公开(公告)号：JPH09185024A

公开(公告)日：1997-07-15

申请号：JP22243996

申请日：1996-08-23

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： UORUYON UHAN ,  JIYANJIYOO KIMU

IPC: G02F1/01 ,  G02F1/025 ,  G02F1/065 ,  G02F1/225

Abstract: PROBLEM TO BE SOLVED: To provide a Mach-Zehnder interferometer type polymer electro-optical modulator formed so as to remove or reduce a DC drift problem appearing on a light modulator by using the optical bleaching characteristic of polymer. SOLUTION: A lower electrode layer 312. a lower clading layer 113, a guiding layer 114, an initial optical bleaching layer 115, a later optical bleaching layer 117, an upper clading layer 118, and electrodes 119a, 119b are successively laminated on a semiconductor substrate 111. The initial state of the electro-optical modultor is controlled by forming the 1st and 2nd electrodes 119a, 119b having respectively different lengths on the upper side of 1st and 2nd arms 116b, 116c branched between the input terminal 116a and output terminal 116d of an waveguide 116 and then connected to each other again by using the later optical bleaching layer 117 as a mask.