Linearity Improvement for Impulse Radar Ultra Wideband over Fiber

In this paper we present the linearization of Impulse Radar Ultra Wideband (IR-UWB) transmission system over fiber. The radio frequency signal of IR-UWB is transmitted over 50 km of the single mode fiber (SMF) using external Mach Zehnder Modulator (MZM), amplified, linearized and detected by PIN diode photo receiver. For improving the linearity and suppressing the four wave mixing (FWM) caused by semiconductor optical amplifier (SOA) and 50 km SMF, the system uses the feed forward technique. Link performance was evaluated for two IR-UWB signals to suppress the FWM. The theoretical simulation results demonstrate a distortion cancellation produce by SOA of better than 25 dB over 1550 nm single mode optical fiber cable. In addition this paper investigates the characteristic transmission of UWB pulse radio through 50 Km single mode Radio over Fiber (RoF) system such as BER measurements to evaluate the performance of the UWB with respect to different laser power output level.