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Fiber optic cables
use a completely different and faster method of transmitting data than copper wires. Data is sent through the cable using light pulses that travel through the fiber. The cable is typically made up of plastic or glass so that light can penetrate it. The light signals then shoot directly through the cable, hitting the cable walls. The angle of the pulse can be no more than 42° or it will lose its signal power. Light travels at a very fast speed, thus fiber optic cables have a much higher speed than copper or traditional cables.

There are many types of fiber optic cable assemblies. Selecting the appropriate one depends on the end connector and application.

The three main cables are single-mode fibers, multi-mode fibers, and plastic optical fibers.


  • Single Mode FiberA cable that has only one strand of glass fiber running through it. Its thickness can range from 8.3 – 10 microns in diameter.

    Single-mode fibers can only transmit data in one direction, however, these cables have higher bandwidth and therefore cost more.

multimode 1

  • Multi-Mode FibersThese cables have multiple strands of glass fiber with larger diameters, ranging from 50 to 100 microns. The multiple strands can follow a linear or non-linear path.Although this type has higher bandwidth due to its thickness, its limiting factor is length. As the cable gets longer, the signal becomes distorted.
  • Plastic Optical FiberThis type of cable uses plastic instead of glass fibers. These are a good option if you want a cheaper option for a short-distance application. Plastic optic fibers can lose their signal over long distances.

Plastic Optical Fiber

The connectors used at the ends of fiber optic assemblies are very important in making sure the cable is secured and connected properly to the given application.

Fortunately, Circuit Assembly offers all major types of cable assemblies with appropriate connectors, such as FC, LC, SC, and ST.

  • FC / Fixed Connectors – These connectors are intended to be fixed on an application via a screw and threaded end housing. Its main purpose is to secure the cable assembly to applications with movement.
  • LC / Lucent Connector – These contain small ferrules (ring or cap) and a push pull latching mechanism. These connectors are most popular with single-mode fiber.
  • SC / Subscriber Connector – These have a ceramic ferrule and are used for push pull application with dual fiber.
  • ST / Straight Tip connectors – These contain a unique design where a half-twist bayonet locking mechanism is used. These come equipped with a longer ferrule. These connectors are primarily used with multi-mode fiber assemblies.

Circuit Assembly Corp is happy to offer all major fiber assemblies! We produce all of our technical manufacturing with the highest quality and support.

Contact our field applications engineering team and let’s customize your optics today!