Optical Signal Filtering for Non-Linear Phase Fluctuation Control
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Solution Overview
Problem
Optical signals experience phase fluctuations due to non-linear optical effects during transmission, leading to deteriorated transmission characteristics in light transmission paths, particularly in high-speed backbone networks.
Innovation Solution
A light transmission apparatus with an optical signal generation unit and a filtering unit that sets the peak power spectral density of the optical signal to be equal to or less than a second reference value while maintaining an integrated power spectral density value greater than a first reference value, thereby suppressing non-linear optical effects and signal-to-noise ratio reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power spectral density of the optical signal is increased to improve transmission speed, then the transmission rate increases, but the non-linear optical effects cause phase fluctuations and signal deterioration
Solution Approach 1:
The patent applies parameter changes by modifying the power spectral density distribution of the optical signal. Specifically, it adjusts the peak power spectral density to be equal to or less than a second reference value while maintaining the integrated value at or above a first reference value. This redistribution of power across frequencies resolves the contradiction by enabling high transmission rates without exceeding the threshold that triggers non-linear optical effects and signal deterioration.
2Reliability
If the peak power spectral density is reduced to suppress non-linear optical effects, then signal deterioration is prevented, but the transmission efficiency decreases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by carefully controlling the power spectral density parameters. It sets the peak power spectral density to be equal to or less than a second reference value to suppress non-linear effects, while simultaneously ensuring the integrated value is at or above a first reference value to maintain transmission efficiency. This dual-parameter control enables both signal quality preservation and efficient transmission.
Solution Approach 2:
The patent applies dimensionality change by transitioning from controlling a single power level parameter to controlling two-dimensional parameters: the peak power spectral density and the integrated power spectral density. This multi-dimensional parameter control allows the system to navigate the trade-off between suppressing non-linear effects and maintaining transmission efficiency, resolving the contradiction by operating in a expanded parameter space.
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 effectively prevents signal deterioration during transmission and maintains a high signal-to-noise ratio, enhancing the reliability of optical communication systems.
Implementation Method 1
an optical signal generation unit that generates an optical signal for transmission by adding modulation based on a driving signal to a carrier wave
Implementation Method 2
a filtering unit that performs a filtering process on the optical signal for transmission or the driving signal
Implementation Method 3
An optical signal is subject to a phase fluctuation proportional to the square of amplitude due to a non-linear optical effect during its transmission through a light transmission path
Data Source
AI summary
An optical signal generation unit (110) generates an optical signal for transmission by adding modulation based on a driving signal to a carrier wave. A filtering unit (120) performs a filtering process on the driving signal. The filtering unit (120) may perform time domain equalization, and may perform frequency domain equalization. Specifically, the filtering unit (120) performs a filtering process on the driving signal, and thus sets a peak value of a power spectral density of the optical signal for transmission to be equal to or less than a second reference value while an integrated value obtained by integrating the power spectral density of the optical signal for transmission in a frequency direction is maintained at equal to or greater than a first reference value.