Japanese Journal of Applied Physics, Volume 64, Number 2
Detuning dependence in current-light-output characteristics of GaN-based DFB laser diodes
Toshihiko Fukamachi1, Junichi Nishinaka1, Koichi Naniwae1, Shuichi Usuda1, Haruki Fukai1, Akihiko Sugitani1, Masahiro Uemukai2, Tomoyuki Tanikawa2, and Ryuji Katayama2
1Ushio Inc., Japan
2Osaka univ., Japan
In this study, we developed GaN-based laterally coupled distributed-feedback laser diodes (LC DFB-LDs) and systematically investigated the effect of the detuning ΔG—the difference between the DFB oscillation wavelength and the gain peak wavelength—on the temperature dependence of the current–light output characteristics. As ΔG increased, the rate of change of the threshold current with temperature decreased, and near ΔG = +5.3 nm, the current–light characteristics nearly overlapped over the temperature range from 25°C to 80°C. The characteristic temperature exhibited a negative value (−499.4 K). While the temperature coefficient of the gain peak wavelength increased linearly with increasing ΔG, that of the DFB oscillation wavelength remained nearly constant. These results provide useful insights for designing light sources that are robust against temperature variations or that exhibit optimal performance at specific temperatures.
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