WDM PON Link Setup Method for Hybrid Network Configurations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing WDM PON systems face challenges in compatibility and increased costs due to varying network configurations, which hinder the development of hybrid WDM schemes and require different wavelength assignment processes, leading to inefficiencies in link setup and resource management.
Innovation Solution
A link setup method for WDM PON systems that assigns an initial wavelength during physical installation, using signal transmission and reception between the service providing device and new subscriber devices, allowing seamless application regardless of network configuration, and incorporates wavelength-tunable filters for dynamic wavelength management, enabling compatibility with existing products and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different wavelength assignment processes are used for different network configurations, then compatibility with specific configurations is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal wavelength assignment process that can handle multiple network configurations (spectrum-sliced, wavelength-locked, and wavelength-independent light sources) through a single standardized procedure. The OLT and ONU devices are designed to execute the same wavelength assignment protocol regardless of the specific light source type, eliminating the need for configuration-specific processes and reducing device complexity while maintaining broad compatibility
2Adaptability or versatility
If different wavelength assignment processes are used for different network configurations, then specific configuration performance is improved, but ease of manufacture and deployment worsen
Solution Approach 1:
The patent maintains configuration-specific optimization by allowing the wavelength assignment process to adapt its parameters based on the detected network configuration type. The system automatically adjusts wavelength selection criteria, tuning ranges, and assignment algorithms according to whether spectrum-sliced, wavelength-locked, or wavelength-independent light sources are used, while keeping the overall process framework standardized for easy deployment
3Productivity
If wavelength assignment is not performed during physical installation, then installation speed is improved, but link setup reliability worsens
Solution Approach 1:
The patent performs wavelength assignment as a preliminary action during the physical installation phase, before the ONU is fully activated and before data transmission begins. The OLT assigns wavelengths to newly connected ONUs in advance, ensuring that when the ONU becomes operational, the wavelength configuration is already in place, thereby guaranteeing link setup reliability without delaying the installation process
4Device complexity
If static wavelength assignment is used, then system simplicity is improved, but resource management efficiency worsens
Solution Approach 1:
The patent implements dynamic wavelength assignment where the OLT can reassign wavelengths to ONUs based on real-time network conditions, traffic demands, and resource availability. The system monitors wavelength utilization and automatically adjusts assignments to optimize resource management efficiency, while maintaining a relatively simple control architecture through centralized OLT management that avoids complex distributed coordination mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method ensures seamless link setup and compatibility across different network configurations, reduces costs by utilizing existing products, and enhances resource management through dynamic wavelength assignment and tuning, supporting hybrid WDM schemes and load balancing.
Implementation Method 1
data transmission/reception between each subscriber and a central office (CO) is performed using a unique wavelength assigned to the each subscriber
Implementation Method 2
the optical transceiver may include a wavelength-tunable filter
Data Source
AI summary
A link setup method for a wavelength-division-multiplexing passive optical network (WDM PON) system. The system includes a service providing device, a local node, and a plurality of subscriber devices. The link setup method includes assigning an initial wavelength for communication between the service providing device and a new subscriber device to be installed in the local node. The assigning of the initial wavelength may be performed as a part of process for activating the subscriber device, and this procedure may be performed between a physical layer of the service providing device and a physical layer of the new subscriber device.