Optimization method of optical wavelength locking circuit based on PID (Proportion Integration Differentiation) approximate three-dimensional setting

By using PID approximate three-dimensional adjustment method in the optical wavelength locking circuit, the driving current of the laser is dynamically adjusted, and the problems of insufficient laser excitation and excessive wavelength locking frequency at low power consumption are solved, thereby achieving high-precision wavelength control and stability improvement.

CN119696695APending Publication Date: 2025-03-25SOUTHWEAT UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411807089.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

In the low-power conditions, the laser is insufficiently stimulated, and the optical wavelength lock compensation frequency is too high to reach a stable value. Increasing sensor sensitivity and replacing high-performance chips will increase costs.

Method used

The optical wavelength locking circuit optimization method based on PID approximate three-dimensional adjustment is adopted. By adjusting the driving current of the laser, using fuzzy control rules and dynamic adjustment of PID parameters, high-precision control of the laser output wavelength is achieved.

Benefits of technology

It improves the stability of wavelength output, reduces the output wavelength error, and achieves the improvement of wavelength accuracy to within ±10pm, reduces the power consumption of the system, and enhances the robustness and adaptability of the system.

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Abstract

The invention provides an optical wavelength locking circuit optimization method based on PID (Proportion Integration Differentiation) approximate three-dimensional setting, which belongs to the technical field of optical fiber communication, and comprises the following steps: establishing a relationship between a laser driving current and an output wavelength thereof, recording corresponding output wavelengths under different current values, and forming a data set; defining an error E, an error change rate ECC and an error accumulation EC; establishing a fuzzy control rule; constructing an SOA region current-stable wavelength relation table; pID parameter adjustment is carried out; performing iterative optimization; by introducing a feedback mechanism, the system automatically adjusts the driving current of the laser according to the output wavelength information monitored in real time, and the stability of the wavelength is kept. The PID approximate three-dimensional setting method is applied to the relation between the current and the wavelength, and high-precision control over the output wavelength of the tunable laser is achieved. The method not only improves the accuracy of wavelength locking, but also enhances the robustness and adaptability of the system.
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