Fiber optic technology has revolutionized the world of data transmission, providing faster, more reliable, and secure communication channels. Within the intricate network of fiber optics lies an essential element known as color coding, which plays a pivotal role in managing and identifying these optical fibers. In this blog post, we will delve into the different types of fiber optic color coding, shedding light on its significance and how it enables seamless data transfer across the globe.

  1. Single-mode Fibre Color Coding

Single-mode fiber (SMF) is primarily used for long-distance transmissions with a single light mode propagating through the core. The standard color coding for single-mode fibers follows the TIA-598-C standard, where the coating color corresponds to specific wavelength windows:

  • Yellow: This color designates single-mode fibers optimized for wavelengths around 1310 nm, widely used in local area networks (LANs) and metropolitan area networks (MANs).
  • Blue: Blue-colored single-mode fibers operate around 1550 nm, making them ideal for long-haul applications, such as inter-city and transcontinental data transmission.
  1. Multimode Fiber Color Coding

Multimode fiber (MMF) facilitates the transmission of multiple light modes through the core simultaneously, making it suitable for shorter distances. There are two primary types of multimode fiber color coding:

  • Orange: Multimode fibers optimized for 62.5-micron core diameter are typically orange in color. However, this type is less common today due to its limited bandwidth compared to modern options.
  • Aqua: Most modern multimode fibers feature a 50-micron core diameter and have an aqua-colored coating. These fibers offer higher bandwidth and are compatible with laser-based transmission systems, making them more prevalent in data centers and high-speed LANs.
  1. Fiber Connector Color Coding

In addition to color coding the fiber cables, fiber optic connectors also have specific color schemes to ensure proper alignment and prevent errors during installations and maintenance:

  • Blue: Connectors with a blue boot typically indicate an SC (Subscriber Connector) connector, commonly used in data centers and telecommunication applications.
  • Beige: ST (Straight Tip) connectors are recognizable by their beige or cream-colored boots. Although they were once popular, they are less common in modern installations.
  • Green: Green connectors usually represent LC (Lucent Connector) connectors, which are compact and commonly used in high-density environments such as data centers.
  • Black: Connectors with black boots are often associated with MPO (Multi-fibre Push-On) connectors, which support multiple fibres in a single interface and are commonly used in high-speed data transmission.


Fibre optic colour coding serves as a vital roadmap for network technicians and engineers, enabling them to identify and manage intricate optical networks with ease. Understanding the colour codes allows for efficient installations, maintenance, and troubleshooting, ensuring optimal performance and reliability of fibre optic communication systems.

As technology continues to advance, it is essential to stay up-to-date with industry standards and best practices, as fibre optic colour coding may evolve over time. By embracing the rainbow of fibre optic colour coding, we can continue to unlock the full potential of this transformative technology, connecting the world and propelling us into the future of seamless and lightning-fast communication.