Tag Archives: Single Mode Fiber Cable

Three Common Types Of Fiber Optic Cables


There are, three common types of fiber optic cables, as listed below. The suitability of each type for a particular application depends on the fiber optic cable’s characteristics.

The single-mode step-index fiber cable, sometimes called a single-mode fiber cable, is shown in Figure 1.5(a). The single and multimode step-index fiber cables are the simpplest types. Single-mode fiber cables have extremely small core diameters, ranging from 5 to 9.5 um. The core is surrounded by a standard cladding diameter of 125 um. The jacket is applied on the cladding to provide mechanical protection, as shown in Figure 1.3. Jackets are made of one type of polymer in different colours for colour-coding purposes. Single-mode fibers have the potential to carry signals for long distances with low loss, and are mainly used in communication systems. The number of modes that propagate in a single-mode fiber depends on the wavelength of light carried. The number of modes will be given in Equation (1.9). A wavelength of 980nm results in multimode operation. As the wavelength is increased, the fiber carries fewer and fewer modes until only one mode remains. Single-mode operation begins when the wavelength approaches the core diameter. At 1310 nm, for example, the fiber cable permits only one mode. It then operates as a single-mode fiber cable.

singlemode fiber

The multimode step-index fiber cable, sometimes called a multimode fiber cable. Multimode fiber cables have bigger diameters that their single-mode counerparts, with core diameters ranging from 100 to 970 um. They are available as glass fibers (a glass core and glass cladding), plastic-clas silica (a glass core and plastic cladding), and plastic fibers (a plastic core and cladding). They are also the widest ranging, although not the most efficient in long distances, and they experience higher losses than the single-mode fiber cables. Multimode fiber cables have the potential to carry signals for moderate and long distance with low loss (when optical amplifiers are used to boost the signals to the required power). Plastic fiber optic cable is available in Fiberstore,  it is an optical fiber made out of plastic rather than traditional glass. It offers additional durability for uses in data communications, as well as decoration, illumination and industrial application. FiberStore provides both simplex and duplex plastic optical fibers.

Since light rays bounded through a fiber cable reflect at different angles for different ray pathc, the path lengths of different modes will aslo be different. Thus, different rays take a shorter or longer time to travel the lenth of the fiber cable. The ray that goes straight down the centre of the core without reflecting arrives at the other end faster. Other rays take slightly longer and thus arrive later. Accoringly, light rays entering a fiber at the same time will exit at the other end at different times. In time, the light will spread out because of the different modes. This is called modal dispersion. Dispersion describes the spreading of light rays by various mechanisms. Modal dispersion is that type of dispersion that results from the varying modal patch lengths in the fiber cable.

Multimode graded-index fiber are sometimes called graded-index fiber cables (GRIN). Graded-index and multimode fiber cables have similar diameters. Common graded-index fibers have core diameters of 50,62.5, or 85 um, with a cladding diameter of 125 um. The core consist of numerous concentric layers of glass, somewhat like the annular rings of a tree or a piece of onion. Each successive layer expanding outward from the central axis of the core until the inner diameter of the cladding has a lower index of refrection. Light travels faster in an optical material that has a lower index of refraction. Thus, the further the light is from the centre axis, the greater its speed. This type of fiber optic cable is popular in applications that require a wide range of wavelenths, in particular telecommunication, scanning, imaging, and data processing stystems. In particular telecommunication,  Multimode OM4 fiber optic cable is used in any data center looking for high speeds of 10G or even 40G or 100G. OM4 multimode fiber are ideal for using in many applications such as Local Area Networks (LAN) backbones, Storage Area Networks (SAN), Data Centers and Central Offices.

multimode fiber

Fiberstore provides a wide range of bulk fiber optic cable with detailed specifications displayed for your convenient selecting. Per foot price of each fiber cable is flexible depending on the quantities of your order, making your cost of large order unexpected lower. Customers can also have the flexibility to custom the cable plant to best fit their needs.

Related Article: The Advantages and Disadvantages of Optical Fiber

The Characteristics Of Singlemode and Multimode Fiber

Fiber is short for optical fiber, it is a new kind of optical waveguides, it is optical communication system that most common and most important transmission medium.

It consists of a single glass core, the cladding layer close to the core, a primary coating layer and a protective layer composed of plastic cap.(Cylindrical fiber, the core, cladding and coating layers composed of three parts.) Core and the cladding layer consists of two different optical properties of the medium constituting the medium refractive index of light than the interior of a surrounding medium high refractive index. In the periphery of the package as the cover layer of opaque material, as the light is prevented from escaping from the surface during interspersed.

Multimode Optical Fiber

When the geometry of the fiber is much larger than the wavelength of light (about lμm), optical transmission process will be a significant presence of dozens or even hundreds of transport modes, such as the fiber is called multimode Fiber Optic Patch Cables.

Due to different propagation modes having different phase propagation velocity, thus, long-distance transmission is generated through mode dispersion (after long-distance transmission delay difference is generated, resulting in the optical pulse broadening). Side mode dispersion will narrow the bandwidth of multimode fiber, the transmission capacity is reduced, and therefore, multi-mode fiber is only suitable for low speed, short-distance optical fiber communication, data communication is currently a large number of multi-mode optical fiber local area network.

Main products and application performance of multimode fiber in the following table:

Multimode Fiber
The related products about 62.5/125mm Multimode Fiber from fs.com, it is below:

Duplex OM1 62.5 125 Fiber Patch Cable

The product about  50/125mm OM2 Multimode Fiber

Duplex OM2 50 125 Fiber Patch Cable

Single Mode Fiber Cable

When the geometry of the fiber is small, and the wavelength of the same order as the core diameter in the range of 4-10μm, the optical fiber allows only one mode (basic mode) in which the transmission, the remaining high-order mode are all turned off, so that said Single Mode Fiber. Avoid the mode dispersion single mode fiber, suitable for large-capacity long-distance transmission.

IEC 60793-2 and IEC 60793-2-50 singlemode fiber will be divided into B1.1, B1.2, B1.3, B2, B4, B5, B6 and other categories, ITU-T also G.652, G .653, G.654, G.655, G.656, G.657 and other recommendations were standardized definition and characteristics of various single-mode fiber, and each part of the GB / T 9771 with reference to IEC 60793-2-50 ITU-T G.65x series formulation.

A given type of single mode fiber, the mode field diameter by (also called effective area), the dispersion coefficient, dispersion slope, wavelength cutoff adapted to optimize the parameters, and access ways for different applications.

Fiber Optic Cabling Solutions

Fiberstore’s cabling solutions are from copper medium, fiber, with its unique plastic Fiber Optic Patch Cables (POF) solutions, and has strong reliability and ese of use, and it has the following characteristics.

Firstly, from the appearance, Fiberstore cabling products is better than other similar products. Whether modular information outlet, modular information outlet or patch panel and a large number of terminals on the board, to the user’s first impression is compact and lightweight structure, moderate size (small footprint), assembly process concise and detailed, non-professional staff can easily operate.

Secondly, Fiberstore cabling products are suitable for small and medium sized cabling system planning and installation, flexible and elastic. Currently on the market for the three kinds of mainstream MDF Specification: 100 pairs, 300 pairs and 900 pairs, for some small and medium systems (especially 50 or 150 information points system) planning. It cause that the overall layout is unreasonable, wasted building space. And just to make up for this deficiency, GCI launched the 50 pairs, 200 pairs and 400 in the series patch panels, planning to meet the needs of different systems, and make more rational design, optimization, while users can also facilitate future maintenance management.

Thirdly, the most important point one, Fiberstore cabling products are more vitality. This is mainly because GCI connection terminal board perfectly match with its corresponding patch. The reasonableness of its unique design allows users to easily achieve upgrades and changes the entire wiring system rack, network connectivity changes for a variety of system applications, and heterogeneous machines, can easily be completed by way of a flexible jumpers in an instant.

And then, Fiberstore provides fiber optic products, including Single Mode Fiber Cable, multimode fiber optic cable, fiber optic connecting devices such as a full range of products, and to design a flexible solution that is more close to the people which the local user needs. With deep technical reserves, Fiberstore is being updated constantly develop all-optical solutions, cutting-edge technology to lead the world trend.Fiberstore Complete product range and reliable performance has been a model for the industry, has been widely used for a variety of communication channels designed cabling system. In particular, the epoch-making in the field of fiber optic products─plastic optical fiber, without professional training to operate, can be easy to achieve high-speed transfer rate, high bandwidth.

Information transfer rate up new plastic optical fiber per 10Gbps, is 10 times the existing glass fiber. The advent of new high-speed plastic optical fiber, will not only basic trunk network, but will also have the office, home computers, fiber optic terminal of an enormous boost. Plastic optical fiber diameter ratio of 30 times coarse glass fiber, flexible, and easier to connect.

The information transfer of new plastic optical fiber rate up per 10Gbps, it is 10 times the existing glass fiber. The advent of new high-speed plastic optical fiber, not only basic fiber trunk cable network, but also have an enormous boost to the office, home computers, pre terminated fiber. Plastic optical fiber diameter ratio of 30 times coarse glass fiber, flexible, and easier to connect.

Fiberstore plastic optical fiber solutions is made up of a fiber-rich plastic optical product, including indoor dual core plastic optical fiber, plastic fiber optic connectors, dual-core plastic optical fiber jumper, plastic optical fiber jumper logo, plastic fiber optic coupler, fiber optic patch panels, 8-port plastic optical fiber switches, network cards and POF-RJ45 port fiber optic transceivers composition.

Fiberstore fiber cords have multimode and singlemode, they meet ANSI/TIA/EIA568A standards, passed the UL certification for fiber to the desktop, connected to the transmission equipment and the production of fiber optic jumpers. They can be applied to management, equipment room and work area.

In summary, Fiberstore Fiber optic cabling system with its unique open design rationalization plan, as well as comprehensive product application technology simple connection combination, not only for users with high-quality transmission performance and comprehensive service support, giving users more high efficiency, high mobility system maintenance operability. Fiber optic cabling solutions with seamless integration of active networking products, so Fiberstore fiber optic cabling solutions are with a stronger overall performance.

FAQ In Fiber Optic Cabling

Firstly, do choose multimode or single mode fiber? What is the difference between them?

In general, the user requests the fiber transmission distance is relatively short, such as a few hundred meters, can be Multimode Fiber Optic Cable. However, if the transmission distance has several kilometers, even further, without the use of signal repeaters must be single-mode fiber.

Secondly,  Do choose 4 core, 6 core, 8 core or more core Fiber Optic Patch Cables?

Fiber complete the transfer task, it must receive at least one first serve two core. In fact, there are 4,6,8 or more optical fiber core, the core can be used as extra backup, you can do more transmission channels.

Thirdly,  Does use wall or rack-mounted fiber optic patch panel cable box?

Wall fiber boxes are generally used in small fiber-optic network, for example, a 4-core optical fiber, but if there is more number of fiber optic, it shows the advantages of rack patch panel. It can be placed inside the routers and switches with a cabinet for easy centralized management and more secure.

And then, What is the connector type of FC,SC,ST,LC,MTRJ, and Which one can be choose?

These different interfaces have used in different environments, they differ mainly in the method and shape connection, is it the same as the screws tighten or direct card? Is square or round? Large or small mouth opening (mouth relatively large place occupied by a small mouth can have greater port density)? Two heads separately or synthetic one? Users need not be too concerned about the specific interface, to note that if the extension already exists in the case of older fiber optic systems, you have to match each job.

Finally, Is the choice of the center beam tube or Stranded cable?

Central tube Fiber Optic Cable placed in the center portion of the cable core, many of the core tube synthesis bunch shape, and the outer cable surrounding two wires placed in parallel to ensure tensile strength.

The central part of Stranded cable strengthen stereotypes core fiber. Fiber core surrounded by a peripheral that strengthen the core, many cores together to form the shape layer by layer.

How to identify fiber optic, is single mode or multimode fiber?

The first is a relatively simple method for indoor fiber, it can be identified by single-mode fiber and multimode fiber external color, Single Mode Fiber Cable is yellow, Multimode Fiber Optic Cable is red. Including Fiber optic patch cords and Fiber pigtails are the same recognition.

For MPO Fiber, generally can be identified by model code, there are a bunch of characters on the cable sheath, such GYXTW-4-A1a, the last paragraph begins with A on behalf of the multi-mode fiber, beginning with B represents a multi-mode fiber, a little more detail, A1a representing 50/125 multimode fiber specifications, A1b representatives 62.5/125 multimode fiber specifications, B1.1 representatives of non-dispersion shifted single-mode fiber and so on.

If this way can not be identified single mode fiber or multimode fiber, it is only through a special device to identify, as fiber splicing machine, it will automatically recognize the single mode or multimode fiber, single mode will show SM, multi-mode will show MM.

The Basic Knowledge of Optical Fiber and Pigtail

How do fiber optic work?

Optical fiber communications composed of thin glass by the plastic protective overcoat layer. Glass essentially consists of two parts: the core diameter of 9 to 62.5μm, a low refractive index outer cladding diameter of 125μm glass material. Although according to the different materials
used, there are some other types of fiber, but is mentioned here that the most common types. Light in the core portion of the fiber to the “total internal reflection” mode transmission, but also refers to the light entering end of the fiber, the interface between the core and the cladding reflected back and forth, and then transmitted to the other end of the fiber. Core diameter of 62.5μm, outer cladding diameter of 125μm fiber called 62.5/125μm fiber.

What is the difference between multimode and single-mode fiber?

Multimode Fiber Optic Patch Cables

Almost all of the Multimode Fiber Optic Patch Cables dimensions are 50/125μm or 62.5/125μm, and the bandwidth (the amount of information transmission fiber) is usually 200MHz to 2GHz. Multimode optical transceiver via multimode fiber can be up to 5 km of transmission. In the light emitting diode or a laser light source.

Single Mode Fiber Cable

The size of Single Mode Fiber Cable 9-10/125μm, and compared with a multimode optical fiber, it has unlimited bandwidth and low loss characteristics. The single mode optical transceiver used for long-distance transmission, and sometimes up to 150-200 km. Using a narrow spectral line LD or LED as a light source.

Single mode fiber is cheap, but compared to multi mode fiber device, it is more expensive. Single-mode devices typically can run on single mode fiber, but also be run on a multi mode fiber, and multimode device only runs on multimode fiber.

How is the loss with using of the Fiber Optic Patch Cables?

It depends on the the wavelength of the transmitted light and the kind of optical fiber

When 850nm wavelengths for multimode fiber: 3.0 dB / km
When 1310nm wavelength for multimode fiber: 1.0 dB / km
When 1310nm wavelength for single mode fiber: 0.4 dB / km
When 1550nm wavelength for single mode fiber: 0.1 dB / km

Fiber Optic Pigtails

Fiber Optic Pigtails ony has one end connector, and the other end is an optical fiber core breakage, by fusion connected with other core cable, often appear in the fiber optic terminal box for connecting cable and fiber optic transceivers.

Fiber optic pigtails devide into multimode and singlemode fiber pigtails. Multimode fiber pigtail is orange and wavelength of 850nm, the transmission distance of 500m, for short-range connectivity. Single mode fiber pigtail is yellow, there are two wavelengths, 1310nm and 1550nm, transmission distance of 10km and 40km.

Fiber optic pigtail connector was devided into single mode and multimode by the mode of fiber optic cable; By overall structure can be divided into FC, SC, ST, MU, LC, F25, etc. By the end structures can be devided into PC、UPC、APC.

Here are some fiber optic pigtails products in fs.com, as shown in figure:

Multimode LC/SC/ST/FC Pigtail

Multimode LC/SC/ST/FC Pigtail

ingle-mode LC/SC/ST/FC Bunch Pigtail

Our fs.com provide wide degree flexibility on fiber pigtails, including 9/125 single-mode, 62.5/125 multimode 50/125 multimode and 10G 50/125um OM3 types, simplex fiber, 4 fibers, 6 fibers, 8 fibers, 12 fibers, 24 fibers, 48 fibers and so on.These fiber pigtails can be with fan-out kits and full compliant to Telcordia, EIA/TIA and IEC standards. Welcome to our store to know more information.

The Development and Benefits of Multi core Singlemode Fiber

1. The development of multi core single mode fiber

A typical optical fiber is single mode fiber structure, the outer cladding / inner cladding surrounding the core constitutes a waveguide. A common multi-core optical fiber includes a number of cores ,and each core have their own single-mode optical fiber inner cladding .Thus, each core is an fiber optic of the waveguide , i.e.,one singlemode fiber optic cable’s function is be equal to a plurality of single core fiber . The obvious advantage of this fiber is low cost, low production costs of about 50% compared with ordinary fiber. In addition, Fiber optic cables can increase integration density , but also can reduce construction costs. Back in the late 1970s , foreigner proposed the idea which use multi-core optical fiber manufacturing high density fiber.However , because of the imperfect manufacturing technology , fiber affected by the residual stress , low mechanical strength , poor reliability, has not developed into practical and commercialization .Into the 1990s , fiber optic communication in the FTTH ( fiber to the home ) development has encountered higher cost of obstacles, and the intense competition in the copper.To overcome this obstacle , we must significantly reduce the cost of fiber optic cable manufacturing , and requires the development of high-density large armored fiber optic cable, in order to facilitate the laying of fiber optic cable and reducing installation costs . Thus, in 1994 , France Telecom proposed a new concept of multi core single mode and design a 4 core single mode fiber. In July 1994 made more than 100 kilometers Single Mode Fiber Cable, and use different core and structures fiber optic cables and non-fiber ribbon cable into the cable experiment. Compared with the common Single Mode Fiber, the cable density increase many times . Initially confirmed that the proposed multi core single mode fiber can reduce manufacturing costs while addressing the fiber optic cable and the development of high- density optical fiber optic cable. Since then, France Telecom and Alcatel have carried out a 4 core single mode optical fiber research and development , studyed from optical design, preform manufacture , drawing techniques , optical properties, a 4-pin cable, and mechanical connections from each a core of separation and termination of ordinary single-mode fiber and other aspects of a comprehensive. Currently, the cost per meter per core for $ 0.03 , while the cost per meter of ordinary single-mode fiber is $ 0.055. We can say that multi-core single-mode fiber forward practical development. This article focuses on the structure of multi-core single-mode optical fiber design, manufacturing processes and fiber properties, but also a brief introduction to the new fiber optic FTTH applications in the technical and economic advantages.

2. Design of multi core singlemode fiber

To meet the needs of FTTH systems. The design of multi-core fiber should meet the following key requirements: 1.31 um and 1.55um wavelength dual-window work; Crosstalk between each core is greater than -35 dB: precise geometry; Easy identification of each core and ordinary Single mode Fiber Optic Cable. Further, since the optical fiber length shorter in FTTH network (≤ l0 km), so the requirements for dispersion and attenuation of the fiber is relatively relaxed, there are strict requirements on bending and microbending losses. Each of the core are respectively located on the vertices of a square, the center of the square is the central axis of the multi core singlemode fiber. Each core is a single-mode optical fiber waveguides, cutoff wavelength 1.3 um.In order to reduce the bending loss and crosstalk, reinforce fiber molded capacity constraints, therefore compared with the conventional G652 optical fiber, the refractive index difference has increased. 3 core is a simple step structure, a refractive index difference 0.0062; another annular core refractive index profile, the refractive index difference 0.0l, this core is provided in order to facilitate identification of each of the cores.

The main advantage of multi-core Single Mode Fiber Cable

1. Attenuation coefficient

By the testing and research of nearly 200km long fiber , the attenuation coefficient of the multi core singlemode optical fiber reached levels close to the corresponding single core fiber.

2. Bending and micro-bending loss characteristics

Bending and microbending loss characteristics of the multi-core single-mode fiber optic is good, negligible additional loss introduced. This is due to the higher refractive index and limit the ability of a strong mold. Multi core single mode fiber optic in the l310nm and 1550nm wavelength mode field diameter was 8.4 ± 0.21un and 9.75 ± 0.25um, slightly smaller than the ordinary single mode optical fiber.

3. Crosstalk characteristics

To 30 g of tension around 15 cm in diameter optical fiber on ferrule l0 km optical fiber with characteristic measurement, crosstalk between each core at l 310 nm wavelength, less than-70dB; at 1 550 nm wavelength, less than a 50 dB, are excellent -35 dB in the required index. Even slim to the 30 km, between 0-30g tension variations, changes, crosstalk is also only a few dB.

4. Mechanical strength

Wth 10m length test, the average intensity of 70N. The conventional 125um fiber diameter of 60 N, it is because a large cross-sectional area of multi-core single-mode fiber. Fracture stress 4.6 GPa, 94% for the conventional 125 um diameter fiber.