Effects of bandpass bandwidth in bit-rate and distance of subcarrier multiplexing on multimode fiber

Transmitting a high data rate signal (> 1 Gbps) over multimode fiber can be done successfully if the high frequency range of multimode fiber is utilized. With this high frequency range, the available data rate can be increased significantly comparing to the achievable rate from the 3-dB intermodal bandwidth. However, there two major problems of transmitting signals over this high frequency of multimode fiber; that is, the attenuation and the deep nulls in its frequency response. To successfully exploiting this frequency range for transmitting a high data rate signal, subcarrier multiplexing with an error-correcting technique has to be used. In this paper, the effects of bandpass bandwidth are considered. It is found that as the bandpass bandwidth increases, the maximum data rate is increased but the maximum distance is reduced. The data rate-distance product of 2 Gbps-km can be obtained. The results can be used as a guideline for signal transmission over high frequency range of multimode fiber.