Optical Power Distribution Estimation via Digital Line Simulation
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Solution Overview
Problem
Conventional digital longitudinal monitoring (DLM) techniques for estimating optical power distribution in optical transmission systems suffer from low spatial resolution and accuracy due to insufficient simulation of actual optical transmission line characteristics.
Innovation Solution
An optical power distribution estimation device and method that compensates for or applies the characteristics of optical transmission and reception devices to the received signal, using digital signal processing to simulate the actual optical transmission line more accurately, thereby improving estimation accuracy and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If digital signal processing is used to estimate optical power distribution, then measurement cost and operation cost are reduced, but estimation accuracy and spatial resolution deteriorate
Solution Approach 1:
The patent creates a digital twin model of the optical transmission line that copies and simulates the actual physical line's characteristics. This virtual replica allows accurate estimation of optical power distribution without requiring direct physical measurement at multiple locations, thus maintaining high accuracy while reducing measurement costs and complexity
Solution Approach 2:
The patent dynamically adjusts parameters in the digital twin model to match actual operating conditions. By continuously updating the simulation with current system parameters (signal characteristics, transmission conditions), the system maintains high estimation accuracy while avoiding expensive physical measurements, resolving the contradiction between cost reduction and accuracy maintenance
2Measurement precision
If direct measurement with analog instruments is performed, then estimation accuracy is improved, but equipment cost and operating cost increase
Solution Approach 1:
Instead of using expensive analog instruments for direct physical measurement, the patent creates a digital copy (digital twin) of the optical transmission line. This virtual model replicates the physical system's behavior through signal processing, achieving accurate estimation without requiring costly measurement equipment or direct physical access to multiple measurement points
Solution Approach 2:
The patent replaces the mechanical/physical measurement system (analog instruments requiring direct connection to optical nodes) with a digital signal processing system. By processing received signals through algorithms that account for transmission line characteristics, the system achieves accurate measurements without the need for expensive physical measurement equipment, thereby reducing both equipment cost and operational complexity
3Device complexity
If simple measurement is performed without considering device characteristics, then device complexity is reduced, but spatial resolution and estimation accuracy deteriorate
Solution Approach 1:
The patent incorporates transmission line characteristics (attenuation, dispersion, nonlinearities) as variable parameters in the digital twin model. By adjusting these parameters to match actual transmission conditions, the system achieves high spatial resolution and estimation accuracy while maintaining relatively simple measurement procedures, thus resolving the contradiction between simplicity and precision
Data Source
AI summary
An optical power distribution estimation device including: a coherent receiver that receives a signal transmitted from an optical transmission device via an optical transmission line; and an optical power distribution estimation unit that estimates an optical power distribution on a basis of at least a signal obtained by compensating for or applying a characteristic of an optical reception device to a reception signal received by the coherent receiver or a signal transmitted from the optical transmission device restored on a basis of the reception signal.