Global Patent Index - EP 1031065 A1

EP 1031065 A1 2000-08-30 - OPTICAL SYSTEM AND METHOD FOR CHANGING THE LENGTHS OF OPTICAL PATHS AND THE PHASES OF LIGHT BEAMS

Title (en)

OPTICAL SYSTEM AND METHOD FOR CHANGING THE LENGTHS OF OPTICAL PATHS AND THE PHASES OF LIGHT BEAMS

Title (de)

OPTISCHES SYSTEM ZUR ANDERUNG DER STRAHLENGÄNGE UND PHASEN VON LICHTSTRAHLEN

Title (fr)

SYSTEME OPTIQUE ET PROCEDE DE MODIFICATION DE LA LONGUEUR DES VOIES OPTIQUES ET DES PHASES DES FAISCEAUX LUMINEUX

Publication

EP 1031065 A1 (EN)

Application

EP 98954575 A

Priority

  • GB 9803404 W
  • GB 9810693 A
  • US 96943497 A

Abstract (en)

[origin: WO9924867A1] The optical system comprises two optical paths (P1, P2), and an arrangement for changing the length of the two paths including two phase modulators (M1. M2) one coupled to each of the paths. A driving system (Figure 3) applies power to the phase modulators to drive them in the same direction and to change the amount of power applied to the phase modulators in opposite directions so as to change the length of each optical path in a different direction. As a result, the relationship between the changes in the amount of power applied to the modulators and the resulting changes in the phase of light beams passing through the device becomes substantially linear.

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

G02F 1/225

IPC 8 full level (invention and additional information)

G02F 1/035 (2006.01); G02F 1/01 (2006.01); G02F 1/015 (2006.01); G02F 1/225 (2006.01)

CPC (invention and additional information)

G02F 1/0121 (2013.01); G02F 1/2257 (2013.01); G02F 2201/126 (2013.01)

Citation (search report)

See references of WO 9924867A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9924867 A1 19990520; CA 2309815 A1 19990520; CN 1285931 A 20010228; EP 1031065 A1 20000830; JP 2001523012 A 20011120

INPADOC legal status


2004-11-03 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040430

2004-02-04 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20031219

2000-08-30 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000613

2000-08-30 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB