Insertion loss, also known as attenuation, is the loss of optical power that occurs when light passes through a fiber optic connector. It is caused by factors such as misalignment, air gaps, and imperfections in the connector components. Attenuation describes the continuous loss along the fiber. In the test report for a fiber cable, you may often see some data related to fiber insertion loss (IL) and return loss (RL), but do you know what insertion loss and return loss actually mean? How do the values of IL and RL impact the quality of the fiber cable? Are higher values better, or lower. Fiber loss, also called fiber optic attenuation or attenuation loss, refers to the loss of signal between input and output. In this comprehensive guide, we will discuss these two parameters, their significance in fiber optic connectors, and the recommended reference values for insertion loss and return. In a fiber optic link, light from a transmitter is coupled into a fiber in the cable plant and transmitted to a receiver on the other end of the link. As the light travels down the fiber, its optical power is attenuated by the losses in the fiber (scattering and absorption) and losses at connectors. With our RP Fiber Power simulation software, you can simulate different types of fiber couplers, using numerical beam propagation. CSRAYZER's polarization-maintaining filter or fused coupler series products are used to split inputs from a polarization-maintaining optical fiber according to the.