Currently,as described,fiber is categozied into two groups:single-mode and multi-mode fiber,nevertheless ,there exists another kind of fiber like the POF .The mode refers to the path a photon takes in going from one side of the fiber to the other.According to the connection can be divided into:SC,ST, LC LC Fiber Patch Cord ,etc.

Single-Mode Fibers(SMF),In this type of fiber, all photons take the same path along the fiber,This is because the center of the fiber is very narrow.According to the ANSI the fiber has 8.5 micron core with 125-micron cladding. This factor reduces the signal loss and the ISI.Therefore,with single-mode fiber used primarily in telecommunications networks,fibers are characterized by long distance links and high capacity. LC-LC Single Mode Patch Cord are use as pigtails ,patch cords and jumpers to terminate directly into opto-electronic transmitters,receivers and other active and passive components.

It is the most reliable medium,but it has an important drawback for the fact that,at this moment,it is not clear that SFF connectors perform well with SMF connect two SMFs to the field ,As fabrication processes are improving quickly,it will be possible to have enough conncentricity in fibers as to connect them aligning their calddings.

Advantages of using SMF are well known:

Its bandwidth is enough to support,not only the current traffic but also the future one.

Greater distance:fiber can be run several kilometers.

Low attenuation:Light signals meet little resistance,so data can travel faster it has also some drabacks that can be reduced to one:

The core diameter is very small so,problems to access every home will arise.

The narrow size of the core causes that other elements of the system.

Currently,due to the great demand for increasing bandwidth,it has prompted the release of the 802.3z standard for Gigabit Ethernet over to allow the proper propagition of the laser VCSEL light along the multimode fiber.

The Mode conditionning patch cord is designed for long wave multimode applications of Gigabit Ethernet,It is compliant with this IEEE 802.3z application standard,This patch cord consists of connectors on each end of a cable assembly with single-mode fiber offset to a multimode fiber connection point in between.

The need for this patch cord is due to the single mode launch natrue of the LX or long wave transceiver modules used for gigabit ethernet,These modules have to operate for both center of a multimode fiber can cause multiple signals that confuse the receiver at the other end of the fiber,these multiple signals ,caused bu differentialmode delay effects,severely limit the cable distance lenghts for operating Gigabit Ethernet ,A mode conditionning patch cord eliminates these multiple signals by allowing the single-mode launch to be offset away from the center of a multimode fiber.bend in a fiber is function of the refrative index of the core and surrouding clading.Handling problems:it will become particularly acute for fiber to the home.for example the ends of the fiber must be perfectly aligned and as clean as possible.

Several different types of connectors are available for fiber optic patch cables such as LC,FC，to name a few。However,the two most common types of fiber-optic connectors in use today are the ST conector and the LC-SC Patch Cord ,notice that ST conector uses a barrel BNC -type adapter and the LC SC uses a block-style adapter.

Posted by: mikofy at 04:12 AM | No Comments | Add Comment
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