Spatial Multiplex Optical Line Crosstalk Evaluation
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Solution Overview
Problem
Existing spatial multiplex optical transmission techniques face challenges in accurately evaluating characteristics like crosstalk and optical loss due to non-uniform mode coupling and optical loss along the optical fiber, which complicates signal restoration and transmission performance.
Innovation Solution
A method using a backscattered light intensity distribution waveform to calculate a transfer matrix for each minute distance section of a spatial multiplex optical transmission line, enabling the evaluation of crosstalk and optical loss even in cases of non-uniform mode coupling and optical loss, employing OTDR for light reflection measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical time-domain reflection measurement method is used, then measurement of crosstalk and optical loss distribution can be performed, but accurate evaluation becomes impossible when mode coupling or optical loss varies in longitudinal direction
Solution Approach 1:
The optical fiber transmission line is divided into multiple longitudinal sections, and a transfer matrix is calculated for each section independently. This segmentation allows the measurement system to handle non-uniform mode coupling and optical loss by treating each section with its own characteristics, thereby achieving accurate evaluation even when parameters vary along the fiber length.
Solution Approach 2:
The invention changes the measurement approach from assuming uniform parameters to calculating transfer matrices with position-dependent parameters. By using backscattered light intensity distribution waveforms and computing transfer matrices that reflect actual local conditions at each longitudinal position, the system adapts to varying mode coupling and optical loss characteristics.
2Quantity of substance
If spatial multiplex optical transmission technique is used to expand signal transmission capacity, then transmission capacity increases, but crosstalk and optical loss difference between spatial channels lead to deterioration in signal quality
Solution Approach 1:
The invention replaces complex signal processing methods with an optical measurement approach using backscattered light intensity distribution waveforms. By using optical time-domain reflection to directly measure crosstalk and optical loss in each spatial channel, the system can evaluate and compensate for channel variations without requiring complex electronic signal restoration processes.
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
This approach allows for accurate distributed measurement of crosstalk and optical loss, improving signal quality and transmission performance in spatial multiplex optical transmission lines with non-uniform mode coupling and optical loss.
Implementation Method 1
a backscattered light intensity measurement unit that acquires a combination of backscattered light intensities of individual transmittable spatial channels of an optical fiber obtained when test light, for the individual transmittable spatial channels of the optical fiber, is incident on the optical fiber
Data Source
AI summary
A backscattered light intensity measurement unit is presented that acquires a combination of backscattered light intensities of individual transmittable spatial channels of an optical fiber obtained when test light, for the respective transmittable spatial channels of the optical fiber, is incident on the optical fiber, and a transfer matrix calculation unit that calculates a transfer matrix for each section of the optical fiber in order from a side closer to an incident end of the test light, in which characteristics in a section of the optical fiber are evaluated by using the transfer matrix.