公开(公告)号：JPH1020137A

公开(公告)日：1998-01-23

申请号：JP5591797

申请日：1997-03-11

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GREENE BENJAMIN I ,  NARAYANAN CHELLAPPAN ,  PRESBY HERMAN M

IPC: G02B6/14 ,  C03C23/00 ,  G02B6/02 ,  G02B6/12 ,  G02B6/122

Abstract: PROBLEM TO BE SOLVED: To provide a process for producing an optical waveguide structural body made of silica for converting a light beam of a first mode spot size to a light beam of a second mode spot size. SOLUTION: This process for production selects the radiation energy for irradiating the optical waveguide structural body made of silica in such a manner that this energy is at least partially absorbed by a clad 14. The irradiation of various doses are thereafter applied along the longitudinal direction of the waveguide structural bodies 13, 14. The refractive index change of the clad 14 is made larger than the refractive index change of the core 13 and the change rate thereof changes in the longitudinal direction. Consequently, the spot size of the light beam changes.