(19)
(11) EP 2 140 243 A1

(12)

(43) Date of publication:
06.01.2010 Bulletin 2010/01

(21) Application number: 08733675.6

(22) Date of filing: 28.03.2008
(51) International Patent Classification (IPC): 
G01M 11/02(2006.01)
H01S 3/082(2006.01)
H01S 5/026(2006.01)
 H01S 3/067(2006.01)
H01S 3/23(2006.01)
H01S 5/10(2006.01)
(86) International application number:
PCT/CA2008/000577
(87) International publication number:
WO 2008/116314 (02.10.2008 Gazette 2008/40)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30) Priority: 28.03.2007 US 907313 P
28.03.2007 US 727759

(71) Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC.
Québec, QC G1M 2K2 (CA)

(72) Inventors:
  • CYR, Normand
    Quebec, Quebec G1W 4B3 (CA)
  • CHEN, Hongxin
    Quebec City, Quebec G1W 0A6 (CA)

(74) Representative: Harrison Goddard Foote 
Orlando House 11c Compstall Road
Marple Bridge Stockport SK6 5HH
Marple Bridge Stockport SK6 5HH (GB)

   


(54) METHOD AND APPARATUS FOR DETERMINING DIFFERENTIAL GROUP DELAY AND POLARIZATION MODE DISPERSION