US 12,072,521 B2
Optical fiber with low thermo-optic coefficient
Peter D. Dragic, Champaign, IL (US); John Ballato, Clemson, SC (US); and Thomas W. Hawkins, Clemson, SC (US)
Assigned to THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS, Urbana, IL (US); and CLEMSON UNIVERSITY, Clemson, SC (US)
Filed by The Board of Trustees of the University of Illinois, Urbana, IL (US); and Clemson University, Clemson, SC (US)
Filed on Oct. 23, 2020, as Appl. No. 17/079,090.
Claims priority of provisional application 62/925,013, filed on Oct. 23, 2019.
Prior Publication US 2021/0126422 A1, Apr. 29, 2021
Int. Cl. G02B 6/02 (2006.01); F21V 8/00 (2006.01); H01S 3/067 (2006.01); H01S 3/16 (2006.01)
CPC G02B 6/0003 (2013.01) [G02B 6/02004 (2013.01); H01S 3/06716 (2013.01); H01S 3/1601 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A fiber including:
a cladding; and
a core, wherein:
the core and cladding are formed to support multimode guiding at about room temperature and fewer modes guided at a guiding temperature above room temperature,
the fiber includes a bend with bending loss, and
the bending loss over the bend for a higher order mode increases with a fiber temperature above room temperature, and the bending loss over the bend increases disproportionately with temperature for the higher order mode relative to a fundamental mode.