Fiber Optic Wiki

NO-EPOXY AND NO-POLISH

October 22, 2011

These connectors are the fastest and easiest to install. They are well suited for technicians and contractors who cannot cost justify the training and supervison needed for standard connectors. These are also a go solution for fast field restorations. They are available in ST, SC, FC, LC and MTRJ connectors.

CONNECTORS / TERMINATIONS WITH FIBER GLOSSARY

October 22, 2011

Aramid Yarn: Yellow fibers that provide cable tensile strength, support and additional protection for the optical fiber bundle. Kevlar? is particular brand of aramid yarn.

CONNECTORS / TERMINATIONS WITH FIBER GLOSSARY (2)

October 22, 2011

Bandwidth: The highest frequency that can be transmitted by an analog system. Also, the information-carrying capacity of a system (especially for digital systems). The range of frequencies within which a fiber optic waveguide or terminal device can transmit data or information.

TYPES OF OPTICAL FIBERS

October 21, 2011

Single Mode Fiber Optic Cable Multimode Fiber Optic Cable Step Index Multimode Graded Index MultimodePlastic Optical Fiber (POF) .

Multi-mode Fiber

October 21, 2011

Multi-mode fiber is pretty much what it says. It has multiple paths through the fiber. Each path stays confined to the core as the cladding has a lower refractive index. The refractive index is the measure of the cable’s ability to bend the light as it goes down the fiber. There are two types of multimode fiber, graded index and step index. The light ray will bounce in it’s path in a zig zag or helical appearance (depending on which fiber is used) and the light rays will be reflected back into the core if they encounter the cladding at a shallow angle. Any light ray that exceeds what is called a “critical” angle will escape from the fiber. Multimode fiber has a larger diameter with the more common diameters in the 50 to 100 micron range. The most common diameter in the United States is 62.5um. However, in long cable runs (greater than 3000 feet, multiple paths of light can cause signal distortion at the receiving end. This results in an unclear and incomplete data transmission. Designers now call for single mode fiber in new applications using Gigabit and beyond.

ADVANTAGES / DISADVANTAGES (of single mode vs multi-mode)

October 21, 2011

The use of Single Mode Fiber is the best way to get rid of Intermodal Dispersion. With Single Mode fiber there is only only 1 mode or ray of light being propagated down the fiber. It is a single straight light wave with little to no chance of the light leaving the fiber. The single core also creates higher bandwidth and the ability to travel greater distances.

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