Sterlite Technologies Limited

The present invention relates to an optical fiber ( 200 ) having a core ( 202 ) extending along a central axis ( 206 ) and a cladding ( 204 ) concentrically surrounding the core ( 202 ). The core ( 202 ) has at least 83-mole percent (mol %) of Silicon dioxide (SiO2) and at most 17-mole percent (mol %) of an up-dopant and, the cladding ( 204 ) has at least 99-mole percent (mol %) of Silicon dioxide (SiO2). Further, the optical fiber ( 200 ) has (i) an effective area of greater than or equal to 100 μm 2 , (ii) a mode field diameter (MFD) in a range of 11 μm to 15 μm, and (iii) a chromatic dispersion of less than or equal to 23.5 picoseconds (ps/(Km·nm) at a wavelength of 1550 nm.

The present disclosure provides a micro sheath buffer tube with rollable optical fiber ribbons for optical fiber cable to reduce the overall cable diameter. The buffer tube indicates one or more subunits, a micro sheath layer and a plurality of water swellable yarns. The one or more subunits encloses a plurality of optical fiber ribbons. Each optical fiber ribbon of the plurality of optical fiber ribbons includes 12 optical fibers. Further, each of a plurality of optical fibers is a colored optical fiber. In addition, the micro sheath layer surrounds the one or more subunits. Furthermore, the one or more subunits has a coating layer of low smoke zero halogen material.

The present invention relates to an optical fiber cable ( 100 ) comprising an optical fiber unit ( 102 ), optical fiber ( 104 ), a tight buffer layer ( 106 ), a sheath ( 108 ), a plurality of strength members ( 110 a, 110 b, 110 c ), a water swellable element ( 112 ) and a filling strength member (SM) 114 . In particular, the optical fiber cable ( 100 ) is an all-dielectric communication cable with a preferential bending ratio between 1-2. Moreover, the strength members ( 110 a, 110 b, 110 c ) have an elastic modulus greater than 45 GPa and each strength member of the plurality of strength members ( 110 a, 110 b, 110 c ) has a diameter between 0.4 mm to 0.8 mm.

The present disclosure relates to a fiber enclosure ( 300 ) for receiving and managing a plurality of optical fibers including a housing defining an interior volume, a plurality of input ports ( 308 ) provided on at least one of the sidewalls ( 304 ), a plurality of fanout units ( 310 , 312 ) disposed within the housing, a multi-tiered adapter frame ( 402 ) comprising a stair arrangement removably mounted within the interior volume of the housing and and a plurality of optical fiber adapters ( 404 ). Further the multi-tiered adapter frame ( 402 ) includes a plurality of horizontally-extending step portions ( 412 ) separated by vertically-extending riser portions ( 430 ). Each of the horizontally-extending step portions ( 412 ) lie in a horizontal plane vertically offset from adjacent horizontally-extending step portions ( 412 ).

The invention discloses a draw tower ( 100 ) comprising a top end zone ( 108 ) to insert a preform along with fluid and the preform is melted into an optical fiber ( 106 ) that exits from a bottom end zone ( 110 ). The draw tower ( 100 ) includes a plurality of air knives ( 112 ) distorting optical fiber path such that partially uncooled optical fiber deviates from a vertical path to a bended path wherein the plurality of air knives ( 112 ) is a plurality of openings arranged such that to cause distortion on the vertical path of the optical fiber ( 106 ) in the draw tower ( 100 ) and the plurality of openings is a combination of one or more of a suction and pumping of the fluid. Further, the bended path length is greater than a vertical path length and is defined by laminar flow for at least 70% of the bended path length.

The present disclosure relates to a method and an extrusion apparatus ( 100, 200 ) to manufacture a soot preform ( 130 ). The extrusion apparatus ( 100 and 200 ) includes a feed-hopper ( 104 ) to feed silica slurry ( 102 ) which is pushed within the barrel ( 106 ), an iris frame ( 116 ) exhibiting a variable diameter to control a diameter of the soot preform ( 130 ), drying furnace ( 118 ), debinding furnace ( 122 ) eliminates moisture and one or more stabilized binders in the soot preform ( 130 ) to obtain a glass preform ( 138 ) from which an optical fiber ( 142 ) is drawn.

The present invention provides a hardened connector ( 100 ) configured to engage with a port ( 52 ) of an optical fiber terminal ( 50 ) comprises a multi-part assembly ( 102 ) with protruded skirt ( 108 ) positioned between a front end ( 104 ) and a rear end ( 106 ); a first intermediate portion ( 110 ) positioned between the rear end ( 106 ) and the protruded skirt ( 108 ) and a channel ( 130 ) formed between plurality of extended fingers and a recessed portion ( 118 ) configured to receive a mating protrusion ( 56 ) provided in the port, thereby enabling alignment of the hardened connector in the port of the optical fiber terminal. The protruded skirt ( 108 ) and the first intermediate portion ( 110 ) enable locking of the hardened connector ( 100 ) within the port, when the front end of the hardened connector is pushed into the port.

The present invention provides a hardened connector ( 100 ) for engaging at least one optical fiber ( 52 ) with an optical fiber terminal ( 70 ), the hardened connector ( 100 ) comprising: a first part ( 102 ), a second part ( 104 ), and a third part ( 106 ); the hardened connector ( 100 ) comprising an alignment mechanism ( 108 ) formed when at least two or the first part ( 102 ), the second part ( 104 ), and the third part ( 106 ) are engaged.

The present invention provides a converter unit ( 100 ) for convert a hardened connector ( 50 ) with small diameter into another hardened connector with large diameter such that the same hardened connector ( 50 ) compatible with two different types of fiber terminals i.e. small sized (new generation box) and large sized (old generation box). The converter unit ( 100 ) comprises an arrester unit ( 102 ) mounted over the small sized hardened connector via threaded lock, a shroud unit ( 104 ) coupled to the arrester unit ( 102 ) and a coupling nut ( 108 ) encapsulated over the shroud unit ( 104 ) to exhibit rotational and transaction movement over the shroud unit ( 104 ). Further, a first end ( 110 ) of the coupling nut ( 108 ) is restrained by the arrester ( 104 ) and a second end ( 112 ) of the coupling nut ( 108 ) being restricted by a shoulder ( 106 ) provided on the shroud unit ( 104 ).

The present invention relates to an optical fiber ( 100, 200, 300, 400 ) comprising one or more cores ( 102 ), a clad enveloping the one or more cores and a buffer clad layer ( 202, 302, 402 ) between the first clad layer and the second clad layer. Particularly, the clad includes a first clad layer ( 104 ) is made of silica with less than 0.1% metallic impurity and a second clad layer ( 106 ) is made of silica with greater than 0.1% of metallic impurity. Further, the first clad layer has less than 800 ppm OH content, less than 10 ppm aluminium and less than 2 ppm sodium and the second clad layer has less than 50 ppm OH content, more than 10 ppm aluminium and more than 2 ppm sodium.