Optical Modulating Device Chirp Control for Dispersion Management
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Solution Overview
Problem
Optical fiber dispersion causes pulse broadening and inter symbol interference in optical fiber communication systems, limiting transmission distance and affecting signal quality due to low signal-to-noise ratio.
Innovation Solution
An optical modulating device comprising an optical splitter, an optical phase modulator, and an optical combiner, which splits, phase modulates, and combines optical signals to generate an outputting optical signal with a chirp, where the optical splitting ratio equals the optical combining ratio, enhancing signal-to-noise ratio and reducing dispersion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical signals are transmitted through optical fiber, then communication function is achieved, but pulse broadening and inter symbol interference occur due to dispersion, limiting transmission distance
Solution Approach 1:
The patent applies preliminary anti-action by introducing a chirp parameter to the optical signal before transmission. The optical modulating device pre-compensates for dispersion effects by modulating the optical signal with a chirp characteristic that counteracts the pulse broadening that will occur during transmission through the optical fiber, thereby extending transmission distance without requiring complex post-processing or regeneration
2Productivity
If optical signals are transmitted over long distances, then transmission distance is extended, but signal-to-noise ratio decreases, affecting demodulation accuracy
Solution Approach 1:
The patent applies parameter changes by optimizing the chirp parameter of the optical signal to improve signal-to-noise ratio. By adjusting the chirp parameter through controlled optical modulation, the system enhances signal quality and maintains better signal-to-noise ratio over extended transmission distances, thereby improving demodulation accuracy without sacrificing transmission range
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 optical modulating device improves demodulation accuracy and transmission performance by maintaining a better signal-to-noise ratio and reducing the impact of optical fiber dispersion, thereby extending the transmission distance of optical signals.
Implementation Method 1
The optical phase modulator couples the optical splitter to receive the first split optical signal and the second split optical signal and phase modulate the first split optical signal and the second split optical signal
Data Source
AI summary
A method for modulating signal quality of an optical modulation communication system comprising an optical modulating device is disclosed herein. An optical modulating device includes an optical splitter, an optical phase modulator and an optical combiner. The optical splitter splits an inputting optical signal by an optical splitting ratio to generate a first split optical signal and a second split optical signal. The optical phase modulator phase modulates the first split optical signal and the second split optical signal to respectively generate a first modulating optical signal and a second modulating optical signal. The optical combiner combines the first modulating optical signal and the second modulating optical signal by a combining ratio to generate an outputting optical signal having a desired chirp, the combining ratio being equal to the optical splitting ratio, the combining ratio being a positive number, and being less than one or more than one.