T. Takiguchi et al., Selective-area growth for novel 1.3 mu m distributed feedback laser diodeswith graded grating, JPN J A P 1, 38(2B), 1999, pp. 1249-1251
We demonstrate a new approach to realizing graded grating, which is effecti
ve for improving the modulation characteristics of distributed feedback (DF
B) laser diodes (LDs) for analog optical transmission, by using the selecti
ve-area-growth (SAG) technique. An ideal parabolic thickness profile and a
thickness enhancement ratio as high as 4.6 in the grating layer have been r
ealized by optimizing the mask shape using the simulation technique for SAG
. We also successfully realized high light-current linearity in 1.3 mu m DF
B-LDs with a graded grating for the first time. It has been shown that the
LDs have excellent distortion characteristics.