Passive Optical Network Testing via Activation Bit Stream Identification
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Solution Overview
Problem
Network documentation in passive optical networks (PONs) often becomes outdated due to frequent reconfigurations, leading to difficulties in network servicing and a high risk of misconnection errors during optical power measurements.
Innovation Solution
A testing apparatus is introduced that captures and analyzes activation bit streams to identify network equipment, using an optical coupler and breaker switch to temporarily interrupt traffic, allowing for the extraction of identification information and optical power levels without disrupting the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If network documentation is not updated frequently, then documentation simplicity is maintained, but network servicing accuracy deteriorates due to outdated configuration information
Solution Approach 1:
The test device automatically extracts identification information from activation bit streams and updates network documentation without requiring technician intervention for verification, making the system self-updating and eliminating manual verification time
Solution Approach 2:
The system captures and stores identification information during the activation procedure itself, performing the documentation update action in advance before servicing operations begin, ensuring documentation is always current
2Reliability
If optical power measurements are performed without network identification, then measurement speed is maintained, but measurement reliability deteriorates due to misconnection errors
Solution Approach 1:
The test device combines identification extraction and optical power measurement functions into a single integrated apparatus, capturing both identification information and power levels during the same activation procedure without requiring separate devices
Solution Approach 2:
The test device performs multiple functions including capturing activation bit streams, extracting identification information, measuring optical power levels, and updating documentation, making a single device serve multiple purposes that previously required separate tools
3Reliability
If the optical circuit continuously monitors traffic, then network availability is maintained, but identification information capture reliability deteriorates due to traffic interruptions
Solution Approach 1:
The optical breaker switch periodically interrupts traffic flow at controlled intervals to capture activation bit streams from specific ONUs, allowing selective identification information capture without requiring continuous monitoring of all traffic
Solution Approach 2:
The optical breaker switch acts as an intermediary that temporarily controls traffic flow between the ODN and test device, enabling selective capture of activation signals while maintaining overall network connectivity through controlled interruption and restoration
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 accurate identification of network units and measurement of optical power levels, reducing misconnection errors and improving the efficiency of network servicing by synchronizing network documentation with the current configuration.
Implementation Method 1
an optical coupler comprising first and second through ports for carrying the bidirectional optical traffic therebetween, and a first drop port for dropping a portion of the upstream traffic
Implementation Method 2
first 38, second 42, and third 44 photodetectors for detecting optical signals at wavelengths of 131Onm, 1490nm, and 1550nm, respectively
Implementation Method 3
a wavelength division multiplexor (WDM) 68, and first 38, second 42, and third 44 photodetectors for detecting optical signals at wavelengths of 131Onm, 1490nm, and 1550nm
Data Source
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AI summary
A test apparatus and method for testing passive optical networks is provided. The test apparatus includes an optical circuit having an optical coupler for splitting off a portion of optical traffic. During testing of a passive optical network, the optical circuit is coupled into an optical path of the passive optical network. A bit stream corresponding to an activating procedure is captured and analyzed to extract identification information of the module that sent the bit stream.