公开(公告)号：JPH07301716A

公开(公告)日：1995-11-14

申请号：JP33423294

申请日：1994-12-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： KARURO DE BERUNARUDEI ,  SARUBUATOORE MORASUKA ,  FUABIO POTSUCHII

IPC: G02B6/122 ,  G02B6/12 ,  H04J14/00 ,  H04J14/02

Abstract: PURPOSE: To provide a filter in the shape of a resonant cavity properly balanced of a small size, filter directionality and a dead spectrum range. CONSTITUTION: In an integrated resonant cavity optical filter, the resonant cavity 2 is obtained with optical waveguide parts 5a to 5c, 6a to 6c, 7 and 8 generating two confronting Y-shaped couplers connected at the tips of Y-arms 5a, 5b, 7, 6a, 6b and 8. The Y-arms 5a, 5b, 7, 6a, 6b and 8 are a single mode waveguide part and on the other hand, Y-legs 5c and 6c are selected two-mode waveguide with a length where radiation reflected at free tips 9 and 10 to enter one of the two-mode parts 5c and 6c from one of the single mode parts 5a and 6b passed through from the same two-mode part the tip of which reflects the radiation to the other single mode parts 5b and 5a of the cavity 2.