Polarization Dispersion Adder for Nonlinear Signal Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In digital coherent optical transmission systems, non-linear optical effects in optical fibers lead to signal light quality deterioration, which existing technologies fail to adequately address through attenuation or compensation.
Innovation Solution
A polarization dispersion adder is introduced, comprising polarization rotation and delay addition means to rotate and delay signal light pulses, effectively mitigating the impact of non-linear phenomena by temporally spreading optical power and polarization, thereby reducing peak power and minimizing quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal light is transmitted through optical fiber, then transmission capacity is increased, but non-linear optical effects cause signal quality deterioration
Solution Approach 1:
The patent applies preliminary action by adding polarization mode dispersion (PMD) to the signal light before transmission through the optical fiber. This pre-added PMD causes temporal spreading of the optical power profile, which reduces peak power and suppresses non-linear optical effects during transmission, thereby maintaining signal quality while preserving transmission capacity
2Object-affected harmful factors
If peak power of signal light is reduced, then non-linear effects are suppressed, but pulse duration increases
Solution Approach 1:
The patent changes the temporal distribution parameter of the signal light by adding PMD, which transforms the optical power profile from a concentrated pulse to a temporally spread profile. This parameter change reduces peak power to suppress non-linear effects while accepting increased pulse duration as a trade-off that is compensated by the overall system design
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 effectively suppresses signal light quality deterioration due to non-linear effects in optical fibers, enhancing transmission reliability and capacity by lowering peak power and extending pulse duration.
Implementation Method 1
polarization rotation means for rotating polarization of a pulse for each pulse of signal light
Implementation Method 2
delay addition means for adding an amount of delay corresponding to an amount of rotation of the polarization
Data Source
AI summary
In order to provide a configuration for suppressing deterioration in the transmission quality of a signal light due to a nonlinear phenomenon in an optical fiber, a polarization dispersion adder is provided with: a polarization rotation unit which, with respect to each pulse of signal light generated by modulating a light carrier, rotates and outputs the polarization of the pulse during a period from a pulse rise start time (T0) to a pulse fall completion time (T1); and a delay addition unit which adds a delay of an amount corresponding to the rotation amount of the polarization added by the polarization rotation unit to the pulse outputted from the polarization rotation unit.