中国激光, 2012, 39 (8): 0805007, 网络出版: 2012-07-17
Design of mm-RoF system based on OFM technique with optimized OFDM modulation
Design of mm-RoF system based on OFM technique with optimized OFDM modulation
摘要
Abstract
We present the design of a novel bi-directional millimeter-wave radio-over-fiber (mm-RoF) system based on the millimeter-wave generation by optical frequency multiplication (OFM). A dual-drive Mach-Zehnder modulator is used to generate high-order optical side-modes which beat in the photo-detector, producing a 40-GHz carrier. Over 100-Mb/s orthogonal frequency division multiplexing (OFDM) modulation scheme is employed. The emphasis is on developing a mathematical model for optimizing optical modulation index to the Mach-Zehnder intensity modulator (IM) for OFDM signal with high peak-to-average power ratio which imposes a limitation on the system bit error rate (BER) performance due to the non-linearity of IM. The theoretical analysis on composite carrier to composite triple beat ratio is performed based on which extension to the system BER formula for quadrature phase shift keying/ multiple quadrature amplitude modulation (QPSK/MQAM) format is presented. The experimental proof is given in a 40-GHz RoF system at a bit rate of up to 280 Mb/s in 100-MHz bandwidth.
, , , , , . Design of mm-RoF system based on OFM technique with optimized OFDM modulation[J]. 中国激光, 2012, 39(8): 0805007. Rujian Lin, Xiang Chen, Lin Zhang, Jiajun Ye, Yingxiong Song, and Yingchun. Design of mm-RoF system based on OFM technique with optimized OFDM modulation[J]. Chinese Journal of Lasers, 2012, 39(8): 0805007.