Light Mark Modulation Using Periodic Frequency Alternation
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Solution Overview
Problem
Existing light mark technologies require a large number of frequencies for wavelength identification in optical networks, leading to increased hardware demands and interference issues, and are unable to accurately detect wavelength conflicts.
Innovation Solution
A light mark system using periodically alternating frequencies and intervals, where different wavelengths are distinguished by unique frequency combinations, and the same wavelength from different nodes is identified by varying intervals, reducing the number of required frequencies and improving demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency combination method is used to expand the number of marks, then the number of available marks increases, but the number of required frequencies and hardware complexity increase
Solution Approach 1:
The patent applies periodic action by using periodic frequency alternation in the light mark signal. Different frequencies are alternated periodically to represent different mark values, allowing a single frequency resource to generate multiple distinguishable marks through temporal periodicity. This resolves the contradiction by expanding mark capacity without proportionally increasing frequency resources or hardware complexity.
Solution Approach 2:
The patent changes the temporal parameter (period/duration) of frequency signals to encode additional information. By varying the duration or period of frequency occurrences, the system can distinguish different marks using the same frequency set, effectively expanding mark capacity without adding more frequencies or hardware components.
2Adaptability or versatility
If more frequencies are used for wavelength identification, then more wavelengths can be identified, but interference between frequencies increases
Solution Approach 1:
By using periodic frequency alternation with distinct patterns, the patent enables wavelength identification without requiring all frequencies to be simultaneously present. The temporal separation of frequency occurrences reduces mutual interference while maintaining the ability to identify multiple wavelengths through pattern recognition.
Solution Approach 2:
The patent segments the frequency usage in time domain, allocating different frequencies to different time slots within a periodic cycle. This temporal segmentation reduces frequency interference by ensuring that not all frequencies occupy the channel simultaneously, while still providing sufficient frequency combinations for identifying multiple wavelengths.
3Adaptability or versatility
If frequency combination method is used, then mark capacity increases, but demodulation complexity and power consumption increase
Solution Approach 1:
The periodic frequency alternation allows the system to reuse the same frequency resources in a time-division manner. This reduces the total power consumption compared to having all frequencies continuously active, while still achieving high mark capacity through the combinatorial possibilities of periodic patterns.
Solution Approach 2:
By encoding information in temporal parameters (duration, period, interval) rather than requiring additional frequency resources, the patent reduces power consumption. The same frequency can convey multiple bits of information through parameter variations, decreasing the energy required per information unit compared to using more frequencies simultaneously.
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 significantly reduces the number of frequencies needed, lowers hardware demands, enhances demodulation performance, and allows for accurate detection of wavelength conflicts, while minimizing interference and power consumption.
Implementation Method 1
a light modulator, connected to the processor, and adapted to receive the mark generated by the processor and modulate the mark onto an optical signal
Implementation Method 2
a photoelectric conversion unit, connected to the splitter, and adapted to receive the split light and photoelectrically convert the optical signal into an electrical signal
Data Source
AI summary
A light mark, a method and a device for light mark modulation and demodulation are disclosed. The modulation method includes: generating a mark with periodically alternating frequency and interval; and modulating the mark signal onto an optical signal. In the present disclosure, the mark with periodically alternating frequency and interval is adapted to distinguish different wavelengths by using different frequencies, and distinguish the same wavelength from different nodes by using the same frequency but different intervals. Therefore, numerous available marks are obtained with a small number of frequencies, and unique marks for all wavelengths in a network only require a number of frequencies equal to the number of the wavelengths in the network. Moreover, even if a wavelength conflict occurs, the wavelength conflict can be determined according to detected marks.