What is Optical Fiber?

Optical Fiber? full name is called the optical fiber optical English name is OPTIC FIBER, also called OPTICAL FIBER is pure quartz with a special process to pull into filaments, fiber diameter, even smaller than a human hair, but its ability is very large, in a very short time a huge amount of information transfer.

According to the present level of progress. It has been realized in an optical fiber in the second pass hundreds of the information rate.Moreover, this rate is also far from the fiber transmission rate limits. Planing surface structure and fiber coaxial cable similar to, but didn’t mesh shield. Center is the glass core optical transmission. In the multi-mode fiber, core diameter is 15um-50um. The single-mode fiber core diameter of 8um-10um. Outside the core surrounded by a layer of off-color lower rate than the core glass envelope. In order to keep the core within the fiber. It is the use of the principle of total reflection of light. This signal energy loss. Then the outside is a thin plastic coat to protect the envelope. Fiber is often tied up outside a shell to protect. Cross-sectional area of quartz glass fiber core is very small double concentric cylinder, it crisp texture, easy to break,so out with a protective layer. Currently we usually use the fiber when the bandwidth utilization is
very low. the main reason is the computer are now run by integrated circuits, meaning that the computer is within the transmission power of digital signal.

Optical characteristics are: transmission speed, range, contents, and immunity against electromagnetic interferences, not afraid of thunder and lightning hit hard in the external eavesdropping, is not conductive, there is no ground between devices such trouble.

Fiber optic cable is a root of very fine quartz glass fibers, each fiber contained in the number of such glass fiber is the number of fiber core. Number of different specifications of the fiber core is not the same, generally from 2 core, 4 core, 8 core range to hundreds of cores. It also determines the scope and cost of optical fiber applications.

Then, we apply the number of core optical fiber, application of what type of fiber would be suitable then? Experience, most of the trunk optical fiber cores highest proportion of 8-core, and the mean number of trunk optical fiber core is 8-core. In LAN applications, approximately 80% in the form of Ethernet, so most users need a fiber channel requires only 2-core optical fiber transmission tasks can be completed.FDDI and a full 4-core optical fiber loop optical fiber is required. And most users to install fiber optic cabling systems have some redundancy to accommodate future expansion needs. In fact, the number of fiber core is difficult to tell the user what is the demand? Especially in the main application, in the final analysis, it all depends on the number of network equipment and fiber optic cabling fiber optic port on the complexity of installation.

Optical fiber loss can be divided into a fiber made from the natural wear and tear, and after the additional loss caused by conditions of use. Fiber can be divided into single-mode fiber (SMF), multimode fiber (MMF), long-wavelength low drive bulk fiber (LMF), plastic optical fiber (POF) and so are many, the scope of application vary, the most commonly used are the following specifications:

Wavelength:

1920 years ago, people only mastered the long wave and medium wave radio wave section, the application of electromagnetic waves and only the transmission cable, still images and a small amount of the phone. In 1930, it mastered the short wave. After that open up the UHF, microwave and millimeter-wave field, so high-capacity microwave and satellite communications have emerged. In general, almost every ten years to develop and master the human can be a new band.

For wireless communications, the information to rely on electromagnetic waves to transmit.In general, the higher the frequency of electromagnetic waves, can carry the greater amount of information. The higher the frequency, the shorter the wavelength of the corresponding.It is committed to the development of electromagnetic waves, from the long wave, medium wave to short wave, VHF, microwave, purpose is to send more information.

The figure is the wavelength of electromagnetic waves and names. Can be seen from the figure, light is the wavelength of a few millimeters from zero to about 0.1 micron wavelength range of electromagnetic waves.

Article source:http://www.fiber-optical-networking-products.com/