Optical Signal Regeneration via Nonlinear Phase Shift and Pulse Broadening
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Solution Overview
Problem
Current optical regeneration devices fail to correctly regenerate signals encoded by phase modulation due to their inability to address phase distortions, which corrupt the information transmitted in optical networks.
Innovation Solution
An optical regeneration device featuring a nonlinear phase shift module with a nondispersive and nonlinear optical propagation medium, combined with a pulse linear broadening module and a linear compensation module, to compensate for phase differences between successive pulses, thereby reducing phase distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current optical regeneration devices act only on the amplitude of the signals, then amplitude regeneration is achieved, but phase distortion of the signals cannot be suppressed or reduced
Solution Approach 1:
The patent changes the operational parameter from amplitude-only processing to include phase processing by introducing a nonlinear phase shift module. This module applies a phase shift to the optical signal that is proportional to its intensity, thereby enabling phase distortion compensation while maintaining amplitude regeneration capabilities
Solution Approach 2:
The regeneration device is segmented into distinct functional modules: a linear broadening module for temporal pulse broadening, a nonlinear phase shift module for phase distortion compensation, and an amplitude regeneration module. This segmentation allows each module to address specific aspects of signal degradation independently
2Productivity
If pulses are transmitted in a nonlinear medium, then nonlinear interactions between successive pulses occur, but these interactions provoke phase distortions of the pulses
Solution Approach 1:
The patent converts the harmful nonlinear interactions that cause phase distortion into a beneficial effect by carefully controlling the nonlinear phase shift in the regeneration module. The nonlinear phase shift module applies a compensating phase shift that counteracts the distortion accumulated during transmission, transforming the previously harmful nonlinear effect into a useful correction mechanism
Solution Approach 2:
The device applies a preliminary compensating phase shift before the signal is fully detected, using the nonlinear phase shift module to pre-correct the phase distortions. This preliminary anti-action prevents the phase distortion from corrupting the information before detection occurs
3Productivity
If the pulses are temporally close together and/or broadened, then the nonlinear interactions between adjacent pulses are more sensitive to the nonlinearity of the medium, but this increases the phase distortions
Solution Approach 1:
The linear broadening module performs a preliminary action by temporally broadening the pulses before they enter the nonlinear phase shift module. This preliminary broadening increases the temporal separation between pulse peaks, reducing the intensity of nonlinear interactions and making the system less sensitive to nonlinearity-induced phase distortions while maintaining high bit rates
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 device effectively regenerates the phase of signals, improving the error rate by compensating for nonlinear interactions between pulses, thereby enhancing the quality of phase-modulated signals transmitted over optical networks.
Implementation Method 1
a phase shift module comprising a nondispersive and nonlinear optical propagation medium parametrized so as to compensate for the effect of the transmission of the signal in the optical network, induced on the phase difference between successive pulses
Implementation Method 2
a pulse linear broadening module situated in the operating chain before the phase shift module, this broadening module comprising a dispersive and linear optical propagation medium
Implementation Method 3
a module for the linear compensation of the broadening undergone by the pulses in the linear broadening module, situated in the operating chain after the phase shift module, this linear compensation module comprising a dispersive and linear optical propagation medium
Data Source
AI summary
The invention relates in particular to an optical regeneration device for a signal carrying an item of information encoded by phase modulation of that signal, that signal being transmitted over an optical network and comprising a temporal succession of optical pulses.The device comprises an optical pulse nonlinear phase shift module, a linear pulse broadening module a linear pulse broadening module, and a module for the linear compensation of the broadening undergone by the pulses in the linear broadening module.