Question : Single mode and Multi mode fiber

How long can the single mode fiber provide ? and what's about multimode ?

There are only two type of fiber , single and multi , right ?

And Which color is for single and multi mode fiber ? Is it standard ? If not so, How to see which fiber line is single or multi mode ?

Answer : Single mode and Multi mode fiber

Hi,

Fiber optic cable is a completely different type of network medium. Instead of carrying signals over copper conductors in the form of electrical voltages, fiber optic cables transmit pulses of light over a glass or plastic conductor. Fiber optic cable is completely resistant to the electromagnetic interference that so easily affects copper-based cables. Fiber optic cables are also much less subject to attenuation than are copper cables. Attenuation is the tendency of a signal to weaken as it travels over a cable. The longer the cable, the weaker the signal gets. On copper cables, signals weaken to the point of unreadability after 100 to 500 meters (depending on the type of cable). Some fiber optic cables, by contrast, can span distances up to 120 kilometers without excessive signal degradation. This makes fiber optic the medium of choice for installations that span long distances or that connect buildings on a campus. Fiber optic cable is also inherently more secure than copper, because it is not possible to tap into a fiber optic link without affecting the normal communication over that link.

A fiber optic cable consists of a clear glass or clear plastic core that actually carries the light pulses, and is surrounded by a reflective layer called the cladding. Around the cladding is a plastic spacer layer, a protective layer of woven Kevlar fibers, and an outer sheath.

There are two primary types of fiber optic cable, called singlemode and multimode. The difference between the two is in the thickness of the core and the cladding. The measurements are the primary specifications used to identify each type of cable. Singlemode fiber typically has a core diameter of 8.3 microns, and the thickness of the core and cladding together is 125 microns. You will generally see this referred to as 8.3/125 singlemode fiber. Multimode fiber is usually rated as 62.5/125.

Singlemode fiber uses a single-wavelength laser as a light source, and as a result, it can carry signals for extremely long distances. For this reason, singlemode fiber is more commonly found in outdoor installations that span long distances, such as telephone and cable television networks. This type of cable is less suited to LAN installations because it is much more expensive than multimode and has a higher bend radius, meaning that it cannot be bent around corners as tightly. Multimode fiber, by contrast, uses a light emitting diode (LED) as a light source instead of a laser and carries multiple wavelengths. Multimode fiber cannot span distances as long as singlemode, but it bends around corners better and is much cheaper.

Installing fiber optic cable is very different from any copper cable installation. The tools and testing equipment required for installation are different, as are the cabling guidelines. Generally speaking, fiber optic cable is quite a bit more expensive than twisted pair or coaxial in every way, although prices have come down in recent years.

As far as I know there are no standard colors for either one.
I hope this answer your question!