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:

 

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

  The product about 50/125mm OM2 Multimode Fiber
 
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 Cable. 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.

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.