Dual Split WDM-PON Architecture with Cyclic AWG Channel Allocation
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Solution Overview
Problem
In optical networks, especially Fiber to the Home technologies, existing WDM PON architectures face inefficiencies due to the need for seeding sources and potential waste of seeding channels when networks are under-subscribed, leading to suboptimal resource utilization and power distribution.
Innovation Solution
The implementation of a dual split WDM-PON architecture with cyclic arrayed waveguide gratings and an optical splitting device that allocates and distributes multiplexed optical seeds and data signals based on signal performance and power loss across multiple distribution fibers, allowing for flexible allocation and reallocation of channels to optimize network usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a shared architecture with all seeding channels is used, then the network can support all possible channels, but seeding channels are wasted when the network is under-subscribed
Solution Approach 1:
The patent implements dynamic channel allocation where the network can flexibly assign seeding channels to different distribution nodes based on real-time subscription demand. The OLT controller monitors network usage and reallocates seeding channels dynamically, transitioning from a static all-channels-always-available approach to a dynamic on-demand allocation system that adapts to changing network conditions and subscriber needs.
Solution Approach 2:
The system changes the operational parameters of seeding channels by adjusting which channels are active and assigned to which distribution nodes based on network subscription levels. When the network is under-subscribed, fewer seeding channels are activated and assigned, reducing energy consumption while maintaining adequate service capacity. The parameter being changed is the activation and assignment state of individual seeding channels.
2Productivity
If modular components are used for scaling, then the network can be expanded by adding components, but resource utilization becomes suboptimal when networks are under-subscribed
Solution Approach 1:
The patent creates a universal seeding channel pool that can be allocated to serve multiple distribution nodes and different service scenarios. Instead of dedicating specific seeding channels to specific nodes (which causes waste when under-subscribed), the system establishes a multi-functional channel pool that can be dynamically assigned to any node that needs service, making the same seeding channels serve multiple purposes and multiple nodes as needed.
Solution Approach 2:
The system implements self-service resource allocation where the OLT controller automatically monitors network subscription status and reallocates seeding channels without manual intervention. When distribution nodes or ONUs are added or removed, the system self-adjusts the seeding channel assignments to match current network needs, eliminating the inefficiency of static resource allocation and ensuring optimal utilization at all times.
3Ease of manufacture
If fixed power distribution is used, then the system is simple to implement, but power loss is not optimized across multiple distribution fibers
Solution Approach 1:
The patent implements local quality optimization by adjusting power distribution according to the specific characteristics of each distribution fiber and its connected nodes. Instead of applying a uniform power distribution across all fibers, the system tailors the power allocation to local conditions such as fiber length, loss characteristics, and subscription density, ensuring each segment receives the appropriate power level to minimize overall power loss while maintaining service quality.
Solution Approach 2:
The system establishes a feedback mechanism where the OLT controller monitors power consumption and signal quality across different distribution fibers, then adjusts power distribution accordingly. This closed-loop control allows the system to identify which fibers or nodes are experiencing excessive power loss and dynamically adjust the power allocation to optimize efficiency, transitioning from fixed to adaptive power management based on real-time network conditions.
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
This approach enhances network efficiency by optimizing the allocation of optical seeds and data signals, reducing power loss, and enabling better utilization of resources, thereby improving the overall performance and cost-effectiveness of the optical network.
Implementation Method 1
an optical splitting device configured to receive multiplexed optical seeds and data signals, including a plurality of multiplexed individual optical seeds and a plurality of multiplexed individual optical data signals, via a feeder fiber, and to output the multiplexed optical seeds and data signals onto each of a first distribution fiber and a second distribution fiber
Implementation Method 2
A first cyclic arrayed waveguide grating (AWG) provided at a first node and coupled to the first distribution fiber, the first cyclic AWG configured to demultiplex the multiplexed optical seeds and optical data signals and to distribute, for one or more of the plurality of individual optical seeds and data signals, one of the individual optical seeds and one of the individual optical data signals to a respective optical network unit (ONU)
Data Source
AI summary
Various example embodiments are disclosed. According to an example embodiment, a dual split passive optical network (PON) may be provided that includes an optical splitting device, and a first and second distribution fibers connected to the optical splitting device. A first cyclic AWG may be coupled to the optical splitting device via the first distribution fiber and a second cyclic AWG may be coupled to the optical splitting device via the second distribution fiber. In other example embodiments, an asymmetric power splitting ratio may be used for the splitting device, or optical seeds and/or optical data signals may be allocated to each of the cyclic AWGs based on a performance of the optical data signals and/or power loss/attenuation of the respective distribution fibers.