公开(公告)号：JPH07202848A

公开(公告)日：1995-08-04

申请号：JP29152594

申请日：1994-11-25

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： CHIYU GAN OKU ,  KIMU BOYON FUN ,  SHIN SO YON ,  KIMU GI HON ,  ON YON HOYOBU

IPC: H04Q11/00 ,  H04J3/00 ,  H04J14/00 ,  H04J14/02 ,  H04J14/08

Abstract: PURPOSE: To simultaneously compress and decompress an optical signal by an optical method of simple construction. CONSTITUTION: An optical signal is duplicated by a certain rule through (M+1) cascade connected 2×2 optical splitting/combining parts 102, 104, 105, 107 capable of simultaneously executing optical splitting and optical combination in both directions and M optical delay parts 103, 106. Optical isolation parts 101, 104 connected to respective one-ends of the optical splitting/combining parts arranged on both ends, and optical switching parts 108, 110 and control parts 111, 112 connected to the other ends of the optical splitting/combining parts on both ends are symmetrically arranged to pass an optical signal based on a certain rule. Thereby optical signals can be simultaneously compressed and decompressed in each N(=2M) unit. Consequently packaging or the like can easily be executed, the number of control means can be reduced and the stability of the system can be improved.