The Components And Modes Of Fiber Optic Cable
Consider that the capacity of a simple telephone line to carry data is equivalent to the flow of liquid through a drinking straw.It would take a tunnel large enough to drive a bus through to equal the bandwidth of a single fiber optic strand using today's technologies.Furthermore, if technology existed to fully utilize fiber optic capabilities,it would take a tunnel the diameter of the moon to handle the flow of its potential bandwidth.
Fiber optic cable carries optical pulses rather than electrical signals,An optical signal virtually eliminates any possible electrical interference,The potential for electronic eavesdropping is completely eradicated,Fiber optic cable lengths are measured in kilometers rather than meters,which greatly reduces the number of signal repeating devices required for long distance cable runs,One of the most impressive characteristics is the high volumes of data that can be pumped through optical fibers,All this makes fiber optic cable the medium of choice for many WAN applications ,where network traffic can cause major bottlenecks .In addition,there are many people who believe that fiber optic cables may become the norm rather the exception for interconnecting network devices on a LAN.
Fiber optic cable consists of three components:a fiber cord,cladding,and a protective outer sheath,The inner core is either glass or plastic is used when a flexible cable is needed ;however,plastic cable is more susceptible to attenuation than glass,which limits the length of the cable,Cladding provides a coating the keeps the light waves within the fiber,The outer protective jacket is used to protect the fiber inside. There are several types of fiber connector:LC,SC,ST,and MRJ.The fiber patch cord consist of one connector on each end.Such as the LC LC Fiber Patch Cord connection LC connector on both end.And some of the common patch cords are SC-ST single mode patch,SC-SC patch cord,and LC-SC Patch Cord .
Fiber optic cable comes in two forms, single and multiple mode,LC-LC Single Mode Patch Cord is best for applications that require great distances,this fiber is very narrow and requires an extremely focused source of data transmission that can keep the light waves on a straight, continuous patch.The narrow internal core makes room for one-way traffic only，This reduces obstacles that might interfere with the delivery of packets ,resulting in more reliable transmissions over longer distances,A laser is normally used as the generating source for single-mode transmissions because it can produce the narrow band of light needed.
Multimode fiber is a cheaper alternative to single mode because of lower cost transmission devices such as LEDs ,MMF has a larger core than does single mode ,which allows more room for the light signal to travel,allowing lower cost transmission devices,With a wider core and less precise light emitting sources ,there is more information loss due to light dispersion, A larger core allows the light wave to bounce around ,which results in shorter transmission distance ,However ,the connections to the fiber are easier to make to the larger core.MMF is ideal for shorter cable runs within a single building for LAN backbones.
