| 摘要 |
PROBLEM TO BE SOLVED: To provide a TTG-DFB (turnable twin guided distributed feedback) laser device capable of sustaining an appropriate coupling coefficient and having characteristics suitable for use as an optical source for communication. SOLUTION: At a distance from an active layer and in the direction of thickness, a tuning layer is arranged, which has a transition wavelength which is shorter than the wavelength of simulated emission from the active layer. In between the active layer and the tuning layer, a diffraction grating layer is arranged, whose refraction index periodically varies relative to the direction of an optical resonator. A first electrode supplies a current to the active layer. A second electrode supplies a current to the tuning layer, and this current is supplied independently from the current for the active layer. COPYRIGHT: (C)2004,JPO&NCIPI
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