| 摘要 |
PROBLEM TO BE SOLVED: To narrow a line width, to improve modulation efficiency and to improve frequency responses. SOLUTION: In a resonator 100, an active waveguide 140a and a passive waveguide 140b are formed. A Bragg diffraction grating 170b is formed in the passive waveguide 140b, light P generated in the active waveguide 140a is selectively reflected, and a laser beam L is oscillated. Such a laser beam L is frequency modulated (FM) by utilizing refractive index change inside the passive waveguide 140b by power applied through a second electrode 160b. Further, for the laser beam L, FM efficiency is adjusted through a resistance heating film 180b installed on an element surface 100C so as not to overlap with the second electrode 160b.
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