公开(公告)号：JPS62157014A

公开(公告)日：1987-07-13

申请号：JP29910685

申请日：1985-12-28

Applicant: AGENCY IND SCIENCE TECHN

Inventor： WATANABE MASANOBU ,  ITO HIDEO ,  MUKAI SEIJI ,  YAJIMA HIROYOSHI

IPC: H03K19/14 ,  G02F3/00 ,  G02F3/02 ,  H01S5/00 ,  H01S5/026 ,  H01S5/042

Abstract: PURPOSE:To obtain an element which has a high-grade function and a large number of degrees of freedom, by receiving a part of the optical output of a double electrode semiconductor laser by a photodetector and feeding back positively it to the double electrode semiconductor laser. CONSTITUTION:If an optical input Pi is increased from 0 to P2 P4 P1 P3 continuously when an optical feedback rate (f) is relatively high and a triple stable point exists, the characteristic line of a photodetector 2 is moved right in the figure. An optical output P0 is in the level L first because light is not emitted, and the optical output P0 is switched from the level L to the level M when the optical input Pi exceeds P1, and the optical output P0 is switched from the level M to the level H when the optical input Pi exceeds P3. If the optical input Pi is reduced continuously, the optical output P0 is switched from the level H to the level M when the optical input Pi is smaller than P4, and the optical output P0 is switched from the level M to the level L when the optical input Pi is smaller than P2. Thus, this element can be used as a ternary storage element.