Multimode step index fiber has a large core diameter of range is ___________a.100 to 300 μmb.100 to 300 nmc.200 to 500 nmd.200 to 500 μm

To answer the question about the core diameter range of multimode step index fiber, we need to analyze the options provided.

Analysis of Options

1. Option a: 100 to 300 μm - This range is within the typical core diameter for multimode fibers.
2. Option b: 100 to 300 nm - This range is too small for fiber optics, as optical fibers typically have core diameters in micrometers, not nanometers.
3. Option c: 200 to 500 nm - Similar to option b, this range is also too small for fiber optics.
4. Option d: 200 to 500 μm - This range is also a plausible size for multimode fibers.

Conclusion

The correct range for multimode step index fiber core diameters most appropriately aligns with option a or d. However, the most commonly accepted core diameters for multimode step index fibers typically fall between 100 to 300 μm.

Final Answer

The core diameter range for multimode step index fiber is a. 100 to 300 μm.