Optical Transmission System Phase Conjugate Nonlinear Noise
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Solution Overview
Problem
In optical transmission systems, particularly in concentrated amplification relay systems, it is challenging to secure symmetry in the power map, which hinders complete compensation of nonlinear noise through phase conjugate conversion, limiting the transmission distance of optical signals.
Innovation Solution
The optical transmission system maximizes the frequency interval between channel components within a transmission band, generates a first optical signal through wavelength-division multiplexing, and employs a phase conjugate conversion unit to invert the spectrum of the first optical signal, thereby enhancing the transmission distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission power is increased to extend the transmission distance, then the optical signal-to-noise ratio is improved, but waveform distortion due to nonlinear optical effect increases
Solution Approach 1:
The patent applies phase conjugate conversion to invert the spectrum of the optical signal. By converting the optical signal into its phase conjugate (spectral inversion), the system exploits the symmetry properties of nonlinear phase noise to achieve complete compensation, thereby resolving the contradiction between maintaining high signal-to-noise ratio and suppressing waveform distortion from nonlinear effects.
Solution Approach 2:
The patent maximizes the frequency interval between channel components within the transmission band. This asymmetric frequency spacing optimizes the compensation of cross-phase modulation effects by phase conjugate conversion, allowing the system to extend transmission distance while maintaining signal quality by reducing the influence of nonlinear optical effects between closely spaced channels.
2Length of moving object
If phase conjugate conversion is used to compensate nonlinear noise, then transmission distance is extended, but complete compensation is hindered by asymmetry in power map
Solution Approach 1:
The patent deliberately maximizes frequency interval asymmetry between channel components to optimize phase conjugate conversion compensation. By asymmetrically spacing channels in frequency domain, the system achieves better compensation of cross-phase modulation effects, extending transmission distance despite the inherent asymmetry in power distribution across channels.
Solution Approach 2:
The patent changes the frequency spacing parameter between channel components to maximize the effectiveness of phase conjugate conversion. By optimizing this frequency interval parameter, the system achieves complete compensation of nonlinear phase noise even with asymmetric power maps, thereby extending transmission distance beyond the nonlinear Shannon limit.
3Object-affected harmful factors
If frequency interval between channel components is maximized, then cross-phase modulation is reduced, but transmission band utilization decreases
Solution Approach 1:
The patent maximizes the frequency interval between channel components to reduce cross-phase modulation effects. This asymmetric frequency spacing, combined with phase conjugate conversion, allows the system to maintain low nonlinear interference while efficiently utilizing the transmission band by optimizing the distribution of channels across the available spectrum.
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 improves the transmission distance of optical signals by reducing the influence of cross-phase modulation and maximizing the compensation of nonlinear phase noise, thereby exceeding the nonlinear Shannon limit.
Implementation Method 1
an optical parametric amplifier that amplifies the input optical signal by using a nonlinear optical effect in a nonlinear optical medium
Implementation Method 2
amplifies the input optical signal by using a nonlinear optical effect in a nonlinear optical medium
Implementation Method 3
phase conjugate conversion unit that generates a second optical signal by inverting a spectrum of the first optical signal
Implementation Method 4
an optical fiber to which a rare earth element is added is used for the optical amplification unit
Implementation Method 5
An erbium-doped optical fiber amplifier (EDFA) is one of typical rare earth doped optical amplification units
Implementation Method 6
an optical signal being transmitted through a transmission path (optical fiber) is amplified by Raman optical amplification
Data Source
AI summary
An optical transmission system, comprising:a transmission unit that maximizes a frequency interval between a plurality of channel components within a transmission band, and generates a first optical signal that is an optical signal in which the plurality of channel components are wavelength-division multiplexed, a first transmission path for transmitting the first optical signal, a phase conjugate conversion unit that generates a second optical signal by inverting a spectrum of the first optical signal, and a second transmission path for transmitting the second optical signal. The first transmission path and the second transmission path wavelength-disperse the plurality of channel components of the first optical signal and the second optical signal. The first transmission path may include one or more first optical relay units for amplifying and relaying the first optical signal. The second transmission path may include one or more second optical relay units for amplifying and relaying the second optical signal.