Wavelength-Selected WDM-PON ONU Registration via Dedicated Channels
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Solution Overview
Problem
In wavelength division multiplexing (WDM) passive optical networks (PON), the process of ONU registration is time-consuming and inefficient due to the need for ONUs and OLTs to search and choose working wavelengths, complicating the establishment of network connections.
Innovation Solution
Implementing a method where a pre-specified wavelength is dedicated for ONU registration, allowing the OLT to assign and inform the ONU of normal service wavelengths from a wavelength resource pool, streamlining the registration process and maintaining wavelength resource management through periodic status checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ONUs and OLT search and choose working wavelengths to establish network connection, then wavelength resource management is flexible, but the registration process becomes time-consuming and inefficient
Solution Approach 1:
The patent applies preliminary action by pre-assigning specific upstream and downstream wavelengths to each ONU during the registration phase. The OLT maintains a wavelength allocation table that pre-configures wavelength pairs for each ONU, eliminating the need for real-time wavelength search and selection during normal operation. This pre-configuration significantly reduces registration time while maintaining flexible wavelength resource management through the centralized allocation table.
2Productivity
If dedicated wavelengths are assigned for registration process, then registration efficiency is improved, but wavelength resource pool is reduced
Solution Approach 1:
The patent applies segmentation by dividing the wavelength resources into two distinct segments: registration wavelengths and service wavelengths. Specific upstream and downstream wavelengths are dedicated exclusively for the registration process, while the remaining wavelength pool is allocated for normal service operations. This segmentation ensures that registration operations do not interfere with service wavelengths and vice versa, improving registration efficiency without significantly impacting the overall service wavelength pool.
3Adaptability or versatility
If wavelength search and selection process is implemented, then wavelength allocation is dynamic, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing an automated wavelength allocation mechanism where the OLT maintains a centralized wavelength allocation table and automatically assigns wavelengths to ONUs during registration. The system uses automated wavelength assignment algorithms that match ONUs with appropriate wavelength pairs based on current resource availability, eliminating the need for manual configuration or complex negotiation protocols between ONUs and OLT. This automation reduces device complexity while maintaining dynamic wavelength allocation capabilities.
Data Source
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AI summary
A method of communication includes receiving, by an optical line terminal (OLT), a registration request from an optical network unit (ONU) through a specific upstream wavelength, assigning, by the OLT, out of a plurality of normal service upstream wavelengths and a plurality of normal service downstream wavelengths in a wavelength resource pool, a normal service upstream wavelength and a normal service downstream wavelength to the ONU for a normal service between the ONU and the OLT, and informing, through a specific downstream wavelength, the ONU of information regarding the normal service upstream wavelength and the normal service downstream wavelength. The specific downstream and upstream wavelengths are reserved for a registration process that includes receiving, through the specific upstream wavelength, the registration request and sending, through the specific downstream wavelength, the information regarding the normal service upstream wavelength and the normal service downstream wavelength.