PON Uplink Burst Synchronization Pattern Spectrum Distribution
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Solution Overview
Problem
In Passive Optical Network (PON) systems, the existing uplink burst data transmission uses synchronization patterns with spectrum components concentrated at high frequencies, making it difficult for receivers to detect signal peaks and leading to degraded sensitivity due to the complexity of equalizers required.
Innovation Solution
The proposed solution involves using synchronization patterns with components uniformly distributed throughout the spectrum, formed by connecting 66-bit or 32-bit unit gene blocks, which allows for the use of simpler equalizers and includes a burst delimiter, forward error correction protected data, and an end of burst delimiter, enabling efficient uplink burst data transmission in PON systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronization pattern with high frequency concentrated spectrum is used, then the OLT can perform AGC and clock recovery, but the equalizer becomes complex and sensitivity degrades
Solution Approach 1:
The patent changes the spectral parameters of the synchronization pattern by using a pseudo-random sequence with specific autocorrelation properties. This transforms the spectrum from high-frequency concentrated to uniform distribution across the frequency band, enabling simple equalizers while maintaining detection reliability
Solution Approach 2:
Instead of using a conventional high-frequency concentrated synchronization pattern, the patent inverts the approach by designing a pattern with uniform spectral distribution. This inversion resolves the contradiction by making the equalizer simple while preserving the ability to perform AGC and clock recovery through the pseudo-random sequence's autocorrelation properties
2Ease of operation
If frequent transitions are used in the synchronization pattern, then clock recovery is enabled, but peak detection fails and sensitivity degrades
Solution Approach 1:
The patent changes the transition characteristics of the synchronization pattern by using a pseudo-random sequence with controlled autocorrelation. This creates a pattern with sufficient transitions for clock recovery while avoiding excessive frequency concentration, enabling both clock recovery and peak detection with simple receivers
3Ease of operation
If conventional synchronization patterns are used, then AGC and clock recovery can be performed, but receiver sensitivity is degraded
Solution Approach 1:
The patent changes the spectral parameters of the synchronization pattern to achieve uniform distribution across the frequency band. This parameter change enables the receiver to maintain simple equalizer architecture while achieving high sensitivity through the pseudo-random sequence's favorable autocorrelation properties, which provide robust clock recovery and signal detection
Data Source
AI summary
A method for sending uplink burst data in a passive optical network (PON) system includes: sending a synchronization pattern of the uplink burst data, the synchronization pattern being of a length, which is an integer multiple of 66 bits, and being formed by connection of 66-bit unit gene blocks; sending a burst delimiter (BD) of the uplink burst data; sending a forward error correction (FEC)-protected data in the uplink burst data; and sending an end of burst (EOB) delimiter of the uplink burst data. The technical solutions in the embodiments allow the use of a less complex equalizer at the reception end of a high-speed PON system.