What color is used to indicate singlemode fiber in premises cable jackets?

The color used to indicate singlemode fiber in premises cable jackets is yellow. This color coding is standardized to help technicians easily identify the type of fiber when working with different cable types. Singlemode fibers, which are designed to carry light directly down the fiber with minimal reflection, are distinguished from multimode fibers, which are typically indicated by orange jackets. The use of color coding enhances safety and efficiency during installation, maintenance, and troubleshooting of fiber optic networks, allowing technicians to quickly recognize fiber types at a glance.