公开(公告)号：JPH0772516A

公开(公告)日：1995-03-17

申请号：JP16439594

申请日：1994-07-15

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KAN SENKEI ,  RI SHIYOUTAI ,  YU HEISHIYUU ,  TEI YASUMICHI ,  SAI EIKAN ,  BOKU HEIUN ,  RI KAZUTSUNE

IPC: G02F1/015 ,  G02F1/01 ,  G02F1/35 ,  H01L27/14 ,  H01L31/00

Abstract: PURPOSE: To provide an ultra-high speed optical switching element which is operative at ordinary temp. and is capable of overcoming the threshold of switching of a several tens nanosecond band. CONSTITUTION: If incident light 4 passes a first multiple quantum well structure 1 changed in the properties of light by control light 3, transmitted light 5 is so changed as to have an increased light quantity by exposure development. When this light passes a second multiple quantum well structure 2, the exposure development by this second multiple quantum well structure 2 is increased by the exposure development by the changed light during the first several picoseconds and the quantity of the transmitted light 5 is eventually increased. Namely, the intensity of the transmitted light 5 increases in the short time band. On the other hand, the second MQWS acts as an absorber and the transmitted light quantity is increased during several picoseconds in the long time zone past the several picoseconds. The long time constant is offset by the second MWQS and an off-time is shortened.