| 摘要 |
<p>An optical transmission circuit (2) modulates multimode oscillation light by an information signal and performs a prescribed operation to at least one oscillation mode light among multimode oscillation light, then, transmits the light to a light transmitting path. A light receiving circuit (8) receives an optical signal transmitted through the light transmitting path, restores an optical signal, which is the signal before the prescribed operation is performed, by performing a reverse operation to the prescribed operation. Then, the light receiving circuit converts the restored optical signal into an electric signal and reproduces the information signal.</p> |
