公开(公告)号：JPH10246872A

公开(公告)日：1998-09-14

申请号：JP963998

申请日：1998-01-21

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GLASS ALASTAIR MALCOLM ,  JIN SUNGHO ,  LEMAIRE PAUL JOSEPH ,  STRASSER THOMAS A

IPC: G02B26/08 ,  G02B6/02 ,  G02B6/34 ,  G02B26/00 ,  G02F1/01 ,  H04B10/02 ,  H04B10/43 ,  G02B6/10 ,  G02B6/16 ,  H04B10/28

Abstract: PROBLEM TO BE SOLVED: To obtain a tunable fiber grating which has a wider tuning range and does not require continuous electric power. SOLUTION: The tunable fiber grating 10 is fixed to a magnetostrictive main body 14 and magnetic strain is transmitted to a grating 12. An electromagnet is arranged adjacently to the magnetostrictive main body 14 and a magnetic field is applied along the magnetostrictive main body 14. A current applied to the electromagnet is controlled to control a force transmitted to the fiber grating 10, i.e., the interval and reflection frequency of the grating 12. The magnetostrictive main body 14 is a column fixed along the grating 12. Further, magnetostrictive effect is mechanically amplified. Further, an addition/extraction multiplexer which uses the tuable fiber grating 10 is described.