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选用不带内部隔离器的普通商用分布反馈式(DFB)半导体激光器作为从激光器,用一个经马赫-曾德尔外调制器进行奇数阶边带抑制调制的光信号作为探测信号,通过测量不同失谐频率条件下从激光器输出光信号经光电探测器检测所得的射频信号的功率,对光注入条件下DFB激光器的放大特性进行了研究,得到了不同注入功率比条件下DFB激光器的放大特性曲线。同时研究了-2级边带得到最大放大时的最佳失谐频率以及不同注入功率比条件下探测光信号的载波和-2级边带分别得到的增益。利用DFB激光器对探测光-2级边带的放大作用,得到了高边带抑制比的单边带信号,产生了二倍频本地振荡信号的微波信号。这为用光学方式产生高频微波信号提供了一种新的方法。
The common commercial distributed feedback (DFB) semiconductor laser with no internal isolator is chosen as the slave laser. The optical signal modulated by odd-order side-band suppressed modulation by the Mach-Zehnder external modulator is used as the detection signal. By measuring different detuning The power of the RF signal detected by the photodetector from the laser output optical signal under the frequency condition was studied. The amplification characteristics of the DFB laser under the light injection condition were studied. The amplification characteristics of the DFB laser under different injection power conditions were obtained. At the same time, the best detuning frequency when the -2-level sideband is maximized and the gain of the carrier and -2-level sideband of the probe optical signal under different injection power ratio are studied. By using DFB laser to amplify the second-order sideband of probe light, a single sideband signal with high sideband rejection ratio is obtained, and a microwave signal with twice-frequency local oscillation signal is generated. This provides a new method for optically generating high frequency microwave signals.