Tag Archives: Simplex Fiber Optic Patch Cord

Selecting Right Fiber Optic Patch Cables

There are various fiber optic patch cables for different applications. Fiber optic jumper cables are available in OS1, OS2 single-mode types and OM1, OM2, OM3, OM4 multimode types. Fiber optic jumper cables are terminated on both ends with a high performance hybrid or single type fiber optic connector, such as SC, ST, FC, LC, MTRJ, or E2000 connector in simplex or duplex. How to choose right fiber optic patch cables for your networks? Here are 6 factors that you need to take into consideration.

Connector Type

A fiber optic patch cable is terminated on both ends with a fiber optic connector, such as LC connector, SC connector, ST connector, FC connector, or MPO/MTP connector. Different connectors are used to plug into different devices. If ports of devices in the both ends are the same, we can use fiber optic patch cables with the same type of connectors on both ends, such as LC LC cables, SC SC fiber patch cord, ST ST fiber patch cable, or MPO-MPO patch cables. If you want to connect different ports type devices, fiber optic patch cables with different types of connectors on both ends, like LC SC fiber patch cable, LC to ST fiber patch cable, or SC to ST fiber cable, may suit you.

LC-SC-ST-FC-MPO-MTP-fiber-optic-patcah-cable

Connector Polish Type

Other than choosing the right connector type, you also need to choose the right connector polish type, whether the same polish type of the same connector type or different polish types of different connector types on both ends, such as SC APC fiber patch cord, SC/APC to LC patch cable. The loss of APC connectors is lower than UPC connectors. Usually, the optical performance of APC connectors is better than UPC connectors. APC connectors are widely used in applications such as FTTx, passive optical network (PON) and wavelength-division multiplexing (WDM) that are more sensitive to return loss. But APC connector is usually more expensive than UPC connector. With those applications that call for high precision optical fiber signaling, APC should be the first consideration, but less sensitive digital systems will perform equally well using UPC.

Single-mode or Multimode?

Fiber optic patch cable has two propagation modes: multi-mode and single-mode. Single-mode fiber patch cord uses 9/125um glass fiber. It is designed for the transmission of a single ray or mode of light as a carrier and is used for long-distance signal transmission. Multimode fiber patch cord usually uses 50/125um or 62.5/125um glass fiber. It can carry multiple light rays or modes, each at a slightly different reflection angle within the optical fiber core. Multimode fiber optic patch cables is used for relatively short distances because the modes tend to disperse over longer lengths. Typical single-mode fiber optic patch cable used yellow fiber cable and multi mode fiber optic patch cable used orange or aqua fiber cable.

single-mode-multimode-fiber-optic-patch-cable

Simplex or Duplex?

Do you need simplex or duplex fiber optic patch cords? There is only one single strand of glass or plastic fiber in a simplex fiber optic patch cord. It is often used where only a single transmit and/or receive line is required between devices. A simplex fiber optic patch cord has only one fiber optic connector at each end, often used for Bidirectional (BiDi) fiber optic transceivers. A duplex fiber patch cord consists of two strands of glass or plastic fiber which are typically found in a tight-buffered and jacketed “zipcord” construction format. The duplex fiber is most often used for duplex communication between devices where a simultaneous and separate transmit and receive are required. Duplex fiber patch cords are used for common transceivers. Simplex and duplex fiber patch cords both are available in single mode and multi-mode.

simplex-duplex-fiber-optic-patch-cable

Cable Jacket

Usually, there are three types of cable jacket: Polyvinyl Chloride (PVC), Low Smoke Zero Halogen (LSZH) and Optical Fiber Nonconductive Plenum (OFNP). You can see there features in figure below and choose the right one for your network.

PVC-LSZH-OFNP-Fiber-Optic-Patch-Cable

Besides those three cable jacket types above, there is another common cable, armored cable. The double tubing and steel sleeve construction make these patch cables completely light tight, even when they are bent. These cables can withstand high crushing pressures, which makes them suitable for running along floors and other areas where they may be stepped on. The tubing also provides excellent cutting resistance, abrasion resistance, and high tensile strength.

Armored-Fiber-Optic-Patch-Cable

Cable Length

Fiber optic jumper cables are made in different lengths, usually from 0.5m to 50m. You can choose an appropriate cable length according to the distance between the devices you want to connect.

Conclusion

When choosing a right fiber optic patch cord, you need to consider all these six factors carefully. Single-mode or multimode, simplex or duplex, APC or UPC connector polish type, which one is right for your networks? Which kind of fiber optic connector do you need, SC, ST, FC, LC, MTRJ, or E2000 connector? By figuring out what you need exactly and consider all these six factors, you can make appropriate choices for your applications.

What Are Simplex and Duplex Fiber Optic Patch Cords?

Fiber optic patch cord, also known as fiber optic patch cable or fiber jumper, is a fiber optic cable terminated with fiber optic connectors on its both ends. According to fiber cable structures, fiber optic patch cords can be divided into simplex and duplex fiber jumpers. What are simplex and duplex fiber optic patch cords? And what are their differences? This post will give answers to these two questions.

Simplex Fiber Optic Patch Cord

Simplex fiber patch cord has one fiber and one connector on each end. Both single mode and multi-mode simplex optic patch cords have only one single strand of fiber. The core of a single mode simplex optic patch cord is 8 to 10 microns. Light travels toward the center of the core in a single wavelength in single mode patch cables. The core of a multi-mode simplex optic patch cord is either 50 or 62.5 microns. The core of the latter gathers more light compared to the former, and allows more signals to be transmitted.

Duplex Fiber Optic Patch Cord

Duplex fiber optic patch cable has two fibers and two connectors on each end. There are single mode and multi-mode duplex optic patch cords. A single mode duplex optic patch cord is constructed of two identical strands of single mode fiber. A multi-mode duplex optic patch cord is constructed of two identical strands of multi-mode fiber. For example, a duplex 9/125 single mode fiber patch cable has two strands of 9/125 micron single mode fiber, featuring a 9µm core and 125µm cladding; a duplex 62.5/125 multi-mode fiber patch cable has two strands of 62.5/125 micron multi-mode fiber, featuring a 62.5µm core and 125µm cladding. One fiber transmits data in one direction and the other one transmits data in the reverse direction. Each fiber is marked “A” or “B” or different colored connector boots are used to mark polarity. Every connector can only be connected to the corresponding port, same as the simplex situation. The following picture shows simplex and duplex fiber optic patch cords.

Simplex & Duplex Fiber Patch Cable

What Are Their Differences?

Simplex and duplex fiber patch cords have their respective features and applications. There is only one single strand of glass or plastic fiber in a simplex fiber patch cord. Simplex optic patch cords can be used for applications that only require one-way data transfer. It is just like that water only flows in one direction—downwards. So one end of a simplex fiber patch cord is a fixed transmission end, and the other is a fixed receiving end. A duplex fiber patch cord consists of two strands of glass or plastic fiber which are typically found in a tight-buffered and jacketed “zipcord” construction format. The duplex fiber is most often used for duplex communication between devices where a simultaneous and bi-directional transmit and receive are required, such as backbone ports, workstations, Ethernet switches, fiber switches and servers.

Other than simplex and duplex, with different connectors or cable constructions, there can also be different categories of fiber optic patch cords, like LC-LC fiber patch cord, or ST-LC fiber patch cable. These fiber patch cables can be with custom length. If you want to choose a fiber optic patch cord, you need to take all these things into consideration, simplex or duplex, single mode or multi-mode, connectors, etc.