DFB laser with nonuniform coupling coefficient realized by double-layer buried grating

1993 ◽  
Vol 5 (10) ◽  
pp. 1128-1131 ◽  
Author(s):  
S. Nilsson ◽  
T. Kjellberg ◽  
T. Klinga ◽  
J. Wallin ◽  
K. Streubel ◽  
...  
Keyword(s):  
Double Layer ◽  
Coupling Coefficient ◽  
Dfb Laser

Dependence of spectral linewidth on cavity length and coupling coefficient in DFB laser

1988 ◽  
Vol 24 (10) ◽  
pp. 613-614 ◽  
Author(s):  
S. Ogita ◽  
Y. Kotaki ◽  
K. Kihara ◽  
M. Matsuda ◽  
H. Ishikawa ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Cavity Length ◽  
Spectral Linewidth ◽  
Dfb Laser

4.6 nm Mode-Hop-Free Tunable DFB Laser with High Coupling Coefficient Gratings

2006 ◽  
Author(s):  
N. Nunoya ◽  
Y. Shibata ◽  
H. Ishii ◽  
H. Okamoto ◽  
Y. Kawaguchi ◽  
...  
Keyword(s):  
Coupling Coefficient ◽  
Dfb Laser

Effect of Interface Bond Condition on Airport Double-Layer Pavement Overlay’s Load Stress and Deflection

2013 ◽  
Vol 639-640 ◽  
pp. 429-433 ◽  
Author(s):  
Xing Zhong Weng ◽  
Xiang Cheng Yan ◽  
Wen Lu Liu ◽  
Lei Liang ◽  
Xin Qiang Li
Keyword(s):  
Double Layer ◽  
Coupling Coefficient ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Interface Bond

In order to study the influence of interface bond condition between new and old cement concrete pavement on overlay performance, the three-dimensional finite element model of the airport double-layer pavement was established. The pavement overlay's load stress and deflection were analyzed, the coupling coefficient between new and old cement concrete pavement was calculated based on the bottom of overlay deflection basin shape factor. The results show that the coupling coefficient reflects the degrees of interface bond condition well. Poor interface bond condition increases the overlay's load stress and deflection. The points that more closely distance from the wheels load center, the bigger the pavement overlay's load stress and deflection is. Therefore, more attention should be paid to the interface bond condition during the airport pavement overlay's designs and constructions.

Effect of metal contact's reflection on the effective coupling coefficient of second-order DFB laser diodes

2004 ◽  
Vol 42 (4) ◽  
pp. 339-342 ◽  
Author(s):  
Yuan Zhong ◽  
Xiaopeng Zhu ◽  
Guofeng Song ◽  
Yidong Huang ◽  
Lianghui Chen
Keyword(s):  
Coupling Coefficient ◽  
Laser Diodes ◽  
Second Order ◽  
Effective Coupling ◽  
Dfb Laser

scholarly journals Dynamic Response of Two-Electrode Distributed Feedback Laser for Stable Signal Mode Operation

2015 ◽  
Vol 5 (1) ◽  
pp. 23
Author(s):  
Hamza Bousseta ◽  
A. Zatni ◽  
A. Amghar ◽  
A. Moumen ◽  
A. Elyamani
Keyword(s):  
Dynamic Response ◽  
Coupling Coefficient ◽  
Communication Systems ◽  
Optical Fiber Communication ◽  
Distributed Feedback ◽  
Hole Burning ◽  
Mode Operation ◽  
Signal Mode ◽  
Dfb Laser ◽  
Dynamic Signal

The longitudinal spatial hole burning (LSHB) effect has been known to limit the performance of distributed feedback (DFB) semiconductor lasers to achieve a better dynamic signal mode operation (DSMO). So, in order to ensure a stable (DSMO), we propose a novel device design of two electrode DFB lasers with longitudinal variation in the coupling coefficient (distributed coupling coefficient (DCC)), the structure also contains a phase shifted in middle of the cavity. By means of the finite difference time domain (FDTD) numerical method, we analyze dynamic response of our structure and we also compare the results with the conventional two electrode DFB laser (TE-DFB). The numerical simulation shows that, a better dynamic signal mode has been achieved by TE-DCC-DFB lasers in comparison with TE-DFB laser due to its better and high side mode suppression ratio (SMSR). Therefore, the TE-DCC-DFB lasers will be useful to extend the transmission distance in optical fiber communication systems.

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