Tunable Wavelength Laser Control via Etalon Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tunable wavelength laser systems require high-precision temperature control during gridless control, which is costly and inefficient, especially when using etalons with high temperature dependency for fine wavelength adjustments.
Innovation Solution
A method for controlling a tunable wavelength laser system that calculates a second target value based on the difference between a first and second wavelength, allowing the laser to shift its wavelength without needing high-precision temperature control, by using a wavelength detector and etalon with temperature control devices to adjust the etalon's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If an etalon with high temperature dependency is used for fine wavelength adjustment, then the amount of temperature change required is small and power consumption is reduced, but high-precision temperature control becomes necessary
Solution Approach 1:
The patent introduces a wavelength shift detection mechanism as an intermediary between the etalon temperature control and the final wavelength output. By detecting the actual wavelength shift and using feedback to adjust the temperature, the system achieves precise wavelength control without requiring extremely high-precision temperature control hardware, thus reducing power consumption while maintaining accuracy
Solution Approach 2:
The patent implements a feedback control system where the wavelength detector monitors the actual wavelength output and feeds this information back to the temperature control device. This closed-loop feedback allows the system to achieve precise wavelength control with moderate temperature control precision, reducing the power consumption requirement compared to open-loop high-precision temperature control
2Adaptability or versatility
If gridless control is implemented to achieve any wavelength other than grid wavelengths, then wavelength flexibility is improved, but the complexity of temperature control increases
Solution Approach 1:
The patent uses feedback control where the wavelength detector provides real-time wavelength information to the temperature control device. This feedback mechanism simplifies the control complexity by automatically adjusting the temperature based on detected wavelength shifts, enabling gridless control without manually complex temperature management
Solution Approach 2:
The system performs self-correction by detecting wavelength shifts and automatically adjusting the etalon temperature through the temperature control device. This self-service mechanism reduces the operational complexity for users, as the system autonomously manages the temperature adjustments required for gridless wavelength selection
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 method eliminates the need for high-precision temperature control during gridless operation, reducing power consumption and operational costs while maintaining precise wavelength adjustments.
Implementation Method 1
a second value to control the wavelength characteristics of the etalon based on a difference between the first wavelength and the second wavelength
Data Source
AI summary
In the method for controlling a tunable wavelength laser, information designating an oscillation wavelength is inputted. A driving condition for causing laser oscillation at a first wavelength is acquired from a memory. A control value of wavelength characteristics of the etalon and a difference between the first wavelength and a second wavelength are referred to, and a control value of wavelength characteristics of the etalon for causing laser oscillation at the second wavelength is calculated. The control value of wavelength characteristics of the etalon are assigned to the tunable wavelength laser, and a wavelength is controlled so that a wavelength sensing result becomes a first target value. Information indicating a wavelength shift amount from the designated oscillation wavelength is inputted. The wavelength sensing result is calculated as a second target value. The wavelength is controlled so that the wavelength sensing result becomes the second target value.