基于单纵模布里渊激光器的微波信号产生的研究

Research on microwave signal generation based on single longitudinal mode Brillouin laser

为了获得高精度的可调谐微波信号,利用掺铒光纤作为饱和吸收体构成Sagnac环作为激光单纵模选择元件,该选择元件与环形腔布里渊激光器构成双环结构的单纵模布里渊激光器,设计一种串联结构双PID高精度温度控制系统,通过串联PID算法,利用闭环负反馈结构实现温度的高精度.高稳定控制,当温度从26℃上升到目标温度40℃时,建立稳态的时间为35 s,超调量仅为0.1%。利用该温度控制系统控制布里渊激光器,当温度从25℃到85℃变化时,获得了11.04到11.106 GHz的微波信号输出,信号频率和温度的斜率为1.1MHz/℃,当泵浦波长从1528 nm到1565 nm变化时,获得了11.04到10.77 GHz的可调谐微波信号输出。

In order to obtain a highly accurate tunable microwave signal source,the Sagnac ring is formed by using an erbium-doped fiber as a saturated absorber as a laser single longitudinal mode selection element,and a single-mode Brillouin laser of a double ring structure is formed with the Sagnac ring and the annular cavity Brillouin laser.A high-precision temperature control system with series double PID control is designed.By adopting the series PID algorithm,the closed-loop negative feedback structure is used to realize the high-precision and stable temperature control.When the temperature rises from 26 ℃ to the target temperature of 40 ℃,the steady-state time is about 35 s,and the overshoot is 0.1%.The temperature control system is used to control the temperature of the Brillouin laser gain fiber.When the temperature changes from 25 ℃ to 85 ℃,the microwave signal output of 11.04 to 11.106 GHz is obtained.The slope of the signal frequency and temperature is 1.1 MHz/℃,when the pumping wavelength is changed from 1 528 nm to 1 565 nm,a tunable microwave signal output of 11.04 to 10.77 GHz is obtained.