公开(公告)号：JP2000056144A

公开(公告)日：2000-02-25

申请号：JP11281099

申请日：1999-04-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ATKINS ROBERT MICHAEL ,  WINDELER ROBERT SCOTT

IPC: C03B8/04 ,  C03B37/018 ,  G02B6/00 ,  G02B6/02 ,  G02B6/16

Abstract: PROBLEM TO BE SOLVED: To improve the method for producing an optical waveguide device and to form a uniform soot layer by producing a soot layer by modified chemical vapor deposition(MCVD) method using a gas which decreases the reaction temp. SOLUTION: A glass or ceramic material is supplied as a substrate (A), on which a clad layer of silica soot is formed (B) by high temp. MCVD method usually used, while introducing a precursor gas mixture into the tube and heating the tube wall. Thus, a core layer of silica soot is formed, and when the torch passes over the soot depositing on the tube wall, it prevents the soot from sintering so that the core layer is deposited at low temp. Generally, the core soot is deposited at 40 to 200 mm/min moving rate in the transverse direction of the torch, and the max. temp. of the tube is maintained at 1450 to 1900 deg.C (C). The soot layer not sintered is doped with a soln. or exposed to a dopant gas (D). Then the soot is sintered with a torch at about 1950 to 2350 deg.C tube temp.

公开(公告)号：JPH10123338A

公开(公告)日：1998-05-15

申请号：JP26596097

申请日：1997-09-30

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ATKINS ROBERT MICHAEL ,  ESPINDOLA ROLANDO PATRICIO ,  SIMOFF DEBRA ANN

IPC: G02B6/02 ,  G02B6/10 ,  G02B6/34

Abstract: PROBLEM TO BE SOLVED: To make it possible to write refractive index gratings into an optical fiber which is as coated by preparing the specific silica-base optical fiber having a Ge-doped core exposed to a photosensitive agent and exposing this optical fiber to chemical rays in such a manner that the refractive index gratings are formed in the core. SOLUTION: The silica-base optical fiber 55 (having the core doped with the Ge) exposed to the photosensitive agent is prepd. This optical fiber 55 is exposed to the chemical rays 52 in such a manner that the gratings are formed in the core. The optical fiber 55 has a sufficient concn. of germanium oxide defect centers. This concn. is the concn. at which the fiber having the photosensitivity of at least 2 times and more preferably >=10 times the photosensitivity of the other optical fibers having the same performance may be provided. The photosensitivity is defined by Δn/(dosing quantity of the chemical rays) and Δn indicates the refractive index change by exposure of the optical fiber 55 to the prescribed quantity of the chemical rays 52.

公开(公告)号：DE69728729T2

公开(公告)日：2005-04-28

申请号：DE69728729

申请日：1997-09-30

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ATKINS ROBERT MICHAEL ,  SIMOFF DEBRA ANN ,  ESPINDOLA ROLANDO PATRICIO

IPC: G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02B6/16

Abstract: The method of making an optical fiber refractive index grating comprises writing the grating through the fiber coating. The method involves providing optical fiber of significantly higher photosensitivity than conventional fiber, such that the grating can be written before unacceptable darkening of the coating occurs. Such fiber is H2 and/or D2-loaded silica-based fiber having a Ge-doped core, the fiber selected to have a germanium-oxygen deficiency center content that provides the fiber with a photosensitivity that is at least twice as large as that of an otherwise identical, conventionally prepared, optical fiber. The fiber typically is drawn from a preform, at least a portion of which was exposed to a reducing atmosphere at an elevated temperature.

公开(公告)号：DE69728729D1

公开(公告)日：2004-05-27

申请号：DE69728729

申请日：1997-09-30

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ATKINS ROBERT MICHAEL ,  SIMOFF DEBRA ANN ,  ESPINDOLA ROLANDO PATRICIO

IPC: G02B6/02 ,  G02B6/10 ,  G02B6/34 ,  G02B6/16

Abstract: The method of making an optical fiber refractive index grating comprises writing the grating through the fiber coating. The method involves providing optical fiber of significantly higher photosensitivity than conventional fiber, such that the grating can be written before unacceptable darkening of the coating occurs. Such fiber is H2 and/or D2-loaded silica-based fiber having a Ge-doped core, the fiber selected to have a germanium-oxygen deficiency center content that provides the fiber with a photosensitivity that is at least twice as large as that of an otherwise identical, conventionally prepared, optical fiber. The fiber typically is drawn from a preform, at least a portion of which was exposed to a reducing atmosphere at an elevated temperature.