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Plastic optical fibers, plastic optical fiber cables, optical fiber cables with plugs

A technology of optical fiber and optical fiber, which is applied in the coupling of optical waveguide, optical guide, optics, etc., can solve the problems that the strength of the sheath material cannot be fully improved, the numerical aperture of the optical fiber becomes larger, and the transmission loss of the optical fiber increases. Excellent strength, low bending loss, and low transmission loss

Inactive Publication Date: 2006-04-12
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the 17FM unit reduces the refractive index of the copolymer, in order to increase the strength of the sheath material, if a large amount of 17FM unit is contained in the copolymer, the refractive index of the copolymer will be lowered, and the numerical aperture of the optical fiber using the copolymer as a sheath material is get bigger
[0007] In this way, in optical fibers with low transmission loss and low numerical aperture, the strength of the sheath material has not been sufficiently improved until now.
Therefore, when such an optical fiber is stored in the form of a reel generally used for storage or distribution, there is a problem that the transmission loss of the optical fiber increases.

Method used

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  • Plastic optical fibers, plastic optical fiber cables, optical fiber cables with plugs
  • Plastic optical fibers, plastic optical fiber cables, optical fiber cables with plugs
  • Plastic optical fibers, plastic optical fiber cables, optical fiber cables with plugs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] The present invention will be described more specifically by way of examples below. In addition, the evaluation and measurement in an Example were performed by the following method.

[0061] (melt index (MI))

[0062] At 230°C, with a load of 5 kg, the amount of polymer in grams discharged from a die nozzle with a diameter of 2 mm and a length of 8 mm was measured for 10 minutes.

[0063] (refractive index)

[0064] A film-shaped test piece having a thickness of 200 μm was produced by melt extrusion, and the refractive index of the sodium D line was measured at room temperature 25° C. using an Abbe refractometer.

[0065] (Bending test)

[0066] The bending test was carried out according to ASTM D790. A test piece having a length of 5 inches (12.7 cm), a width of 0.5 inches (1.27 cm), and a thickness of 0.25 inches (0.635 cm) was formed using an injection molding machine 75MS manufactured by Mitsubishi Heavy Industries, Ltd. (0.635 cm). Then, using TENSILON / UTM 125...

Embodiment 1

[0084] The composition of the copolymer except for the sheath material is 33% by weight of 2-(perfluorooctyl)ethyl methacrylate, 12% by weight of benzyl methacrylate, 54% by weight of methyl methacrylate, and 1% by weight of methacrylic acid. %, the addition of n-octyl mercaptan is 0.15% by weight, and in the same manner as in Comparative Example 1, a sheath material, an optical fiber, and an optical fiber cable are manufactured, and they are wound on a shaft in the same manner as in Comparative Example 1.

[0085] The melting index of the copolymer for the sheath material is 23 g / 10 minutes, the refractive index is 1.465, and the fracture deflection measured by the bending test is 8.2 mm.

[0086] The transmission loss of this optical fiber is 132dB / km. When this optical fiber was wound on a shaft and heat-treated as in Comparative Example 1, the transmission loss of the heat-treated optical fiber was 195 dB / km, and the increase in transmission loss before and after the heat ...

Embodiment 2～9、 comparative example 2～5

[0088] Except that the copolymer composition of the sheath material was changed as shown in Table 1, the same operation was performed as in Example 1 to manufacture the sheath material, optical fiber, and optical fiber cable. The evaluation results are shown in Table 1.

[0089]

composition

M1

to refract

Rate

deflection at break

Amount (mm)

optical fiber

NA

fiber optic transmission

Loss(dB / km)

fiber optic reel

Transmission loss(dB / km)

fiber optic reel

Loss increase (dB / km)

Teleport when fiber optic cable is reeled

Loss increase (dB / km)

Optical cable transmission frequency

Band (MHz)

Optical cable is bent and broken

Number of cracks

Optical cable bending loss

loss (dB / km)

Example 1

17FM / BzMA / MMA / MAA

33 / 12 / 54 / 1wt%

23

1.465

8.2

0.28

132

195

...

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Abstract

A copolymer produced by copolymerizing a vinyl compound (A) capable of giving a homopolymer having a refractive index of 1.50 or above with at least a fluoroalkyl (meth)acrylate (B) of the general formula (1) and methyl methacrylate (C) and characterized in that the (A) / (B) mass ratio of the copolymer lies in the range of 0.2 to 1; and plastic optical fibers and plastic optical fiber cables, made by using this copolymer as the cladding material. These plastic optical fibers and plastic optical fiber cables exhibit low transmission loss, which little increases even when they are held in a state winded on a bobbin, and small bending loss, and permit wide-band information transmission. In formula (1) X is H or CH3; and Rf is fluoroalkyl having 7 to 14 carbon atoms and 13 to 25 fluorine atoms.

Description

technical field [0001] The present invention relates to low numerical aperture plastic optical fibers suitable for high-speed communication applications, copolymers suitable for use as such optical fiber sheath materials, and plastic optical fiber cables and plastic optical fiber cables with plugs. Background technique [0002] Plastic optical fiber (hereinafter appropriately referred to as "optical fiber") is a product with a shorter transmission distance than quartz-based optical fibers. It is inexpensive, light in weight, flexible, and large in diameter. ), OA (Office Automation, office automation), LAN (Local Area Network, local area network) and other short-distance communication applications are being practically used. Most of the currently used plastic optical fibers are products with a core-sheath (core-cladding) structure with polymethyl methacrylate (PMMA) as the core material. The combination of light sources is expected to be used as a high-speed information com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00C08F220/24C08F220/22G02B1/04G02B6/38
CPCG02B1/048G02B6/02033G02B6/3807C08F220/22C08F220/24C08L33/16C08F220/1807C08F220/14C08F220/06
Inventor 塚本好宏川原田泰入江菊枝地纸哲哉奥村淳鱼津吉弘
Owner MITSUBISHI RAYON CO LTD
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