Optical Network Unit Registration via Wavelength Segmentation
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Solution Overview
Problem
Existing PON systems face challenges in efficiently registering optical network units (ONUs) without introducing latency, particularly in scenarios where multiple work types and wavelengths are involved.
Innovation Solution
The method involves determining the current work type of the ONU based on the supported work types and a downlink message from the Optical Line Terminal (OLT), allowing for seamless registration without latency windows on low-latency service wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the ONU uses the low-latency service uplink wavelength for registration, then the latency caused by the quiet window is eliminated, but the OLT cannot correctly receive the registration information from the ONU
Solution Approach 1:
The patent segments the uplink transmission into two distinct wavelengths: one dedicated for registration (non-low-latency service uplink wavelength) and another for low-latency services. This segmentation allows the OLT to correctly receive registration information without interference from quiet windows, while still enabling low-latency service transmission on the service wavelength after registration completes.
Solution Approach 2:
The patent introduces a wavelength conversion mechanism as an intermediary. The ONU converts its registration signal from the low-latency service uplink wavelength to a dedicated registration wavelength, allowing the OLT to receive registration information reliably without being affected by the quiet window period that occurs on service wavelengths.
2Loss of time
If the ONU works in low-latency mode using service wavelength for registration, then registration latency is reduced, but it affects other low-latency ONUs sharing the same wavelength
Solution Approach 1:
The patent segments the uplink spectrum into dedicated registration wavelength and service wavelength. By assigning registration traffic to a separate wavelength resource, the system eliminates interference between registration processes of different ONUs and ensures that low-latency service wavelengths remain dedicated to service traffic, preventing any harmful effects on other ONUs.
3Loss of time
If the ONU uses a different uplink wavelength for registration, then registration can occur without quiet window latency, but the device complexity increases due to wavelength switching requirements
Solution Approach 1:
The patent introduces a wavelength conversion mechanism as an intermediary component in the ONU. This converter enables the ONU to switch between using the service wavelength for normal operations and a dedicated registration wavelength when performing registration, thereby eliminating quiet window latency while managing the added complexity through a dedicated conversion component.
Data Source
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AI summary
The present application provides an optical network unit (ONU) registration method, an ONU, an optical line terminal (OLT) and a system. The method comprises: determining the working type of a current ONU according to the working type supported by the current ONU and a downlink message from an OLT, wherein the downlink message is used for marking the type of the ONU supported by the OLT; and completing registration to the OLT based on the determined working type of the current ONU.