The device and method of manufacturing optical fiber

 

(57) Abstract:

Device for manufacturing optical fiber contains a furnace for melting the preform of the optical fiber with the possibility of pulling the uncoated optical fiber, a device for applying a protective coating, a ratchet for drawing optical fiber from the preform of the optical fiber by the application of tension, the connection device for fastening a primary preform for optical fibres, put in the tube outer covering, and a control device position for attachment of the device connecting with a possibility of the main optical fiber associated with the tube outer coating to controlling the position. The way you put the outer cover and pull the optical fiber. Reduced manufacturing time and cost. 2 s and 5 C.p. f-crystals, 9 Il.

The invention relates to a device for drawing optical fiber from the preform of the optical fiber.

Currently quartz optical fiber used in communication networks with ultra-fast data transfer is made by way of an external vapor deposition (OVD) or by way of a modified t operations hydrolysis of chemical gas, consisting of gaseous SiCl4and alloying by roasting with simultaneous supply of oxygen to the deposition of soot SiO2on the outer side of the workpiece and dehydration by sintering of deposited soot in a high temperature furnace using Cl2and He2. The MCVD method allows to obtain the deposition of multiple layers inside a quartz tube by filing a chemical gas consisting of SiCl4and simultaneous doping with oxygen. In the deposition of several layers of the covering part is formed first, and the second core. After that, the quartz tube with a deposition is heated simultaneously with the filing Cl2and He, in order to form a compact quartz rod. However, the lack of MCVD method is that you cannot perform the work piece diameter above 25 mm, Therefore, to address this shortcoming, we use the so-called method of applying corporate, which allows you to get a piece of large size, thereby improving performance.

The following describes the method of corpocracy with reference to Fig. 1, 2 and 3. The tube 24 to corporate has a tube 14 retention with a high content of impurities located coaxially at one of its ends. Pipe ring 16 for centering the core preform of the optical fiber and the tube 24 corporate. To this end it is desirable to have the support ring 16 with a thickness of at least 10 mm In Fig. 2 shows the basic workpiece 22 of the optical fiber placed on the tube 24 corporate.

To the lower end of the base of the workpiece 22 of the optical fiber is attached the supporting rod 18, the upper end of which is located at the lower end of tube 24 corporate, heated to education pressurized ball 20, which sealed the bottom end of the tube 24 corporate, as shown in Fig. 1. This team structure long heated while rotating, to melt the tube 24 corporate and the bulk of the workpiece 22 of the optical fiber supporting procurement optical fiber, as shown in Fig. 3. From j.Gower ("Optical communication systems". - M.: Radio and communication, 1989, S. 102, Fig. 4, 6), which is the closest analogue of the invention, the known device and method of manufacturing optical fiber. According to the above operation the device contains a furnace for melting the preform of the optical fiber with the possibility of drawing optical fiber, a device for applying a protective coating, a ratchet for drawing optical fiber from the preform of the optical fiber with the application efforts on pricescope fiber with reference to Fig. 4. The furnace 28 contains a mechanism 35 so that the position of the workpiece. The furnace 28 can operate at a temperature of several thousand degrees Celsius, usually 2100-2200oC. Uncoated optical fiber 36 is drawn from the reduced cross-section part of the auxiliary workpiece 26 of the optical fiber. The tension creates the ratchet 34.

The device 40 measures the diameter of the uncoated optical fiber 36, producing a measuring signal, which is transmitted to the controller 38 diameter, supported diameter size to a specific value, for example, 125 μm. Knob diameter thus controls the tension on the ratchet 34 in response to the measuring signal, in order to maintain the size of the diameter of the uncoated optical fiber 36 to the value of 125 μm. Chilled bare optical fiber 36 cover acrylic or silicon resin as a protective coating the first and second cover 30 and 32. Optical fiber finally the coating is wound on the coil 68, the auxiliary blank optical fiber, perform the application of the outer coating of the primary preform for optical fibres, pull the fiber from the auxiliary zagotovka that prepare the basic preparation of the optical fiber through the internal deposition, perform corporate primary preform for optical fiber for receiving the auxiliary optical fiber preform and, finally, pull the optical fiber of the auxiliary optical fiber preform. These three well-known operations of manufacturing optical fiber takes a long time, which decreases performance. In addition, the operation of corporate primary preform for optical fiber requires a large amount of oxygen or hydrogen. In addition, when increasing the size of the core preform of the optical fiber, the amount of heat transferred to the workpiece, should be increased, thus deteriorating transmission characteristics of the formed optical fiber, such as optical loss.

The technical problem to be solved in the present invention is the development of a device for applying corporate on primary optical fiber preform while simultaneously pulling the optical fiber to final form and method of its manufacture.

According to a particular variant of implementation of the present invention, the device for manufacturing an optical fiber includes: a furnace that is designed to melt the workpiece optical the CSOs fiber, the ratchet for drawing optical fiber from the preform of the optical fiber by the application of tension, the connection device for fastening a primary preform for optical fibres, put on the center tube of corporate, at the same distance in space between the outer surface of the primary preform of the optical fiber and the inner surface of the tube corporate, and the device controlling the position for support of the device connecting to submit the main optical fiber associated with the tube corporate, position controlled by the state.

The invention is further explained by the specific version of it, with reference to the accompanying drawings, in which:

Fig. 1 depicts a longitudinal section of a primary preform for optical fiber mounted coaxially in the famous tube corporate,

Fig. 2 depicts a cross-section of the core preform of the optical fiber shown in Fig. 1,

Fig. 3 depicts a cross-section similar to Fig. 2, in which the famous tube corporate fused with the primary optical fiber preform,

Fig. 4 is a block diagram depicting the known device the fiber according to the present invention,

Fig. 6A, 6B and 6C depict the design of the device connection according to the present invention,

Fig. 7 depicts the operation of education pressurized ball on one end of the primary preform for optical fibers by heating according to the present invention,

Fig. 8 depicts the basic preparation of the optical fiber placed in the tube corporate for the preparation of the auxiliary optical fiber preform using the device connection corresponding to the present invention, and

Fig. 9 depicts the operation of manufacturing the lower end of the auxiliary optical fiber preform, rounded by melting.

Equipment 42 of blank feeding (Fig. 5) includes a tube 44 corporate, the bulk of the workpiece 46 of the optical fiber, the coupling device 47, the mechanism 35 so that the position of the workpiece and the feeder 48 nitrogen gas. Tube 44 corporate has a refractive index of the final coating. When the bulk of the workpiece 46 of the optical fiber is closely combined with the tube corporate in sealed form, the ratio of the diameters of the cross-section of the core and coating 45 : 125. The coupling device 47 designation is esatcom, formed between the side surface of the workpiece 46 and the inner surface of the tube 52 corporate. The mechanism 35 so that the position of the workpiece controls the position of the workpiece 46 of the optical fiber associated with the supplied tube 44 corporate. Feeder 48 nitrogen gas provides a gas flow of nitrogen through the channel formed in the form of a tube in the coupling device 47, to create a vacuum in the gap between the primary workpiece 46 and the tube 44 corporate.

Equipment 50 of drawing optical fiber includes an oven 28, the controller 38 diameter, the first and second cover 30 and 32 and the ratchet 34, similar to that shown in Fig. 1.

In Fig. 6A shows a longitudinal section of the device connection of Fig. 6B is a cross section along the section line X-X, and Fig. 6C - General view. A quartz tube containing impurities, is then used to connect the tube 44 corporate with the coupling device 47 along the length. The main workpiece 46 of the optical fiber is still located along the Central axis of the device connection. The coupling device 47 is made with a circular groove 56, which is connected with a pipe for the intake and exhaust "A" and "B" gas the military parallel to the axis between the tube 44 corporate and the main workpiece 46 of the optical fiber. The nitrogen gas serves in the intake tube a and is removed from the discharge tube, so that the space between the tube 44 corporate and the main workpiece 46 of the optical fiber was created by vacuum suction tube "C" in accordance with the Bernoulli theorem.

In the process of drawing optical fiber (Fig. 5-9) one end of the primary preform 46 of the optical fiber prepared by the internal deposition connected with the first quartz tube containing the impurities, and the connected portion is melted at a temperature of 1400oC when inflated and spherical shape. Then a quartz tube containing impurities, move from the primary optical fiber preform in the end with an inflated ball. The main procurement optical fiber installed in the tube 44 corporate with pressurized end located at the lower end of the tube corporate, as shown in Fig. 8, and the other end still fixed in the center of the device connection, as shown in Fig. 6A. The tube corpocracy containing a primary optical fiber preform, rotate with a speed of 15 revolutions per second, heating the pressurized end located at the lower end of the tube corporate at a temperature of 1400oWith over Tria razreshaetsja to the vacuum state by passing nitrogen gas through a circular groove 56. Then pressurized end of the primary preform for optical fibers and the adjacent end of the tube corporate glued together by fusion to create an auxiliary sealed blanks, consisting of a tube of corporate, and the primary preform for optical fibers.

Supporting the workpiece, thus obtained, is fed into the furnace 28 by means of the mechanism 35 so that the position of the workpiece. When the heating furnace 28 to a temperature of 2350oC and after 15 minutes the space between the primary preform for optical fiber and tube corporate again razreshaetsja to the vacuum state while passing nitrogen gas through a circular groove 56. After 25 minutes the bottom of the oven open, releasing the molten portion of the secondary billet. The molten part of the pull-preserving diameter of not more than 125 μm, cover through the first and second cover 30 and 32 and is connected to the ratchet 34, the exhaust velocity which is automatically adjusted in the range 300 - 700 meters per minute.

Thus, the present invention provides a device corporate primary preform for optical fibers by pulling the optical fiber in its final form and the way technology is of optical fibers, containing a furnace for melting the preform of the optical fiber with the possibility of drawing optical fiber, a device for applying a protective coating, a ratchet for drawing optical fiber from the preform of the optical fiber with the application of tension force, characterized in that it includes a connection device for fastening a primary preform for optical fibres, put in the tube outer covering, and the device management position to support the device connection, intended to supply the primary preform for optical fiber into the tube of the outer coating to the controlling provisions.

2. The device under item 1, characterized in that the coupling device and the tube outer coating is connected with the quartz tube.

3. The device under item 1, characterized in that the coupling device is made with a circular groove which is connected with the pipe inlet and outlet nitrogen gas, performed perpendicular to the axis of the device connection, and with a suction tube that is parallel to the axis in the space between the tube outer cover and the main optical fiber preform.

4. The device under item 1, characterized in that the furnace has a C prepare the basic preparation of the optical fiber through the internal deposition, place the main procurement optical fiber in the tube outer covering, receive supporting the workpiece optical fiber, perform the application of the outer coating of the primary preform for optical fibres, pull the fiber from the auxiliary workpiece, characterized in that connect the main optical fiber preform with a tube outer coating with a device connection, heat up one end of the tube outer coating containing a primary optical fiber preform, to prepare an auxiliary sealed blanks, consisting of a tube of exterior cladding and the primary preform for optical fibers with their adjacent ends, glued together by melting and melt supporting the workpiece in a furnace, thereby simultaneously applying a coating and pulling the optical fiber.

6. The method according to p. 5, characterized in that to accommodate the blanks in the tube outer coating of connect one end of the primary preform for optical fiber with a quartz tube containing impurities, is heated connected part for a specified period of time to form a pressurized parts, quartz move trgralis basic procurement optical fiber in the tube outer cover with one end, connected to the coupling device with the possibility of installing pressurized end to the other end of the tube outer covering, and still establish the core procurement optical fiber along the Central axis of the device connection.

7. The method according to p. 5, wherein when receiving the auxiliary workpiece melt adjacent the ends of the primary preform of the optical fiber and the tube outer coating by heating for a specified time, and the space between the primary preform of the optical fiber and the tube outer coating razrezajut to the state of vacuum through the suction tube, formed in the connection device.

 

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