(19)
(11) EP 4 020 026 B8

(12) CORRECTED EUROPEAN PATENT SPECIFICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 B1)

(48) Corrigendum issued on:
21.05.2025 Bulletin 2025/21

(45) Mention of the grant of the patent:
09.04.2025 Bulletin 2025/15

(21) Application number: 22150812.0

(22) Date of filing: 31.07.2019
(51) International Patent Classification (IPC): 
G02B 6/02(2006.01)
(52) Cooperative Patent Classification (CPC):
G02B 6/02328; G02B 6/02357

(54)

HOLLOW CORE OPTICAL FIBRE

HOHLKERN-LICHTLEITFASER

FIBRE OPTIQUE À ÂME CREUSE

(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 08.08.2018 GB 201812909

(43) Date of publication of application:
29.06.2022 Bulletin 2022/26

(60) Divisional application:
25160718.0 / 4538758

(62) Application number of the earlier application in accordance with Art. 76 EPC:
19750147.1 / 3834020

(73) Proprietor: University of Southampton
Southampton, Hampshire SO17 1BJ (GB)

(72) Inventors:
  • JASION, Gregory Teofil
    Southampton SO17 1BJ (GB)
  • POLETTI, Francesco
    Southampton SO17 1BJ (GB)

(74) Representative: CMS Cameron McKenna Nabarro Olswang LLP 
Cannon Place 78 Cannon Street
London EC4N 6AF
London EC4N 6AF (GB)


(56) References cited: : 
EP-A1- 3 249 432
   
  • BELARDI WALTER ET AL: "Negative curvature fibers with reduced leakage loss", OFC 2014; OPTICAL FIBER COMMUNICATION CONFERENCE; 9-13 MARCH 2014, SAN FRANCISCO, CALIFORNIA, UNITED STATES, OSA, US, 9 March 2014 (2014-03-09), pages 1 - 3, XP032633307, DOI: 10.1364/OFC.2014.TH2A.45
  • FRANCESCO POLETTI: "Nested antiresonant nodeless hollow core fiber", OPTICS EXPRESS, vol. 22, no. 20, 6 October 2014 (2014-10-06), US, pages 23807, XP055221870, ISSN: 2161-2072, DOI: 10.1364/OE.22.023807
  • MD. SELIM HABIB ET AL: "Low-loss hollow-core silica fibers with adjacent nested anti-resonant tubes", OPTICS EXPRESS, vol. 23, no. 13, 24 June 2015 (2015-06-24), pages 17394, XP055402307, DOI: 10.1364/OE.23.017394
  • A F KOSOLAPOV ET AL: "Hollow-core revolver fibre with a double-capillary reflective cladding", QUANTUM ELECTRONICS., vol. 46, no. 3, 29 March 2016 (2016-03-29), GB, pages 267 - 270, XP055502520, ISSN: 1063-7818, DOI: 10.1070/QEL15972
   
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).