Dynamic single-mode and modulation characteristics analyses for lambda/4 phase-shifted distributed feedback lasers with chirped grating

作者：Jia, Xin Hong^*; Zhong, Dong Zhou; Wang, Fei; Chen, Hai Tao

来源：Optics Communications, 2007, 279(2): 356-363.

DOI：10.1016/j.optcom.2007.07.044

• lambda/4 phase-shift
• distributed feedback laser diode
• chirped grating-
• dynamic single-mode suppression ratio
• odulation response
• frequency chirp
• large signal analysis

The dynamic single-mode and modulation performance of lambda/4 phase-shifted distributed feedback laser diode with chirped grating (QWS-CG-DFB) are analyzed theoretically. The numerical simulation shows that, in contrast to purely QWS-DFB laser, the enhanced dynamic single-mode suppression ratio (SMSR) can be reached by QWS-CG-DFB laser. Under the smaller biasing current, the modulation band-width in presence of chirped grating is narrower, this difference shrinks for larger biasing current. For large signal modulation, the chirped grating is helpful to increase the output extinction ratio, but worsens the frequency chirping. The good dynamic characteristic can be obtained by selecting system parameters reasonably.

• 出版日期2007-11-15
• 单位重庆理工大学; 中国人民武装警察部队学院; 四川师范大学; 五邑大学