Optical Splitter Port Identification with Wavelength-Selective Filters
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Solution Overview
Problem
Conventional PON systems face challenges in determining the topology connection relationship of the optical distribution network (ODN) without altering existing ONTs, as splitter ports connected to ONTs are invisible, requiring additional assemblies that compromise compatibility.
Innovation Solution
An optical distribution network with N levels of splitters, M first optical filters, and K power change assemblies, where each output port corresponds to a unique first optical filter and power change assembly, allowing identification of connected ports by analyzing power and wavelength variations of service light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional assemblies are added to ONT or receive optical path is changed to determine topology connection relationship, then port identification capability is improved, but compatibility with existing ONTs deteriorates
Solution Approach 1:
The patent introduces an intermediary device (identification device) that is inserted between the splitter and the ONT. This intermediary contains a receive optical path with wavelength division multiplexing capabilities, allowing it to detect wavelengths from different output ports without requiring modifications to the existing ONT. The intermediary acts as a mediator that enables port identification while keeping the ONT unchanged, thus resolving the contradiction between identification capability and compatibility.
2Ease of operation
If splitter ports connected to ONTs are made visible for topology determination, then network management capability is improved, but system complexity increases
Solution Approach 1:
The patent segments the optical distribution network into distinct functional modules: the original ODN (optical distribution network), the identification device with its own receive optical path, and the existing ONTs. By segmenting the system, the patent isolates the complexity of port identification within the identification device, while the rest of the network maintains its original simple structure. This allows network management capabilities to be improved without significantly increasing overall system complexity.
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
Enables identification of splitter ports connected to ONTs while maintaining compatibility with existing ONTs, simplifying manufacturing and improving port identification accuracy.
Implementation Method 1
each of the at least two output ports corresponds to at least one first optical filter, different output ports correspond to different first optical filters, and center wavelengths of detection light that the different first optical filters allow to pass through or do not allow to pass through are different
Implementation Method 2
the first power change assembly is configured to change a power of first service light from an optical line terminal based on received first detection light
Data Source
AI summary
An optical distribution network, an optical network system, a splitter, and a method for identifying a port of the splitter are provided. The optical distribution network includes a splitter, a first optical filter, and a first power change assembly. The splitter includes at least two output ports, each output port corresponds to at least one first optical filter, different output ports correspond to different first optical filters, and center wavelengths of detection light that the different first optical filters allow to pass through or do not allow to pass through are different. Each output port of each splitter in an Nth-level splitter corresponds to the first power change assembly, and the first power change assembly is configured to change a power of first service light based on received first detection light.