Optical Node Frequency Modulation for Path ID
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical path establishment methods in optical networks face challenges in efficiently designing and optimizing the path due to quality degradation caused by cross-gain modulation and stimulated Raman scattering, especially when intensity-modulating optical data signals with low-rate path ID tones.
Innovation Solution
The method involves frequency-modulating a supervisory signal onto the main optical signal and using frequency-demodulation units in optical nodes to exchange and adjust parameters like OSNR, chromatic dispersion, and non-linear effects, optimizing the optical path without degrading the main signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If intensity modulation with low-rate path ID tone is used to establish optical paths, then path identification and establishment capability is improved, but cross-gain modulation and stimulated Raman scattering cause quality degradation of the main signal
Solution Approach 1:
The patent introduces a supervisory signal as an intermediary carrier to convey path identification and control information. Instead of modulating the main optical data signal with path ID tones, a separate supervisory signal is frequency-modulated with control information and superimposed on the main signal. This mediator approach allows path establishment functionality while isolating the main signal from degradation caused by modulation side effects.
Solution Approach 2:
The patent segments the control information transmission from the main data signal transmission. By separating path identification and control functions into a distinct supervisory signal channel, the system avoids the harmful interactions that occur when control tones are intensity-modulated onto the main signal. This segmentation resolves the contradiction by allowing both functions to operate independently without mutual interference.
2Productivity
If multiple modulation methods with various parameters are tested to establish optimum optical paths, then transmission optimization capability is improved, but design complexity and number of steps increase
Solution Approach 1:
The patent implements a feedback mechanism where the supervisory signal carries bidirectional control information between transmission and reception ends. The receiving end can detect the supervisory signal, evaluate transmission quality parameters, and send control commands back through the supervisory channel to adjust transmission parameters. This feedback loop enables automatic optimization of modulation parameters without requiring complex manual testing of multiple configurations.
Solution Approach 2:
The patent enables dynamic adjustment of transmission parameters (such as modulation depth, baud rate, FEC overhead) by modifying the frequency characteristics of the supervisory signal. Instead of testing multiple modulation methods separately, the system can rapidly change parameters through frequency modulation of the supervisory signal, simplifying the optimization process while maintaining the ability to evaluate different transmission conditions.
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 allows for efficient and optimized optical path establishment and maintenance by reducing quality degradation, enabling high-speed communication with accurate compensation of signal impairments without requiring additional optical components, thus improving network performance and reducing design complexity.
Implementation Method 1
a frequency modulation unit that superimposes a supervisory signal on a main signal by frequency-modulating the main signal
Implementation Method 2
a frequency demodulation unit that frequency-demodulates the supervisory signal superimposed on the received main signal
Data Source
AI summary
An optical node apparatus that establishes an optical path between a first optical node and a second optical node in an optical network include a frequency modulation unit that superimposes a supervisory signal on a main signal by frequency-modulating the main signal, and a frequency demodulation unit that frequency-demodulates the supervisory signal superimposed on the received main signal.