Tag Archives: glass fiber cable

Multimode OM4 Cable Is Available For 40G Or 100G applications


There are different categories of graded-index multimode glass fiber cable, including OM1, OM2, OM3 and OM4 cables (OM stands for optical multi-mode). OM1 specifies 62.5-micron cable and OM2 specifies 50-micron cable. These are commonly used in premises applications for shorter reach 1Gb/s networks. But OM1 and OM2 cable are not suitable for today’s higher-speed networks. OM3 and OM4 are both laser-optimized multimode fiber (LOMMF) and were developed to accommodate faster fiber optic networking such as 10, 40, and 100 Gbps. Both are designed for use with 850-nm VCSELS (vertical-cavity surface-emitting lasers) and have aqua sheaths.

OM3 specifies an 850-nm laser-optimized 50-micron cable with an effective modal bandwidth (EMB) of 2000 MHz/km. It can support 10-Gbps link distances up to 300 meters. OM4 specifies a high-bandwidth 850-nm laser-optimized 50-micron cable an effective modal bandwidth of 4700 MHz/km. It can support 10-Gbps link distances of 550 meters. 100 Gbps distances are 100 meters and 150 meters, respectively.

What Makes OM4 Different?

OM4 fiber, with its higher bandwidth, has an extremely precise refractive index profile, virtually free of perturbations or defects. Just like OM3, OM4 is a 50-micron, considered to be laser-optimized multimode fiber for use with VCSELs. The key difference of OM4 from OM3 is in the refractive index of the fiber, which is more precisely graded to better equalize the arrival time of the light modes traveling at various speeds along the core of the fiber. Mode equalization depends on how well the graded index profile is constructed during fiber manufacturing. The better the modes are equalized, the higher the bandwidth of the fiber. This translates to higher bandwidth and a 550-meter reach for 10Gb/s (with some vendors claiming a 600-meter reach) and a 150-meter reach for 40/100 Gig, compared to 300 and 100 meters respectively for OM3.

You can use OM2 fiber with VCSELs, but its performance is limited to 550 meters at 1 Gb/s and only 82 meters at 10 Gb/s, compared to OM4 fiber’s reach of over 1000 meters at 1 Gb/s and 550 meters at 10 Gb/s.

OM3 and OM4 fibers are selected as the only multimode fiber for 40G/100G applications, which are the development trends of fiber optic communication. The 40G and 100G speeds are currently achieved by bundling multiple channels together in parallel with special multi-channel (or multi-lane) connector types. This standard defines an expected operating range of up to 100m for OM3 and up to 150m for OM4 for 40 Gigabit Ethernet and 100 Gigabit Ethernet. The OM3 and OM4 fibers are optimized for 850-nm transmission and have a minimum 2000 MHz.km and 4700 MHz.km effective modal bandwidth (EMB), respectively. Two EMB measurement techniques are used today for the bandwidth measurement. The minimum effective modal bandwidth calculated (EMBc) method, in our opinion, offers a more reliable and precise measurement compared to the differential mode delay (DMD) mask technique. With minEMBc, a true scalable bandwidth value is calculated that can reliably predict performance for different data rates and link lengths. With a connectivity solution using OM3 and OM4 fibers that have been measured using the minEMBc technique, the optical infrastructure deployed in the data center will meet the performance criteria set forth by IEEE for bandwidth.

OM4 cable is also especially well suited for shorter reach data center and high performance computing applications, which is the best option for the small percentage for users running 10Gb/s over links between 300 and 550 meters (or the even smaller percent who anticipate running 40 or 100Gb/s between 100 and 150 meters).

New Fiber Optic Cable – The Advantages Of The Hollow Fiber Cable


Along with the continuous development of optical fiber communication, optical cable also in constant development. Fibre is a communication cable, composed by two or more glass fiber cable or plastic optical fiber core within the cladding of the fiber core is located in the protective outer sleeve, plastic PVC covering. Along the internal optical fiber signal transmission is generally used infrared.Fiber optic cables are usually made of glass or plastic but those materials actually slow down the transmission of light ever so slightly.

New Type Optical Fiber Cable:

Recently, researchers at the university of Southampton, UK, have created a kind of hollow optical fiber cable. This kind of equipment in the middle is hollow, only by filling up the air, but its transport rate is 1000 times faster than the other fiber optic cable. Researchers revealed that light in the air velocity is about 99.7% of its speed in a vacuum.

The idea was not be put forward recently, but in the past when encountered in the process of light transmission in the corner, the signal will always diminish. The researchers optimized the design, making the new type of hollow optical fiber cable data loss is 3.5 dB/km, such an ideal level. In this way, making it suitable for use in supercomputer and data center applications.

Hollow fiber optic cable(indoor/outdoor fiber optic cable) can go through air rather than light, therefore in many areas it has much more advantages than the traditional optical fiber and will eventually replace the traditional optical fiber.

Using hollow optic fiber cable, rather than the traditional high purity silica doped fiber core, its advantage are optical fiber performance is not restricted by material characteristics of the fiber core. Traditional optical damage threshold, the parameters such as attenuation and group velocity dispersion and nonlinear effects are affected by the silicon materials and other corresponding parameters. Through reasonable design, hollow fiber can achieve more than 99% of the light in the air instead of in the glass, thus greatly reduce the material properties of optical fiber properties. So in many important areas, hollow fiber optic cable transceiver have more advantages than the traditional optical fiber.

Theoretically, this kind of fiber optic cable no fiber core, reduced the loss, to increase the communication distance, preventing the dispersion caused by the interference phenomenon, can support more wavelengths, and allows the stronger light power injection, estimate its communications capacity can reach 1000 times of the cable at present.

Promote hollow optic fiber cable of the ongoing research, with the extensive application of optical fiber and cable, the fiber optic cable has been unable to meet the needs of the people, therefore, need to continue to study new fiber optic cable in order to adapt to the needs of people.Researchers at the University of Southampton in the UK have created a hollow fiber-optic cable.From FiberStore,we supply many different types of fiber optic cables, and customers have the flexibility to choose a cable plant to best fit their needs.If you need some cables,welcome to Fiberstore to find it.