US 2026/0299191 A1Published application

Optical fiber with a heavily down doped region

OwnerJanarthanan Balakrishnan, Apeksha Malviya +2inventors

InventorsJanarthanan Balakrishnan, Apeksha Malviya, Srinivas Reddy Munige, Anand Pandey

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Abstract

The present invention relates to an optical fiber (100) for reduced loss, achieved through a deep trench structure formed and is bend-insensitive consists of a core region (102) with a relative refractive index (RI) ranging from 0.15% to 0.45%, surrounded by a cladding region (108) containing at least one low RI region (104) defined by a trench RI profile having a gradual decrease in RI. In particular, the minimum trench relative RI (Δtmin) ranges from −0.36% to −0.7%, and the thickness (T) of the low RI region (104) is between 10 μm to 16 μm. Further, the low RI region (104) is formed by doping fluorine into the porous core soot preform in the presence of fluorine-containing gases and carrier gases, ensuring efficient fabrication of optical fibers (100) with enhanced bend performance, low attenuation, and minimal micro bend losses, suitable for high-performance telecommunications.

Claims20

Dependent claims

An optical fiber (100, 200) comprising:

at least one core region (102) defined by a core relative refractive index (RI) (Δc) between 0.15% to 0.45%;
and
a cladding region (108) surrounding the at least one core region (102),
wherein the cladding region (108) comprises at least one low RI region (104),
wherein the at least one low RI region (104) is defined by a trench RI profile having a minimum trench relative RI (Δtmin), a minimum trench radius (Rtmin) corresponding to the minimum trench relative RI (Δtmin), and a core radius (Rc) corresponding to start of the at least one low RI region (104),
wherein the core radius (Rc) being a radius where first instance of relative RI being equal to zero is encountered when moving from the minimum trench relative RI (Δtmin) towards the centre of the optical fiber (100, 200) in a radial direction, wherein the at least one low RI region (104) is immediately adjacent to the at least one core region (102) such that a buffer radial thickness where RI is zero between the at least one core region (102) and the at least one low RI region (104) is less than 1 μm,
wherein the minimum trench relative RI (Δtmin) being in a range of −0.36% to −0.7%,
wherein the trench RI profile decreases gradually from the core radius (Rc) to the minimum trench radius (Rtmin) over a thickness range of 10 μm to 16 μm.

5 more elements

Dependencies are inferred from the claim text.