Certified Fiber Optics Practice Exam

Standard core diameters of multimode fiber are typically:

1. 40 nm, 50 nm

2. 50 nm, 62.5 nm

3. 60 nm, 75 nm

4. 50 um, 62.5 um

The correct answer is: 50 um, 62.5 um

The standard core diameters of multimode fiber are typically 50 micrometers (um) and 62.5 micrometers (um). These dimensions are standard in the fiber optics industry for multimode fibers, allowing them to efficiently transmit multiple light modes or paths through the core. The choice of 50 um as a core diameter enables improved bandwidth capabilities, making it suitable for high-performance data transmission. Meanwhile, the 62.5 um core has historically been prevalent in many network installations, particularly in older systems, and is complemented by the heavier light-gathering capacity that assists in maintaining signal integrity over longer distances. Both of these sizes correspond to the requirements for the design and optical performance of multimode fiber, which is significant in applications such as local area networks and other short-distance communications. Other options listed do not represent standard measurements used in multimode fibers, as nanometer measurements are not applicable in this context and do not align with established fiber specifications.