In this study, a novel approach is proposed to generate and transmit the ultra-wideband linear frequency modulation (LFM) signal using frequency-sweeping lasers. In this approach, the frequency-sweeping continuous-wave light from frequency-sweeping lasers is introduced into the Mach-Zehnder modulator to generate a carrier-suppression double sideband (CS-DSB) signal. The Sagnac loop containing a fiber Bragg grating is used to separate the CS-DSB signal. Beat occurs in the reflected light of the Sagnac loop and the transmitted light after some delay; hence, the ultra-wideband LFM signal is generated. The simulation results denote the generation of the ultra-wideband continuous and pulse LFM signals with carrier frequency of 30 GHz, bandwidth of 16 GHz, and time-bandwidth product of 8000. The proposed approach solves the problem of power periodic fading observed when the ultra-wideband LFM signal is transmitted through an optical fiber in case of antenna stretching. Furthermore, using the proposed approach, the carrier frequency, time duration, chirp rate, and chirp sign can be independently tuned, providing an effective strategy for generating and transmitting the ultra-wideband LFM signal.