OTDR Signal Processing for PON Monitoring Accuracy
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Solution Overview
Problem
In passive optical networks (PON), existing optical layer monitoring technologies face challenges in continuously detecting and quickly recovering from distortion or attenuation along optical paths without disrupting services, and they often suffer from limitations in monitoring accuracy and sensitivity.
Innovation Solution
An optical layer monitoring apparatus and method utilizing an OTDR signal transceiver unit to transmit and receive OTDR signals, with an OTDR signal processing unit that measures and processes the received power to improve monitoring accuracy and sensitivity through pulse coding, signal processing algorithms, and spread coding to enhance dynamic range and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OTDR monitoring is used, then optical path monitoring is achieved, but monitoring accuracy and sensitivity are insufficient
Solution Approach 1:
The received OTDR signal is divided into multiple reception pulse trains, and reverse diffusion energy is measured for each pulse train separately. This segmentation allows for more precise measurement of optical path characteristics while maintaining high sensitivity through cumulative energy analysis.
Solution Approach 2:
The system transmits OTDR signals periodically and measures reverse diffusion energy for each received pulse train in a periodic manner. This periodic measurement approach enables continuous monitoring with improved accuracy while maintaining system reliability through consistent measurement intervals.
2Reliability
If optical path monitoring is performed continuously, then distortion and attenuation can be detected, but service disruption may occur
Solution Approach 1:
The patent uses reverse diffusion energy measurement as an intermediary parameter to monitor optical path status indirectly. By measuring the backscattered signal characteristics rather than directly interrupting data transmission, the system achieves continuous monitoring without disrupting subscriber services.
Solution Approach 2:
The monitoring system operates continuously by periodically transmitting OTDR signals and measuring reverse diffusion energy without interrupting the normal data transmission through the optical path. This allows uninterrupted service while maintaining continuous monitoring capability.
3Measurement precision
If signal processing complexity is increased to improve monitoring accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent extracts reverse diffusion energy from the received OTDR signal by separating it into discrete reception pulse trains. This extraction approach simplifies the processing by focusing on specific signal components (reverse diffusion energy) rather than analyzing the entire complex signal, thereby improving accuracy without proportionally increasing device 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
The solution enables continuous detection and quick recovery from optical path distortions, improving monitoring accuracy and sensitivity, thereby ensuring reliable PON operations with minimal service disruption.
Implementation Method 1
receives a backward scattering signal generated along the optical path due to the OTDR signal
Implementation Method 2
receives the OTDR signal backscattered or reflected from the optical path
Data Source
AI summary
An optical layer monitoring apparatus and method thereof are provided. According to an embodiment of the present invention, an optical layer monitoring apparatus including an optical time domain reflectometer (OTDR) function so as to monitor an optical path of a passive optical network (PON), and a method for improving accuracy of measured monitoring results using the optical layer monitoring apparatus are provided. Therefore, it is possible to enable a user to continuously detect distortion or attenuation along the optical path, and to quickly recover from the distortion or attenuation along the optical path when distortion or attenuation is detected.