公开(公告)号：US09885889B2

公开(公告)日：2018-02-06

申请号：US15468117

申请日：2017-03-24

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Kei Katou ,  Norikazu Miyazaki ,  Ryo Shimizu

IPC: G02F1/035 ,  G02F1/03 ,  G02F1/225 ,  G02F1/21

CPC classification number: G02F1/0327 ,  G02F1/0316 ,  G02F1/225 ,  G02F2001/212 ,  G02F2201/58

Abstract: An optical modulator includes a first optical modulation section and a second optical modulation section which use modulation signals different from each other when applying a modulation signal to the modulation electrode and performing optical modulation. In addition, a light-receiving element is disposed on a substrate, and the light-receiving element has a first light-receiving section that detects optical signal propagating from a first waveguide which guides the optical signal output from the first optical modulation section. In addition, the light-receiving element also has a second light-receiving section that detects an optical signal propagating through a second waveguide which guides the optical signal output from the second optical modulation section.