基于两个弱谐振腔法布里-珀罗激光器, 提出并实验研究了一种获取中心波长可调谐、混沌带宽可控的混沌信号产生方案.该方案是通过一个可调谐光纤布喇格光栅反馈弱谐振腔法布里-珀罗激光器(定义为主弱谐振腔法布里-珀罗激光器)输出的混沌光单向注入到另一个弱谐振腔法布里-珀罗激光器 (定义为副弱谐振腔法布里-珀罗激光器)来实现的.研究结果表明：通过改变可调谐光纤布喇格光栅滤波器的中心波长以及反馈回路的反馈强度, 主弱谐振腔法布里-珀罗激光器可输出中心波长在可调谐光纤布喇格光栅滤波器可调谐范围调谐的混沌信号; 把主弱谐振腔法布里-珀罗激光器输出的混沌信号进一步注入到副弱谐振腔法布里-珀罗激光器中, 通过改变注入强度和频率失谐, 可产生中心波长可调谐、带宽可大范围调节的混沌信号.

A scheme for generating tunable chaotic signals with controllable bandwidth was proposed and experimentally demonstrated based on two weak-resonant-cavity Fabry-Perot laser diodes, which is realized by that the chaotic signal from a weak-resonant-cavity Fabry-Perot laser diode (named as master weak-resonant-cavity Fabry-Perot laser diode) with tunable fiber Bragg grating optical feedback is unidirectionally injected into another weak-resonant-cavity Fabry-Perot laser diode (named as slave weak-resonant-cavity Fabry-Perot laser diode). The experimental results show that, through adjusting the central wavelength of tunable fiber Bragg grating and feedback strength, master weak-resonant-cavity Fabry-Perot laser diode can output chaotic signal whose central wavelength can be tuned within the tunable range of tunable fiber Bragg grating. Further injecting the chaotic signal from master weak-resonant-cavity Fabry-Perot laser diode into slave weak-resonant-cavity Fabry-Perot laser diode, the bandwidth of the tunable chaotic signal can be adjusted within a large range by varying the injection power and detuning frequency.