Multi-Path Laser Wavelength Control via Thermal Decoupling
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Solution Overview
Problem
Current multi-path laser wavelength control systems in WDM networks face inefficiencies due to thermal cross-talk between lasers, leading to prolonged convergence times and reduced system efficiency, as they do not account for the cross-talk coupling between lasers.
Innovation Solution
A method and system that calculates a corrected temperature control amount for each laser by decoupling the initial control amount from the influence of other lasers, using a difference module, decoupling module, and temperature control module to set the die temperature of each laser, effectively addressing thermal cross-talk and improving wavelength adjustment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control system uses polling method to control die temperatures of multiple lasers, then the system complexity is reduced, but the convergence time for wavelength control is lengthened due to thermal cross-talk coupling between lasers
Solution Approach 1:
The patent divides the control system into multiple independent temperature controllers, each dedicated to controlling the die temperature of a specific laser. This segmentation allows parallel control of multiple lasers simultaneously, eliminating the sequential polling delay while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent implements a feedback mechanism where each temperature controller receives wavelength information from its corresponding laser and adjusts the die temperature accordingly. The controller calculates the required temperature adjustment based on the wavelength error and applies corrective heating or cooling to achieve precise wavelength control
2Productivity
If integrated laser array is used to output synthesized multiple optical signals, then the transmission bandwidth is increased, but the thermal cross-talk coupling between lasers increases, affecting wavelength stability
Solution Approach 1:
The patent segments the thermal control of the integrated laser array by providing dedicated temperature controllers for each laser element. This allows independent thermal management of each laser, preventing thermal cross-talk from one laser from affecting the wavelength stability of other lasers in the array
Solution Approach 2:
The patent dynamically adjusts the die temperature parameter of each laser based on real-time wavelength feedback. By changing the temperature parameter in response to wavelength deviations, the system compensates for thermal cross-talk effects and maintains stable wavelength output from each laser element
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 decouples the thermal influence between lasers, shortening the wavelength adjustment time and enhancing the system's efficiency by considering the impact of temperature changes on other lasers during control, thereby stabilizing the wavelength control process.
Implementation Method 1
a controller obtains a control amount of a die temperature of each laser (i.e., optical transmitter) by calculation and delivers it to the corresponding laser
Data Source
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AI summary
A method for controlling wavelengths of a multi-path laser is provided. The method includes: obtaining a difference between an actual output wavelength and a target output wavelength of each laser (S601); obtaining a corrected control amount of a temperature controller of each laser by decoupling calculation according to the difference (S602); and determining a die temperature of each laser according to the corrected control amount of the temperature controller (S603). A system for controlling wavelengths of a multi-path laser includes a multi-path laser (10), a difference module (12), a decoupling module (14), and a temperature control module (16).