OTDR Trace Correction for SRS-Distorted OTN Fiber Testing
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Solution Overview
Problem
The Stimulated Raman Scattering (SRS) effect in Optical Transport Networks (OTNs) distorts OTDR traces, leading to inaccurate fiber performance testing due to power transfer between wavelengths, which conventional methods fail to address effectively.
Innovation Solution
A method involving parameter decoupling equations to separate fiber loss and SRS transfer coefficients, enabling OTDR trace correction by disabling and enabling OTN service wavelengths, and using these coefficients to correct OTDR test traces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If OTDR is used to test fiber performance in OTN, then fiber loss measurement is obtained, but trace distortion occurs due to SRS effect leading to inaccurate test results
Solution Approach 1:
The patent converts the harmful SRS effect into a beneficial measurement tool by using the SRS transfer coefficient to calculate and remove the SRS-induced power transfer from the OTDR trace, thereby correcting the distortion and improving measurement accuracy
Solution Approach 2:
The patent changes the measurement approach by introducing two key parameters: the fiber loss coefficient (α) and the SRS transfer coefficient (K). By measuring these parameters separately and using them in a corrected OTDR trace calculation, the system compensates for SRS distortion and achieves accurate fiber loss measurement
2Measurement precision
If parameter decoupling equation is used to separate fiber loss and SRS transfer coefficients, then measurement accuracy is improved, but testing complexity increases due to multiple measurement steps
Solution Approach 1:
The patent segments the measurement process into three distinct steps: (1) measuring fiber loss coefficient with OTN disabled, (2) measuring SRS transfer coefficient with OTN enabled, and (3) calculating corrected OTDR trace. This segmentation allows each parameter to be measured independently under controlled conditions, improving accuracy while making the complex process more manageable
Solution Approach 2:
The patent uses an intermediary approach by introducing a parameter decoupling equation that separates the coupled effects of fiber loss and SRS transfer. This equation acts as a mathematical mediator that allows independent determination of each coefficient, simplifying the analysis of the complex interaction between these two parameters
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
Improves OTDR detection accuracy by reducing trace distortion, enhancing detection range and precision in OTNs with and without fiber aging.
Implementation Method 1
the OTDR trace may become distorted due to the Stimulated Raman Scattering (SRS) effect in the OTN
Data Source
AI summary
An Optical Time-Domain Reflectometer (OTDR) trace correction method, an electronic device, and a storage medium are disclosed. The method may include: establishing a parameter decoupling equation according to a fiber loss coefficient and a Stimulated Raman Scattering (SRS) transfer coefficient in response to ignoring an SRS transfer amount amplified or absorbed by an OTDR wavelength in an Optical Transport Network (OTN) service; disabling a service wavelength of an OTN of an optical fiber transmission system, and acquiring, according to the parameter decoupling equation, a first OTDR trace of an OTDR simulation wavelength in the optical fiber transmission system when the service wavelength of the OTN is in a disabled state; determining a fiber loss coefficient according to the first OTDR trace.