A multimode fiber b single mode fiber
In the sixth part.
Question 2: Common models and specifications of optical cables: GYTA single-mode optical cables.
The structure of GYTA optical cable is that 250μm optical fiber is sheathed in a loose tube made of high modulus material, and the loose tube is filled with waterproof compound. The center of the cable core is a metal reinforced core. For some multi-core optical cables, it is necessary to extrude a layer of polyethylene (PE) outside the metal reinforced core. Loose tubes (and filling ropes) are wound around the central reinforcing core to form a compact and round cable core, and the gaps in the cable core are filled with water-blocking fillers. Plastic aluminum-clad tape (APL) is longitudinally wound and then extruded into polyethylene sheath to form cable.
8. 12 stands for 8 cores, and 12 cores.
B 1 stands for class G.652, which is a conventional single-mode fiber.
Communication optical fiber is divided into six categories and several subclasses: G.65 1, G.652, G.653, G.654, G.655 and g.656.
(1) G.65 1 is a multimode fiber. IEC and GB/T are further divided into A 1a, A 1b, A 1c and A/kloc-0 according to its core diameter, cladding diameter and numerical aperture.
(2)G.652 is a conventional single-mode fiber, which is currently divided into four subclasses: G.652A, G.652B, G.652C and G.652D. IEC and GB/T named G.652C as B 1.3, and others as B1.652d.
(3)G.653 fiber is dispersion-shifted single-mode fiber. IEC and GB/T classify G.653 fiber as B2 fiber.
(4)G.654 fiber is a kind of single-mode fiber with cut-off wavelength drift, which is also called 1550nm fiber with the best performance. IEC and GB/T classify G.654 fiber as B 1.2 fiber.
(5)G.655 fiber is a non-zero dispersion single-mode fiber, which is currently divided into three subclasses: G.655A, G.655B and G.655c. IEC and GB/T classify G.655 fiber as B4 fiber.
Question 3: What is the difference between single-mode optical cable and multimode optical cable? The main physical difference between single-mode optical cable and multimode optical cable is the size of cable core. There are two cable core sizes (50.0μm and 62.5μm). The rated size of single-mode optical cable is 9.0μm m. Multimode optical cable can transmit optical signals in multiple channels (or multiple modes), while single-mode optical cable, as its name implies, only allows light to transmit high-order modes and low-order modes in one channel.
Question 4: Is there any difference in appearance between single-mode fiber and multimode fiber? Yes
Outdoor optical cables can be distinguished by the following signs:
GYXTW-4B 1
GYXTW is the type of optical cable, which stands for standard central bundle optical cable.
4 indicates that this cable is 4 cores.
B 1 indicates that the optical cable adopts single-mode G.652B optical fiber.
GYTS-8B4
GYTS is the type of optical cable, which stands for standard loose tube stranded optical cable.
8 indicates that this cable is 8 cores.
B4 stands for single-mode G.655 optical fiber used in this cable.
GYFTY- 16A 1b
GYFTY is the type of optical cable, which stands for standard nonmetallic loose tube stranded optical cable.
16 indicates that the cable has 16 cores.
A 1b indicates that the optical cable adopts multimode 62.5/ 125 optical fiber.
GYFTZY-24A 1a
GYFTZY is a type of optical cable, that is, a standard nonmetallic loose tube stranded flame retardant optical cable.
24 indicates that the optical cable has 24 cores.
A 1a means that this optical cable uses multimode 50/ 125 optical fiber.
In addition to the above methods, indoor optical cables can also be distinguished according to color.
Indoor single-mode optical cable is yellow.
Indoor multimode cable is orange.
Attachment: The picture shows the indoor multimode four-core branch cable.
Is this ok?
Question 5: Is this cable single-mode or multimode? It's urgent Outdoor optical cables can be distinguished by the following signs:
GYXTW-4B 1
GYXTW is the type of optical cable, which stands for standard central bundle optical cable.
4 indicates that this cable is 4 cores.
B 1 indicates that the optical cable adopts single-mode G.652B optical fiber.
GYTS-8B4
GYTS is the type of optical cable, which stands for standard loose tube stranded optical cable.
8 indicates that this cable is 8 cores.
B4 stands for single-mode G.655 optical fiber used in this cable.
GYFTY- 16A 1b
GYFTY is the type of optical cable, which stands for standard nonmetallic loose tube stranded optical cable.
16 indicates that the cable has 16 cores.
A 1b indicates that the optical cable adopts multimode 62.5/ 125 optical fiber.
GYFTZY-24A 1a
GYFTZY is a type of optical cable, that is, a standard nonmetallic loose tube stranded flame retardant optical cable.
24 indicates that the optical cable has 24 cores.
A 1a means that this optical cable uses multimode 50/ 125 optical fiber.
In addition to the above methods, indoor optical cables can also be distinguished according to color.
Indoor single-mode optical cable is yellow.
Indoor multimode cable is orange.
Optical cable, MPO, optical fiber jumper, fiber optic adapter, optical fiber junction box and other related products should be of high quality, so as to ensure our network transmission. We use finit in the project.
Question: What's the difference between GYTS cable and GYTA cable? GYTS optical cable is overhead or directly buried optical cable, and GYTA optical cable is overhead or pipeline-crossing optical cable. One can be buried directly in the ground, and the other is through pipelines, which is theoretically impossible. This is the difference.
Question 7: Model of optical cable. Who knows what the optical cable GYTA 4A 1B 62.5/ 125 means? Although answering this question may not be adopted, I still can't help it! ! !
GY stands for outdoor, T stands for ointment filling, A stands for aluminum-polyethylene bonded sheath, 4 stands for four optical fibers, A 1B stands for multimode A 1B optical fiber, 62.5 stands for core diameter, and 125 stands for clad fiber diameter.
There are mainly A 1a and A 1b multimode optical fibers, in which the core diameter of A 1a is 50um and that of A 1b is 62.5um, so don't mix them!
The full name of this model is a metal reinforcing member, which is filled with loose ground paste, aluminum-polyethylene adhesive sheath (aluminum tape is wrapped with polyethylene sheath after flat winding), and an outdoor optical cable for communication with four A 1a multimode optical fibers.
Question 8: I only know that there are two types of optical fiber: single mode and multimode. Single mode refers to the wavelength at 13 10NM, and multimode refers to 850NM. There are also different interfaces, including LC, SC and FC. Due to limited professional knowledge, others are found online! Please refer to! A, the classification of optical fiber is the abbreviation of optical fiber. However, optical fiber is often simplified as optical fiber in optical communication system, such as optical fiber amplifier or optical fiber backbone. Some people ignore that although optical fiber means fiber, it refers to optical fiber in optical system. Therefore, in the description of some optical products, it is obviously not advisable to translate fiber into "optical fiber". Optical fiber actually refers to a medium in which a core made of transparent material and a cladding made of a material with a slightly lower refractive index are wrapped around it, and the optical signal injected into the core is reflected by the cladding interface, so that the optical signal propagates in the core. There are many kinds of optical fibers, and the required functions and performances are different according to different uses. However, the design and manufacturing principles of cable TV and communication optical fiber are basically the same, such as: ① low loss; ② It has a certain bandwidth and small dispersion; ③ Easy wiring; (4) easy to unify; ⑤ High reliability; ⑥ The manufacturing is relatively simple; ⑦ Low price, etc. The classification of optical fibers is mainly summarized from working wavelength, refractive index distribution, transmission mode, raw materials and manufacturing methods. The following are some examples of various classifications. (1) Working wavelength: ultraviolet fiber, visible fiber, near-infrared fiber and infrared fiber (0.85pm, 1.3pm, 1.55pm). (2) Refractive index distribution: stepped (SI) type, nearly stepped type, graded (GI) type, others (such as triangle, W type, concave type, etc. (3) Transmission modes: single-mode fiber (including polarization-maintaining fiber and non-polarization-maintaining fiber) and multimode fiber. (4) Raw materials: timely glass, multielement glass, plastic and composite materials (such as plastic cladding, liquid fiber core, etc.). ), infrared materials, etc. According to the coating material, it can also be divided into inorganic materials (carbon, etc. ), metal materials (copper, nickel, etc. ) and plastic. (5) Manufacturing method: Preforming includes vapor axial deposition (VAD), chemical vapor deposition (CVD), etc. Drawing methods include rod cannula method and double crucible method. Secondly, the timely optical fiber is an optical fiber with silicon dioxide (SiO2) as the main raw material, and the refractive index distribution of the core and cladding is controlled according to different doping amounts. Timing (glass) series optical fibers have the characteristics of low loss and broadband, and have been widely used in cable TV and communication systems. Fluorine-doped optical fiber is one of the typical products of timely optical fiber. Generally, in the optical fiber for communication in 1.3 μm wave domain, the dopant of the control core is GeO2, and the cladding is made of SiO. However, silica is mostly used in the core of fluorine-doped optical fiber, while fluorine is doped in the cladding. Rayleigh scattering loss is a light scattering phenomenon caused by the change of refractive index. Therefore, it is desirable to form less dopants with refractive index change factors. The main function of fluorine is to reduce the refractive index of silicon dioxide. So it is often used for cladding doping. Because the core of fluorine-doped fiber does not contain fluorine dopant which affects the refractive index. Because its Rayleigh scattering is very small, the loss is close to the theoretical minimum. So it is mostly used for long-distance optical signal transmission. Compared with other optical fibers, the timely optical fiber has a wider optical transmission spectrum from ultraviolet light to near infrared light, which can be used in the fields of light guide and image transmission besides communication. Thirdly, infrared fiber, as the working wavelength of the timely series optical fiber developed in the field of optical communication, can only be used for 2pm even if it is used for short transmission distance. Therefore, it can work in the field of longer infrared wavelength, and the developed optical fiber is called infrared fiber. Infrared optical fiber is mainly used for light energy transmission. For example: temperature measurement, thermal image transmission, laser scalpel medical treatment, thermal energy treatment, etc. , the penetration rate is still low. Fourth, heavy Taiwan is light >>
Question 9: How many types of optical cables are there? The products of eight optical cable enterprises have won "China Famous Brand", namely Chang Fei Optical Fiber and Cable Co., Ltd., Hengtong Group Co., Ltd., Tongguang Group Co., Ltd., Fiberhome Communication Technology Co., Ltd., Zhongtian Technology Group Co., Ltd., Yongding Group Co., Ltd., Futong Group Co., Ltd. and Ding Tong Group Co., Ltd. ..
The types of optical cables commonly used in network engineering and monitoring engineering are: GYXTW central bundle tube (2- 12 core), GYSTS and GYSTS stranded optical cables (2- 144 core), GYTY53 twisted optical cable, GYFTY nonmetallic optical cable, GJFJV indoor optical cable, GYXTZW and GYSTZS flame-retardant optical cable; Accessories include: optical fiber jumpers, pigtails (FC, SC, ST, LC, MTRJ), couplers, junction boxes, and optical fiber transceivers (10/100/1000m adaptive, pure Gigabit).
Compilation method of optical cable model
type
This pattern consists of five parts, each part is represented by a code name, as shown in the figure below. Among them, structural features refer to the structural features derived from cable core structure and optical cable.
Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ
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First, the classification code
Gy- communication outdoor optical cable (field)
Second, strengthen the component code
Reinforcing member refers to the member that enlarges or embeds the sheath inside to enhance the tensile strength of optical cable. If there are both metal and nonmetal reinforcing members, they are only expressed as structural features of metal members.
(Unsigned)-Metal reinforcing member
F- nonmetallic reinforcing member
Three, cable core and cable derivative structure characteristic code.
The structural characteristics of optical cable should indicate the main types of cable core and the derivative structure of optical cable. When it is necessary to pay attention to several structural features of optical cable types, it can be expressed by combination codes, which are arranged in the following order from top to bottom.
D- fiber ribbon structure
S-Loosening structure of optical fiber
J-type optical fiber tight sleeve coating structure
(Unsigned)-Layer Stranded Structure
X cable center tube (covering) structure
T-shaped filling structure
C- self-supporting structure
Electron elliptical shape
Z- flame retardant structure
Fourth, the code of the sheath
Y- polyethylene sheath
V-PVC sheath
Aluminum-polyethylene bonded sheath (sheath for short)
Stainless steel-polyethylene bonded sheath (S sheath for short)
Steel wire W- steel-polyethylene bonded sheath (W sheath for short)
Five, the outer sheath code
When there is an outer protective layer, it can include part or all of the cushion layer, armor layer and outer covering layer, and its code name is represented by two groups of numbers (the cushion layer need not be represented). The first group represents the armor layer, which can be one or two digits, such as table1; The second group represents the outer cover or coat, which should be numbers.
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Composition of optical fiber specifications
Optical fiber specifications consist of optical fiber number and optical fiber category.
Optical fiber numbering code
It is expressed by the actual effective number of similar optical fibers in the optical cable.
Optical fiber category code
The category of optical fiber should be indicated by the classification code of optical fiber products, that is, capital A indicates multimode fiber, capital B indicates single-mode fiber, and then numbers and lowercase letters indicate different types of optical fiber. A jujube multimode fiber, see table 3.
Table 1 armor layer
code name
Armor layer
Unarmored layer
2
Winding double-layer steel strip
three
Single thin round steel wire
33
Double thin round steel wire
four
Single thick round steel wire
Forty-four
Double thick round steel wire
five
Corrugated steel strip
Table 2 Outer cover or coat
code name
An outer covering or coat.
1
Fiber cover
2
Pvc bushing
three
Polyethylene casing
four
Polyethylene sleeve covered with nylon sleeve
five
Polyethylene protective sleeve
Table 3 Multimode Optical Fiber
classification designation
characteristic
Core diameter (micron)
Cladding diameter (micron)
material
wing
Graded refractive index
50
125
silicon dioxide
White linen vestment
Graded refractive index
62.5
125
silicon dioxide
Alc
Graded refractive index
Eighty-five
125
silicon dioxide
......& gt& gt
Question 10:50/ 125 multimode cable is a 10 gigabit cable? What is OM3? Is there a million megabits of single mode? If yes, what's the number? 50/ 125 refers to the core diameter/cladding diameter. IEC named it A 1a, which belongs to multimode category. OM3 refers to the product of A 1a optical fiber, which is optimized for the wavelength of 850nm and improves the bandwidth. It is a subclass of A 1a, named A 1a.2 by IEC. If the fully injected bandwidth is greater than 1500MHz*km and the effective mode bandwidth is greater than 2000MHz*km, it can be called OM3 fiber. OM3 optical fiber is called OM3-300 when the link length can reach 300m in 10Gb/s Ethernet (that is, 10Gb). There is also OM3- 150 commonly known in the industry. Strictly speaking, this does not meet the requirements of OM3, and it can only be called OM2+. Therefore, whether 50/ 125 optical fiber can be called 10 Gigabit depends on bandwidth data, and only those that meet OM3 requirements are called 10 Gigabit.
The bandwidth of single-mode fiber can basically be considered as infinite, and there is no difference of ten thousand megabytes.