公开(公告)号：US20210387893A1

公开(公告)日：2021-12-16

申请号：US17214856

申请日：2021-03-27

Applicant: Sterlite Technologies Limited

Inventor： Amjad Khan ,  Sudhakar Reddy ,  Samir Bhongade ,  Chitra D

IPC: C03B37/014

Abstract: A method for sintering of a glass preform with reduced helium gas consumption and with reduced cost without affecting any optical or other parameter of the fiber obtained from glass preform processed in this way. The method includes a first step to perform dehydration of the glass preform inside a dehydration module, a second step to perform down-feeding of the glass preform inside a sintering furnace, a third step to perform sintering of the glass preform inside the sintering furnace, a fourth step to move the glass preform in upward motion, and a fifth step to perform re-sintering of the glass preform inside the sintering furnace. Also, the glass preform undergoes dehydration for time period in range of about 20 minutes to 120 minutes. Also, dehydration of the glass preform is performed in presence of helium gas.

公开(公告)号：US20240321258A1

公开(公告)日：2024-09-26

申请号：US18471160

申请日：2023-09-20

Applicant: Sterlite Technologies Limited

Inventor： Pranjal Mishra ,  Pawar Gopal ,  Sudhakar Reddy

IPC: G10K15/00 ,  G02B6/02 ,  G10K11/28

CPC classification number: G10K15/00 ,  G02B6/02395 ,  G10K11/28 ,  C03B37/02736 ,  C03B2205/46

Abstract: The present disclosure relates to a method and apparatus for constraining an optical fiber (104) in the draw tower (100, 101). The method (700) includes steps of trapping (714) the optical fiber (104) in a central position along a vertical axis (Y-Y) by one or more acoustic waves generated by an acoustic centering apparatus (112). In particular, the vertical axis (Y-Y) is parallel to a draw tower axis (Y′-Y′) and/or coincides with the draw tower axis (Y′-Y′). The movement of the optical fiber (104) is constrained within 1 milli-meter from the vertical axis (Y-Y) with a coating ovality of a coated optical fiber (105) is less than 4%.

公开(公告)号：US20230399250A1

公开(公告)日：2023-12-14

申请号：US18177071

申请日：2023-03-01

Applicant: Sterlite Technologies Limited

Inventor： Pawar Gopal ,  Balamurugan Karunanidhy ,  Pranjal Mishra ,  Sudhakar Reddy

IPC: C03B35/00

CPC classification number: C03B35/005

Abstract: The present disclosure provides an apparatus to levitate an optical fiber having a tubular block defined by a central cavity and a plurality of slit walls. In particular, the tubular block has a reservoir that is adapted to store a fluid at a positive pressure. Each slit wall of the plurality of slit walls comprises one or more side slits and the plurality of slit walls defines a bottom slit such that the one or more side slits and the bottom slit provide one or more paths between the reservoir and the central cavity.

公开(公告)号：US12129198B2

公开(公告)日：2024-10-29

申请号：US17214856

申请日：2021-03-27

Applicant: Sterlite Technologies Limited

Inventor： Amjad Khan ,  Sudhakar Reddy ,  Samir Bhongade ,  Chitra D

IPC: C03B37/014

CPC classification number: C03B37/01446

Abstract: A method for sintering of a glass preform with reduced helium gas consumption and with reduced cost without affecting any optical or other parameter of the fiber obtained from glass preform processed in this way. The method includes a first step to perform dehydration of the glass preform inside a dehydration module, a second step to perform down-feeding of the glass preform inside a sintering furnace, a third step to perform sintering of the glass preform inside the sintering furnace, a fourth step to move the glass preform in upward motion, and a fifth step to perform re-sintering of the glass preform inside the sintering furnace. Also, the glass preform undergoes dehydration for time period in range of about 20 minutes to 120 minutes. Also, dehydration of the glass preform is performed in presence of helium gas.