利用相位和强度调制器产生高消光比超短光脉冲

提出了一种产生高消光比超短光脉冲的新方法.利用相位调制器调制连续光生成啾啁光,而后利用M-Z强度调制器的倍频调制抑制对压缩不利的啁啾部分的影响,再通过等效啁啾光纤光栅进行压缩产生光脉冲.理论和仿真结果表明,该方法可以很好地消除光脉冲的基底及减小旁辦,产生消光比大于30 dB、波形理想的光脉冲,具有很强的可实现性.最后利用实际制作的色散系数为-380 ps/nm的等效啁啾光纤光栅对该方法进行了实验验证,结果表明,在重复频率为2.5 GHz、相位调制系数为9时,可产生脉宽小于18 ps的高质量光脉冲.

Highly extinctive ultra-short optical pulse generation using phase modulator and intensity modulator

A novel method for generating highly extinctive optical pulse was proposed. The continuouswave (CW) light is modl山ted by an electrooptic phase modulator, and then modulated by a Mach-Zehnder intensity modulator in which the undesirable chirp components are sufficiently restrained. The modulated light is compressed into pulses by an equivalent chirped 且ber Bragg grating (ECFBG). The theory analysis and simulation showed that the pedestal and wings can be diminished e伍ciently in this way, and ultra-short optical pulse with extinction ratio larger than 30 dB can be generated. The experiment based on ECFBG of which gro叩delay dispersion is -380 ps/nm was demonstrated, it shows that highly extinctive optical pulse shorter than 18 ps at repetition rate of 2.5 GHz can be got when the phase modulation index is 9.