PON Architecture Flexible Channel Binding
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Solution Overview
Problem
Existing passive optical network (PON) systems face challenges in efficiently managing multiple wavelengths and bandwidth allocation, leading to suboptimal use of bandwidth and flexibility in supporting different numbers of wavelengths by optical network units (ONUs) under the same optical distribution network (ODN).
Innovation Solution
The PON architecture and method enable an optical line terminal (OLT) to support multiple channels and ONUs to dynamically adjust channel allocation, prioritizing data transmission on channels with the earliest transmittable start time and ensuring similar or synchronized end times, allowing for flexible channel binding and full bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If OLT uses multi-wavelength optical modules to configure four or more uplink and downlink wavelengths, then bandwidth capacity is improved, but device complexity increases
Solution Approach 1:
The ONU is designed to support multiple wavelengths and channel configurations universally. It can adapt to different wavelength assignments (e.g., 4 wavelengths, 8 wavelengths, or 16 wavelengths) and different channel bonding modes without requiring hardware changes, making a single ONU type capable of serving multiple wavelength scenarios.
Solution Approach 2:
The ONU dynamically adjusts its operational parameters based on OLT configuration. It can flexibly change the number of active wavelengths, channel assignments, and bonding configurations according to network conditions and service requirements, transitioning between different operational states without physical reconfiguration.
2Adaptability or versatility
If ONU supports multiple wavelengths with flexible channel allocation, then adaptability is improved, but device complexity increases
Solution Approach 1:
The ONU changes its operational parameters (wavelength assignments, channel counts, bonding configurations) based on configuration messages from the OLT. By adjusting software-controlled parameters rather than hardware configurations, the ONU achieves high adaptability while keeping the physical device structure relatively simple and standardized.
3Productivity
If channel bonding is implemented across multiple wavelengths, then bandwidth utilization is improved, but transmission control difficulty increases
Solution Approach 1:
The system implements feedback mechanisms where the ONU reports its operational status, channel availability, and transmission performance to the OLT. The OLT uses this feedback to dynamically adjust wavelength assignments, channel bonding configurations, and power allocation, creating a closed-loop control system that simplifies multi-wavelength coordination.
Solution Approach 2:
The OLT performs preliminary configuration and planning before actual data transmission. It pre-assigns wavelengths, configures channel bonding parameters, and establishes transmission schedules based on predicted traffic patterns and service requirements, reducing the complexity of real-time control during actual transmission.
Data Source
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AI summary
A PON architecture, a method for realizing data transmission with the PON architecture and an optical network device are provided. The PON architecture includes an optical line terminal (OLT) supporting multiple channels, and one or more optical network units (ONUs) supporting one or more channels under a same optical distribution network (ODN). The OLT/ONU is configured to acquire the number of channels and/or corresponding channels supported for transmitting data and transmittable states of the supported channels, distribute the data to be transmitted to one or more supported channels for transmitting, the data is preferentially transmitted on a channel with an earliest transmittable start time point, and transmission end time points of channels for transmitting the data are similar or data transmissions end at a transmittable end time point. The ONU/OLT is configured to receive data on channels supported by ONU/OLT itself and reassemble the data accordingly based on transmission rules. By schemes provided by embodiments of the present invention, the OLT supporting multiple wavelengths can control ONU supporting different numbers of wavelengths and different wavelengths, the flexible binding of channels can be realized, and the bandwidth can be fully utilized.