US 12,276,829 B2
Preform for optical fiber with low chlorine concentration improvements relating to loss and its use, method of its production and use thereof
Jens Kristian Lyngsø, København S (DK); Christian Jakobsen, Virum (DK); Jesper Skov Gretlund, København S (DK); and Harald R. Simonsen, Lejre (DK)
Assigned to NKT PHOTONICS A/S, Birkerød (DK)
Filed by NKT Photonics A/S, Birkerød (DK)
Filed on Feb. 14, 2024, as Appl. No. 18/441,046.
Application 18/441,046 is a division of application No. 18/150,486, filed on Jan. 5, 2023, granted, now 11,947,160.
Application 18/150,486 is a continuation of application No. 17/845,358, filed on Jun. 21, 2022, granted, now 11,573,366, issued on Feb. 7, 2023.
Application 17/845,358 is a continuation of application No. 12/717,509, filed on Mar. 4, 2010, granted, now 11,402,572, issued on Aug. 2, 2022.
Claims priority of provisional application 61/157,422, filed on Mar. 4, 2009.
Prior Publication US 2024/0319436 A1, Sep. 26, 2024
Int. Cl. G02B 6/02 (2006.01); C03B 37/012 (2006.01); C03C 13/04 (2006.01); C03C 25/66 (2006.01)
CPC G02B 6/02342 (2013.01) [C03B 37/0122 (2013.01); C03C 13/045 (2013.01); C03C 25/66 (2013.01); C03B 2201/03 (2013.01); C03B 2201/20 (2013.01); C03B 2201/21 (2013.01); C03B 2203/14 (2013.01); C03B 2203/16 (2013.01); C03B 2203/42 (2013.01); G02B 6/02352 (2013.01); G02B 6/02357 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A preform configured for fabricating an optical fiber adapted to guide light at a wavelength λ, the preform comprising a hollow core part and an inner cladding part arranged to provide a hollow core region and a surrounding inner cladding region, respectively, in a fabricated optical fiber,
the inner cladding part comprising one or more precursor elements, wherein the one or more precursor elements comprises at least one of a first type of precursor element comprising a void and a surrounding first silica material, said first silica material having a first chlorine concentration, c1, of about 300 ppm or less.