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    COATING AN OPTICAL FIBRE
    2.
    发明专利
    COATING AN OPTICAL FIBRE 未知

    公开(公告)号：ZA8303150B

    公开(公告)日：1984-01-25

    申请号：ZA8303150

    申请日：1983-05-03

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： BISWAS DIPAK RANJAN ,  NATH DILIP KUMAR

    IPC: C03C25/42 ,  C03C25/10 ,  C03C25/22 ,  C23C16/46 ,  C23C16/48 ,  G02B6/44 ,  B05C ,  B05D

    CPC classification number: C23C16/481 ,  C03C25/104 ,  C03C25/1061 ,  C03C25/1063 ,  C03C25/223

    Abstract: An optical fiber which has just been drawn from an optical preform is provided with an external heremetic coating by using a heterogeneous nucleation thermochemical deposition technique. This technique involves passing the fiber through a reaction zone which contains a gaseous medium that includes a reactant which decomposes, or a mixture of reactants which chemically react, at a predetermined temperature to form the material of the coating. Only the fiber but not the gaseous medium surrounding the same is heated to the predetermined temperature, especially by directing radiation onto the exposed circumferential surface of the fiber, so that the decomposition or the chemical reaction takes place directly on the exposed surface of the fiber rather than in the gaseous medium, accompanied by simultaneous deposition of the coating material on the exposed surface of the fiber. The resulting fiber with heremetic coating can then be provided with an additional polymer coating layer.

    OPTICAL FIBER DRAWING USING PLASMA TORCH
    4.
    发明专利
    OPTICAL FIBER DRAWING USING PLASMA TORCH 未知

    公开(公告)号：DE3362282D1

    公开(公告)日：1986-04-03

    申请号：DE3362282

    申请日：1983-06-18

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： OH SHIN MO ,  NATH DILIP KUMAR ,  PUREZA PABLO CAPCO

    IPC: C03B37/025 ,  C03B37/027 ,  C03B37/029 ,  G02B6/00

    Abstract: In order to provide a high power heat source having a very clean and invariable heat flux, a ring plasma (31) is induced in a heating zone of a plasma torch including a plurality of coaxial tubular elements (45, 46, 47, 54) and the optical fiber (22) is drawn through a channel (54) passing axially through the center of the plasma torch and of the ring-shaped plasma (31). In this manner the preform (21) from which the fiber (22) is drawn can be placed in close proximity to the induced plasma without exposure to non-symmetrical temperature variations. Cooling gas passes through the heating zone either in an annular stream surrounding the plasma or in an annular stream passing through the center of the plasma around the preform and the fiber being drawn, or both. The heating zone is protected from environmental disturbances by an extension (52) of the outer tubular element (45) of the plasma torch which surrounds the heating zone. The plasma is induced by an RF source (33) in an undisturbed stream of a plasma-forming gaseous medium, such as argon or a mixture of argon with oxygen, which flows through the heating zone.

    FORMING OPTICAL PREFORMS
    5.
    发明专利
    FORMING OPTICAL PREFORMS 未知

    公开(公告)号：ZA833270B

    公开(公告)日：1984-01-25

    申请号：ZA833270

    申请日：1983-05-06

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： NATH DILIP KUMAR ,  SHIN MOO OH ,  PUREZA PABLO CAPCO

    IPC: C03B37/018 ,  C03B8/04 ,  C03B37/014 ,  C03B37/025 ,  G02B6/00 ,  G02B

    Abstract: Hydroxyl free deposition with high efficiency and at a high deposition rate may be achieved, even with use of relatively inexpensive raw materials, by utilizing a ring-shaped plasma activated axial chemical vapor deposition obtaining 100% chemical conversion and fractional volatilization of impurities. The plasma (2) is induced in an annular stream of a plasma-forming gaseous medium, and the reactant or reactants used in the axial chemical vapor deposition are introduced into the center of the ring-shaped plasma (2) to be converted by the heat of the plasma flame into glass precursor particulate which is deposited on a bait 4.An annular stream of a cooling medium flows outwardly past the plasma flame and is circumferentially centered by an extension (19) of the outer tubular element (9) of a plasma torch (1) in which the plasma is generated. An RF generator (18) which induces the plasma is operated at a frequency exceeding 20 MHz to give the plasma flame the desired ring-shaped configuration.

    6.
    发明专利
    未知

    公开(公告)号：DE3318107A1

    公开(公告)日：1983-11-24

    申请号：DE3318107

    申请日：1983-05-18

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： BISWAS DIPAK RANJAN ,  NATH DILIP KUMAR

    IPC: C03B37/016 ,  C03B37/075 ,  B05B1/14

    Abstract: A tubular formation of particulate optical material is formed by a layer slurry deposition process which involves spraying layer after layer of slurry containing particles of the optical material onto a rotating rod-shaped bait. The composition of the slurry and particularly the index of refraction of the optical material may be varied from one layer to another or from one group of layers to another to obtain a graded or stepped refraction index profile in the formation, in an optical preform formed therefrom, and ultimately in the fiber drawn from the optical preform. The particles of the slurry are suspended in a liquid vehicle which evaporates in the spray stream or shortly after deposition, and are coated with an organic binder which holds them together in the layer and in the formation, so that the formation is self-supporting. Then, the organic binder is removed and the formation is sintered, followed by a collapse of the sintered tubular formation into the optical preform in the form of a solid rod. Then, optical fiber of the desired optical properties can be drawn from the optical preform. The associated apparatus includes a spray gun aimed at the bait rod, and a receptacle for the slurry from which the slurry is supplied to the spray gun. The bait rod is clamped in chucks and is rotated, while the spray gun moves in the axial direction of the bait rod in a plurality of passes to deposit the formation on the bait rod.

    8.
    发明专利
    未知

    公开(公告)号：AT23848T

    公开(公告)日：1986-12-15

    申请号：AT83105736

    申请日：1983-06-11

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： NATH DILIP KUMAR ,  PUREZA PABLO CAPCO ,  OH SHIN MOO

    IPC: C03B37/018 ,  C03B8/04 ,  C03B37/014 ,  C03B37/025 ,  G02B6/00

    Abstract: Hydroxyl free deposition with high efficiency and at a high deposition rate may be achieved, even with use of relatively inexpensive raw materials, by utilizing a ring-shaped plasma activated axial chemical vapor deposition obtaining 100% chemical conversion and fractional volatilization of impurities. The plasma (2) is induced in an annular stream of a plasma-forming gaseous medium, and the reactant or reactants used in the axial chemical vapor deposition are introduced into the center of the ring-shaped plasma (2) to be converted by the heat of the plasma flame into glass precursor particulate which is deposited on a bait 4.An annular stream of a cooling medium flows outwardly past the plasma flame and is circumferentially centered by an extension (19) of the outer tubular element (9) of a plasma torch (1) in which the plasma is generated. An RF generator (18) which induces the plasma is operated at a frequency exceeding 20 MHz to give the plasma flame the desired ring-shaped configuration.

    9.
    发明专利
    未知

    公开(公告)号：NO841052L

    公开(公告)日：1984-09-24

    申请号：NO841052

    申请日：1984-03-19

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： WILLIAMS JOSEPH CLOBERRY ,  GARMON JEFF POWERS ,  BISWAS DIPAK RANJAN ,  NATH DILIP KUMAR

    IPC: C03C25/10 ,  C03C25/42 ,  G02B6/44 ,  C03C

    Abstract: A metallic material coating is applied to the external surface of a freshly drawn optical fiber while such surface is still pristine by passing the optical fiber through a body of liquid metal-organic material which forms a layer on the fiber, and by subsequently removing all non-metallic components from the layer of metal-organic material by volatilizing the same. The optical fiber with the layer metal-organic material is passed through a baking oven in which at least the layer is heated to a baking temperature at which organic materials present in the metal-organic material are volatilized and the remainder is baked to the fiber. Then, at least the layer is fired in a firing chamber at a higher temperature at which the metal-organic material is decomposed into its volatile non-metallic and non-volatile metallic components, the latter remaining in the layer and the former becoming volatile and leaving the layer. Preferably, at least one layer of synthetic plastic material is applied over the thus obtained metallic layer. When the firing is done in an inert or reducing atomsphere, the metallic material is in its elemental form, while it is in its metal-oxide form when the firing operation is accomplished in an oxidizing atmosphere. Various printing inks and/or resinates may be used as the starting metal-organic materials in the process according to the invention.

    10.
    发明专利
    未知

    公开(公告)号：NO832069L

    公开(公告)日：1983-12-15

    申请号：NO832069

    申请日：1983-06-08

    Applicant: INT STANDARD ELECTRIC CORP

    Inventor： NATH DILIP KUMAR ,  PUREZA PABLO CAPCO ,  OH SHIN MOO

    IPC: C03B37/018 ,  C03B8/04 ,  C03B37/014 ,  C03B37/025 ,  G02B6/00 ,  C03B

    Abstract: Hydroxyl free deposition with high efficiency and at a high deposition rate may be achieved, even with use of relatively inexpensive raw materials, by utilizing a ring-shaped plasma activated axial chemical vapor deposition obtaining 100% chemical conversion and fractional volatilization of impurities. The plasma (2) is induced in an annular stream of a plasma-forming gaseous medium, and the reactant or reactants used in the axial chemical vapor deposition are introduced into the center of the ring-shaped plasma (2) to be converted by the heat of the plasma flame into glass precursor particulate which is deposited on a bait 4.An annular stream of a cooling medium flows outwardly past the plasma flame and is circumferentially centered by an extension (19) of the outer tubular element (9) of a plasma torch (1) in which the plasma is generated. An RF generator (18) which induces the plasma is operated at a frequency exceeding 20 MHz to give the plasma flame the desired ring-shaped configuration.

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