R-ONU Wavelength Control via Temperature Offset
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Solution Overview
Problem
In passive optical networks, the simultaneous transmission of optical signals from multiple R-ONUs can lead to wavelength overlap phenomena, such as optical beat interference, which degrades signal quality and may cause network service disruptions.
Innovation Solution
A method is implemented where a controlling unit in the R-ONU calculates the initial external temperature using a temperature sensor, determines an operation range for the temperature setting unit, and adjusts the temperature to generate optical signals with specific wavelengths, minimizing overlap by applying an offset temperature to the initial set temperature based on current conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple R-ONUs transmit optical signals simultaneously using the same wavelength, then the network can operate efficiently with simple wavelength assignment, but wavelength overlap occurs causing optical beat interference and signal quality degradation
Solution Approach 1:
The patent changes the wavelength parameter of optical signals by controlling the temperature of laser diodes in R-ONUs. Each R-ONU adjusts its laser diode temperature to shift the operating wavelength, thereby avoiding wavelength overlap and optical beat interference while maintaining efficient network operation
Solution Approach 2:
The system dynamically adjusts the wavelength of optical signals based on real-time temperature sensing and control. The R-ONUs continuously monitor external temperature and adjust their laser diode temperatures accordingly to maintain optimal wavelength separation, enabling adaptive wavelength management in response to environmental changes
2Reliability
If the temperature setting unit operates outside its specified operation range to achieve wavelength conversion, then wavelength overlap can be avoided, but the temperature setting unit and R-ONU may be damaged or malfunctioned
Solution Approach 1:
The system takes preliminary action by determining the available wavelength range based on the temperature setting unit's operation range before actual wavelength conversion. It calculates offset temperatures that achieve wavelength separation while keeping the final operating temperature within safe limits, thereby preventing device damage before it can occur
Solution Approach 2:
The patent performs preliminary calculation of the wavelength range that can be achieved within the safe operation range of the temperature setting unit. This advance planning ensures that wavelength conversion is performed safely without exceeding device temperature limits
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 reduces the likelihood of wavelength overlap, ensuring signal quality and extending the lifespan of the temperature setting unit and R-ONU by minimizing extreme temperature changes.
Implementation Method 1
calculating an initial external temperature sensed by a temperature sensor
Implementation Method 2
a light generating unit is configured to generate an optical signal having a wavelength according to the current set temperature of the temperature setting unit
Data Source
AI summary
According to the present disclosure, a controlling unit arbitrarily determines a current set temperature of a temperature setting unit to cause a light generating unit connected to the temperature setting unit to generate an optical signal having a wavelength according to the current set temperature, thereby making it possible to effectively reduce a wavelength overlap phenomenon that may occur when a plurality of R-ONUs in a passive optical network simultaneously transmit the optical signals.