclosure provides a signal sampling method and apparatus, and an optical receiver. The method includes sampling a burst signal that is received according to a first sampling frequency to obtain a first sampling signal; sampling a preamble signal in the first sampling signal according to a second sampling frequency to obtain a second sampling signal; determining a phase difference between the burst signal and a local sampling clock corresponding to the first sampling frequency according to the second sampling signal; and interpolating the first sampling signal according to the phase difference to obtain a target sampling signal.