Acta Photonica Sinica, Volume. 52, Issue 2, 0214004(2023)
High-stability MG-Y Laser Control System Based on Self-adaptive Current Compensation
The output stability of semiconductor lasers is simultaneously affected by current and temperature, and the power and wavelength of lasers are prone to fluctuations in practice, which may even damage lasers permanent. In this paper, a high-stability Modulated Grating Y-branch (MG-Y) laser control system based on self-adaptive current compensation is proposed to address the problems of poor stability of wavelength and power as well as the complexity of the laser control system. The whole system is integrated into a printed circuit board with a small size, light weight and low power consumption. Based on the current inner loop feedback, we optimize the parameters of Fuzzy Proportional-Integral-Differential (PID) algorithm by orthogonal experiments and propose a wavelength calibration algorithm based on self-adaptive current compensation.The high-stability MG-Y laser control system is described in detail. Firstly, we introduce the system device and principle of operation. MG-Y laser is controlled by 5 currents and operates at 25℃. Left reflector current (Ileft), right reflector current (Iright), and phase section current (Iphase) are used for wavelength adjustment, while the power is adjusted by the gain section current (Igain) and the semiconductor optical amplifier current (ISOA). The control system is mainly composed of MG-Y laser, constant current source chip ADN8810, temperature control chip ADN8834, and operational amplifier chip AD8620. Secondly, in terms of power stability, a Fuzzy PID control parameter optimization algorithm based on orthogonal experiments is proposed to reduce both the overshoot of laser power and adjustment times of control system. The number of orthogonal experiments and the range of Fuzzy PID parameters need to be confirmed, then we design the orthogonal tables by screening the value range of each control parameter. The algorithm can effectively approach the optimal value of each parameter and also improve the performance of the laser control system. In the wavelength calibration part, we propose a wavelength calibration algorithm based on self-adaptive current compensation to reduce the central wavelength drift of MG-Y laser at different power levels. The algorithm takes advantage of the wavelength fine-tuning characteristics of the phase section current Iphase, by adjusting Iphase from 0 to 7.5 mA, continuous tuning of wavelength in the range of about 0.3 nm is possible. After setting a standard wavelength λ, the Iphase region with stable wavelength variation and broad coverage is selected as linear compensation data region. ISOA scans in 1 mA steps until the range of the laser output power is fully covered, while the calibrated wavelength λ* is obtained by updating Iphase according to the compensation data region so that λ* is infinitely close to λ. We establish the look-up table for ISOA
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Yi HUANG, Yue YOU, Chuanlu DENG, Chengyong HU, Lisen WANG, Xiaobei ZHANG, Tingyun WANG. High-stability MG-Y Laser Control System Based on Self-adaptive Current Compensation[J]. Acta Photonica Sinica, 2023, 52(2): 0214004
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Received: Sep. 27, 2022
Accepted: Nov. 1, 2022
Published Online: Mar. 28, 2023
The Author Email: HUANG Yi (huangyi1008@shu.edu.cn)