Dynamic single-mode and modulation characteristics analyses for λ/4 phase-shifted distributed feedback lasers with chirped grating
- 作者：Xin-Hong Jia ; Dong-Zhou Zhong ; Fei Wang ; Hai-Tao Chen
- 关键词：λ ; /4 phase-shift ; Distributed feedback laser diode ; Chirped grating ; Dynamic single-mode suppression ratio ; Modulation response ; Frequency chirp ; Large signal analysis
- 刊名：Optics Communications
- 出版年：2007
- 期刊代码：50_00304018
- 类别：ph
- 出版时间：15 November 2007
- 卷：279
- 期：2
- 页码：356-363
- 文件大小：596 K
摘要
The dynamic single-mode and modulation performance of λ/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.