Global Patent Index - EP 1092165 A1

EP 1092165 A1 2001-04-18 - APODIZATION OF OPTICAL FILTERS FORMED IN PHOTOSENSITIVE MEDIA

Title (en)

APODIZATION OF OPTICAL FILTERS FORMED IN PHOTOSENSITIVE MEDIA

Title (de)

APODISATION VON IN PHOTOSENSITIVEN MEDIEN GEBILDETEN OPTISCHEN FILTERN

Title (fr)

APODISATION DE FILTRES OPTIQUES FORMES DANS DES MILIEUX PHOTOSENSIBLES

Publication

EP 1092165 A1 (EN)

Application

EP 99932157 A

Priority

  • US 9914942 W
  • US 9154798 P

Abstract (en)

[origin: WO0002068A1] Filter gratings are formed in optical waveguides (50) having photosensitive cores by exposing the cores to actinic radiation in the form of interfering beams (38, 40) having peak intensities (72, 74) that are relatively displaced along an optical axis (64) of the waveguides. Each of the interfering beams has a single-lobed intensity profile and a degree of spatial coherence required to achieve a desired fringe contrast between the two relatively displaced beams. Index modulations in the photosensitive core match the illumination (interference) pattern of the radiation. The relative displacement of the interfering beams reduces side lobes of the gratings' spectral responses by leveling the average refractive index of the index modulations. A second exposure with the two beams but without the beams' interference effects further levels the average refractive index.

IPC 1-7 (main, further and additional classification)

G02B 6/34

IPC 8 full level (invention and additional information)

G02B 6/13 (2006.01); G02B 5/18 (2006.01); G02B 6/02 (2006.01); G02B 6/122 (2006.01); G02B 27/58 (2006.01); G02B 6/34 (2006.01)

CPC (invention and additional information)

G02B 6/02133 (2013.01); G02B 6/02085 (2013.01); G02B 6/02138 (2013.01); G02B 6/29347 (2013.01); G02B 27/58 (2013.01)

Designated contracting state (EPC)

DE FR GB IT SE

EPO simple patent family

WO 0002068 A1 20000113; AU 4852399 A 20000124; CA 2336329 A1 20000113; CN 1342269 A 20020327; EP 1092165 A1 20010418; EP 1092165 A4 20050622; JP 2002519742 A 20020702

INPADOC legal status


2006-02-01 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20050728

2005-06-22 [A4] SUPPLEMENTARY SEARCH REPORT

- Ref Legal Event Code: A4

- Effective date: 20050511

2005-06-22 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- IPC: 7G 02B 6/34 A

2001-04-18 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20010130

2001-04-18 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB IT SE