Introduction to Single Mode Patch Cords

Optical devices of different types are connected with fiber patch cords. A fiber optic patch cord is an optical cable, capped at either end with connectors and used to connect one optical device to another for signal routing. The core of all fiber patch cables carries light to transmit data. By different sizes of cores, fiber optic patch cables can be classified into single mode and multi-mode. Single mode fiber optic patch cables have a core of 8 to 10 microns. Multi-mode fiber optic patch cables have a core of either 50 or 62.5 microns.

Single mode fiber patch cable has a small diametral core that allows only one mode of light to propagate, that is to say, light travels toward the center of the core in a single wavelength, which decreases the number of light reflections created as the light passes through the core, lowers attenuation and improves the ability for the signal to travel fast and over long distances. So they are usually used for connections over large areas, such as college campuses or cable television networks.

There are many types of single mode fiber patch cords according to different strands of fibers, connector types and connector’s inserted core covers.

By different modes of channel operation, there are two kinds of single mode fiber patch cords, simplex and duplex. A single mode simplex fiber patch cable consists of a single strand of glass. It is often used where only a single transmit and/or receive line is required between devices or when a bi-directional communication is made over a single fiber. A single mode duplex fiber patch cable consists of two strands of glass, and is typically found in a “zipcord” construction format which is tight-buffered and jacketed. This patch cable is most often used for duplex communication between devices where a simultaneous and separate transmit and receive are required.

Single mode fiber patch cords have different connector types on each end to accommodate interconnection of devices with dissimilar connectors. So they can also be classified by the connectors on either end of the cable. Some of the most common connectors include LC, FC, SC, ST, etc. An LC single mode patch cord is an optical cable connected at each end with an LC connector; an LC-SC single mode patch cord is an optical cable connected with an LC connector at one end and an SC connector at the other end. With different connectors, single mode fiber patch cables can be connected with various telecommunication equipment.

Besides, connector’s inserted core cover has APC, UPC, or PC configuration. PC polish, the fiber ends are typically polished with a slight curvature, so the connectors are mated with the fibers touch only at their cores. This is known as a “physical contact” (PC) polish. The term APC stands for angled physical contact and UPC stands for ultra physical contact. A UPC single mode fiber patch cable results in a dome-shaped end-face that aids in optimizing the connections between two jacketed fibers. An APC single mode fiber patch cable is polished at an eight degree angle, which reduces the amount of light reflected between the two connected fibers.

Fiberstore offers a huge selection of single mode patch cords for multiple applications. These fiber patch cables can be with custom length, custom made cable jacket and different standards like LSZH, Riser and Plenum. And they can be available in simplex and duplex with FC, SC, ST, FC, MTRJ, E2000 and MU fiber optic connectors. You can choose the most appropriate one from us.