| 摘要 |
PURPOSE:To obtain a ring laser gyro, which has no degradation in reliability due to the problem of coupling for taking out an output and is suitable for mass production, by forming specific ring lasers, an output waveguide, a light detector, and a nonreflecting terminal in the same substrate. CONSTITUTION:Y branches 11a and 12a having directivity are provided in ring lasers 11 and 12 so that they are oscillated only in the reverse direction each other. They are not oscillated to the other directions since propagation loss is large. The ring laser 11 is oscillated only in the clockwise direction, and the ring laser 12 is oscillated only in the counterclockwise direction. An output waveguide 13, which forms a directional coupler that is coupled to both ring lasers 11 and 12, is provided between the two ring lasers 11 and 12. The parts of the outputs of the ring lasers 11 and 12 are taken out and synthesized, and the result is guided to a light detector 15. At the other end of the output waveguide 13, a nonreflecting terminal 14, which absorbs the reflection from the light detector 15 and natural emitted light from the ring lasers 11 and 12, is provided. |
