Benefits of Loose Tube Cable

Around the tube is a layer of Kevlar which provides tensile strength, and on the outside is an overall sheath made of high density plastic. One or more fibers with 250 micron jackets are installed in the tubes, and the fibers are a little longer than the cable itself, so that strain on the cable which might stretch the cable does not stretch the fibers. In most cases, all the spaces inside the tubes and other places in the cable are filled with a gel which serves to block water and support the fibers in the tubes.

In loose tube construction, the fiber (usually the 250um coated fiber) is contained in a color-coded, flexible plastic tube that has an inner diameter considerably larger than the fiber itself. Up to 12 of these fibers can be put inside a tube, and is usually filled with a gel material that prevents water penetration. These tubes are standed around a dielectric or steel central member to provide more flexibility. Aramid yarn is used as the primary tensile strength member. An outer polyethylene jacket is wrapped over the assembly. Polyethylene is the most common for outdoor cables due to high moisture resistance, abrasion resistance, and stability over a wide temperature range.

The loose tube provides the protection needed for the inner fiber from the exterior mechanical forces acting on a cable by isolating them. Several loose tube cables are often combined with strength members to form a multifiber assembly, and this provides additional protection from stress, and minimizes elongation and contraction. By cutting several fibers slightly longer than the loose tube length and braiding them inside the loose tube, the shrinkage due to temperature variation can be controlled while insulating the fibers from the stresses of installation and environmental loading. This would be a big advantage in outdoor applications, which is why most outdoor fiber optic systems have a loose tube configuration. Loose tube cables are normally used for outside-plant installtion in aerial, duct and direct buried applications.

The loose tube configuration is ideal for modular designs, as each tube can hold up to 12 fibers. With multiple tubes in a cable, this could add up to more than 200 fibers. With a modular design, certain groups of fibers can be routed to intermediate points without interfering with other protected buffer tubes being routed to other locations. The color-coded scheme in loose tube cable assemblies allows for easy identification and administration of fibers in the system.

The loose tube type offers a higher level of isolation from external forces, and when subjected to continuous mechanical stress, it has more stable transmission characteristics. For any given fiber, the effects of micro-bending on cable attenuation are lower. But the main reason the loose tube type is used outdoors is that it exhibits greater stability over temperature variations.

The principle disadvantage of the loose tube cable relates to connectorization. Because of the small fiber jacket size and the use of multiple fibers in a tube, connectors “can not” be installed directly on the fibers. (I have seen it done, but it is not recommended because the very small diameter plastic jacket gives virtually no protection to the fiber, and provides little surface area for the connector to grip.) As a result, the extra step of splicing pre-connectorized pigtails to the cable is commonly used. This makes connectorizing the loose tube cable more expensive than the tight buffer cables. Note that this does not apply to splices joining two cables together, though removing the gel from the fibers and tubes does slow the splicing and connectorization processes. Note also that the majority of loose tube cables are NOT fire rated for indoor use at all, so when a loose tube cable enters a building, it either has to be run in conduit or spliced to a fire rated cable.

We are FiberStore Inc. If you would like to know more about optical fiber cables information and dont know where to buy fiber optic cable, please visit our website and contact us. We also supply fiber jumpers and fiber pigtails. Welcome to contact us.

About Fiber Optic Pigtail

Fiber optic pigtails are recommended or sometimes required when there is a need to make a transition from thin buffered fibers (250-900um), typical for distribution cables and not suitable for direct optical fiber connector termination, to cross-connection or equipment connection point. Pigtails mechanically or fusion connected to the distribution cable fibers simplify cabling system installation and servicing significantly. Fiber optic pigtails are used to achieve accurate mounting for precision alignment of fiber optical components. The fiber pigtails are usually used with fiber optic management equipment like ODF, splice closures and cross cabinets.

Fiber pigtail is piece of fiber optic cable with only one fiber optic connector on one side of the cable while leave the other side no connectors, so that the connector side can link to the equipment and the other side can be melted with optical fiber cables. Commonly used fiber optic pigtail types are SC, ST, FC, LC MT-RJ, SC/APC, FC/APC, E2000 fiber optic connectors. They are single mode types and multimode types.

Fiber optic pigtails the typical use is to link the fiber optic cable with fiber optic equipment, the fiber optic pigtail with connector side is used to link the equipment, while the other side of the pigtail is melted together with the fiber cable, by melting together the fiber glasses, it can reach a minimum insertion loss. Common types of fiber optic pigtails are usually with 0.9mm fiber cable diameter, and usually installed inside ODF unit. Most commonly used types are SC fiber optic pigtail, ST fiber optic pigtail,FC fiber optic pigail, LC fiber optic pigtail ,MT-RJ fiber optic pigtail,SC/APC fiber optic pigtail, FC/APC fiber optic pigtail and E2000 fiber optic pigtail.

Key Features

. Low insertion loss and back reflection loss
. Good exchangeability
. Good durability
. High temperature stability
. Compliant to IEC, TIA/EIA, NTT and JIS specifications
. Multimode and singlemode fibers
. Suitable for fusion or mechanical splicing


Types: single mode, multimode
Terminations: FC, SC, ST, MU, LC, D4, DIN, E2000, MT-RJ, MPO, SMA, E2000
Insertion Loss (dB): less than 0.2 (PC and UPC)
Exchangeability: less than 0.2dB
Tensile Strength: less than 0.2 dB (0 to 15 kgf)
Temperature Range: -40℃ – +85℃

FiberStore INC. offer the waterproof fiber optic pigtail, they are produced strictly according to IEC standards, the products feature low insertion loss, high return loss, good interchangeability and repeat push-pull performance, which make them easy to use. The waterproof fiber optic pigtails are with strong jacket and waterproof sealed head connectors; they can be used in harsh environment. What’s more we also offer the fiber jumpersMPO cable and more. If you would like to purchase our products, please contact us.

Single mode and Multimode Fiber Optic Patch Cord

Fiber Optic Patch Cable is also known as optical fiber jumper or optical patch cord. It is composed of a fiber optic cable terminated with different connectors on the ends. There are two major application areas of fiber optic patch cords which are computer work station to outlet and fiber optic patch panels or optical cross connect distribution center. Single mode fiber patch cables are primarily used for applications involving long distance, while multimode patch cables are the choice for most common local fiber systems because the devices for multimode are far cheaper.

Single mode fiber patch cables have a small core and only one pathway of light. With only a single wavelength of light passing through its core, single mode realigns the light toward the center of the core instead of simply bouncing it off the edge of the core as with multimode. Single more is typically used in long-haul network connections spread out over extended areas-longer than a few miles. For example, telcos use it for connections between switching offices. Single mode cable features a 9-micron glass core.

Multimode fiber patch cords have a large-diameter core that is much larger than the wavelength of light transmitted, and therefore has multiple pathways of light-several wavelengths of light are used in the fiber core. Multimode fiber patch cord can be used for most general fiber applications. Use multimode fiber for bringing fiber to the desktop, for adding segments to your existing network, or in smaller applications such as alarm systems. Multimode cable comes with two different core sizes: 50 micron or 62.5 micron.

Simplex fiber patch cable consists of a single fiber, and is used in applications that only require one-way data transfer. For instance, an interstate trucking scale that sends the weight of the truck to a monitoring station or an oil line monitor that sends data about oil flow to a central location. Simplex fiber is available in single mode and multimode.

Duplex fiber optic patch cord cable consists of two fibers, usually in a zip cord (side-by-side) style. Use duplex multimode or single mode fiber optic cable for applications that require simultaneous, bi-directional data transfer. Workstations, fiber switches and servers, fiber modems, and similar hardware require duplex cable. Duplex fiber is available in single mode and multimode.

Applications of optical patch cord:

FTTH application
Premise installations
Data processing networks
Wide Area Networks (WANs)
Telecommunication networks
Industrial, mechanical and military


. Fiber optic connector type: LC, FC, SC, ST, MU, MTRJ, E2000
. Ferrule Interface type: PC, UPC, APC
. Fiber cores: Simplex, duplex, 4 fibers, 8 fibers etc.
. Fiber type; Single mode (G.652, G655), multimode(50/125)/(62.5/125)
. 100% Insertion Return Loss, End Face and Interference inspection
. Low insertion loss, high return loss
. Excellent mechanical endurance
. Good in repeatability and exchangeability
. Insertion loss: <0.5 dB
. Operation temperature: -20° to 85°C
. 10G OM3 OM4 fiber cable available
. Various jacket material, PVC and LSZH

FiberStore fiber jumpers are manufactured strictly according to international standard. We adopt high quality raw materials and we use on-site manufacturing equipment. Our skilled workers and quality control department work closely together to guarantee that every piece of our fiber optic patch cord is excellent quality and looking. Our fiber patch cables are fully compliant with international standards and are with very good quality and competitive prices.

SC Fiber Optic Pigtail

We supply fiber optic pigtails, including the single mode and multimode types, These fiber pigtails are with premium grade connectors and with with typical 0.9 mm outer diameter cables. Simplex fiber pigtail and duplex fiber pigtails are available, with different cable color, cable diameter and jacket types optional.

The most common is know as the fusion splice on pigtail, and the 12 fiber or 6 fiber multi color pigtails are easy to install and provide a premium quality fiber optic connection. The fiber optic pigtail connectors are compliant to IEC, TIA/EIA, NTT and JIS specifications. It is with one piece construction and pulls proof design. Low cost but high performance, which makes it one of the most popular cables. FiberStore supply the single mode 9/125, multimode 50/125, multimode 10Gb 50/125 and multimode 62.5/125 types fiber optic pigtail cables. They are with various PC, UPC, and APC connectors respectively. Our fiber pigtails are available in simplex or duplex versions, with custom design available.

FiberStore SC pigtail, with very competitive prices. We offer 3 primary fiber versions including the 9/125um single mode, 62.5/125 multimode and 50um OM3 10Gb types, These fiber pigtails are with premium grade SC connectors and with typical 0.9mm outer diameter cables. Simplex fiber pigtail and duplex fiber pigtails are available, with different cable color, cable diameter and jacket types optional.


. Superior qualified standard PC, APC, UPC, SPC polishing;
. 100% optic test: Insertion Loss: ≤0.3 (PC); ≤0.2 (APC); ≤0.2 (UPC); ≤0.3 (SPC);
. 100% optic test: Return Loss: ≥45 (PC); ≥60 (APC); ≥55 (UPC); ≥50 (SPC);
. φ0.9mm, φ2.0mm, φ3.0mm cable optional;
. Single mode (9/125) or multi mode (50/125 or 62.5/125) fiber available;
. FC, SC, LC, MU, ST, MT-RJ, etc connector options
. Simplex and duplex connector available; 8) Good exchange ability and good durability;
. Available in fiber bunch, ribbon fan-out, pigtail available;
. Meets ISO9001, ROHS and Bell core GR 326-core standards;
. Customized specifications are welcomed.


. CATV, metro test equipment;
. Telecommunication networks;
. Local area networks (LAN);
. Wide area networks (WAN);
. Premise installations;
6) Data processing networks;
7) Video and military active device termination.

FiberStore also provide a range of fiber jumpers, such as single mode fiber patch cables, MTP MPO cable and more, if you want to know more about fiber patch cords types, please contact us or visit our website.