60-GHz Ultra-WideBand Radio-Over-Fiber System employing SCM/WDM

Abstract

We firstly propose a 60-GHz Ultra-WideBand (UWB) Radio-Over-Fiber (ROF) System employing Subcarrier Multiplexing/Dense Wavelength Division Multiplexing (SCM/DWDM) to extend the coverage and improve high channel efficiency for UWB communication systems. SCM/DWDM is first utilized to the UWB-ROF system, due to the better channel efficiency with narrower channel spacing of the DWDM and the unique commonality of the simple SCM, achieving the large bit rate and high-mobility requirements for the 60 GHz. The novel Optical Frequency Multiplication (OFM) Modulation (Frequency Quadrupler) of 15 GHz lower RF is more cost-effective with much lower RF requirement and dispersion-tolerant even up to a 50 km optical transmission distance in the standard SingleMode Fiber (SMF), compared with Optical Double-Sideband (DSB) Modulation of 30 GHz higher RF. Moreover, we also investigate the novel Punctured Convolutional coding for the system, indicating a trade-off between throughput and Bit Error Ratio (BER). The maximum 1120 Mbits/s throughput per band can be achieved at the expense of 6 dB Eb/No penalty, in contrast to the maximum 480 Mbits/s per band of the current standard Orthogonal-Frequency-Division Multiplexing (OFDM)-UWB (WiMedia specification v1.2). This study provides a potential solution for the modulation and coding designs of a practical UWB-ROF system.