Optical da converting element |
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| 申请号 | JP21243781 | 申请日 | 1981-12-29 | 公开(公告)号 | JPS58116522A | 公开(公告)日 | 1983-07-11 |
| 申请人 | Omron Tateisi Electronics Co; | 发明人 | INOUE NAOHISA; MORI KAZUHIKO; MATANO MASAHARU; YAMASHITA MAKI; | ||||
| 摘要 | PURPOSE:To perform optical D/A conversion by diffracting parallel light beams which propagate in a light guide successively by a surface acoustic wave and then diffracting them successively by the 2nd surface acoustic wave in the opposite direction, and integrating the weighted light beams through a photodetector. CONSTITUTION:Parallel light beams P0-P7 introduced through a photocoupling part 23 into the light guide 12 on an LiNbO3 substrate 11 are deflected by being diffracted successively in the order of the light beams P7-P0 by a surface acoustic wave SAW1 propagating from a comb-shaped ultrasonic oscillator (IDT)21, and then deflected in a direction C by a surface acoustic wave SAW2 generated by an IDT22. Since corresponding distances lb0-lb7 of the SAW2 are set larger than distances la0-la7 from the IDT21 to respective diffraction points of the SAW1, the light beams P0-P7 traveling in a direction B before being diffracted by the SAW2 are inputted through the photocoupling part 24 to the photodetector 26 with digital loads increasing in said order to perform integration 27, thereby obtaining an analog value. | ||||||
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