Influence of transmitter chirp and receiver imperfections on RF gain in short-range ROMMF systems

Two important effects that can lead to extensive detrimental effects in short-range radio-over-multimode-fiber systems are presented. The theoretical and experimental work shows transmitter chirp and receiver imperfections determining the degree of both RF gain variations as well as optical power variations

Link design rules for cost-effective short-range radio over multimode fiber systems

Referring to short-range radio over multimode fiber links, we find out important guidelines for the realization of cost-effective intensity modulated directly detected systems. Since the quality of today's connectors is considerably higher than in the past, we demonstrate that two important parameters of the system are the finite detecting area of the photodiode and the laser frequency chirp. Furthemore, we show that the use of the central launch technique inherently determines a lower impact of modal noise fluctuations with respect to the offset launch one. This makes CL more convenient for short-range applications, where the transmittable bandwidth does not constitute the main limitation

In-Building Wireless Distribution in legacy Multimode Fiber with an improved RoMMF system

A radio over multimode fiber (RoMMF) system for in-building wireless distribution employing a directly modulated Fabry-Perot (FP) transmitter and the central launch technique is presented. The worst-case spurious free dynamic range (SFDR) exceeds 105 dB×Hz2/3 up to 525 m of OM2 multimode fiber (MMF). Experimental and theoretical results are reported showing that this scheme outperforms a RoMMF system employing a distributed feed-back (DFB) laser diode (LD) and/or a mode scrambler to achieve overfilled launch (OFL). Long Term Evolution (LTE) signal transmission is achieved with high quality in terms of Adjacent Channel Leakage Ratio (ACLR) and Error Vector Magnitude (EVM)