US 12,032,200 B2
Trench assisted multi-core optical fiber with reduced crosstalk
Apeksha Malviya, Gurugram (IN); Srinivas Reddy Munige, Gurugram (IN); Janarthanan Balakrishnan, Gurugram (IN); Shubham, Gurugram (IN); Ranjith Balakrishnan, Gurugram (IN); and Anand Pandey, Gurugram (IN)
Assigned to Sterlite Technologies Limited, Harayana (IN)
Filed by Sterlite Technologies Limited, Gurugram (IN)
Filed on Mar. 18, 2022, as Appl. No. 17/698,832.
Claims priority of application No. 202111061222 (IN), filed on Dec. 28, 2021.
Prior Publication US 2023/0204849 A1, Jun. 29, 2023
Int. Cl. G02B 6/02 (2006.01)
CPC G02B 6/02009 (2013.01) [G02B 6/02042 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A multi-core optical fiber, comprising:
a plurality of cores extending parallelly along a central axis of the multicore optical fiber, wherein each core of the plurality of cores is up-doped with an up-dopant, wherein each core of the plurality of cores has an associated core relative refractive index RRI, wherein the core RRI of the plurality of cores is equal;
a plurality of buffer layers, wherein each buffer layer of the plurality of buffer layers envelops a corresponding core of the plurality of cores; and
a plurality of trench layers, wherein each trench layer of the plurality of trench layers envelops a corresponding buffer layer of the plurality of buffer layers,
wherein each trench layer of the plurality of trench layers is down-doped with a down-dopant
wherein each trench layer of the plurality of trench layers has a trench relative refractive index (RRI) in a range of −0.1% to −0.25%, wherein the multicore optical fiber has a cable cut-off of less than or equal to 1260 nm.