What is the restricted mode launch (RML) bandwidth of an OM4 multimode fiber at 850 nm?

The restricted mode launch (RML) bandwidth of an OM4 multimode fiber at 850 nm is indeed 4700 MHz-km. This value represents the maximum bandwidth that can be achieved using the RML technique, which is particularly relevant for high-speed data transmission over multimode fibers.

OM4 fibers are designed to support high-speed applications, including 40 Gb/s and 100 Gb/s Ethernet, and they have improved specifications compared to previous multimode fiber types. The RML bandwidth is significant because it indicates how well the fiber can handle high-frequency signals while minimizing modal dispersion, which is critical for maintaining signal integrity over longer distances.

In summary, the 4700 MHz-km value reflects the performance capabilities of OM4 fibers, making them suitable for modern data center applications where high bandwidth and low modal dispersion are essential for efficient operation.