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Detail Of Single Mode And Multi Mode Fiber Optic Cable


In recent years fiber optic cable has become apparent that fiber-optics are steadily replacing copper wire as an appropriate means of communication signal transmission. They span the long distances between local phone systems as well as providing the backbone for many network systems. Other system users include cable television services, university campuses, office buildings, industrial plants, and electric utility companies.

There are three types of fiber optic cable commonly used:  single mode, multimode and plastic optical fiber (POF).  Although fibers can be made out of transparent plastic, glass, or a combination of the two, the fibers used in long-distance telecommunications applications are always glass, because of the lower optical attenuation.  Both multi-mode and single-mode fibers are used in communications, if you need to transmit less data over longer distances, use single mode fiber optic cables. For a greater data capacity over shorter distances, go with multi mode fiber optic cables, with multi-mode fiber used mostly for short distances (up to 500 m),Multi mode is often used for LANs and other small networks. And single-mode fiber used for longer distance links.

Single Mode Fiber: Single Path through the fiber

Single Mode cable is a single stand (most applications use 2 fibers) of glass fiber with a diameter of 8.3 to 10 microns that has one mode of transmission.  Single Mode Fiber with a relatively narrow diameter, through which only one mode will propagate typically 1310 or 1550nm. Carries higher bandwidth than multimode fiber, but requires a light source with a narrow spectral width.  Single Mode is also referred to as single-mode fiber, single-mode optical waveguide, mono-mode optical fiber and uni-mode fiber. Single-mode fiber gives you a higher rate of transmission, it also can carry the signal up to 50 times farther distance than multimode, at a slightly higher cost.Single-mode fiber has a much smaller core than multimode.

Single Mode fiber is used to connect long distance switches, central offices and SLCs (subscriber loop carriers, small switches in pedestals in subdivisions or office parks or in the basement of a larger building). Practically every telco’s network is now fiber optics except the connection to the home.

Multi Mode Fiber: Multiple Paths through the fiber

Multi-Mode cable has a little bit bigger diameter, with a common diameters in the 50-to-100 micron range for the light carry component (in the US the most common size is 62.5um).Typical multimode fiber core diameters are 50, 62.5, and 100 micrometers.  Multi Mode fiber is used for shorter distances. Most applications in which Multi-mode fiber is used, 2 fibers are used. Multimode fiber gives you high bandwidth at high speeds (10 to 100MBS – Gigabit to 275m to 2km) over medium distances. Light waves are dispersed into numerous paths, or modes, as they travel through the cable’s core typically 850 or 1300nm. Long cable runs (Above 3000 feet 914.4 meters in length), the multiple paths of light are believed to cause signal distortion at the receiving end, resulting in lost packets and incomplete data transmission. IPS recommends the use of single mode fiber in all applications using Gigabit and higher bandwidth.

For more information about single mode fiber cable or multimode fiber cable, such as single mode duplex fiber, multimode duplex fiber optic cable, OM3 fiber optic cable, OM4 multimode fiber, waterproof cable, fiber patch cable and so on. Pls contact FIBERSTORE sales at +86 (755) 8300 3611 or sales@fs.com.

Basic Technology About Fiber Optic Cable

From data and voice to security and videoconferencing, many of today’s IT infrastructure services rely on fiber optics to transmit information faster, farther, and in greater amounts than ever before. So fiber optics are more and more popularity in our internet. This post will try to answer some of the basic questions about fiber optic cable.

What is fiber optic cable?
A fiber optic cable is a network cable that contains strands of glass fibers inside an insulated casing. These cables are designed for long distance and very high bandwidth (gigabit speed) network communications. If you want to know more info about fiber optic cable specifications, you can visit the FiberStore “Fiber Optic Cable Tutorial” in our tutorial.

There are two types of optical fiber cables, Single-mode VS Multimode?
Single-mode fiber gives you a higher transmission rate and up to 50 times more distance than multimode, but it also costs more. Single-mode fiber has a much smaller core than multimode fiber-typically 5 to 10 microns. Only a single lightwave can be transmitted at a given time. The small core and single lightwave virtually eliminate any distortion that could result from overlapping light pulses, providing the least signal attenuation and the highest transmission speeds of any fiber cable type.

Multimode fiber gives you high bandwidth at high speeds over long distances. Lightwave are dispersed into numerous paths, or modes, as they travel through the cable’s core. Typical multimode fiber core diameters are 50, 62.5, and 100 micrometers. However, in long cable runs (greater than 3000 feet (914.4 ml), multiple paths of light can cause signal distortion at the receiving end, resulting in an unclear and incomplete data transmission. For example, you can try to compare the single mode duplex fiber vs multimode duplex fiber optic cable, and well know their different.

Relationship between fiber optic cable and fiber patch cord:
A fiber patch cord is a fiber optic cable capped at either end with connectors that allow it to be rapidly and conveniently connected to CATV, an optical switch or other telecommunication equipment. Its thick layer of protection is used to connect the optical transmitter, receiver, and the terminal box. This is known as “interconnect-style cabling”.

What types of connectors should be used?
There are a number of connector styles on the market including LC, FC, MT-RJ, ST and SC. There are also MT/MTP style connectors that will accommodate up to 12 strands of fiber and take up far less space than other connectors. This connector is intended for use with indoor loose tube no-gel cable constructions. However, the most popular connectors are SC, which push in then click when seated, and ST, also known as bayonet style, that are pushed in and twisted to lock. That should be a consideration when making product selections.

What kind of jacket rating and type do you require?
Fiber cable jackets come in many styles. As an example, fiber can be Indoor only, Outdoor only, Indoor/Outdoor, Tactical and it can also have Plenum or Riser ratings.

Jacket color is relatively standardized.
a) Multimode = Orange
b) 50/125um 10G = Aqua
c) Single Mode = Yellow
d) Indoor/Outdoor or Outdoor = Black
e) Custom jacket colors are also available for indoor fiber cables

Whether you are working in a residential or commercial environment. FiberStore offers a wide variety of fiber cables, and other fiber optic cables related prodcuts, such as fiber patch cable, fiber optic connector, fiber transceiver. No matter how complex or simple your installation needs are, we have the expertise to provide you with the right products and information for both your fiber optic cable, custom fiber optic assembly and fiber optic connector needs. If you wanna customize your fiber optic products, pls give us a call, our Tel is  +86 (755) 8300 3611 or sent your detail requirement email to sales@fs.com. Thank you!

Different Types Of Single Mode And Multimode Duplex Fiber

Fiber optic cables are the medium of choice in telecommunications infrastructure, enabling the transmission of high-speed voice, video, and data traffic in enterprise and service provider networks. Depending on the type of application and the reach to be achieved, various types of fiber may be considered and deployed, such as single mode duplex fiber and multimode duplex fiber optic cable.

Fibers come in several different configurations, each ideally suited to a different use or application. Early fiber designs that are still used today include single-mode and multimode fiber. Since Bell Laboratories invented the concept of application-specific fibers in the mid-1990s, fiber designs for specific network applications have been introduced. These new fiber designs – used primarily for the transmission of communication signals – include Non-Zero Dispersion Fiber (NZDF), Zero Water Peak Fiber (ZWPF), 10-Gbps laser optimized multimode fiber (OM3 fiber optic cable), and fibers designed specifically for submarine applications. Specialty fiber designs, such as dispersion compensating fibers and erbium doped fibers, perform functions that complement the transmission fibers. The differences among the different transmission fiber types result in variations in the range and the number of different wavelengths or channels at which the light is transmitted or received, the distances those signals can travel without being regenerated or amplified, and the speeds at which those signals can travel.

There are two different types of fiber optic cable: multimode and single-mode(MMF and SMF). Both are used in a broad range of telecommunications and data networking applications. These fiber types have dominated the commercial fiber market since the 1970’s. The distinguishing difference, and the basis for the naming of the fibers, is in the number of modes allowed to propagate in the core of a fiber. The “mode” is an allowable path for the light to travel down a fiber. A multimode fiber allows many light propagation paths, while a single-mode fiber allows only one light path.

In multimode fiber, the time it takes for light to travel through a fiber is different for each mode resulting in a spreading of the pulse at the output of the fiber referred to as intermodal dispersion. The difference in the time delay between the modes is called Differential Mode Delay (DMD). Intermodal dispersion limits multimode fiber bandwidth. This is significant because a fiber’s bandwidth determines its information carrying capacity, i.e., how far a transmission system can operate at a specified bit error rate.

The optical fiber guides the light launched into the fiber core (Figure 1). The cladding is a layer of material that surrounds the core. The cladding is designed so that the light launched into the core is contained in the core. When the light launched into the core strikes the cladding, the light is reflected from the core-to-cladding interface. The condition of total internal reflection (when all of the light launched into the core remains in the core) is a function of both the angle at which the light strikes the core-to-cladding interface and the index of refraction of the materials. The index of refraction (n) is a dimensionless number that characterizes the speed of light in a specific media relative to the speed of light in a vacuum. To confine light within the core of an optical fiber, the index of refraction for the cladding (n1) must be less than the index of refraction for the core (n2).

Fibers are classified in part by their core and cladding dimensions. Single mode duplex fiber have a much smaller core diameter than multimode duplex fiber optic cable. However, the Mode Field Diameter (MFD) rather than the core diameter is used in single-mode fiber specifications. The MFD describes the distribution of the optical power in the fiber by providing an “equivalent” diameter, sometimes referred to as the spot size. The MFD is always larger than the core diameter with nominal values ranging between 8-10 microns, while single-mode fiber core diameters are approximately 8 microns or less. Unlike single-mode fiber, multimode fiber is usually referred to by its core and cladding diameters. For example, fiber with a core of 62.5 microns and a cladding diameter of 125 microns is referred to as a 62.5/125 micron fiber. Popular multimode product offerings have core diameters of 50 microns or 62.5 microns with a cladding diameter of 125 microns. Single-mode fibers also have 125 micron cladding diameters.

A single-mode fiber, having a single propagation mode and therefore no intermodal dispersion, has higher bandwidth than multimode fiber. This allows for higher data rates over much longer distances than achievable with multimode fiber. Consequently, long haul telecommunications applications only use single-mode fiber, and it is deployed in nearly all metropolitan and regional configurations. Long distance carriers, local Bells, and government agencies transmit traffic over single-mode fiber laid beneath city streets, under rural cornfields, and strung from telephone poles. Although single mode duplex fiber has higher bandwidth, multimode fiber supports high data rates at short distances. The smaller core diameter of single mode duplex fiber also increases the difficulty in coupling sufficient optical power into the fiber. Relaxed tolerances on optical coupling requirements afforded by multimode fiber enable the use of transmitter packaging tolerances that are less precise, thereby allowing lower cost transceivers or lasers. As a result, multimode duplex fiber optic cable has dominated in shorter distance and cost sensitive LAN applications.

Overview Single Mode Duplex Fiber Cable

Duplex Fiber Optic Cables:

Duplex fiber cables consist of two fibers, either single mode duplex fiber or multimode duplex fiber optic cable, having their jackets conjoined by a strip of jacket material, usually in a zipcord (side-by-side) style. Use duplex multimode or singlemode fiber optic cable for applications that require simultaneous, bi-directional data transfer(One fiber transmits data one direction; the other fiber transmits data in the opposite direction). Duplex fiber is available in singlemode and multimode.

Duplex Fiber Optic Cables have two tight-buffered, up to 900 fibers surrounded by an aramid yarn strength member with a flame retardant outer jacket. The cable allows for flexibility and reliability for use in interconnect. The cable is designed to meet or to exceed the requirements of today’s premise wiring systems.

Duplex multimode fiber optic cable and singlemode duplex fiber cable alike are used for two-way data transfers. Larger workstations, switches, servers, and major networking hardware tends to require duplex fiber optic cable. Duplex cables can be more expensive than Simplex cables, and are compatible with any HDMI extender.

Single Mode Duplex Fiber Cable:

Single-mode duplex fiber optic cable is meant to transmit data over long distances with reliability and high speed. Single-mode cables only carry one ray of light at a time, which is what makes them better for long-distance transmissions. A duplex fiber cable consists of two fibers for simultaneous, bi-directional data transfers, earning the nickname of zip cord fiber optic cable systems.

Single mode duplex fiber is very similar to a multi-mode fiber cable in many ways, with the biggest difference being that the glass center of single-mode cables is significantly smaller, at about 10 microns in diameter. The smaller size is what allows these cables to transmit data across a distance of up to 40 miles with a bandwidth of 1Gbs. However, single-mode cables are usually more expensive than their multi-mode counterparts, so they’re not always a viable option.

As opposed to single-mode cables, which are smaller and are aimed at carrying data across longer distances, multimode cable is better for transmitting data across shorter distances. These cables are larger, and therefore have more bandwidth than their smaller counterparts. It’s important to note that you are capable of running multi-mode cable across a long distance, however, it can limit the bandwidth from 10Mhz to 30Mhz.

Choose the single-mode or multimode duplex fiber cable:

When deciding whether you should install single-mode or multi-mode cable, the first question to address is how far will the data be transmission? This may help in narrowing which optical fiber cable is needed for the project.

If you need to transmit data over a long distance, then single-mode bulk fiber cable is your best bet. With a core between 8 and 10 microns in diameter, these cables can transmit data up to 40 miles with a bandwidth of 1Gb’s. However, single mode transmitters typically use solid-state laser diodes.The higher cost of these optical emitters means that single-mode equipment can be anywhere from two to four times as expensive as multi-mode equipment. Multi-mode equipment will not launch (inject) enough light into a single-mode fiber since the light carrying core of this fiber is only 9 microns in diameter compared to 62.5 microns in diameter for multi-mode fiber. Multi-mode fiber optic cable bulk, which are larger and have more bandwidth, are capable of transmitting data over a few miles, but running the cable that far will limit the bandwidth from 10Mhz to 30Mhz. It’s important to consider all of these factors before you decide which type of fiber optic cable is best for you.

FiberStore is your fiber optic cable specialists. We provide a full range of fiber optic cable,such as a fantastic selection of singlemode duplex 9/125 fiber optic cable – ideal for low-loss, high bandwidth transmissions over long distances.Do you want to know more info about cost of fiber optic cable or fiber optic cable specifications,pls focus on our blog or our company .