US 9,810,837 B2
Hollow core waveguide with optimized contour
Fetah Benabid, Le Palais sur Vienne (FR); Frederic Gerome, Limoges (FR); and Benoit Debord, Limoges (FR)
Assigned to UNIVERSITE DE LIMOGES, Limoges (FR); CNRS, Paris (FR); and GLOPHOTONICS, Limoges (FR)
Appl. No. 14/897,537
Filed by UNIVERSITE DE LIMOGES, Limoges (FR); CNRS, Paris (FR); and GLOPHOTONICS, Limoges (FR)
PCT Filed Jun. 4, 2014, PCT No. PCT/FR2014/051326
§ 371(c)(1), (2) Date Dec. 10, 2015,
PCT Pub. No. WO2014/199048, PCT Pub. Date Dec. 18, 2014.
Claims priority of application No. 13 55314 (FR), filed on Jun. 10, 2013.
Prior Publication US 2016/0124144 A1, May 5, 2016
Int. Cl. G02B 6/02 (2006.01); B29D 11/00 (2006.01)
CPC G02B 6/02328 (2013.01) [B29D 11/00663 (2013.01); G02B 6/02338 (2013.01); G02B 6/02347 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A hollow-core waveguide, comprising:
a closed contour that comprises a series of arcs with a negative curvature, each arc comprising a chord, wherein
the contour of the hollow core comprises small arcs and large arcs arranged alternately, each arc being symmetrical with respect to a straight line passing through a center of the hollow core and the middle of the chord of the arc, a ratio b=2Ra/C of the large arcs being greater than 0.9 for the large arcs, Ra corresponding to a maximum distance between the chord and the arc, C corresponding to a length of the chord.