Optical Network Synchronization Patterns for Adaptive PON Receivers
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Solution Overview
Problem
Existing passive optical networks (PONs) suffer from sub-optimum synchronization operations due to fixed synchronization structures that do not account for varying receiver implementations and operational modes, leading to inefficient data transmission and potential data errors.
Innovation Solution
Implement a method and apparatus for dynamically configurable synchronization parameters and patterns in PONs, allowing for optimized AGC, CDR, and SBD patterns based on the specific OLT receiver implementation and operational mode, using protocol data messages to adjust synchronization phases and burst preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed synchronization structures are used in PONs, then device complexity is reduced and ease of manufacture is improved, but data transmission efficiency deteriorates and error rates increase due to inability to adapt to varying receiver implementations and operational modes
Solution Approach 1:
The patent implements dynamic synchronization structures where the OLT transmits different synchronization patterns (AGC, CDR, SBD) based on the operational mode and receiver implementation. The system transitions from fixed to adaptive synchronization configuration, allowing optimization of data transmission efficiency while maintaining ease of manufacture through standardized protocol messages
Solution Approach 2:
The patent changes synchronization parameters dynamically by transmitting configuration messages that specify different pattern types, lengths, and positions based on operational requirements. This allows the system to adapt synchronization characteristics to match specific receiver implementations and operational modes, resolving the contradiction between fixed structure simplicity and adaptive performance
2Device complexity
If fixed synchronization structures are used in PONs, then device complexity is reduced, but reliability deteriorates due to potential data errors from mismatched synchronization patterns
Solution Approach 1:
The patent implements a feedback mechanism where the OLT transmits synchronization configuration messages to ONUs, and the system adapts synchronization patterns based on operational mode and receiver characteristics. This feedback loop ensures reliable data transmission by matching synchronization patterns to specific receiver implementations without significantly increasing device complexity
Solution Approach 2:
The patent applies preliminary action by pre-configuring synchronization patterns and transmitting configuration messages before actual data transmission begins. The OLT prepares and sends synchronization parameter information in advance, ensuring that the correct patterns are established before data transfer, thereby improving reliability without adding complex real-time adjustment mechanisms
3Productivity
If adaptive synchronization parameters are implemented, then data transmission efficiency is improved and errors are reduced, but device complexity increases due to dynamic configuration requirements
Solution Approach 1:
The patent applies universality by designing a multi-functional synchronization configuration system that can handle multiple operational modes (discovery, normal, test) and different receiver implementations through a unified protocol message framework. This universal approach enables adaptive synchronization without proportionally increasing device complexity, as the same infrastructure serves multiple functions
4Reliability
If adaptive synchronization parameters are implemented, then reliability is improved by reducing data errors, but device complexity increases due to dynamic configuration requirements
Solution Approach 1:
The patent changes synchronization parameters dynamically through standardized protocol messages that convey pattern type, length, and position information. This parameter-based approach improves reliability by adapting to specific receiver implementations while controlling device complexity through systematic parameter management rather than complex structural changes
Data Source
AI summary
Apparatus and methods for discovery, synchronization and operation of network components. In one embodiment, the network comprises a passive optical network (PON), and the components being synchronized include an enhanced OLT (eOLT) and one or more enhanced ONUs (eONUs). The eOLT is configured in one variant to utilize control protocol messaging (such as those used in the MPCP or Multi Point Control Protocol) to communicate particular synchronization parameters and durations to the eONU(s), whether individually or via multicast/broadcast. The synchronization parameter and durations are selected to optimize discovery and synchronization of the eONU(s) with the eOLT, and also optimize (subsequent) normal operation, in one implementation through selection of synchronization patterns which enable most efficient AGC determination, clock recovery (CDR), SBD, and EBD identification.