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Difference Between OS1 and OS2 Single Mode Fiber Cable


As we all know, multimode fiber is usually divided into OM1, OM2, OM3 and OM4. Then how about single mode fiber? In general, single mode fiber is categorised into OS1 and OS2. OS1 and OS2 are cabled single mode optical fibre specifications. In fact, there are many differences between OS1 and OS2 single mode fiber. This text will make a comparison between them and then give you a guide on how to choose the right one for your applications.

OS1 single mode fibers are compliant with ITU-T G.652A or ITU-T G.652B standards. Besides, the low-water-peak fibers defined by ITU-T G.652C and G.652D also come under OS1 single mode fibers. That is to say OS1 is compliant with specifications of ITU-T G.652. However, OS2 single mode fibers are only compliant with ITU-T G.652C or ITU-T G.652D standards, which means OS2 is explicitly applied to the low-water-peak fibers. These low-water-peak fibers are usually used for CWDM (Coarse Wavelength Division Multiplexing) applications.

OS1 and OS2 Single Mode FibreBesides the standards, the main difference between OS1 and OS2 single mode fibers is the cable construction. Typically, OS1 cabling is tight-buffered construction, which is usually used for indoor applications, such as campus or data centre. Yet OS2 cabling is loose-tube design. Cable with this construction is appropriate for outdoor cases like street, underground and burial. For this reason, OS1 indoor fibre has greater loss per kilometre than OS2 outdoor fibre. In general, the maximum attenuation for OS1 is 1.0 db/km and for OS2 is 0.4db/km. As a result, the maximum transmission distance of OS1 single mode fiber is 2 km but the maximum transmission distance of OS2 single mode fiber can reach 5 km and is up to 10 km. Then for all these reasons, OS1 is much cheaper than OS2. There is point need to pay attention to is that both OS1 and OS2 single mode fibers over their distance will allow speeds of 1 to 10 gigabit Ethernet. All of these differences between OS1 and OS2 discussed above are listed in the table below. You can get a clear understanding from it.

Name OS1 OS2
Standards ITU-T G.652A/B/C/D ITU-T G.652C/D
Construction Tight buffered Loose tube
Application Indoor Outdoor
Attenuation 1.0db/km 0.4db/km
Distance 2 km 10 km
Price Low High

Learning about the differences between OS1 and OS2 single mode fiber cable, then which cable should you choose? First, if you want to use for indoor application, OS1 is better for you. However, if used for outdoor application, you should choose OS2. Second, there is no benefit to be gained in using OS2 cable if under 2 km. OS2 is best for distance over 2 km. Finally, you should note that OS1 is much cheaper than OS2. In order to save cost, if the OS1 is enough for your application there is no need to use OS2. Fiberstore offers OS1 and OS2 single mode fiber patch cable as well as all kinds of multimode fiber patch cable. It is your optimal selection.

Related Article: What are OM1, OM2, OM3 and OM4 multimode fiber?

The Characteristics Of Singlemode and Multimode Fiber

Fiber is short for optical fiber, it is a new kind of optical waveguides, it is optical communication system that most common and most important transmission medium.

It consists of a single glass core, the cladding layer close to the core, a primary coating layer and a protective layer composed of plastic cap.(Cylindrical fiber, the core, cladding and coating layers composed of three parts.) Core and the cladding layer consists of two different optical properties of the medium constituting the medium refractive index of light than the interior of a surrounding medium high refractive index. In the periphery of the package as the cover layer of opaque material, as the light is prevented from escaping from the surface during interspersed.

Multimode Optical Fiber

When the geometry of the fiber is much larger than the wavelength of light (about lμm), optical transmission process will be a significant presence of dozens or even hundreds of transport modes, such as the fiber is called multimode Fiber Optic Patch Cables.

Due to different propagation modes having different phase propagation velocity, thus, long-distance transmission is generated through mode dispersion (after long-distance transmission delay difference is generated, resulting in the optical pulse broadening). Side mode dispersion will narrow the bandwidth of multimode fiber, the transmission capacity is reduced, and therefore, multi-mode fiber is only suitable for low speed, short-distance optical fiber communication, data communication is currently a large number of multi-mode optical fiber local area network.

Main products and application performance of multimode fiber in the following table:

Multimode Fiber
The related products about 62.5/125mm Multimode Fiber Patch Cable from fs.com, it is below:

Duplex OM1 62.5 125 Fiber Patch Cable

The product about  50/125mm OM2 Multimode Fiber

Duplex OM2 50 125 Fiber Patch Cable

Single Mode Fiber Cable

When the geometry of the fiber is small, and the wavelength of the same order as the core diameter in the range of 4-10μm, the optical fiber allows only one mode (basic mode) in which the transmission, the remaining high-order mode are all turned off, so that said Single Mode Fiber Cable. Avoid the mode dispersion single mode fiber, suitable for large-capacity long-distance transmission.

IEC 60793-2 and IEC 60793-2-50 singlemode fiber will be divided into B1.1, B1.2, B1.3, B2, B4, B5, B6 and other categories, ITU-T also G.652, G .653, G.654, G.655, G.656, G.657 and other recommendations were standardized definition and characteristics of various single-mode fiber, and each part of the GB / T 9771 with reference to IEC 60793-2-50 ITU-T G.65x series formulation.

A given type of single mode fiber, the mode field diameter by (also called effective area), the dispersion coefficient, dispersion slope, wavelength cutoff adapted to optimize the parameters, and access ways for different applications.

Key Technologies And Development of Multi-mode Optical Fiber

Corning and Lucent and other large companies proposed a “new generation of multi-mode fiber” concept to the international standardization bodies. A new generation of Multimode Fiber Patch Cable standards drafted by the International Organization for Standardization / International Electrotechnical Commission (ISO / IEC) and the Telecommunications Industry Alliance (TIA-TR42). As a new generation of multi-mode fiber transmission medium 10Gb / s Ethernet, be included in IEEE 10Git / s Ethernet standard. This article will briefly describe the new generation of multi-mode fiber critical technical information.

1.1 The Typle of New Generation of Multimode fiber

The new generation of Multimode Fiber Cable is 50/125μm, graded-index multimode fiber distribution. The number of this transmission mode Fiber Optic Cables is approximately 62.5μm multimode fiber transmission mode 1/2.5. This can effectively reduce the dispersion of the multimode fiber mode, increase the bandwidth. For 850nm wavelength, 50/125μm Multimode fiber bandwidth is 500MHz.km. Recent experiments confirmed: the use of 850nm vertical cavity surface emitting laser (VCSEL) as a light source in the 1Gb / s rate, 50μm multimode fiber core diameter standard error can be no transfer 1750m, 50μm core diameter multimode fiber can be a new generation of error-free transmission 2000m. In the 10Gb / s down, 50μm core diameter multimode fiber can transmit a new generation of 600m. A new generation of multi-mode fiber is mainly used to support high-speed Ethernet (Ethernet), Fibre Channel (FC) and fiber optic interconnection (OIF). Meanwhile at 10Gbit / s system can transmit 600m, so that it can be used for building backbone and campus backbone extraordinary distance from the middle. In the data center design, within a distance of 100m to support higher speed (40G and 100Gbits / s? Ethernet, 16G and 32Gbits / s Fibre Channel) data transmission requirements.

The related products about New Generation Multimode fiber, SMA905-ST Duplex 50/125 Dia2.5mm OM2 Multimode Fiber Patch Cable from fs.com, the products picture is below:

OM2 Multimode Fiber

The SMA-905 fiber optic patch cord, also known as FSMA connector, was one of the First fiber optic interconnect system that gained industry wide acceptance.SMA905 fiber patch cords make use of threaded connections and is still widely used for military, industrial, medical and Surgical applications and laser systems because of their low cost multimode coupling. It features simple termination and Assembly, and is TIA and IEC compliant. SMA 905 multimode connectors are available with stainless alloy or stainless steel ferrules.

1.2 A New Generation of Multi-mode Fiber Source

Traditional multimode fiber networks use light-emitting diode (LED) as light source . In low-speed network, which is an economically rational choice. However, LED is spontaneous emission light, the radiation -emitting laser is excited , the carrier lifetime is longer the former than the latter, and thus the LED modulation rate is limited , and not more than gigabit networks. Further, LED compared with a laser, the beam divergence angle, wide spectral width . After injection of multimode fiber , excite more high-order mode, the introduction of more wavelength components, so that the fiber bandwidth decreases . Fortunately 850nm vertical cavity surface emitting laser (VCSEL) not only has the advantage of these lasers, but aslo the price is basically the same with the LED. Other advantages of VCSEL are: low threshold current, may not be enlarged, driven directly by logic gates at 10Gb / s rate, get a few milliwatts of output power; emission wavelength of 850nm which does not apply to the standard single-mode fiber just for multimode fiber . At this wavelength, an inexpensive silicon detectors can be used and have a good frequency response; VCSEL another remarkable advantage is that the manufacturing process can be easily controlled distribution of the emitted light power , which is very advantageous for improving the bandwidth of MMF. It is because of these advantages, the new generation of multimode fiber standard will use 850nm VCSEL light source .

1.3 The Bandwidth Distance of New Generation Multimode Optical Fiber

By comparing the above- described laser and LED , the use of multimode fiber laser light source, the transmission bandwidth should be greatly improved. However, experimental results show that simply make the bandwidth of a laser instead of LED light source, system is not only reduced but increased. IEEE Expert Group found through research, the bandwidth of multimode fiber and the optical fiber or the injection molding state of a power distribution. The preform fabrication process, the refractive index of the fiber axis prone to depression. Done before light source LED, is overfilled launch (OFL-Over Filled Launch), all of the fiber mode ( hundreds ) are excited to bring their own part of each module power. The refractive index of the fiber center delay characteristic distortion affects only a small number of models, the relatively limited impact on the modal bandwidth of the fiber. The measured multimode fiber bandwidth for the use of LED light source system is correct. However, when a laser light source, a laser beam spot is only a few microns, the divergence angle is smaller than the LED, so that only a small number of modes excited in the center of the fiber transmission, each mode carries a large part of the power, the refractive index of the fiber center distortion affect a small number of patterns of delay characteristics, so that decreased multimode fiber bandwidth. So it can not be measured with a laser light source for multimode fiber OFL bandwidth of conventional methods.

Today a new generation of multi-mode fiber main measurement bandwidth limit die by injection method (RML-Restricted Mode Launch). In this way the measured bandwidth is called ” laser -bandwidth ” or ” modal bandwidth limit “, previously done with the LED light source measured bandwidth is called “OFL bandwidth is .” Both represent the bandwidth of multimode fiber laser and LED light source with a time of injection. August 5, 2009, TIA Standards Committee released a new generation of bandwidth distance product standard multimode fiber , 850nm laser distance -bandwidth product of 470MHz.km, 850nm OFL bandwidth of distance product of 350MHz.km, 1300nm OFL bandwidth of distance plot to 500MHz.km. Incidentally, the bandwidth from the product of the above-described generation of the multi-mode fiber is only 3dB corresponding baseband bandwidth of multimode fiber, multimode fiber does not take more than a high-frequency band -pass region is also used when the transmission signal . Today, by orthogonal frequency division multiplexing (OFDM) technology , can make good use of multimode optical fiber through a high frequency band region , under conditions of use of the same Fiber Optic Patch Cables type, transmission using high frequency band signal through region greatly improved multi-mode fiber transmission capacity.

1.4 Source Injection Method

In actual use, the multimode fiber coupled laser and the following methods:

Bias injection: In order to avoid the deterioration of these lasers is injected directly into the bandwidth MMF appears, use the mode regulator
Connection (MCP Mode Conditioning Patch Cable), the laser output is coupled into a multimode fiber. Connection-mode regulator is a short Single Mode Fiber Cable, one end of which is coupled with the laser and the other end coupled to a multimode optical fiber. SMF output spot detouring from the multimode fiber axis at a distance, allowing the deviation from the range is 17 ~ 24μm, the aim is to avoid the center of the refractive index depression, but do not deviate too far, only one group is selectively lower-order mode excitation .

Centre injection: ideal for the refractive index profile, there is no central depression MMF can be used instead of the center of the injection molding
Regulator connection. The advantage of this is that the bandwidth of the laser can effectively improve the MMF to reduce the complexity of the network system and reduce system cost, a current-mode regulator 80 to the connection of approximately U.S. $ 100. Corning launched InfiniCor CL 1000 (62.5μm core diameter) and InfiniCor CL 2000 (50μm core diameter) is Gigabit Ethernet 1300nm wavelength laser directly into the mode without adjusting the first multi-connection mode fiber.

Single Mode And Multimode Fiber Optic Patch Cord From PriceCable

What is optical fiber patch cord? “Fiber Optic Patch Cord is a fiber optic cable that can be directly connected to other equipment for connecting and managing convenience. It is used for making patch cords from equipment to fiber optic cabling. Having a thick layer of protection, it is used to connect the optical transmitter, receiver and the terminal box.” we know that in the internet.

Fiber optic patch cord is one of most commonly used components in fiber optic network. Fiber optic patch cords sometimes is also called fiber optic jumper or fiber optic patch cables. Generally there are two types of fiber optic patch cords: single mode fiber optic patch cords and multimode fiber optic patch cords. Here the word mode means the transmitting mode of the fiber optic light in the fiber optic cable core. Usually single mode fiber optic patch cord are with 9/125 fiber glass and is yellow jacket color, multi mode fiber optic patch cord are with 50/125 or 62.5/125 fiber glass and is orange color.

Single Mode Fiber Optic Patch Cable:

single mode Fiber Optic Patch Cord use 9/125 micron bulk single mode fiber cable and single mode fiber optic connectors at both ends. Single mode fiber optic cable jacket color is usually yellow.When the fiber core is so small that only light ray at 0° incident angle can stably pass through the length of fiber without much loss, this kind of fiber is called single mode fiber. The basic requirement for single mode fiber is that the core be small enough to restrict transmission to a singe mode. This lowest-order mode can propagate in all fibers with smaller cores (as long as light can physically enter the fiber).

The most common type of single mode fiber has a core diameter of 8 to 10 μm and is designed for use in the near infrared (the most common are 1310nm and 1550nm). Please note that the mode structure depends on the wavelength of the light used, so that this fiber actually supports a small number of additional modes at visible wavelengths. Multi mode fiber, by comparison, is manufactured with core diameters as small as 50um and as large as hundreds of microns.

Multimode Fiber Optic Patch Cable:

Multimode fiber patch cable use 62.5/125 micron or 50/125 micron bulk multimode fiber cable and terminated with multimode fiber optic connectors at both ends. Multimode fiber patch cord,may be the cable preferred by most common local fiber systems because the devices for the reason that they are much more cheaper.

Multi-mode optical fiber is a type of optical fiber mostly employed for communication over short distances, such as within a building or on the campus. Typical multimode links have data rates a lot more than sufficient for almost all premises applications. Due to the high capacity and high reliability, multimode optical fiber is used for building the backbone network application. More and more users to take closer to consumers by running toward the desktop or into the area of the advantages of fiber in the fiber. Standards-compliant architectures such as Centralized Cabling and fiber towards the telecom enclosure offer users the opportunity to leverage the distance capabilities of fiber by centralizing electronics in telecommunications rooms, rather than having active electronics on each floor. Multimode fiber is usually, orange or grey, having a cream of black connector along with a short transmission distance.

If you have any questions with fiber optic patch cord,please visit PriceCable.com contact us.