A processing technology for non-quartz optical fiber cable

Abstract

A processing technology for non-quartz optical fiber cables, including the following steps: fiber curing, tail reinforcement, end face grinding, cleaning and drying, and end face and optical loss detection. The processing technology processes relatively soft and extremely thin diameter new non-quartz optical fibers to form optical cables with MT ferrules. Compared with optical cables made of quartz optical fibers, the optical cables have the advantages of faster transmission speed, larger bandwidth, greater safety, lighter weight, thinner and softer. The optical loss is equivalent to that of quartz optical fiber cables with MT ferrules, and can meet the requirements of multiple scenarios such as connection with the optical path of the PCB board of high-end products or docking of jumpers.

Description

Technical Field

[0001] The invention relates to the technical field of processing non-quartz optical fiber material connectors, and in particular to a processing technology for non-quartz optical fiber cables. Background Art

[0002] With the comprehensive coverage of 4G technology and the large-scale promotion of 5G technology, the rapid development of data center interconnection, fiber optic sensing, and new generation fiber optic technologies, ultra-large capacity, ultra-high speed, and ultra-long distance optical transmission networks will become a prerequisite for the construction of 5G data centers, and the equipment components of optical modules used for carrying are gradually developing in the direction of miniaturization and density. This places higher requirements on the density, miniaturization, and simplification of fiber optic components.

[0003] The mini MT ferrule is an important core of a multi-channel data transmission device. Its volume is more than 50% smaller than that of an ordinary MT ferrule, and it is more compatible with the equipment components of miniaturized and dense optical modules, and has good application prospects in the field of high-density communication connectors. At present, quartz optical fiber has good hardness and is widely used in mini MT ferrules because of its low insertion loss rate. Therefore, the existing mini MT ferrules basically use quartz optical fiber. However, the transmission speed of quartz optical fiber is slow, and its transmission speed in the field of high-speed communication cannot be compared with that of new non-quartz optical fibers. Therefore, it has certain limitations in the application of high-speed communication, and due to its heavy weight, it is difficult to meet the application requirements of lightweight environments.

[0004] The new non-quartz optical fiber has the advantages of faster transmission speed, larger bandwidth, greater safety, lighter weight, thinner and softer. It can reduce the environmental load of big data and is more suitable for precision medical equipment, unmanned driving, robots, artificial intelligence, lightweight drones, virtual realization, smart houses and other fields. However, the new non-quartz optical fiber is softer and thinner than quartz optical fiber. It is easy to cause bending of the optical fiber material during processing, which will cause fatal damage to the characteristics and performance of the optical fiber material, and it is easy to cause the optical fiber material to break, which will cause a series of problems such as increased insertion loss and large connector loss. As a result, the new non-quartz optical fiber with a relatively soft material is difficult to be used in mini MT ferrules. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a processing technology for non-quartz optical fiber cables, which processes relatively soft and extremely thin new non-quartz optical fibers to form optical cables with MT ferrules. Compared with optical cables made of quartz optical fibers, the optical cables have the advantages of faster transmission speed, larger bandwidth, greater safety, lighter weight, thinner and softer, and the optical loss is equivalent to that of quartz optical fiber cables with MT ferrules.

[0006] The object of the present invention is achieved by the following technical solution: A processing technology for non-quartz optical fiber cable comprises the following steps:

[0007] S1. Outer sheath stripping: Use a wire stripping machine to remove the outer sheath of the optical cable without damaging the internal copper wire and optical fiber.

[0008] S2. Processing of braided copper wires: retain several copper wires, twist the retained copper wires with the ground wire, and bend the copper wires to keep them as far away from the bare fiber bundle as possible.

[0009] S3, Optical fiber sheath removal: Cut off the optical fiber sheath and peel it off to expose the bare fiber, cut off the bulletproof wire, and obtain the bare fiber bundle.

[0010] S4, fiber insertion and curing: Cut the end face of the bare fiber bundle flat, insert the bare fiber bundle into the fiber channel hole of the MT ferrule and protrude outside the fiber channel hole, then inject shaping glue into the fiber channel hole and fill the fiber channel hole with shaping glue, and place the MT ferrule in a curing furnace for curing.

[0011] S5, Tail reinforcement: Apply reinforcing glue to the rear end of the MT ferrule and wrap the exposed bare fiber bundle with the cured reinforcing glue.

[0012] S6, end face grinding: After cutting off the bare fiber bundle protruding outside the optical fiber channel hole of the MT ferrule, the MT ferrule is placed on a central pressure grinder for end face grinding. The grinding process includes: rough grinding, primary fine grinding, secondary fine grinding and polishing grinding.

[0013] S7, cleaning and drying: remove the MT ferrule that has been polished in S6 and clean it in an ultrasonic cleaner, then use a blower to dry any remaining moisture under vacuum conditions.

[0014] S8, end face and optical loss inspection: Place the MT ferrule in the end face inspection instrument to check the end face grinding effect of the MT ferrule, and then use the optical power meter to perform optical loss test on the MT ferrule with qualified end face. The MT ferrule that passes the test is qualified.

[0015] In step S2 of the present application, 7 copper wires are preferably retained and twisted together with the ground wire to ensure that the resistance of the optical cable meets the requirements. The twisted copper wires are reversely bent and bundled outside the cable sheath, thereby exposing the optical fiber sheath.

[0016] The length of the outer sheath removed from the end of the optical cable in step S1 is 28-32 mm, and the length of the outer sheath stripped from the optical fiber in step S3 is 26-30 mm.

[0017] When the bulletproof wire is cut off in step S3, it needs to be cut off in the blowing environment of the ion blower to avoid static electricity remaining in the bare fiber bundle and affecting the normal insertion of the bare fiber bundle into the optical fiber channel hole.

[0018] The shaping glue described in step S4 is 353ND glue. This application uses 353ND glue produced by the American epoxytechnology company. This glue can be cured by heat curing, and has excellent high temperature resistance after curing, so that the MT ferrule of this application can be used normally and work continuously in an ambient temperature of 200°C, and can keep the bare fiber bundle structure in the optical fiber channel hole stable for a long time without loosening, thereby ensuring the stability of the bare fiber bundle end face structure, thereby ensuring that the end face structure of the MT ferrule always remains stable, and there will be no change in the bare fiber bundle end face structure causing the optical loss rate of the MT ferrule to increase significantly.

[0019] In step S4, the curing temperature of the curing furnace is 78-82° C., and the curing time is 38-42 minutes. During the curing process, the MT ferrule needs to be suspended in the air to avoid being damaged by touching the inner wall of the curing furnace, thereby preventing the bare fiber bundle from being damaged.

[0020] The reinforcing glue in step S5 is 3M epoxy resin glue DP460NS.

[0021] In step S5 of the present application, 3M epoxy resin glue DP460NS is coated on the rear end face of the MT ferrule and gradually wraps the bare fiber bundle, and is cured between the exposed bare fiber bundle and the rear end face of the MT ferrule to form a potting structure similar to a potting glue. The cured 3M epoxy resin glue DP460NS potting structure has good flexibility and corrosion resistance, and has excellent bonding strength, which can provide good flexible support for the exposed bare fiber bundle, while improving the tensile and bending strength of the exposed bare fiber bundle, reducing optical loss, facilitating subsequent process operations, and improving the yield rate.

[0022] The rough grinding conditions in step S6 are: using grinding paper with a coarseness of SC16, grinding time of 60-100S, rotation speed of 30-60rpm, and the grinding pressure on the end face of the MT ferrule is: 2-3kg / cm2.

[0023] The conditions for the primary fine grinding in step S6 are: using grinding paper with a coarseness of SC9, grinding time of 60-100 seconds, rotation speed of 30-60 rpm, and grinding pressure on the end face of the MT ferrule of 2-3 kg / cm2.

[0024] The secondary fine grinding conditions in step S6 are: using grinding paper with a coarseness of SC3, grinding time of 60-100S, rotation speed of 30-60rpm, and grinding pressure of 1-2kg / cm2 on the end face of the MT ferrule.

[0025] The polishing in step S6 is as follows: the polishing material is a black cloth coated with a polishing liquid, the polishing time is 60-100 seconds, the rotation speed is 30-60 rpm, and the polishing pressure on the end face of the MT ferrule is 1-2 kg / cm2.

[0026] The grinding paper is silicon carbide grinding paper.

[0027] In step S7, the frequency of the ultrasonic cleaning machine is 38-42 KHZ, the cleaning time is 38-42 s, the vacuum degree is 0.3 Mpa, and the drying time is controlled at 40-45 s.

[0028] The optical power meter is a FLUKE optical power meter.

[0029] The beneficial effects of the present invention are as follows: the processing technology of the present invention processes a relatively soft and extremely thin new non-quartz optical fiber to form an optical cable with an MT ferrule. Compared with an optical cable made of quartz optical fiber, the optical cable has the advantages of faster transmission speed, larger bandwidth, greater safety, lighter weight, thinner and softer. The optical loss is equivalent to that of a quartz optical fiber cable with an MT ferrule, and can effectively meet the needs of the high-speed communication field, such as the high-density and high-speed communication needs in the fields of precision medical equipment, unmanned driving, robots, artificial intelligence, lightweight drones, virtual realization, smart houses, etc., and solves the problem of the existing new non-quartz optical fiber due to its hardness. The optical fiber is easy to break, the insertion loss is large, the connector loss is large, the quality is poor, and the efficiency is low when it is used in the connector. The optical loss of the equal-length optical cable with the new non-quartz optical fiber and MT ferrule of the present application produced by the existing processing technology is 6-8db, and the optical loss of the new non-quartz optical fiber cable with MT ferrule produced by the processing technology of the present application is between 0.3-0.7db, which is equivalent to the optical loss of the quartz optical fiber cable with MT ferrule. The efficiency and quality can reach the level of quartz optical fiber, and can meet the use requirements of multiple scenarios such as connection with the PCB board optical path of high-end products or docking of jumpers. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1 The present invention is further described, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0032] Example 1

[0033] A processing technology for non-quartz optical fiber cable comprises the following steps:

[0034] S1. Outer sheath stripping: Use a wire stripping machine to remove the outer sheath of the optical cable without damaging the internal copper wire and optical fiber.

[0035] S2. Processing of braided copper wires: retain 7 copper wires, twist the retained copper wires with the ground wire, and bend the copper wires to keep them as far away from the bare fiber bundle as possible.

[0036] S3, Optical fiber sheath removal: Cut off the optical fiber sheath and peel it off to expose the bare fiber, cut off the bulletproof wire, and obtain the bare fiber bundle.

[0037] S4, fiber insertion and curing: Cut the end face of the bare fiber bundle flat, insert the bare fiber bundle into the fiber channel hole of the MT ferrule and protrude outside the fiber channel hole, then inject shaping glue into the fiber channel hole and fill the fiber channel hole with shaping glue, and place the MT ferrule in a curing furnace for curing.

[0038] S5, Tail reinforcement: Apply reinforcing glue to the rear end of the MT ferrule and wrap the exposed bare fiber bundle with the cured reinforcing glue.

[0039] S6, end face grinding: After cutting off the bare fiber bundle protruding outside the optical fiber channel hole of the MT ferrule, the MT ferrule is placed on a central pressure grinder for end face grinding. The grinding process includes: rough grinding, primary fine grinding, secondary fine grinding and polishing grinding.

[0040] S7, cleaning and drying: remove the MT ferrule that has been polished in S6 and clean it in an ultrasonic cleaner, then use a blower to dry any remaining moisture under vacuum conditions.

[0041] S8, end face and optical loss inspection: Place the MT ferrule in the end face inspection instrument to check the end face grinding effect of the MT ferrule, and then use the optical power meter to perform optical loss test on the MT ferrule with qualified end face. The MT ferrule that passes the test is qualified.

[0042] In step S2 of the present application, 7 copper wires are retained and twisted together with the ground wire to ensure that the resistance of the optical cable meets the requirements. The twisted copper wires are reversely bent and bundled outside the cable sheath, thereby exposing the optical fiber sheath.

[0043] The length of the outer sheath removed from the end of the optical cable in step S1 is 32 mm, and the length of the outer sheath stripped from the optical fiber in step S3 is 30 mm.

[0044] When the bulletproof wire is cut off in step S3, it needs to be cut off in the blowing environment of the ion blower to avoid static electricity remaining in the bare fiber bundle and affecting the normal insertion of the bare fiber bundle into the optical fiber channel hole.

[0045] The shaping glue described in step S4 is 353ND glue. This application uses 353ND glue produced by the American epoxytechnology company.

[0046] In step S4, the curing temperature of the curing furnace is 82° C., and the curing time is 42 minutes. During the curing process, the MT ferrule needs to be suspended in the air to avoid being damaged by touching the inner wall of the curing furnace, thereby preventing the bare fiber bundle from being damaged.

[0047] The reinforcing glue in step S5 is 3M epoxy resin glue DP460NS.

[0048] The rough grinding conditions in step S6 are: using grinding paper with a coarseness of SC16, grinding time of 100 seconds, rotation speed of 60 rpm, and the grinding pressure on the end face of the MT ferrule is: 3 kg / cm2.

[0049] Specifically, the MT ferrule is fixed to a circular grinding disc fixture, the grinding paper is fixed to a turntable, the end face of the MT ferrule is in contact with the grinding paper, the turntable applies pressure to the end face of the MT ferrule and rotates to grind the end face of the MT ferrule. After each rotation of 10S, the turntable rotates in the opposite direction for 10S for grinding, and this process is repeated. The above-mentioned rough grinding process can remove the residual shaping glue on the end face of the bare fiber bundle.

[0050] The conditions for the primary fine grinding in step S6 are: using grinding paper with a coarseness of SC9, grinding time of 100 seconds, rotation speed of 60 rpm, and the grinding pressure on the end face of the MT ferrule is 3 kg / cm2.

[0051] The secondary fine grinding conditions in step S6 are: using grinding paper with a coarseness of SC3, grinding time of 100S, rotation speed of 60rpm, and the grinding pressure on the end face of the MT ferrule is: 2kg / cm2.

[0052] Specifically, during the first fine grinding and the second fine grinding, the MT ferrule is fixed to a circular grinding disc fixture, the grinding paper is fixed to a turntable, the end face of the MT ferrule is in contact with the grinding paper, the turntable applies pressure to the end face of the MT ferrule and rotates to grind the end face of the MT ferrule. After each rotation of 10S, the turntable rotates in the opposite direction for 10S for grinding, and repeats this process. This grinding method can form a uniform guide angle at the edge of the bare fiber bundle, improve the surface flatness of the end face of the bare fiber bundle, and keep the protruding height of each part of the protruding end face of the bare fiber bundle consistent, thereby reducing the insertion loss of the optical cable and thus reducing the optical loss.

[0053] The polishing in step S6 is as follows: the polishing material is a black cloth coated with a polishing liquid, the polishing time is 100 seconds, the rotation speed is 60 rpm, and the polishing pressure on the end face of the MT ferrule is 2 kg / cm2.

[0054] Specifically, during polishing, the MT ferrule is fixed to a circular grinding disc fixture, a black cloth coated with polishing liquid is fixed to a turntable, the end face of the MT ferrule is in contact with the black cloth, the turntable applies pressure to the end face of the MT ferrule and rotates to polish the end face of the MT ferrule. After each rotation of 5S, the turntable rotates in the opposite direction for 5S to continue polishing, and so on. This polishing method can keep the end face flatness of the bare fiber bundle uniform, improve the surface flatness of the end face of the bare fiber bundle, and keep the protruding height of each part of the protruding end face of the bare fiber bundle consistent, thereby reducing the insertion loss of the optical cable and thus reducing the optical loss.

[0055] The grinding paper is silicon carbide grinding paper.

[0056] In step S7, the frequency of the ultrasonic cleaning machine is 42KHZ, the cleaning time is 42s, the vacuum degree is 0.3Mpa, and the drying time is controlled at 45s.

[0057] The optical power meter is a FLUKE optical power meter.

[0058] Example 2

[0059] A processing technology for non-quartz optical fiber cable comprises the following steps:

[0060] S1. Outer sheath stripping: Use a wire stripping machine to remove the outer sheath of the optical cable without damaging the internal copper wire and optical fiber.

[0061] S2. Processing of braided copper wires: retain 7 copper wires, twist the retained copper wires with the ground wire, and bend the copper wires to keep them as far away from the bare fiber bundle as possible.

[0062] S3, Optical fiber sheath removal: Cut off the optical fiber sheath and peel it off to expose the bare fiber, cut off the bulletproof wire, and obtain the bare fiber bundle.

[0063] S4, fiber insertion and curing: Cut the end face of the bare fiber bundle flat, insert the bare fiber bundle into the fiber channel hole of the MT ferrule and protrude outside the fiber channel hole, then inject shaping glue into the fiber channel hole and fill the fiber channel hole with shaping glue, and place the MT ferrule in a curing furnace for curing.

[0064] S5, Tail reinforcement: Apply reinforcing glue to the rear end of the MT ferrule and wrap the exposed bare fiber bundle with the cured reinforcing glue.

[0065] S6, end face grinding: After cutting off the bare fiber bundle protruding outside the optical fiber channel hole of the MT ferrule, the MT ferrule is placed on a central pressure grinder for end face grinding. The grinding process includes: rough grinding, primary fine grinding, secondary fine grinding and polishing grinding.

[0066] S7, cleaning and drying: remove the MT ferrule that has been polished in S6 and clean it in an ultrasonic cleaner, then use a blower to dry any remaining moisture under vacuum conditions.

[0067] S8, end face and optical loss inspection: Place the MT ferrule in the end face inspection instrument to check the end face grinding effect of the MT ferrule, and then use the optical power meter to perform optical loss test on the MT ferrule with qualified end face. The MT ferrule that passes the test is qualified.

[0068] In step S2 of the present application, 7 copper wires are retained and twisted together with the ground wire to ensure that the resistance of the optical cable meets the requirements. The twisted copper wires are reversely bent and bundled outside the cable sheath, thereby exposing the optical fiber sheath.

[0069] The length of the outer sheath removed from the end of the optical cable in step S1 is 30 mm, and the length of the outer sheath stripped from the optical fiber in step S3 is 28 mm.

[0070] When the bulletproof wire is cut off in step S3, it needs to be cut off in the blowing environment of the ion blower to avoid static electricity remaining in the bare fiber bundle and affecting the normal insertion of the bare fiber bundle into the optical fiber channel hole.

[0071] The shaping glue described in step S4 is 353ND glue. This application uses 353ND glue produced by the American epoxytechnology company.

[0072] In step S4, the curing temperature of the curing furnace is 80° C., and the curing time is 40 minutes. During the curing process, the MT ferrule needs to be suspended in the air to avoid being damaged by touching the inner wall of the curing furnace, thereby preventing the bare fiber bundle from being damaged.

[0073] The reinforcing glue in step S5 is 3M epoxy resin glue DP460NS.

[0074] The rough grinding conditions in step S6 are: using grinding paper with a coarseness of SC16, grinding time of 80 seconds, rotation speed of 45 rpm, and the grinding pressure on the end face of the MT ferrule is: 2.5 kg / cm2.

[0075] Specifically, the MT ferrule is fixed to a circular grinding disc fixture, the grinding paper is fixed to a turntable, the end face of the MT ferrule is in contact with the grinding paper, the turntable applies pressure to the end face of the MT ferrule and rotates to grind the end face of the MT ferrule. After each rotation of 10S, the turntable rotates in the opposite direction for 10S for grinding, and this process is repeated. The above-mentioned rough grinding process can remove the residual shaping glue on the end face of the bare fiber bundle.

[0076] The conditions for the primary fine grinding in step S6 are: using grinding paper with a coarseness of SC9, grinding time of 80 seconds, rotation speed of 45 rpm, and the grinding pressure on the end face of the MT ferrule is: 2.5 kg / cm2.

[0077] The secondary fine grinding conditions in step S6 are: using grinding paper with a coarseness of SC3, grinding time of 80S, rotation speed of 45rpm, and the grinding pressure on the end face of the MT ferrule is: 1.5kg / cm2.

[0078] Specifically, during the first fine grinding and the second fine grinding, the MT ferrule is fixed to a circular grinding disc fixture, the grinding paper is fixed to a turntable, the end face of the MT ferrule is in contact with the grinding paper, the turntable applies pressure to the end face of the MT ferrule and rotates to grind the end face of the MT ferrule. After each rotation of 10S, the turntable rotates in the opposite direction for 10S for grinding, and repeats this process. This grinding method can form a uniform guide angle at the edge of the bare fiber bundle, improve the surface flatness of the end face of the bare fiber bundle, and keep the protruding height of each part of the protruding end face of the bare fiber bundle consistent, thereby reducing the insertion loss of the optical cable and thus reducing the optical loss.

[0079] The polishing in step S6 is as follows: the polishing material is a black cloth coated with a polishing liquid, the polishing time is 80 seconds, the rotation speed is 45 rpm, and the polishing pressure on the end face of the MT ferrule is 1.5 kg / cm2.

[0080] Specifically, during polishing, the MT ferrule is fixed to a circular grinding disc fixture, a black cloth coated with polishing liquid is fixed to a turntable, the end face of the MT ferrule is in contact with the black cloth, the turntable applies pressure to the end face of the MT ferrule and rotates to polish the end face of the MT ferrule. After each rotation of 5S, the turntable rotates in the opposite direction for 5S to continue polishing, and so on. This polishing method can keep the end face flatness of the bare fiber bundle uniform, improve the surface flatness of the end face of the bare fiber bundle, and keep the protruding height of each part of the protruding end face of the bare fiber bundle consistent, thereby reducing the insertion loss of the optical cable and thus reducing the optical loss.

[0081] The grinding paper is silicon carbide grinding paper.

[0082] In step S7, the frequency of the ultrasonic cleaning machine is 40KHZ, the cleaning time is 40s, the vacuum degree is 0.3Mpa, and the drying time is controlled at 43s.

[0083] The optical power meter is a FLUKE optical power meter.

[0084] Example 3

[0085] A processing technology for non-quartz optical fiber cable comprises the following steps:

[0086] S1. Outer sheath stripping: Use a wire stripping machine to remove the outer sheath of the optical cable without damaging the internal copper wire and optical fiber.

[0087] S2. Processing of braided copper wires: retain 7 copper wires, twist the retained copper wires with the ground wire, and bend the copper wires to keep them as far away from the bare fiber bundle as possible.

[0088] S3, Optical fiber sheath removal: Cut off the optical fiber sheath and peel it off to expose the bare fiber, cut off the bulletproof wire, and obtain the bare fiber bundle.

[0089] S4, fiber insertion and curing: Cut the end face of the bare fiber bundle flat, insert the bare fiber bundle into the fiber channel hole of the MT ferrule and protrude outside the fiber channel hole, then inject shaping glue into the fiber channel hole and fill the fiber channel hole with shaping glue, and place the MT ferrule in a curing furnace for curing.

[0090] S5, Tail reinforcement: Apply reinforcing glue to the rear end of the MT ferrule and wrap the exposed bare fiber bundle with the cured reinforcing glue.

[0091] S6, end face grinding: After cutting off the bare fiber bundle protruding outside the optical fiber channel hole of the MT ferrule, the MT ferrule is placed on a central pressure grinder for end face grinding. The grinding process includes: rough grinding, primary fine grinding, secondary fine grinding and polishing grinding.

[0092] S7, cleaning and drying: remove the MT ferrule that has been polished in S6 and clean it in an ultrasonic cleaner, then use a blower to dry any remaining moisture under vacuum conditions.

[0093] S8, end face and optical loss inspection: Place the MT ferrule in the end face inspection instrument to check the end face grinding effect of the MT ferrule, and then use the optical power meter to perform optical loss test on the MT ferrule with qualified end face. The MT ferrule that passes the test is qualified.

[0094] In step S2 of the present application, 7 copper wires are retained and twisted together with the ground wire to ensure that the resistance of the optical cable meets the requirements. The twisted copper wires are reversely bent and bundled outside the cable sheath, thereby exposing the optical fiber sheath.

[0095] The length of the outer sheath removed from the end of the optical cable in step S1 is 28 mm, and the length of the outer sheath stripped from the optical fiber in step S3 is 26 mm.

[0096] When the bulletproof wire is cut off in step S3, it needs to be cut off in the blowing environment of the ion blower to avoid static electricity remaining in the bare fiber bundle and affecting the normal insertion of the bare fiber bundle into the optical fiber channel hole.

[0097] The shaping glue described in step S4 is 353ND glue. This application uses 353ND glue produced by the American epoxytechnology company.

[0098] In step S4, the curing temperature of the curing furnace is 78° C., and the curing time is 38 minutes. During the curing process, the MT ferrule needs to be suspended in the air to avoid being damaged by touching the inner wall of the curing furnace, thereby preventing the bare fiber bundle from being damaged.

[0099] The reinforcing glue in step S5 is 3M epoxy resin glue DP460NS.

[0100] The rough grinding conditions in step S6 are: using grinding paper with a coarseness of SC16, grinding time of 60 seconds, rotation speed of 30 rpm, and the grinding pressure on the end face of the MT ferrule is: 2 kg / cm2.

[0101] The conditions for the primary fine grinding in step S6 are: using grinding paper with a coarseness of SC9, grinding time of 60 seconds, rotation speed of 30 rpm, and the grinding pressure on the end face of the MT ferrule is 2 kg / cm2.

[0102] The secondary fine grinding conditions in step S6 are: using grinding paper with a coarseness of SC3, grinding time of 60S, rotation speed of 30rpm, and the grinding pressure on the end face of the MT ferrule is: 1kg / cm2.

[0103] The polishing in step S6 is as follows: the polishing material is a black cloth coated with a polishing liquid, the polishing time is 60 seconds, the rotation speed is 30 rpm, and the polishing pressure on the end face of the MT ferrule is 1 kg / cm2.

[0104] The grinding paper is silicon carbide grinding paper.

[0105] In the step S7, the frequency of the ultrasonic cleaning machine is 38KHZ, the cleaning time is 38s, the vacuum degree is 0.3Mpa, and the drying time is controlled at 40s.

[0106] The optical power meter is a FLUKE optical power meter.

[0107] The qualified products of Examples 1 to 3 of the present application were tested for optical loss using a FLUKE optical power meter. At the same time, a control product produced using quartz optical fiber and having the same structure and length as the qualified products of the present application was tested for optical loss using a FLUKE optical power meter and the results were recorded in the table below.

[0108] Among them, CH1, CH2, CH3 and CH4 are different analog input channels of the oscilloscope.

[0109] Products CH1 CH2 CH3 CH4 Example 1 0.68 0.63 0.54 0.48 Example 2 0.55 0.44 0.38 0.36 Example 3 0.58 0.48 0.54 0.53 Reference 0.53 0.39 0.47 0.42

[0110] It can be seen from the test results on the upper surface that the optical loss of the new non-quartz optical fiber cable with MT ferrule of the present application is between 0.3-0.7db, which is equivalent to the optical loss of quartz optical fiber cable with MT ferrule. The efficiency and quality can reach the level of quartz optical fiber, and can meet the use requirements of multiple scenarios such as connection with the PCB board optical path of high-end products or docking of jumpers. At the same time, it can effectively meet the needs of the high-speed communication field, such as high-density and high-speed communication needs in the fields of precision medical equipment, unmanned driving, robots, artificial intelligence, lightweight drones, virtual realization, smart houses, etc.

[0111] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A processing technology for non-quartz optical fiber cable, characterized in that: The following steps are involved: S4, fiber insertion and curing: Cut the end face of the bare fiber bundle flat, insert the bare fiber bundle into the fiber channel hole of the MT ferrule and protrude outside the fiber channel hole, then inject shaping glue into the fiber channel hole and fill the fiber channel hole with shaping glue, and place the MT ferrule in a curing furnace for curing. S5, Tail reinforcement: Apply reinforcing glue to the rear end of the MT ferrule and wrap the exposed bare fiber bundle with the cured reinforcing glue. S6, end face grinding: After cutting off the bare fiber bundle protruding outside the optical fiber channel hole of the MT ferrule, the MT ferrule is placed on a central pressure grinder for end face grinding. The grinding process includes: rough grinding, primary fine grinding, secondary fine grinding and polishing grinding. S7, cleaning and drying: remove the MT ferrule that has been polished in S6 and clean it in an ultrasonic cleaner, then use a blower to dry any remaining moisture under vacuum conditions. S8, end face and optical loss inspection: Place the MT ferrule in an end face inspection instrument to check the end face grinding effect of the MT ferrule, and then use an optical power meter to perform an optical loss test on the MT ferrule with qualified end faces. The MT ferrule that passes the test is qualified. The rough grinding conditions in step S6 are: using grinding paper with a coarseness of SC16, grinding time of 60-100S, rotation speed of 30-60rpm, and grinding pressure of 2-3kg / cm2 on the end face of the MT ferrule. 2 , fix the MT ferrule on the circular grinding disc fixture, fix the grinding paper on the turntable, the end face of the MT ferrule is in contact with the grinding paper, the turntable applies pressure to the end face of the MT ferrule and rotates to grind the end face of the MT ferrule. After each rotation of 10S, the turntable rotates in the opposite direction for 10S for grinding, and repeats this process. The conditions for the first fine grinding in step S6 are: using grinding paper with a coarseness of SC9, grinding time of 60-100S, rotation speed of 30-60rpm, and grinding pressure of 2-3kg / cm2 on the end face of the MT ferrule. 2 ; The secondary fine grinding conditions in step S6 are: using grinding paper with a coarseness of SC3, grinding time of 60-100S, rotation speed of 30-60rpm, and grinding pressure of 1-2kg / cm 2 ; During the first and second fine grinding, the MT ferrule is fixed to the circular grinding disc fixture, the grinding paper is fixed to the turntable, the end face of the MT ferrule is in contact with the grinding paper, the turntable applies pressure to the end face of the MT ferrule and rotates to grind the end face of the MT ferrule. After each rotation of 10 seconds, the turntable rotates in the opposite direction for 10 seconds for grinding, and repeats this process. The polishing process in step S6 is as follows: the polishing material is a black cloth coated with a polishing liquid, the polishing time is 60-100 seconds, the rotation speed is 30-60 rpm, and the polishing pressure on the end face of the MT ferrule is 1-2 kg / cm 2 ; During polishing, the MT ferrule is fixed to a circular grinding disc fixture, and a black cloth coated with polishing liquid is fixed to a turntable. The end face of the MT ferrule is in contact with the black cloth. The turntable applies pressure to the end face of the MT ferrule and rotates to polish the end face of the MT ferrule. After each 5S rotation of the turntable, it rotates in the opposite direction for 5S to continue polishing, and repeats this process.

2. The processing technology of a non-quartz optical fiber cable according to claim 1, characterized in that: In the step Before step S4, the following steps are also included: S1. Outer sheath stripping: Use a wire stripping machine to remove the outer sheath of the optical cable end without damaging the internal copper wire and optical fiber, S2. Braided copper wire processing: retain several copper wires, twist the retained copper wires with the ground wire, and bend the copper wires to keep them as far away from the bare fiber bundle as possible, S3. Optical fiber outer sheath removal: cut off the optical fiber outer sheath and strip it to expose the bare fiber, cut off the bulletproof wire, and obtain a bare fiber bundle.

3. The processing technology of a non-quartz optical fiber cable according to claim 2, characterized in that: The steps When cutting the bulletproof yarn in S3, it needs to be cut in the blowing environment of the ion blower to avoid static electricity remaining in the bare fiber bundle.

4. The processing technology of a non-quartz optical fiber cable according to claim 2, characterized in that: The length of the outer sheath removed from the end of the optical cable in step S1 is 28-32 mm, and the length of the outer sheath stripped from the optical fiber in step S3 is 26-30 mm.

5. The processing technology of a non-quartz optical fiber cable according to claim 1, characterized in that: In step S4, the curing temperature of the curing furnace is 78-82° C., and the curing time is 38-42 minutes. During the curing process, the MT ferrule needs to be suspended in the air to avoid touching the inner wall of the curing furnace and being damaged.

6. The processing technology of a non-quartz optical fiber cable according to claim 1, characterized in that: The shaping glue in step S4 is 353ND glue, and the reinforcing glue in step S5 is 3M epoxy resin glue.

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