Wavelength Tunable Laser Parameter Evaluation Method
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Solution Overview
Problem
Wavelength tunable lasers often fail to operate at the borders of the specified wavelength range, leading to waste of previously evaluated parameters, as they are unable to oscillate at wavelengths close to the borders when evaluation is performed from an intermediate wavelength.
Innovation Solution
A method is introduced to determine initial parameters and target values for auto-power control (APC) and auto-frequency control (AFC) feedback loops, where the evaluation iterates from the center of the wavelength range towards the peripheries, alternately checking the shortest and longest target wavelengths, and adjusting the wavelength range if the laser fails to generate an optical beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parameter evaluation is performed from an intermediate wavelength towards the borders, then the evaluation can be completed systematically, but the laser may fail to oscillate at border wavelengths causing parameter waste
Solution Approach 1:
The patent applies preliminary action by first evaluating parameters at border wavelengths (shortest and longest) before evaluating intermediate wavelengths. This reverse approach ensures that if the laser cannot oscillate at border wavelengths, the evaluation stops early without wasting time evaluating intermediate wavelengths, thus preventing parameter waste while maintaining systematic evaluation.
Solution Approach 2:
The patent inverts the conventional evaluation approach by starting from border wavelengths and moving toward the center, rather than starting from the center and moving outward. This inversion allows early identification of non-operational wavelength ranges, preventing unnecessary evaluation of parameters in regions where the laser cannot oscillate, thereby reducing parameter waste.
2Ease of operation
If parameter evaluation starts at one border wavelength, then the evaluation follows a simple sequential path, but the laser may fail to oscillate at the other border causing previously evaluated parameters to become waste
Solution Approach 1:
The patent segments the wavelength evaluation process into two independent directional paths: one from the shortest wavelength toward the center, and another from the longest wavelength toward the center. By evaluating both borders simultaneously and moving inward, the method ensures that if either border fails to oscillate, the evaluation stops early without wasting parameters evaluated in the non-operational direction, thus maintaining simplicity while reducing parameter waste.
Solution Approach 2:
The patent performs preliminary evaluation at both border wavelengths before proceeding to intermediate wavelengths. This allows early detection of non-operational borders and prevents unnecessary evaluation of intermediate wavelengths in those directions, reducing parameter waste while keeping the evaluation process straightforward.
3Adaptability or versatility
If the wavelength range is expanded to cover the full specification range, then the laser is expected to operate across all wavelengths, but oscillation failure at borders reduces the effective operational range
Solution Approach 1:
The patent performs preliminary evaluation at border wavelengths to determine the actual operational wavelength range before finalizing the laser's specifications. By identifying which borders support stable oscillation, the method adjusts the effective wavelength range to match actual performance, ensuring reliable operation within the guaranteed range while maintaining adaptability to the laser's true capabilities.
Solution Approach 2:
The patent changes the operational parameters by adjusting the effective wavelength range based on actual oscillation performance. Instead of fixing the wavelength range to the full specification range, the method dynamically determines the operational range by evaluating border wavelengths and excluding non-operational regions, thus ensuring reliability within the actual operational boundaries while maintaining versatility within those boundaries.
Data Source
AI summary
A method of determining initial parameters and target values for tuning an emission wavelength of a wavelength tunable laser capable of emitting laser light in a substantial wavelength range is disclosed. The method iterates an evaluation of initial parameters and target values at target wavelengths in a preset order. The evaluation includes steps of supplying empirically obtained parameters to the t-LD, confirming whether the t-LD generates an optical beams, determining the initial parameters and the target values by carrying out feedback loops of the AFC and the APC when the t-LD generates the optical beam, or shifting the wavelength range so as to exclude the current target wavelength when the t-LD generates no optical beam.