Are optical fibers synthetic? What are the main components of optical fibers

First of all, optical fibers, while glass and plastic are all polymer compounds! It is a light conduction tool that uses the principle of total reflection of light in fibers made of glass or plastic. And glass and plastic are both polymer compounds!

The main varieties of synthetic fibers are as follows: (1) carbon chain synthetic fibers can be divided according to the main chain structure, such as polypropylene fiber (polypropylene), polyacrylonitrile fiber (acrylic), polyvinyl formaldehyde fiber (vinylon); Heterochain synthetic fibers, such as polyamide fibers (nylon), polyethylene terephthalate (polyester), etc. (2) According to the performance function, it can be divided into high-temperature resistant fibers, such as polybendazole fibers; high-temperature corrosion-resistant fibers, such as PTFE; high-strength fibers, such as polyterephthalyl p-phenylenediamine; radiation-resistant fibers, such as polyimide fibers; There are also flame retardant fibers, polymer optical fibers, etc.

There are three major processes in the production of synthetic fibers: preparation of synthetic polymers, spinning and molding, and post-processing.

So compare the two definitions! It's no problem that the book says that optical fibers are synthetic fibers!

Optical fibers are composite fibers made of two or more transparent materials with different refractive indices through special composite technology.

Its basic raw material is cheap quartz glass, which scientists draw into filaments with a diameter of only a few microns to tens of microns, and then wrap them with a layer of material with a refractive index smaller than it.

Yes. Natural ones can't conduct electricity and light.

The main component of optical fibers is high-purity silica celery.

1. The main component of optical fiber is high-purity silica, and its preparation needs to go through multiple processes, including preparation of rods, pre-stretching and stretch molding.

2. Optical fiber has the advantages of fast transmission speed, high communication quality, small signal loss, large data transmission capacity, small size, light weight, etc., and is widely used in communications, medical treatment, scientific research and other fields.

1. Definition and use of optical fibers.

Optical fibers, also known as optical fibers, are materials that transmit optical signals over long distances. It is a linear structure composed of the core in the center and the cladding layer of the surrounding core, which is widely used in communications, medical treatment, scientific research and other fields because of its small, lightweight and small signal loss.

Second, the main components of optical fibers.

1. The main component of optical fiber is high-purity silica, and its content can reach above. Silica is an inorganic compound, usually a white powder, with the formula SiO2, which is a very stable chemical compound with excellent resistance to heat, acids and bases.

2. In addition, there are a small amount of dopants, such as erbium, erbium, etc., through the selection of dopants and the adjustment of the doping amount, the optical properties of optical fibers can be changed to meet the needs of different fields.

3. Optical fiber manufacturing process.

1. Preparation of rods: First of all, it is necessary to mix high-purity silica powder and dopant evenly and prepare them into small rods.

2. Pre-stretching: Put the prepared small rod into a special sintering furnace for heating, and pre-stretch it into a rod with a smaller diameter.

3. Stretch molding: Then, the pre-stretched rod needs to be stretched continuously until its diameter is only a few microns to form a slender and soft optical fiber.

Fourth, the advantages and disadvantages of optical fibers.

1. Advantages: The advantages of optical fiber transmission speed, high communication quality, small signal loss, large data transmission capacity, small size, light weight, etc., are incomparable to traditional communication media such as traditional copper wire and coaxial cable.

2. Disadvantages: the manufacturing process of optical fiber is complex and the manufacturing cost is high; In addition, since it is a glass material, it is susceptible to damage due to physical impact or bending.

The main component of optical fibers is silicon dioxide.

Silica is an inorganic compound with the chemical formula SiO2, silicon atoms and oxygen atoms are arranged in a long-range order to form crystalline silica, and short-range ordered or long-range disordered arrangement to form amorphous silica.

In silica crystals, the silicon atom is located in the center of the tetrahedron, and the four oxygen atoms are located on the four apex angles of the tetrahedron.

The simplest form of silica is SiO2, but SiO2 does not represent a simple molecule (only the ratio of the number of atoms of silicon and oxygen in a silica crystal). Pure natural silica crystal, is a hard, brittle, insoluble, colorless and transparent solid, commonly used in the manufacture of optical instruments, etc.

Chemical properties

The chemical properties are relatively stable. Does not react with water. It has high fire resistance, high temperature resistance, low coefficient of thermal expansion, high insulation, corrosion resistance, piezoelectric effect limb size, resonance effect and its unique optical characteristics.

It is an acidic oxide and does not react with ordinary acids. Hydrofluoric acid reacts with silica to form gaseous silicon fluoride. Silicates and water are formed by reacting with a hot, concentrated alkali solution or molten alkali.

It reacts with a variety of metal oxides at high temperatures to form silicate. The nature of silica is not active, it does not interact with halogens other than fluorine and hydrogen fluoride, hydrogen halide, sulfuric acid, nitric acid, perchloric acid (except for hot concentrated phosphoric acid).

Problem 1: The main components of optical fibers are ( ) a silicon b glass c silicon dioxide l d sand a silicon element is a good semiconductor material, which can make silicon chips and silicon solar electric states, so a is wrong; b The main components of glass are sodium silicate, calcium silicate and silicon dioxide, so B is wrong; c The main component of optical fiber is silicon dioxide, which uses the principle of total reflection of light, so C is correct; d The main component of sand is silica, which also contains a lot of impurities, and the main component of optical fiber is not sand, so D is wrong; Therefore, C

Question 2: What is the main component of optical fiber It should be glass, but the question here is the composition, the component is a substance and not a mixture, and the main component of glass is SiO2

Question 3: The main component of the optical fiber is ( ) A pure silicon B glass C pure SiO2D sand The main component of the optical fiber is SiO2 A, because the composition of pure silicon is silicon, so A is wrong; B. Because the main components of glass are sodium silicate, calcium silicate, SiO2, B is wrong; c. Because the composition of the optical fiber is SiO2, C is correct; d. Because the main component of sand is SiO2, it is wrong to laugh at the sails; Therefore, C

1 Pinyin 2 Annotations.

guāng dǎo xiān wéi

From the melt of high-purity silica or quartz glass, a filament with a diameter of about 100 m is pulled, called quartz fiberglass. Glass can transmit light, but the light loss is very large in the transmission process, and the light loss with quartz glass fiber is greatly reduced, so this fiber is called optical fiber, which is one of the fine ceramics.

Optical fiber communication is possible using optical fibers. The laser has strong directionality and high frequency, making it an ideal light source for fiber optic communication. Compared with radio wave communication, optical fiber communication can provide more communication channels and meet the needs of large-capacity communication systems.

Optical fibers are generally composed of two layers, one of which is called the inner core, which is tens of microns in diameter but has a high refractive index; The outer layer is called the cladding and has a low refractive index. The light incident from one end of the optical fiber is repeatedly refracted by the inner core and transmitted to the end, and due to the difference in the refractive index of the two layers, the light entering the inner core is always transmitted in the inner core. The transmission distance of light is related to the optical loss of the optical fiber, the small optical loss, the long transmission distance, otherwise the repeater needs to be used to amplify the attenuated signal.

If the optical loss of the optical fiber is, the transmission distance can reach 500km; If it is reduced to 104 dB·km1, it can transmit 2500 km. Optical fibers made of the latest fluorine glass can transmit optical signals to the other side of the Pacific Ocean without the need for any relay stations.

In actual use, thousands of optical fibers are often combined together and strengthened to make optical cables like cables, which not only improves the strength of optical fibers, but also greatly increases the communication capacity.

Replacing communication cables with optical cables can save a lot of non-ferrous metals, and can save 2 3 tons of copper and lead per kilometer. Optical cable has the advantages of light weight, small size, compact structure, good insulation performance, long life, long transmission distance, good confidentiality and low cost. Optical fiber communication is combined with digital technology and computers, which can be used to transmit **, images, data, control electronic equipment and intelligent terminals, etc., and play a role in partially replacing communication satellites as a companion.

The optical fibers with large light loss can be used at short distances, and are especially suitable for making various human endoscopes, such as gastroscopes, cystoscopes, direct sales colonoscopies, hysteroscopies, etc., which are extremely beneficial to the diagnosis and treatment of various diseases.