摘要
The modulation response characteristics of a Fabry-Perot semiconductor laser(slave FP-LD) subjected to light injection from another Fabry-Perot semiconductor laser(master FP-LD) have been investigated theoretically.The results show that the modulation response performances of the slave FP-LD depend on the light injection strength,the central mode frequency detuning Δf and the mode spacing difference Δλ between the slave FP-LD and the master FP-LD.With the increase of the light injection strength from the master FP-LD,the 3 dB modulation bandwidth of the slave FP-LD will be enhanced;however,if the injection strength is increased to certain degree,the front side of the relaxation oscillation peak will be reduced to below 3 dB,which results in the rapid decrease of the 3 dB modulation bandwidth.With the increase of Δf,for a relatively small injection strength level,the 3 dB modulation bandwidth will behave a monotonous enlargement until the slave FP-LD operates in a period-one state(P1).For a relatively strong optical injection level,the slave FP-LD has a broad injection-locked frequency detuning area.Within the injection-locked area,with the increase of frequency detuning Δf,the 3dB modulation bandwidth increases at first and then decreases after experiencing a maximum value.For given light injection strength and frequency detuning,the 3 dB modulation bandwidth of the slave FP-LD has two maximums and behaves a symmetrical distribution with the change of Δλ.By choosing reasonable parameters,the 3 dB modulation bandwidth can be significantly improved.For the parameter values selected in this paper,the 3 dB modulation bandwidth can increase 5.5 times compared with the case of free running.
The modulation response characteristics of a Fabry-Perot semiconductor laser （slave FP-LD） subjected to light injection from another Fabry-Perot semiconductor laser （master FP-LD） have been investigated theoretically. The results show that the modulation response performances of the slave FP-LD depend on the light injection strength, the central mode frequency detuning △f and the mode spacing difference between the slave FP-LD and the master FP-LD. With the increase of the light injection strength from the master FP-LD, the 3 dB modulation bandwidth of the slave FP-LD will be enhanced; however, if the injection strength is increased to certain degree, the front side of the relaxation oscillation peak will be reduced to below 3 dB, which results in the rapid decrease of the 3 dB modulation bandwidth. With the increase of △f, for a relatively small injection strength level, the 3 dB modulation bandwidth will behave a monotonous enlargement until the slave FP-LD operates in a period-one state （P1）. For a relatively strong optical injection level, the slave FP-LD has a broad injection-locked frequency detuning area. Within the injection-locked area, with the increase of frequency detuning △f, the 3dB modulation bandwidth increases at first and then decreases after experiencing a maximum value. For given light injection strength and frequency detuning, the 3 dB modulation bandwidth of the slave FP-LD has two maximums and behaves a symmetrical distribution with the change of △λ By choosing reasonable parameters, the 3 dB modulation bandwidth can be significantly improved. For the parameter values selected in this paper, the 3 dB modulation bandwidth can increase 5.5 times compared with the case of free running.
基金
Supported by the Open Fund of the State Key Laboratory of Millimeter Waves of China (Grant No.K200805)
Natural Science Foundation of Chongqing City of China (Grant No.CSTC-2007BB2333)
关键词
半导体激光器
注射
曝光
表演
调制
optical injection, Fabry-Perot semiconductor laser （FP-LD）, modulation bandwidth, frequency detuning, mode spacing difference
