Ultrawideband (UWB) impulse radio is regarded as a promising technology in recent years owing to the distinct advantages of high data-rate, high immunity to multipath fading, wide bandwidth, lower power consumption. To overcome the UWB short-range wireless transmission limitation, UWB-over-fiber technology has emerged to increase the propagation distance of wireless signal, which has potential application in future wideband personal access networks. Therefore, photonic operation and modulation of UWB signals is extraordinarily attractive since it can be directly incorporated into the fiber link and eventually radiate at the receiver front-end.
Prof. Sun Junqiang and Ph. D Shao Jing of WNLO have proposed and experimentally demonstrated a simple and flexible technique for UWB monocycle and doublet pulse generation and pulse shape modulation (PSM), pulse position modulation (PPM) and on-off keying (OOK) modulation. Since neither the dispersion compensation nor the optical amplification is employed, UWB signals traveling through 75 km optical fiber. It has the ability to propagate the UWB signals through a length of 75 km fiber without dispersion compensation and optical amplification.
This work is supported by the National Natural Science Foundation of China under Grant No. 60977044, and published on Optics Letters, Vol. 37, No. 16, pp. 3471-3473, 15 August, 2012.
Fig. 1. UWB pulse generation and modulation configuration
Fig. 2. Waveforms of the PSM UWB signal after transmission in an optical fiber of different lengths.