200-micron small-fiber-diameter optical fiber composite overhead ground wire

Abstract

The utility model discloses a 200-micron small-fiber-diameter optical fiber composite overhead ground wire, which comprises a central aluminum-clad steel monofilament, an inner stranded wire layer stranded outside the central aluminum-clad steel monofilament and an outer stranded wire layer stranded outside the inner stranded wire layer, a conductive unit of the outermost outer stranded wire layer is formed by the aluminum-clad steel monofilament, and a conductive unit of the outermost outer stranded wire layer is formed by the aluminum-clad steel monofilament. The optical unit comprises a loose tube with the diameter of 3.0 mm and 36 small-fiber-diameter optical fibers arranged in the loose tube, the diameter of each small-fiber-diameter optical fiber is 200 microns, so that the requirements of small diameter, large capacity, economical efficiency, stability, reliability and the like of a current power transmission line are met, and materials adopted by the 200-micron small-fiber-diameter optical fibers are the same as those adopted by 250-micron optical fibers in the current industrial standard. Through the mode, the size and the weight of the optical cable are effectively reduced, the optical cable is more suitable for micro cables and miniature optical cables, the cost in optical fiber and optical cable configuration and the system cost are effectively reduced, and the optical cable is more suitable for being applied to miniature optical fiber devices.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber composite overhead ground wires, in particular to an optical fiber composite overhead ground wire with a small fiber diameter of 200 microns. Background Art

[0002] At present, loose tube optical cables are mostly used in China. Loose tube optical cables have always dominated in providing mechanical properties, thermal properties and environmental durability to ensure the optical performance required in harsh aerial and underground applications. However, users still require reducing the size and weight of these optical cables to obtain higher light density in duct systems and joint boxes, install more optical cables and reduce the support strength required for overhead applications.

[0003] The smaller and softer the loose tube, the greater the benefit to the user. Smaller loose tubes have a smaller bend radius, a larger storage capacity in manholes, handholes and joint boxes, and increased flexibility. Advanced bend-insensitive G.652D optical fiber also has lower bend sensitivity and a smaller bend radius during processing and storage. Therefore, how to develop the next generation of 200-micron small-diameter optical fiber is urgent. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a 200-micron small-diameter optical fiber composite overhead ground wire, which effectively reduces the size and weight of the optical cable, is more suitable for micro cables and miniaturized optical cables, effectively reduces the cost and system cost in the configuration of optical fibers and optical cables, and is more suitable for application in miniaturized optical fiber devices.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a 200-micron small-diameter optical fiber composite overhead ground wire, the 200-micron small-diameter optical fiber composite overhead ground wire includes a central aluminum-clad steel monofilament, an inner twisted wire layer twisted outside the central aluminum-clad steel monofilament, and an outer twisted wire layer twisted outside the inner twisted wire layer, the inner twisted wire layer is formed by twisting one or more optical units, the optical unit includes a loose tube and a plurality of small-diameter optical fibers arranged in the loose tube; the small-diameter optical fiber has a diameter of 200 microns to meet the requirements of small diameter, large capacity, economy, stability and reliability of today's power transmission lines. The material used for the 200-micron small-diameter optical fiber is the same as the current industry standard 250μm optical fiber, and the conductive unit of the outer twisted wire layer is composed of aluminum-clad steel monofilament.

[0006] Preferably, the small-diameter optical fiber includes a core located at the center of the optical fiber, a cladding surrounding the core and having a lower refractive index than the core, and a coating surrounding the cladding.

[0007] Preferably, the loose tube has a diameter of 3.0 mm and contains 36 small-diameter optical fibers.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] By utilizing the variability of the loose tube structure, we innovate the size of the optical fiber diameter and achieve a transition from 250μm to 200μm, while retaining the same optical parameters as traditional optical fibers, such as mode field diameter and cutoff wavelength, and inheriting the original advantages of ITU-T G652D. Generally speaking, our optical fiber must meet the requirement of 0.6% excess length, and under the condition of meeting the excess length, the capacity expansion of the optical fiber can be achieved.

[0010] It effectively reduces the size and weight of optical cables, and is more suitable for micro cables and miniaturized optical cables. It effectively reduces the cost and system cost in the configuration of optical fibers and optical cables, and is more suitable for applications in miniaturized optical fiber devices. It is compatible with stripping and docking equipment for 250μm outer diameter optical fibers. It has similar fusion splicing settings to G.652 optical fibers, full-band optimization, from O-band to L-band, and is compatible with future optical fiber transmission systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of a 200-micron small-diameter optical fiber composite overhead ground wire.

[0012] Figure 2 Schematic diagram of 200-micron small-diameter optical fiber.

[0013] Among them, 1. central aluminum-clad steel monofilament, 2. inner twisted wire layer, 21. loose tube, 22. small fiber diameter optical fiber, 221. core, 222. cladding, 223. coating, 3. outer twisted wire layer. DETAILED DESCRIPTION

[0014] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0015] See also Figure 1 and Figure 2 , the utility model embodiment includes:

[0016] A 200-micron small-fiber-diameter optical fiber composite overhead ground wire, the 200-micron small-fiber-diameter optical fiber composite overhead ground wire comprising a central aluminum-clad steel monofilament 1, an inner twisted wire layer 2 twisted outside the central aluminum-clad steel monofilament 1, and an outer twisted wire layer 3 twisted outside the inner twisted wire layer 2, the inner twisted wire layer 2 is formed by twisting one or more optical units, the optical unit comprises a loose tube 21 and a small-fiber-diameter optical fiber 22 arranged in the loose tube 21, the loose tube 21 has a diameter of 3.0 mm, the small-fiber-diameter optical fiber 22 has a diameter of 200 microns, 36 small-fiber-diameter optical fibers 22 are arranged in the loose tube 21, and the conductive unit of the outer twisted wire layer 3 is composed of aluminum-clad steel monofilaments.

[0017] The small-diameter optical fiber 22 includes a core 221 located at the center of the optical fiber, a cladding 222 surrounding the core 221 and having a lower refractive index than the core, and a coating 223 surrounding the cladding 222 .

[0018] Table 1 below compares the diameters of 200 micron small diameter optical fibers and conventional optical fibers:

[0019] Table 1

[0020] characteristic Light unit diameter (sus) Number of cores (F) Yu Chang Conventional 250μm optical fiber 3.0mm 24 cores 0.6％ Small diameter 200μm optical fiber 3.0mm 36 cores 0.6％

[0021] The difficulty that needs to be overcome is first of all to meet the excess length. Generally, the excess length of optical fiber should be ≥ 0.6%, which limits the capacity expansion limit, such as the comparison of the number of optical fiber cores with the same diameter that meets the excess length.

[0022] The utility model has certain restrictions on the quality of optical fiber when designing the capacity-increasing optical fiber overhead line. It is necessary to select an optical fiber with a diameter as close to 200μm as possible to meet the small diameter, large capacity, economy, stability and reliability of today's power transmission lines. A small diameter loose tube series is used, which is the loose tube optical cable with the widest range of optical fiber cores in the industry so far. This optical cable design includes 200μm outer diameter optical fiber and loose tube, etc. The material used for the loose tube is the same as the current industry standard 250μm loose tube, and can be widely used in today's old line expansion and reconstruction projects.

[0023] The smaller and lighter the cables in these applications, the more fiber can be placed in the distribution space. This advantage benefits users in many ways, such as reducing the space required to add fiber to existing lines, reducing the strength of the supporting structure required when winding lightweight optical cables, reducing the duct space required for new underground applications, reducing the splice box required for new structures, or storing more fiber in existing splice boxes.

[0024] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A 200-micron small-diameter optical fiber composite overhead ground wire, characterized by: The invention comprises a central aluminum-clad steel monofilament (1), an inner twisted wire layer (2) twisted outside the central aluminum-clad steel monofilament (1), and an outer twisted wire layer (3) twisted outside the inner twisted wire layer (2), wherein the inner twisted wire layer (2) is formed by twisting one or more optical units, and the optical unit comprises a loose tube (21) and a plurality of small-diameter optical fibers (22) arranged inside the loose tube (21); the diameter of the small-diameter optical fiber (22) is 200 microns, and the conductive unit of the outer twisted wire layer (3) is composed of the aluminum-clad steel monofilament.

2. The 200 μm small fiber diameter optical fiber composite overhead ground wire according to claim 1, characterized in that: The small-diameter optical fiber (22) comprises a core (221) located at the center of the optical fiber, a cladding (222) surrounding the core (221) and having a lower refractive index than the core, and a coating (223) surrounding the cladding (222).

3. The 200 μm small fiber diameter optical fiber composite overhead ground wire according to claim 1, characterized in that: The loose tube (21) has a diameter of 3.0 mm, and 36 small-diameter optical fibers (22) are arranged inside the loose tube (21).

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